<SEC-DOCUMENT>0001493152-22-006755.txt : 20220314
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<ACCEPTANCE-DATETIME>20220314161551
ACCESSION NUMBER:		0001493152-22-006755
CONFORMED SUBMISSION TYPE:	10-Q
PUBLIC DOCUMENT COUNT:		88
CONFORMED PERIOD OF REPORT:	20220131
FILED AS OF DATE:		20220314
DATE AS OF CHANGE:		20220314

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Ocean Power Technologies, Inc.
		CENTRAL INDEX KEY:			0001378140
		STANDARD INDUSTRIAL CLASSIFICATION:	ELECTRIC SERVICES [4911]
		IRS NUMBER:				222535818
		STATE OF INCORPORATION:			NJ
		FISCAL YEAR END:			0430

	FILING VALUES:
		FORM TYPE:		10-Q
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-33417
		FILM NUMBER:		22736765

	BUSINESS ADDRESS:	
		STREET 1:		28 ENGELHARD DRIVE
		STREET 2:		SUITE B
		CITY:			MONROE TOWNSHIP
		STATE:			NJ
		ZIP:			08831
		BUSINESS PHONE:		609-730-0400

	MAIL ADDRESS:	
		STREET 1:		28 ENGELHARD DRIVE
		STREET 2:		SUITE B
		CITY:			MONROE TOWNSHIP
		STATE:			NJ
		ZIP:			08831

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Ocean Power Technologies, INc.
		DATE OF NAME CHANGE:	20061012
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"></p>

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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 18pt"><b>UNITED
STATES</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 18pt"><b>SECURITIES
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 12pt"><b>Washington,
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(Mark
One)</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<table cellspacing="0" cellpadding="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <tr style="font: 10pt Times New Roman, Times, Serif">
    <td style="font: 10pt Times New Roman, Times, Serif; vertical-align: top; width: 0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_90B_edei--DocumentQuarterlyReport_c20210501__20220131_zEyGlkUivf95"><ix:nonNumeric contextRef="From2021-05-01to2022-01-31" format="ixt:booleantrue" name="dei:DocumentQuarterlyReport">&#9746;</ix:nonNumeric></span></span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>QUARTERLY
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  </table>
<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>&#160;</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>For
the Quarterly Period Ended <span id="xdx_909_edei--DocumentPeriodEndDate_c20210501__20220131_zjqDpIvXBqe8"><ix:nonNumeric contextRef="From2021-05-01to2022-01-31" format="ixt:datemonthdayyearen" name="dei:DocumentPeriodEndDate">January 31, <span id="xdx_907_edei--DocumentFiscalYearFocus_c20210501__20220131_zWMHXc4qYGR5"><ix:nonNumeric contextRef="From2021-05-01to2022-01-31" name="dei:DocumentFiscalYearFocus">2022</ix:nonNumeric></span></ix:nonNumeric></span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Or</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>&#160;</b></span></p>

<table cellspacing="0" cellpadding="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <tr style="font: 10pt Times New Roman, Times, Serif">
    <td style="font: 10pt Times New Roman, Times, Serif; vertical-align: top; width: 0.25in; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_90E_edei--DocumentTransitionReport_c20210501__20220131_zLsWfc0qdY1i"><ix:nonNumeric contextRef="From2021-05-01to2022-01-31" format="ixt:booleanfalse" name="dei:DocumentTransitionReport">&#9744;</ix:nonNumeric></span></span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>TRANSITION
    REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934</b></span></td></tr>
  </table>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>
<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>For
the Transition Period From ______to______</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Commission
file number: <span id="xdx_907_edei--EntityFileNumber_c20210501__20220131_zXW1UiRA8h5l"><ix:nonNumeric contextRef="From2021-05-01to2022-01-31" name="dei:EntityFileNumber">001-33417</ix:nonNumeric></span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 18pt"><b><span id="xdx_90D_edei--EntityRegistrantName_c20210501__20220131_zglDR2LWqwa8"><ix:nonNumeric contextRef="From2021-05-01to2022-01-31" name="dei:EntityRegistrantName">OCEAN
POWER TECHNOLOGIES, INC.</ix:nonNumeric></span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>(Exact
Name of Registrant as Specified in Its Charter)</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>&#160;</i></span></p>

<table cellspacing="0" cellpadding="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 49%; padding-right: 2.65pt; padding-left: 2.65pt; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><span id="xdx_900_edei--EntityIncorporationStateCountryCode_c20210501__20220131_zmhCH4XeCpk"><ix:nonNumeric contextRef="From2021-05-01to2022-01-31" format="ixt-sec:stateprovnameen" name="dei:EntityIncorporationStateCountryCode">Delaware</ix:nonNumeric></span></b></span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 2%; padding-right: 2.65pt; padding-left: 2.65pt; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 49%; padding-right: 2.65pt; padding-left: 2.65pt; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><span id="xdx_908_edei--EntityTaxIdentificationNumber_c20210501__20220131_zim6aWQ9Hblc"><ix:nonNumeric contextRef="From2021-05-01to2022-01-31" name="dei:EntityTaxIdentificationNumber">22-2535818</ix:nonNumeric></span></b></span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif; padding-right: 2.65pt; padding-left: 2.65pt"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>(State
    or Other Jurisdiction</i></span></p>
    <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>of
    Incorporation or Organization)</i></span></p></td>
    <td style="font: 10pt Times New Roman, Times, Serif; padding-right: 2.65pt; padding-left: 2.65pt; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; padding-right: 2.65pt; padding-left: 2.65pt"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>(I.R.S.
    Employer</i></span></p>
    <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Identification
    No.)</i></span></p></td></tr>
  </table>
<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>&#160;</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><span id="xdx_901_edei--EntityAddressAddressLine1_c20210501__20220131_zxALTL5Kb7Rd"><ix:nonNumeric contextRef="From2021-05-01to2022-01-31" name="dei:EntityAddressAddressLine1">28
ENGELHARD DRIVE</ix:nonNumeric></span>, <span id="xdx_908_edei--EntityAddressAddressLine2_c20210501__20220131_zOHepa6RmFql"><ix:nonNumeric contextRef="From2021-05-01to2022-01-31" name="dei:EntityAddressAddressLine2">SUITE B</ix:nonNumeric></span>, <span id="xdx_90E_edei--EntityAddressCityOrTown_c20210501__20220131_zalGE3WXdpra"><ix:nonNumeric contextRef="From2021-05-01to2022-01-31" name="dei:EntityAddressCityOrTown">MONROE TOWNSHIP</ix:nonNumeric></span>, <span id="xdx_905_edei--EntityAddressStateOrProvince_c20210501__20220131_zFXhWg6kn7Fd"><ix:nonNumeric contextRef="From2021-05-01to2022-01-31" name="dei:EntityAddressStateOrProvince">NJ</ix:nonNumeric></span> <span id="xdx_90D_edei--EntityAddressPostalZipCode_c20210501__20220131_zrjsLy86Lwoh"><ix:nonNumeric contextRef="From2021-05-01to2022-01-31" name="dei:EntityAddressPostalZipCode">08831</ix:nonNumeric></span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>(Address
of Principal Executive Offices, Including Zip Code)</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>&#160;</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><span id="xdx_90C_edei--CityAreaCode_c20210501__20220131_zc65NgveMRel"><ix:nonNumeric contextRef="From2021-05-01to2022-01-31" name="dei:CityAreaCode">(609)</ix:nonNumeric></span>
<span id="xdx_90F_edei--LocalPhoneNumber_c20210501__20220131_zYUGoeHXGCMg"><ix:nonNumeric contextRef="From2021-05-01to2022-01-31" name="dei:LocalPhoneNumber">730-0400</ix:nonNumeric></span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>(Registrant&#8217;s
Telephone Number, Including Area Code)</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Securities
registered pursuant to Section 12(b) of the Act:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<table cellspacing="0" cellpadding="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="border-bottom: black 1pt solid; font: 10pt Times New Roman, Times, Serif; width: 30%; padding-right: 2.65pt; padding-left: 2.65pt; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Title
    of each class</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 2%; padding-right: 2.65pt; padding-left: 2.65pt; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: black 1pt solid; font: 10pt Times New Roman, Times, Serif; width: 28%; padding-right: 2.65pt; padding-left: 2.65pt; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Trading
    Symbol(s)</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 2%; padding-right: 2.65pt; padding-left: 2.65pt; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: black 1pt solid; font: 10pt Times New Roman, Times, Serif; width: 38%; padding-right: 2.65pt; padding-left: 2.65pt; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Name
    of each exchange on which registered</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif; padding-right: 2.65pt; padding-left: 2.65pt; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_905_edei--Security12bTitle_c20210501__20220131_zHde2GdG7ibb"><ix:nonNumeric contextRef="From2021-05-01to2022-01-31" name="dei:Security12bTitle">Common
    Stock $0.001 par value</ix:nonNumeric></span></span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; padding-right: 2.65pt; padding-left: 2.65pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; padding-right: 2.65pt; padding-left: 2.65pt; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_909_edei--TradingSymbol_c20210501__20220131_zA7T6gSXkv0l"><ix:nonNumeric contextRef="From2021-05-01to2022-01-31" name="dei:TradingSymbol">OPTT</ix:nonNumeric></span></span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; padding-right: 2.65pt; padding-left: 2.65pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; padding-right: 2.65pt; padding-left: 2.65pt; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_90B_edei--SecurityExchangeName_c20210501__20220131_zdvkANknXGF6" title="Security Exchange Name"><ix:nonNumeric contextRef="From2021-05-01to2022-01-31" format="ixt-sec:exchnameen" name="dei:SecurityExchangeName">NYSE</ix:nonNumeric></span>
    American</span></td></tr>
  </table>
<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Indicate
by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange
Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2)
has been subject to such filing requirements for the past 90 days. <span id="xdx_901_edei--EntityCurrentReportingStatus_c20210501__20220131_zrSuceKLJAf1"><ix:nonNumeric contextRef="From2021-05-01to2022-01-31" name="dei:EntityCurrentReportingStatus">Yes</ix:nonNumeric></span> &#9746; No &#9744;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; text-align: justify; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Indicate
by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule
405 of Regulation S-T (&#167;232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant
was required to submit such files). <span id="xdx_906_edei--EntityInteractiveDataCurrent_c20210501__20220131_zs81OmkQ1jh5"><ix:nonNumeric contextRef="From2021-05-01to2022-01-31" name="dei:EntityInteractiveDataCurrent">Yes</ix:nonNumeric></span> &#9746; No &#9744;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Indicate
by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting
company or an emerging growth company. See the definitions of &#8220;large accelerated filer,&#8221; &#8220;accelerated filer,&#8221;
&#8220;smaller reporting company&#8221; and &#8220;emerging growth company&#8221; in Rule 12b-2 of the Exchange Act. (Check one):</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<table cellspacing="0" cellpadding="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 25%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Large
    accelerated filer &#9744;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 22%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Accelerated
    filer &#9744;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 22%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_90E_edei--EntityFilerCategory_c20210501__20220131_zEg4VNtv38e9" title="Entity Filer Category"><ix:nonNumeric contextRef="From2021-05-01to2022-01-31" format="ixt-sec:entityfilercategoryen" name="dei:EntityFilerCategory">Non-accelerated
    filer</ix:nonNumeric></span> &#9744;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 25%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Smaller
    reporting company <span id="xdx_90C_edei--EntitySmallBusiness_c20210501__20220131_ziXQNQNftNN4"><ix:nonNumeric contextRef="From2021-05-01to2022-01-31" format="ixt:booleantrue" name="dei:EntitySmallBusiness">&#9746;</ix:nonNumeric></span></span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Emerging
    growth company <span id="xdx_90A_edei--EntityEmergingGrowthCompany_c20210501__20220131_zrDomsYnHBRf"><ix:nonNumeric contextRef="From2021-05-01to2022-01-31" format="ixt:booleanfalse" name="dei:EntityEmergingGrowthCompany">&#9744;</ix:nonNumeric></span></span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  </table>
<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Indicate
by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes <span>&#9744;</span> <span id="xdx_903_edei--EntityShellCompany_c20210501__20220131_zqukCBuNM7Uk"><ix:nonNumeric contextRef="From2021-05-01to2022-01-31" format="ixt:booleanfalse" name="dei:EntityShellCompany">No</ix:nonNumeric></span> &#9746;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">If
an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying
with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. &#9744;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">As
of March 14, 2022, the number of outstanding shares of common stock of the registrant was <span id="xdx_90B_edei--EntityCommonStockSharesOutstanding_iI_pid_c20220314_zzLBDC2SQqQ7" title="Entity Common Stock, Shares Outstanding"><ix:nonFraction name="dei:EntityCommonStockSharesOutstanding" contextRef="AsOf2022-03-14" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">55,894,213</ix:nonFraction></span>.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"></span></p>

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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>


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    <div style="break-before: page; margin-top: 6pt"><table cellpadding="0" cellspacing="0" style="border-collapse: collapse; width: 100%; font-size: 10pt"><tr style="vertical-align: top; text-align: left"><td style="width: 100%"><a href="#toc_001">Table of Contents</a></td></tr></table></div>
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>&#160;</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><span id="toc_001"></span>OCEAN
POWER TECHNOLOGIES, INC.</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>INDEX
TO FORM 10-Q</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>&#160;</b></span></p>

<table cellspacing="0" cellpadding="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 92%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: black 1pt solid; text-align: center; font: 10pt Times New Roman, Times, Serif; width: 8%"><p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Page</b></span></p>
    <p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Number</b></span></p></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><a href="#ds_001">PART I &#8212; FINANCIAL INFORMATION</a></b></span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; padding-left: 10pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><a href="#ds_002">Item 1. Financial Statements:</a></span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; padding-left: 20pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><a href="#ds_003">Consolidated Balance Sheets as of <span style="text-decoration: underline">January 31, 2022</span> (unaudited) and April 30, 2021</a></span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">4</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; padding-left: 20pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span style="text-decoration: underline"><a href="#ds_004">Unaudited Consolidated Statements of Operations for the three and nine &#160;months ended January 31, 2022 and 2021</a></span></span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">5</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; padding-left: 20pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span style="text-decoration: underline"><a href="#ds_005">Unaudited Consolidated Statements of Comprehensive Loss for the three and nine &#160;months ended January 31, 2022 and 2021</a></span></span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">6</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; padding-left: 20pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span style="text-decoration: underline"><a href="#ds_006">Unaudited Consolidated Statement of Shareholders&#8217; Equity for the three and nine &#160;months ended January 31, 2022 and 2021</a></span></span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">7</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; padding-left: 20pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span style="text-decoration: underline"><a href="#ds_007">Unaudited Consolidated Statements of Cash Flows for the nine months ended January 31, 2022 and 2021</a></span></span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">8</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; padding-left: 20pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><a href="#ds_008">Notes to Unaudited Consolidated Financial Statements</a></span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">9</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; padding-left: 10pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><a href="#ds_009">Item 2. Management&#8217;s Discussion and Analysis of Financial Condition and Results of Operations</a></span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">27</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; padding-left: 10pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><a href="#ds_010">Item 3. Quantitative and Qualitative Disclosures About Market Risk</a></span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">45</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; padding-left: 10pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><a href="#ds_011">Item 4. Controls and Procedures</a></span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">45</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><a href="#ds_012">PART II &#8212; OTHER INFORMATION</a></b></span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">46</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; padding-left: 10pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><a href="#ds_013">Item 1. Legal Proceedings</a></span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">46</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; padding-left: 10pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><a href="#ds_014">Item 1A. Risk Factors</a></span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">46</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; padding-left: 10pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><a href="#ds_015">Item 2. Unregistered Sales of Equity Securities and Use of Proceeds</a></span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">46</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; padding-left: 10pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><a href="#ds_016">Item 3. Defaults Upon Senior Securities</a></span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">46</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; padding-left: 10pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><a href="#ds_017">Item 4. Mine Safety Disclosures</a></span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">46</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; padding-left: 10pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><a href="#ds_018">Item 5. Other Information</a></span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">46</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; padding-left: 10pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><a href="#ds_019">Item 6. Exhibits</a></span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">47</span></td></tr>
  </table>
<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>


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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Special
Note Regarding Forward-Looking Statements</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">We
have made statements in this Quarterly Report on Form 10-Q that are forward-looking statements within the meaning of the Private Securities
Litigation Reform Act of 1995. Forward-looking statements convey our current expectations or forecasts of future events. Forward-looking
statements include statements regarding our future financial position, business strategy, pending, threatened, and current litigation,
liquidity, budgets, projected costs, plans and objectives of management for future operations. The words &#8220;may,&#8221; &#8220;continue,&#8221;
&#8220;estimate,&#8221; &#8220;intend,&#8221; &#8220;plan,&#8221; &#8220;will,&#8221; &#8220;believe,&#8221; &#8220;project,&#8221; &#8220;expect,&#8221;
&#8220;anticipate&#8221;, and similar expressions may identify forward-looking statements, but the absence of these words does not necessarily
mean that a statement is not forward-looking.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
forward-looking statements contained in or incorporated by reference are largely based on our expectations, which reflect estimates and
assumptions made by our management. These estimates and assumptions reflect our best judgment based on currently known market conditions
and other factors. Although we believe such estimates and assumptions to be reasonable, they are inherently uncertain and involve several
risks and uncertainties that are beyond our control, including:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<table cellspacing="0" cellpadding="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse"><tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
<td style="font: 10pt Times New Roman, Times, Serif; text-align: justify; width: 0.25in"></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify; width: 0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">our
                                            ability to develop, market and commercialize our products, and achieve and sustain profitability;</span></td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-align: justify; text-indent: -0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 0"><tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
<td style="font: 10pt Times New Roman, Times, Serif; text-align: justify; width: 0.25in"></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify; width: 0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">our
                                            continued development of our proprietary technologies, and expected continued use of cash
                                            from operating activities unless or until we achieve positive cash flow from the commercialization
                                            of our products and services;</span></td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-align: justify; text-indent: -0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 0"><tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
<td style="font: 10pt Times New Roman, Times, Serif; text-align: justify; width: 0.25in"></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify; width: 0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">our
                                            ability to obtain additional funding, as and if needed which will be subject to several factors,
                                            including market conditions, and our operating performance;</span></td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-align: justify; text-indent: -0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 0"><tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
<td style="font: 10pt Times New Roman, Times, Serif; text-align: justify; width: 0.25in"></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify; width: 0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">the
                                            continued impact of the COVID-19 pandemic and its variants on our business, operations, customers,
                                            suppliers and manufacturers and personnel;</span></td></tr><tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
<td style="font: 10pt Times New Roman, Times, Serif; text-align: justify">&#160;</td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify">&#160;</td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify">&#160;</td></tr>
                                                         <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
<td style="font: 10pt Times New Roman, Times, Serif; text-align: justify">&#160;</td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify">&#9679;</td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify">our
                                            ability to meet product development, manufacturing and customer delivery deadlines that may
                                            be impacted by disruptions to our supply chain, primarily related to labor shortages and
                                            manufacturing and transportation delays both here in the U.S. and abroad;</td></tr>
                                                         </table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-align: justify; text-indent: -0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 0"><tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
<td style="font: 10pt Times New Roman, Times, Serif; text-align: justify; width: 0.25in"></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify; width: 0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">our
                                            acquisitions and our ability to integrate them into our operations may use significant resources,
                                            be unsuccessful or expose us to unforeseen liabilities;</span></td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-align: justify; text-indent: -0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 0"><tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
<td style="font: 10pt Times New Roman, Times, Serif; text-align: justify; width: 0.25in"></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify; width: 0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">our
                                            estimates regarding future expenses,  revenues, and capital requirements;</span></td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-align: justify; text-indent: -0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 0"><tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
<td style="font: 10pt Times New Roman, Times, Serif; text-align: justify; width: 0.25in"></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify; width: 0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">the
                                            adequacy of our cash balances and our need for additional financings;</span></td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-align: justify; text-indent: -0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 0"><tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
<td style="font: 10pt Times New Roman, Times, Serif; text-align: justify; width: 0.25in"></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify; width: 0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">our
                                            ability to identify and penetrate markets for our products, services, and solutions;</span></td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-align: justify; text-indent: -0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 0"><tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
<td style="font: 10pt Times New Roman, Times, Serif; text-align: justify; width: 0.25in"></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify; width: 0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">our
                                            ability to implement our commercialization strategy as planned, or at all;</span></td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-align: justify; text-indent: -0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 0"><tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
<td style="font: 10pt Times New Roman, Times, Serif; text-align: justify; width: 0.25in"></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify; width: 0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">our
                                            relationships with our strategic partners may not be successful and we may not be successful
                                            in establishing additional relationships;</span></td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-align: justify; text-indent: -0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 0"><tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
<td style="font: 10pt Times New Roman, Times, Serif; text-align: justify; width: 0.25in"></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify; width: 0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">our
                                            ability to maintain the listing of our common stock on the NYSE American;</span></td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-align: justify; text-indent: -0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 0"><tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
<td style="font: 10pt Times New Roman, Times, Serif; text-align: justify; width: 0.25in"></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify; width: 0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">the
                                            reliability of our technology, products and solutions;</span></td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-align: justify; text-indent: -0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 0"><tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
<td style="font: 10pt Times New Roman, Times, Serif; text-align: justify; width: 0.25in"></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify; width: 0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">our
                                            ability to improve the power output and survivability of our products;</span></td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-align: justify; text-indent: -0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 0"><tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
<td style="font: 10pt Times New Roman, Times, Serif; text-align: justify; width: 0.25in"></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify; width: 0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">the
                                            impact of pending and threatened litigation on our business, financial condition and liquidity;</span></td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-align: justify; text-indent: -0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 0"><tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
<td style="font: 10pt Times New Roman, Times, Serif; text-align: justify; width: 0.25in"></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify; width: 0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">changes
                                            in current legislation, regulations and economic conditions that affect the demand for renewable
                                            energy, or restrict the use of our products;</span></td></tr><tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
<td style="font: 10pt Times New Roman, Times, Serif; text-align: justify">&#160;</td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify">&#160;</td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify">&#160;</td></tr>
                                                                                                         <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
<td style="font: 10pt Times New Roman, Times, Serif; text-align: justify">&#160;</td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify">&#9679;</td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify">our
                                            ability to attract and retain key personnel, including senior management, to achieve our
                                            business objectives;</td></tr>
                                                                                                         </table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-align: justify; text-indent: -0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 0"><tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
<td style="font: 10pt Times New Roman, Times, Serif; text-align: justify; width: 0.25in"></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify; width: 0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">our
                                            history of operating losses, which we expect to continue for at least the short term and
                                            possibly longer; and</span></td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-align: justify; text-indent: -0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 0"><tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
<td style="font: 10pt Times New Roman, Times, Serif; text-align: justify; width: 0.25in"></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify; width: 0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">our
                                            ability to protect our intellectual property portfolio.</span></td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-align: justify; text-indent: -0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Any
or all of our forward-looking statements in this report may turn out to be inaccurate. We have based these forward-looking statements
largely on our current expectations and projections about future events and financial trends that we believe may affect our financial
condition, results of operations, business strategy and financial needs. They may be affected by inaccurate assumptions we might make
or unknown risks and uncertainties, including the risks, uncertainties and assumptions described in Item 1A &#8220;Risk Factors&#8221;
of our Annual Report on Form 10-K for the year ended April 30, 2021, and in our subsequent reports under the Exchange Act. In light of
these risks, uncertainties and assumptions, the forward-looking events and circumstances discussed in this report may not occur as contemplated
and actual results could differ materially from those anticipated or implied by the forward-looking statements.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Many
of these factors are beyond our ability to control or predict. These factors are not intended to represent a complete list of the general
or specific factors that may affect us. You should not unduly rely on these forward-looking statements, which speak only as of the date
of this filing. Unless required by law, we undertake no obligation to publicly update or revise any forward-looking statements to reflect
new information or future events or otherwise.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>


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    <div style="break-before: page; margin-top: 6pt"><table cellpadding="0" cellspacing="0" style="border-collapse: collapse; width: 100%; font-size: 10pt"><tr style="vertical-align: top; text-align: left"><td style="width: 100%"><a href="#toc_001">Table of Contents</a></td></tr></table></div>
    <!-- Field: /Page -->

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><span id="ds_001"></span>PART
I &#8212; FINANCIAL INFORMATION</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><span id="ds_002"></span>Item
1. Financial Statements</b></span></p>



<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>&#160;</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Ocean
Power Technologies, Inc. and Subsidiaries</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><span id="ds_003"></span>Consolidated
Balance Sheets</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(in
$000&#8217;s, except share data)</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>&#160;</b></span></p>

<table cellpadding="0" cellspacing="0" summary="xdx: Statement - Consolidated Balance Sheets" id="xdx_30F_111_pn3n3_zyU52ebKGD3f" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" id="xdx_493_20220131_zWEp9uypBLkb" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">January
    31, 2022</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" id="xdx_497_20210430_zn8j2ojjjIj9" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">April
    30, 2021</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(Unaudited)</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_402_eus-gaap--AssetsAbstract_iB_zFOGGh1QhIIe" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">ASSETS</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_405_eus-gaap--AssetsCurrentAbstract_i01B_zJpudsDJLLfb" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Current
    assets:</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_40B_eus-gaap--CashAndCashEquivalentsAtCarryingValue_i02I_maCzGeP_z9H3bBszlXfc" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; padding-left: 10pt; width: 64%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Cash
    and cash equivalents</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:CashAndCashEquivalentsAtCarryingValue" contextRef="AsOf2022-01-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">63,454</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:CashAndCashEquivalentsAtCarryingValue" contextRef="AsOf2021-04-30" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">83,028</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_402_eus-gaap--RestrictedCashCurrent_i02I_maCzGeP_zcm7joYVo2zb" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
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  <tr id="xdx_402_eus-gaap--AccountsReceivableNetCurrent_i02I_maCzGeP_ziHrKXc3Xewf" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
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    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:AccountsReceivableNetCurrent" contextRef="AsOf2021-04-30" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">350</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_40D_eus-gaap--ContractWithCustomerAssetNetCurrent_i02I_maCzGeP_zVAmt1aguQv" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
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    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:ContractWithCustomerAssetNetCurrent" contextRef="AsOf2021-04-30" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">190</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_40D_eus-gaap--InventoryNet_i02I_maCzGeP_zRooy4jmTSU6" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
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    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span style="-sec-ix-hidden: xdx2ixbrl0064">&#8212;</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_40D_eus-gaap--OtherAssetsCurrent_i02I_maCzGeP_zfzSFAxQrH" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
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    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:OtherAssetsCurrent" contextRef="AsOf2022-01-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">436</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:OtherAssetsCurrent" contextRef="AsOf2021-04-30" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">487</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_401_eus-gaap--AssetsCurrent_i02TI_mtCzGeP_maCzsEY_zG47YGsiPv77" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; padding-left: 20pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Total
    current assets</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:AssetsCurrent" contextRef="AsOf2022-01-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">64,987</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:AssetsCurrent" contextRef="AsOf2021-04-30" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">84,439</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_405_eus-gaap--PropertyPlantAndEquipmentNet_i01I_maCzsEY_z9CArbgcPEce" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Property
    and equipment, net</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:PropertyPlantAndEquipmentNet" contextRef="AsOf2022-01-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">365</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:PropertyPlantAndEquipmentNet" contextRef="AsOf2021-04-30" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">406</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_403_eus-gaap--IntangibleAssetsNetExcludingGoodwill_i01I_maCzsEY_zDCzsrl676ee" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Intangibles,
    net</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:IntangibleAssetsNetExcludingGoodwill" contextRef="AsOf2022-01-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">4,203</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:IntangibleAssetsNetExcludingGoodwill" contextRef="AsOf2021-04-30" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">274</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_401_eus-gaap--OperatingLeaseRightOfUseAsset_i01I_maCzsEY_zFedy0LlFfzj" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Right-of-use
    asset, net</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:OperatingLeaseRightOfUseAsset" contextRef="AsOf2022-01-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">825</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:OperatingLeaseRightOfUseAsset" contextRef="AsOf2021-04-30" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">1,036</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_405_eus-gaap--RestrictedCashNoncurrent_i01I_maCzsEY_ztlj2dTFEFni" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Restricted
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    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:RestrictedCashNoncurrent" contextRef="AsOf2022-01-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">222</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:RestrictedCashNoncurrent" contextRef="AsOf2021-04-30" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">222</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_409_eus-gaap--Goodwill_i01I_maCzsEY_zqEcVYqMqBt1" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Goodwill</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"></span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span style="-sec-ix-hidden: xdx2ixbrl0085">&#8212;</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_403_eus-gaap--Assets_i01TI_mtCzsEY_zHqxG5lXFwxa" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; padding-left: 20pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Total
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    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left">$</td><td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:Assets" contextRef="AsOf2022-01-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">78,356</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:Assets" contextRef="AsOf2021-04-30" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">86,377</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_40C_eus-gaap--LiabilitiesAndStockholdersEquityAbstract_iB" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
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  <tr id="xdx_40E_eus-gaap--LiabilitiesCurrentAbstract_i01B_zuEyhmiAqHq8" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
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  <tr id="xdx_401_eus-gaap--AccountsPayableCurrent_i02I_maCzjlm_zB1AOCJQv6Xh" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
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  <tr id="xdx_402_eus-gaap--AccruedLiabilitiesCurrent_i02I_maCzjlm_zBDyTm1Oivrg" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
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  <tr id="xdx_40A_eus-gaap--ContractWithCustomerLiabilityCurrent_i02I_maCzjlm_zmum9O2JjTta" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; padding-left: 10pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Contract
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    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:ContractWithCustomerLiabilityCurrent" contextRef="AsOf2022-01-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">15</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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  <tr id="xdx_40B_eus-gaap--OperatingLeaseLiabilityCurrent_i02I_maCzjlm_z2H9BfOaHT07" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; padding-left: 10pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Right-of-use
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    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:OperatingLeaseLiabilityCurrent" contextRef="AsOf2022-01-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">323</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:OperatingLeaseLiabilityCurrent" contextRef="AsOf2021-04-30" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">347</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_405_ecustom--AdvancePayableCurrent_i02I_maCzjlm_zkiWMYnBvwyi" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; padding-left: 10pt; text-align: left">Advance payable </td><td style="font: 10pt Times New Roman, Times, Serif">&#160;</td>
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    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="-sec-ix-hidden: xdx2ixbrl0109">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right">-</td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left">&#160;</td></tr>
  <tr id="xdx_403_eus-gaap--LitigationReserveCurrent_i02I_maCzjlm_zigQNIPLIUc6" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; padding-left: 10pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Litigation
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    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span style="-sec-ix-hidden: xdx2ixbrl0111">&#160;</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">-</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:LitigationReserveCurrent" contextRef="AsOf2021-04-30" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">1,224</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_409_eus-gaap--BusinessCombinationContingentConsiderationLiabilityCurrent_i02I_maCzjlm_zvi0iQZjyGlc" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; padding-left: 10pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Contingent
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    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:BusinessCombinationContingentConsiderationLiabilityCurrent" contextRef="AsOf2022-01-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">1,591</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:BusinessCombinationContingentConsiderationLiabilityCurrent" contextRef="AsOf2021-04-30" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">60</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_40B_eus-gaap--LongTermDebtCurrent_i02I_maCzjlm_zpn5MjW4NL9g" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; padding-left: 10pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Paycheck
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    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span style="-sec-ix-hidden: xdx2ixbrl0117">&#8212;</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:LongTermDebtCurrent" contextRef="AsOf2021-04-30" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">495</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_401_eus-gaap--LiabilitiesCurrent_i02TI_mtCzjlm_maCzj3x_zcUuvDSc0k7b" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
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    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:LiabilitiesCurrent" contextRef="AsOf2021-04-30" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">4,694</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_40A_eus-gaap--LongTermDebtNoncurrent_i01I_maCzj3x_z04nSF5BY0d5" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
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    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span style="-sec-ix-hidden: xdx2ixbrl0123">&#8212;</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:LongTermDebtNoncurrent" contextRef="AsOf2021-04-30" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">396</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_40D_eus-gaap--OperatingLeaseLiabilityNoncurrent_i01I_maCzj3x_zxtXPoIY2erf" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
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  <tr id="xdx_409_eus-gaap--Liabilities_i01TI_mtCzj3x_maLASEz4d6_zzR7KDWh7E2b" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
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  <tr id="xdx_402_eus-gaap--CommitmentsAndContingencies_i01I_maLASEz4d6_zxqMmRB5s4n4" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
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  <tr id="xdx_402_eus-gaap--StockholdersEquityAbstract_i01B" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
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  <tr id="xdx_403_eus-gaap--PreferredStockValue_i02I_maSEzqDi_zloAEGSp39Li" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
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  <tr id="xdx_403_eus-gaap--CommonStockValue_i02I_pn3n3_maSEzqDi_zrYZ2vYL2zT1" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; padding-left: 10pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Common
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    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:CommonStockValue" contextRef="AsOf2021-04-30" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">52</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_406_eus-gaap--TreasuryStockValue_i02NI_di_msSEzqDi_zGZektKiK3hl" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; padding-left: 10pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Treasury
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  <tr id="xdx_409_eus-gaap--AdditionalPaidInCapital_i02I_maSEzqDi_zezu6qJtjbRe" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
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    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:AdditionalPaidInCapital" contextRef="AsOf2021-04-30" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">315,821</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
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  </table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">See
accompanying notes to unaudited consolidated financial statements.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>


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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>&#160;</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Ocean
Power Technologies, Inc. and Subsidiaries</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><span id="ds_004"></span>Consolidated
Statements of Operations</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(in
$000&#8217;s, except per share data)</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Unaudited</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>&#160;</b></span></p>

<table cellpadding="0" cellspacing="0" summary="xdx: Statement - Consolidated Statements of Operations (Unaudited)" id="xdx_300_113_pn3n3_zC2beeLNzAhi" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="font: 10pt Times New Roman, Times, Serif; display: none; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" id="xdx_499_20211101__20220131_zFmDNVyjLzH1" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">2022</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" id="xdx_496_20201101__20210131_ztDsZpX0VZ84" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">2021</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" id="xdx_491_20210501__20220131_zJA0VmKckMFe" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">2022</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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<tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="6" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Three
    months ended January 31,</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="6" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Nine
    months ended January 31,</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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    <td style="font: 10pt Times New Roman, Times, Serif; width: 36%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Revenues</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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  <tr id="xdx_40B_eus-gaap--OperatingExpensesAbstract_iB_zdCVcYoQgCY5" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
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  <tr id="xdx_405_eus-gaap--ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost_i01_maCzRKs_zFrp7fkDG1R1" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
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  <tr id="xdx_40B_eus-gaap--SellingGeneralAndAdministrativeExpense_i01_maCzRKs_z3b7i64r6vEj" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
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  <tr id="xdx_406_eus-gaap--InterestIncomeExpenseNet_maCz2Lp_zaAuDwXHT5Ih" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
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  <tr id="xdx_409_eus-gaap--ForeignCurrencyTransactionGainLossBeforeTax_maCz2Lp_zj9MuLJNIkFi" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
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  <tr id="xdx_40A_eus-gaap--IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_iT_mtCz2Lp_maCzH8M_zQs2TAZ4POu" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Loss
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    <td style="font: 10pt Times New Roman, Times, Serif; padding-left: 10pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Weighted
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  </table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">See
accompanying notes to unaudited consolidated financial statements.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>


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    <div style="break-before: page; margin-top: 6pt"><table cellpadding="0" cellspacing="0" style="border-collapse: collapse; width: 100%; font-size: 10pt"><tr style="vertical-align: top; text-align: left"><td style="width: 100%"><a href="#toc_001">Table of Contents</a></td></tr></table></div>
    <!-- Field: /Page -->

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Ocean
Power Technologies, Inc. and Subsidiaries</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><span id="ds_005"></span>Consolidated
Statements of Comprehensive Loss</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(in
$000&#8217;s)</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Unaudited</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>&#160;</b></span></p>

<table cellpadding="0" cellspacing="0" summary="xdx: Statement - Consolidated Statements of Comprehensive Loss (Unaudited)" id="xdx_305_113_pn3n3_zMytAe0u9LJg" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="font: 10pt Times New Roman, Times, Serif; display: none; vertical-align: bottom">
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    <td colspan="2" id="xdx_49D_20211101__20220131_zjtQy0PJkKyd" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">2022</span></td><td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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<tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
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    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left; padding-bottom: 1pt; padding-left: 2.65pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Foreign
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    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(<ix:nonFraction name="us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax" contextRef="From2021-11-012022-01-31" format="ixt:numdotdecimal" decimals="-3" scale="3" sign="-" unitRef="USD">1</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">)</span></td><td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left; padding-bottom: 2.5pt; padding-left: 2.65pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Total
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  </table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">See
accompanying notes to unaudited consolidated financial statements.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>


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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>&#160;</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Ocean
Power Technologies, Inc. and Subsidiaries</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><span id="ds_006"></span>Consolidated
Statement of Shareholders&#8217; Equity</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(in
$000&#8217;s, except share data)</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Unaudited</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>&#160;</b></span></p>

<table cellpadding="0" cellspacing="0" id="xdx_308_114_pn3n3_zxbYlWG6O21" summary="xdx: Statement - Consolidated Statement of Stockholders&apos; Equity (Unaudited)" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="font: 10pt Times New Roman, Times, Serif; display: none; vertical-align: bottom">
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    <td colspan="2" id="xdx_4B0_us-gaap--StatementEquityComponentsAxis_custom--StockSubscriptionReceivableMember_zxTS2Ypc8Ine" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Receivable</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" id="xdx_4B8_us-gaap--StatementEquityComponentsAxis_us-gaap--RetainedEarningsMember_z1UyzkdkQn3j" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Deficit</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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    <td colspan="2" id="xdx_4B2_zwxzS5Cp7EV1" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Equity</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
<tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="34" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Nine
    Months Ended January 31, 2022</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="6" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Common
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    <td colspan="6" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Treasury
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    <td colspan="2" style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Additional</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Paid-In
                                            </b></span></p></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1pt; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Stock
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    <td colspan="2" style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Accumulated
                                            </b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"></p></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Accumulated
                                            </b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Other
                                            </b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Comprehensive
                                            </b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"></p></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Total
                                            </b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Shareholders&#8217;</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"></p></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Shares</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Amount</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Shares</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Amount</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Capital</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Receivable</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Deficit</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Loss</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Equity</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_43A_c20210501__20220131_eus-gaap--StockholdersEquity_iS_znsFT0CJzvvc" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 28%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Balances
    at May 1, 2021</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td id="xdx_980_eus-gaap--SharesOutstanding_iS_pid_c20210501__20220131__us-gaap--StatementEquityComponentsAxis__us-gaap--CommonStockMember_zUB0J7obJBi7" title="Beginning balance, shares" style="font: 10pt Times New Roman, Times, Serif; width: 4%; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:SharesOutstanding" contextRef="AsOf2021-04-30_us-gaap_CommonStockMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">52,479,051</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 4%; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:StockholdersEquity" contextRef="AsOf2021-04-30_us-gaap_CommonStockMember" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">52</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td id="xdx_98C_eus-gaap--SharesOutstanding_iS_pid_c20210501__20220131__us-gaap--StatementEquityComponentsAxis__us-gaap--TreasuryStockMember_zHj4h8tgjc68" title="Beginning balance, shares" style="font: 10pt Times New Roman, Times, Serif; width: 4%; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(<ix:nonFraction name="us-gaap:SharesOutstanding" contextRef="AsOf2021-04-30_us-gaap_TreasuryStockMember" format="ixt:numdotdecimal" decimals="INF" sign="-" unitRef="Shares">21,040</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">)</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 4%; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(<ix:nonFraction name="us-gaap:StockholdersEquity" contextRef="AsOf2021-04-30_us-gaap_TreasuryStockMember" format="ixt:numdotdecimal" decimals="-3" scale="3" sign="-" unitRef="USD">338</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">)</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 4%; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span style="-sec-ix-hidden: xdx2ixbrl0297">&#8212;</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(<ix:nonFraction name="us-gaap:StockholdersEquity" contextRef="AsOf2022-01-31_us-gaap_AccumulatedOtherComprehensiveIncomeMember" format="ixt:numdotdecimal" decimals="-3" scale="3" sign="-" unitRef="USD">185</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">)</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="34" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Nine
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  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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    <td colspan="6" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Treasury
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    <td colspan="2" style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Additional</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Paid-In
                                            </b></span></p></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1pt; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Stock
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    <td colspan="2" style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Accumulated
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    <td colspan="2" style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Accumulated
                                            </b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Other
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    <td colspan="2" style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Total
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  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Shares</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Amount</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Shares</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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    <td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Capital</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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    <td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Deficit</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Loss</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Equity</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_430_c20200501__20210131_eus-gaap--StockholdersEquity_iS_zgLO8h9GyI7k" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 28%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Balances
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
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    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="34" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Three
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    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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    <td colspan="2" style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1pt; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Stock
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  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
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  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_43B_c20211101__20220131_eus-gaap--StockholdersEquity_iS_zQZ7muzqonIe" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="34" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Three
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  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="6" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Common
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    <td colspan="6" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Treasury
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                                            </b></span></p></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1pt; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Stock
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    <td colspan="2" style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Accumulated
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    <td colspan="2" style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Accumulated
                                            </b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Other
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                                            </b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Shareholders&#8217;</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"></p></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
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    <td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Amount</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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    <td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Loss</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Equity</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_433_c20201101__20210131_eus-gaap--StockholdersEquity_iS_zyePnZyyE6nc" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 28%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Balances
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    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 4%; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:StockholdersEquity" contextRef="AsOf2020-10-31_us-gaap_AdditionalPaidInCapitalMember" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">240,782</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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  <tr id="xdx_43F_c20201101__20210131_eus-gaap--StockholdersEquity_iS_z3tXh091Rj14" style="font: 10pt Times New Roman, Times, Serif; display: none; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Beginning
    balances</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td id="xdx_984_eus-gaap--SharesOutstanding_iS_pid_c20201101__20210131__us-gaap--StatementEquityComponentsAxis__us-gaap--CommonStockMember_zIbyZ5vAtDKi" title="Beginning balance, shares" style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:SharesOutstanding" contextRef="AsOf2020-10-31_us-gaap_CommonStockMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">24,153,554</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td id="xdx_98E_eus-gaap--SharesOutstanding_iS_pid_c20201101__20210131__us-gaap--StatementEquityComponentsAxis__us-gaap--TreasuryStockMember_ziAQKouLGiF3" title="Beginning balance, shares" style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(<ix:nonFraction name="us-gaap:SharesOutstanding" contextRef="AsOf2020-10-31_us-gaap_TreasuryStockMember" format="ixt:numdotdecimal" decimals="INF" sign="-" unitRef="Shares">4,251</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">)</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(<ix:nonFraction name="us-gaap:StockholdersEquity" contextRef="AsOf2020-10-31_us-gaap_TreasuryStockMember" format="ixt:numdotdecimal" decimals="-3" scale="3" sign="-" unitRef="USD">302</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">)</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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<tr id="xdx_403_eus-gaap--NetIncomeLoss_ziuVBYO3XR2i" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
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    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span style="-sec-ix-hidden: xdx2ixbrl0633">&#8212;</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span style="-sec-ix-hidden: xdx2ixbrl0634">&#8212;</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(<ix:nonFraction name="us-gaap:NetIncomeLoss" contextRef="From2020-11-012021-01-31_us-gaap_RetainedEarningsMember" format="ixt:numdotdecimal" decimals="-3" scale="3" sign="-" unitRef="USD">3,151</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">)</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(<ix:nonFraction name="us-gaap:NetIncomeLoss" contextRef="From2020-11-012021-01-31" format="ixt:numdotdecimal" decimals="-3" scale="3" sign="-" unitRef="USD">3,151</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">)</span></td></tr>
  <tr id="xdx_40E_eus-gaap--AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_zf4RotuPi9p6" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
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<tr id="xdx_43D_c20201101__20210131_eus-gaap--StockholdersEquity_iE_z0M868gQs7bi" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
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  <tr id="xdx_430_c20201101__20210131_eus-gaap--StockholdersEquity_iE_zCRlTqpoSAJ5" style="font: 10pt Times New Roman, Times, Serif; display: none; vertical-align: bottom; background-color: White">
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</table>



<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">See
accompanying notes to unaudited consolidated financial statements.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>


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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>&#160;</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Ocean
Power Technologies, Inc. and Subsidiaries</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><span id="ds_007"></span>Consolidated
Statements of Cash Flows</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(in
$000&#8217;s)</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Unaudited</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>&#160;</b></span></p>

<table cellpadding="0" cellspacing="0" summary="xdx: Statement - Consolidated Statements of Cash Flows (Unaudited)" id="xdx_30F_114_pn3n3_zhWRzmQHCsI3" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="font: 10pt Times New Roman, Times, Serif; display: none; vertical-align: bottom">
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<tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="6" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Nine
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    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Cash
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    <td style="font: 10pt Times New Roman, Times, Serif; padding-left: 10pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Adjustments
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  <tr id="xdx_400_eus-gaap--OperatingLeaseRightOfUseAssetAmortizationExpense_i02_maNCPBUzr7h_zZ3fEv4hoRU6" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
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  <tr id="xdx_401_eus-gaap--IncreaseDecreaseInOperatingCapitalAbstract_i02B_zu4DVHoSksBb" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
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  <tr id="xdx_405_eus-gaap--IncreaseDecreaseInAccountsReceivable_i03N_di_msNCPBUzr7h_zonuUkCSGYde" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
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  <tr id="xdx_408_eus-gaap--IncreaseDecreaseInContractWithCustomerAsset_i03N_di_msNCPBUzr7h_z8Ix4Q7vUdBe" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
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  <tr id="xdx_400_eus-gaap--IncreaseDecreaseInInventories_i03N_di_msNCPBUzr7h_zSrsIrMG9svc" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
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  <tr id="xdx_40B_eus-gaap--IncreaseDecreaseInAccountsPayable_i03_maNCPBUzr7h_z8OK3QvHmKOk" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
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  <tr id="xdx_405_eus-gaap--IncreaseDecreaseInAccruedLiabilities_i03_maNCPBUzr7h_zZu1TsVQdHy6" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
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  <tr id="xdx_409_ecustom--IncreaseDecreaseInLitigationPayable_i03_maNCPBUzr7h_ziV1eJ1jj5Kc" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
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  <tr id="xdx_406_eus-gaap--NetCashProvidedByUsedInOperatingActivities_i01T_mtNCPBUzr7h_maCCERCzL1R_zBhDFKRLyNN7" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; padding-left: 40pt; text-align: left; padding-bottom: 1pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Net
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  <tr id="xdx_40C_eus-gaap--NetCashProvidedByUsedInInvestingActivitiesAbstract_iB_zb7dxdxfDrCc" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Cash
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  <tr id="xdx_403_eus-gaap--PaymentsToAcquireProductiveAssets_i01N_di_msNCPBUzZLJ_zmgZdNZcseAj" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; padding-left: 10pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Purchase
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    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(<ix:nonFraction name="us-gaap:PaymentsToAcquireProductiveAssets" contextRef="From2021-05-01to2022-01-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">319</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">)</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(<ix:nonFraction name="us-gaap:PaymentsToAcquireProductiveAssets" contextRef="From2020-05-012021-01-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">17</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">)</span></td></tr>
  <tr id="xdx_401_eus-gaap--PaymentsToAcquireBusinessesNetOfCashAcquired_i01N_di_msNCPBUzZLJ_zhMFr7a066j9" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; padding-left: 10pt; text-align: left; padding-bottom: 1pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Payments
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    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(<ix:nonFraction name="us-gaap:PaymentsToAcquireBusinessesNetOfCashAcquired" contextRef="From2021-05-01to2022-01-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">3,544</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">)</span></td><td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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  <tr id="xdx_40F_eus-gaap--NetCashProvidedByUsedInInvestingActivities_i01T_mtNCPBUzZLJ_maCCERCzL1R_z52ulyxZ7hNk" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; padding-left: 40pt; text-align: left; padding-bottom: 1pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Net
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  <tr id="xdx_40A_eus-gaap--NetCashProvidedByUsedInFinancingActivitiesAbstract_iB_zVQBxUutBiF8" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Cash
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    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_405_eus-gaap--ProceedsFromIssuanceOfLongTermDebt_i01_maNCPBUzvs4_z1Lxc5YKDhn7" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; padding-left: 10pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Proceeds
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  <tr id="xdx_401_eus-gaap--NetCashProvidedByUsedInFinancingActivities_i01T_mtNCPBUzvs4_maCCERCzL1R_zhnu6A9cWADh" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
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    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
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  <tr id="xdx_404_ecustom--IssuanceOfCommonStockInAcquisition_i01_zFxPPURqrbph" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
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  <tr id="xdx_407_ecustom--AdvancePayable_i01_z9EKTlltfkRa" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
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  <tr id="xdx_405_ecustom--ContingentLiability_i01_z3UuSvoZ8Tqh" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; padding-left: 10pt; text-align: left">Contingent liability</td><td style="font: 10pt Times New Roman, Times, Serif">&#160;</td>
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    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="OPTT:OutstandingReceivableForSaleOfSharesFromStockOptionExercises" contextRef="From2020-05-012021-01-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">144</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  </table>


<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">See
accompanying notes to unaudited consolidated financial statements.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>


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    <div style="break-before: page; margin-top: 6pt"><table cellpadding="0" cellspacing="0" style="border-collapse: collapse; width: 100%; font-size: 10pt"><tr style="vertical-align: top; text-align: left"><td style="width: 100%"><a href="#toc_001">Table of Contents</a></td></tr></table></div>
    <!-- Field: /Page -->

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Ocean
Power Technologies, Inc. and Subsidiaries</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 7.7pt; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><span id="ds_008"></span>Notes
to Unaudited Consolidated Financial Statements</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 7.7pt; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<ix:nonNumeric contextRef="From2021-05-01to2022-01-31" escape="true" name="us-gaap:BusinessDescriptionAndBasisOfPresentationTextBlock"><p id="xdx_806_eus-gaap--BusinessDescriptionAndBasisOfPresentationTextBlock_zkWcjBuhQ4L5" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(1)
<span id="xdx_826_zS6TElivvWR2">Background, Basis of Presentation and Liquidity</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>(a)
Background</i></b></span></p>



<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.25in; text-indent: -0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>&#160;</i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Ocean
Power Technologies, Inc. (the &#8220;Company&#8221;) was founded in 1984 in New Jersey, commenced business operations in 1994 and re-incorporated
in Delaware in 2007. We are a complete solutions provider, controlling the design, manufacturing, sales, installation, operations and
maintenance of our products and services. Our solutions provide distributed offshore power which is persistent, reliable, and economical
along with power and communications for remote surface and subsea applications. Historically, funding from government agencies, such
as research and development grants, accounted for a significant portion of the Company&#8217;s revenues. Today our goal is to generate
the majority of our revenue from the sale or lease of our products and solutions, and sales of services to support our business operations.
As we continue to develop and commercialize our products and services, we expect to have a net decrease in cash due to the use of cash
from operating activities unless and until we achieve positive cash flow from the commercialization of products, solutions and services.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>(b)
Basis of Presentation</i></b></span></p>



<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.25in; text-indent: -0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>&#160;</i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
accompanying unaudited consolidated financial statements have been prepared in accordance with accounting principles generally accepted
in the United States of America (&#8220;GAAP&#8221;) and for interim financial information in accordance with the Securities and Exchange
Commission (&#8220;SEC&#8221;), instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all the
information and footnotes required by GAAP for complete financial statements. In the opinion of management, all adjustments (consisting
of normal recurring adjustments) considered necessary for a fair presentation have been included. The interim operating results are not
necessarily indicative of the results for a full year or for any other interim period. Further information on potential factors that
could affect the Company&#8217;s financial results can be found in the Company&#8217;s Annual Report on Form 10-K for the year ended
April 30, 2021, as filed with the SEC and elsewhere in this Form 10-Q. Certain items have been reclassified from prior periods to be
consistent with current GAAP presentations.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>(c)
Liquidity</i></b></span></p>



<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.25in; text-indent: -0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>&#160;</i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">For
the nine months ended January 31, 2022, and the fiscal year ended April 30, 2021, the Company incurred net losses of approximately $<span id="xdx_905_eus-gaap--NetIncomeLoss_iN_pn5n6_di_c20210501__20220131_zJzs7XuJKCr8" title="Net loss"><ix:nonFraction name="us-gaap:NetIncomeLoss" contextRef="From2021-05-01to2022-01-31" format="ixt:numdotdecimal" decimals="-5" scale="6" sign="-" unitRef="USD">13.7</ix:nonFraction>
</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">million and $<span id="xdx_906_eus-gaap--NetIncomeLoss_iN_pn5n6_di_c20200501__20210430_zqag8EAq5Vch" title="Net loss"><ix:nonFraction name="us-gaap:NetIncomeLoss" contextRef="From2020-05-012021-04-30" format="ixt:numdotdecimal" decimals="-5" scale="6" sign="-" unitRef="USD">14.8</ix:nonFraction>
</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">million, respectively, and used cash in operating
activities of approximately $<span id="xdx_908_eus-gaap--NetCashProvidedByUsedInOperatingActivities_iN_pn5n6_di_c20210501__20220131_zSVVxKozt4Rj" title="Net cash in operating activities"><ix:nonFraction name="us-gaap:NetCashProvidedByUsedInOperatingActivities" contextRef="From2021-05-01to2022-01-31" format="ixt:numdotdecimal" decimals="-5" scale="6" sign="-" unitRef="USD">15.8</ix:nonFraction>
</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">million and $<span id="xdx_900_eus-gaap--NetCashProvidedByUsedInOperatingActivities_iN_pn5n6_di_c20200501__20210430_zPz2ST3dW749" title="Net cash in operating activities"><ix:nonFraction name="us-gaap:NetCashProvidedByUsedInOperatingActivities" contextRef="From2020-05-012021-04-30" format="ixt:numdotdecimal" decimals="-5" scale="6" sign="-" unitRef="USD">11.7</ix:nonFraction>
</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">million, respectively. The Company has continued
to make investments in ongoing product development efforts in anticipation of future growth, including its recent acquisition of Marine
Advanced Robotics, Inc., as described in Note 18. The Company&#8217;s future results of operations involve significant risks and uncertainties.
Factors that could affect the Company&#8217;s future operating results and could cause actual results to vary materially from expectations
include, but are not limited to, performance of its products, its ability to market and commercialize its products and new products that
it may develop, technology development, scalability of technology and production, ability to attract and retain key personnel, concentration
of customers and suppliers, deployment risks and integration of acquisitions, pending or threatened litigation, and the impact of COVID-19,
and any variants on its business. The Company previously obtained equity financing through its At the Market Offering Agreement (&#8220;ATM&#8221;)
with A.G.P/Alliance Global Partners (&#8220;AGP&#8221;) and through its equity line financing with Aspire Capital Fund, LLC (&#8220;Aspire
Capital&#8221;), but the Company cannot be sure that additional equity and/or debt financing will be available to the Company as needed
on acceptable terms, or at all. For fiscal year 2022 to date, management has not obtained any additional capital financing. Management
believes the Company&#8217;s current cash balance of $<span id="xdx_907_eus-gaap--Cash_iI_pn5n6_c20220131_zzYnUqU3V4sh"><ix:nonFraction name="us-gaap:Cash" contextRef="AsOf2022-01-31" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">63.5</ix:nonFraction></span></span>
<span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">million is sufficient to fund its planned expenditures through
at least March 2023.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">On
January 7, 2019, the Company entered into an At the Market Offering Agreement with AGP (the &#8220;2019 ATM Facility&#8221;), under which
the Company could issue and sell to or through AGP, acting as agent and/or principal, shares of the Company&#8217;s common stock having
an aggregate offering price of up to $<span id="xdx_904_eus-gaap--ProceedsFromIssuanceInitialPublicOffering_pn5n6_c20190106__20190107__us-gaap--TypeOfArrangementAxis__custom--TwoThousandNinteenATMFacilityMember__dei--LegalEntityAxis__custom--AGPAllianceGlobalPartnersMember_zqyQZ18NAmnh" title="Proceeds from initial public offering"><ix:nonFraction name="us-gaap:ProceedsFromIssuanceInitialPublicOffering" contextRef="From2019-01-062019-01-07_custom_TwoThousandNinteenATMFacilityMember_custom_AGPAllianceGlobalPartnersMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">25.0</ix:nonFraction></span> million. From inception of the program through its termination on December 8, 2020, under
the 2019 ATM Facility, the Company sold and issued an aggregate of <span id="xdx_90E_eus-gaap--SaleOfStockNumberOfSharesIssuedInTransaction_pid_c20190106__20190107__us-gaap--TypeOfArrangementAxis__custom--TwoThousandNinteenATMFacilityMember__dei--LegalEntityAxis__custom--AGPAllianceGlobalPartnersMember_zDTm2R3uSKvi" title="Number of common stock shares sold"><ix:nonFraction name="us-gaap:SaleOfStockNumberOfSharesIssuedInTransaction" contextRef="From2019-01-062019-01-07_custom_TwoThousandNinteenATMFacilityMember_custom_AGPAllianceGlobalPartnersMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">17,595,472</ix:nonFraction></span> shares of its common stock with an aggregate market value
of $<span id="xdx_903_eus-gaap--SaleOfStockConsiderationReceivedPerTransaction_pn5n6_c20190106__20190107__us-gaap--TypeOfArrangementAxis__custom--TwoThousandNinteenATMFacilityMember__dei--LegalEntityAxis__custom--AGPAllianceGlobalPartnersMember_zspnLaf4ker1" title="Proceeds from issuance or sale of equity, net of issuance costs"><ix:nonFraction name="us-gaap:SaleOfStockConsiderationReceivedPerTransaction" contextRef="From2019-01-062019-01-07_custom_TwoThousandNinteenATMFacilityMember_custom_AGPAllianceGlobalPartnersMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">23.4</ix:nonFraction></span> million at an average price of $<span id="xdx_90F_eus-gaap--SaleOfStockPricePerShare_iI_pid_c20190107__us-gaap--TypeOfArrangementAxis__custom--TwoThousandNinteenATMFacilityMember__dei--LegalEntityAxis__custom--AGPAllianceGlobalPartnersMember_z6Wv99wrEUl5" title="Average purchase price per share"><ix:nonFraction name="us-gaap:SaleOfStockPricePerShare" contextRef="AsOf2019-01-07_custom_TwoThousandNinteenATMFacilityMember_custom_AGPAllianceGlobalPartnersMember" format="ixt:numdotdecimal" decimals="INF" unitRef="USDPShares">1.33</ix:nonFraction></span> per share, including <span id="xdx_908_eus-gaap--SaleOfStockNumberOfSharesIssuedInTransaction_pid_c20190106__20190107__dei--LegalEntityAxis__custom--AGPAllianceGlobalPartnersMember_zVH1837TVZXe" title="Number of common stock shares sold"><ix:nonFraction name="us-gaap:SaleOfStockNumberOfSharesIssuedInTransaction" contextRef="From2019-01-062019-01-07_custom_AGPAllianceGlobalPartnersMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">12,342,506</ix:nonFraction></span> shares in fiscal year 2021 with an aggregate market value
of $<span id="xdx_900_eus-gaap--SaleOfStockConsiderationReceivedPerTransaction_pn5n6_c20190106__20190107__dei--LegalEntityAxis__custom--AGPAllianceGlobalPartnersMember_zBjAoYMsRVD7" title="Proceeds from issuance or sale of equity, net of issuance costs"><ix:nonFraction name="us-gaap:SaleOfStockConsiderationReceivedPerTransaction" contextRef="From2019-01-062019-01-07_custom_AGPAllianceGlobalPartnersMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">18.7</ix:nonFraction></span> million at an average price of $<span id="xdx_906_eus-gaap--SaleOfStockPricePerShare_iI_pid_c20190701__dei--LegalEntityAxis__custom--AGPAllianceGlobalPartnersMember_zJqwl1LzcXb5" title="Combined purchase price per share"><ix:nonFraction name="us-gaap:SaleOfStockPricePerShare" contextRef="AsOf2019-07-01_custom_AGPAllianceGlobalPartnersMember" format="ixt:numdotdecimal" decimals="INF" unitRef="USDPShares">1.51</ix:nonFraction></span> per share and paid AGP a sales commission of approximately $<span id="xdx_905_ecustom--PaymentOfSalesCommission_pn5n6_c20190106__20190107__us-gaap--TypeOfArrangementAxis__custom--TwoThousandNinteenATMFacilityMember__dei--LegalEntityAxis__custom--AGPAllianceGlobalPartnersMember_zKrYzQkr3Xna" title="Payment of sales commission"><ix:nonFraction name="OPTT:PaymentOfSalesCommission" contextRef="From2019-01-062019-01-07_custom_TwoThousandNinteenATMFacilityMember_custom_AGPAllianceGlobalPartnersMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">0.8</ix:nonFraction></span> million related to those
shares. The agreement was fully utilized and terminated on December 8, 2020.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"></p>

<ix:exclude><!-- Field: Page; Sequence: 9; Value: 2 -->
    <div style="border-bottom: Black 1.5pt solid; margin-bottom: 6pt"><table cellpadding="0" cellspacing="0" style="border-collapse: collapse; width: 100%; font-size: 10pt"><tr style="vertical-align: top; text-align: left"><td style="text-align: center; width: 100%"><!-- Field: Sequence; Type: Arabic; Name: PageNo -->9<!-- Field: /Sequence --></td></tr></table></div>
    <div style="break-before: page; margin-top: 6pt"><table cellpadding="0" cellspacing="0" style="border-collapse: collapse; width: 100%; font-size: 10pt"><tr style="vertical-align: top; text-align: left"><td style="width: 100%"><a href="#toc_001">Table of Contents</a></td></tr></table></div>
    <!-- Field: /Page --></ix:exclude>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">On
November 20, 2020, the Company entered into another At the Market Offering Agreement with AGP (the &#8220;2020 ATM Facility&#8221;),
having capacity up to $<span id="xdx_901_eus-gaap--DeferredOfferingCosts_iI_pn5n6_c20201120_zrwXDFFFR2Ha" title="Deferred Offering Costs"><ix:nonFraction name="us-gaap:DeferredOfferingCosts" contextRef="AsOf2020-11-20" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">100.0</ix:nonFraction></span> million. On December 4, 2020, the Company filed a prospectus with the Securities and Exchange Commission
whereby, the Company could issue and sell to or through AGP, acting as agent and/or principal, shares of the Company&#8217;s common stock
having an aggregate offering price of up to $<span id="xdx_900_ecustom--ProceedsFromInitialPublicOffering_pn5n6_c20201118__20201120__us-gaap--TypeOfArrangementAxis__custom--TwoThousandTwentyATMFacilityMember__dei--LegalEntityAxis__custom--AGPAllianceGlobalPartnersMember_z9CC9Z2TQ58c" title="Proceeds from initial public offering"><ix:nonFraction name="OPTT:ProceedsFromInitialPublicOffering" contextRef="From2020-11-182020-11-20_custom_TwoThousandTwentyATMFacilityMember_custom_AGPAllianceGlobalPartnersMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">50.0</ix:nonFraction></span> million. From inception of the 2020 ATM Facility through January 31, 2022, the Company
had sold and issued an aggregate of <span id="xdx_900_eus-gaap--SaleOfStockNumberOfSharesIssuedInTransaction_pid_c20210501__20220131__us-gaap--TypeOfArrangementAxis__custom--TwoThousandTwentyATMFacilityMember__dei--LegalEntityAxis__custom--AGPAllianceGlobalPartnersMember_zxlJY405TmBk" title="Number of common stock shares sold"><ix:nonFraction name="us-gaap:SaleOfStockNumberOfSharesIssuedInTransaction" contextRef="From2021-05-012022-01-31_custom_TwoThousandTwentyATMFacilityMember_custom_AGPAllianceGlobalPartnersMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">17,179,883</ix:nonFraction></span> shares of its common stock with an aggregate market value of $<span id="xdx_90F_eus-gaap--SaleOfStockConsiderationReceivedPerTransaction_pn5n6_c20210501__20220131__us-gaap--TypeOfArrangementAxis__custom--TwoThousandTwentyATMFacilityMember__dei--LegalEntityAxis__custom--AGPAllianceGlobalPartnersMember_zpcxC0lXPuCk" title="Proceeds from issuance or sale of equity, net of issuance costs"><ix:nonFraction name="us-gaap:SaleOfStockConsiderationReceivedPerTransaction" contextRef="From2021-05-012022-01-31_custom_TwoThousandTwentyATMFacilityMember_custom_AGPAllianceGlobalPartnersMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">50.0</ix:nonFraction></span> million at an average
price of $<span id="xdx_90E_eus-gaap--SaleOfStockPricePerShare_iI_pid_c20220131__us-gaap--TypeOfArrangementAxis__custom--TwoThousandTwentyATMFacilityMember__dei--LegalEntityAxis__custom--AGPAllianceGlobalPartnersMember_z2SqAYI9mROl" title="Combined purchase price per share"><ix:nonFraction name="us-gaap:SaleOfStockPricePerShare" contextRef="AsOf2022-01-31_custom_TwoThousandTwentyATMFacilityMember_custom_AGPAllianceGlobalPartnersMember" format="ixt:numdotdecimal" decimals="INF" unitRef="USDPShares">2.91</ix:nonFraction></span> per share and paid AGP a sales commission of approximately $<span id="xdx_905_ecustom--PaymentOfSalesCommission_pn5n6_c20210501__20220131__us-gaap--TypeOfArrangementAxis__custom--TwoThousandTwentyATMFacilityMember__dei--LegalEntityAxis__custom--AGPAllianceGlobalPartnersMember_zjuJmXNgWEO5" title="Payment of sales commission"><ix:nonFraction name="OPTT:PaymentOfSalesCommission" contextRef="From2021-05-012022-01-31_custom_TwoThousandTwentyATMFacilityMember_custom_AGPAllianceGlobalPartnersMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">1.6</ix:nonFraction></span> million related to those shares. A prospectus supplement
was filed on January 10, 2022 to allow the Company to sell an additional $<span id="xdx_905_ecustom--PaymentOfSalesCommission_pn5n6_c20210501__20220131__us-gaap--TypeOfArrangementAxis__custom--TwoThousandTwentyATMFacilityMember_zCFYS4sCujfi" title="Payment of sales commission"><ix:nonFraction name="OPTT:PaymentOfSalesCommission" contextRef="From2021-05-012022-01-31_custom_TwoThousandTwentyATMFacilityMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">25.0</ix:nonFraction></span> million (or an aggregate of $<span id="xdx_909_eus-gaap--SaleOfStockConsiderationReceivedPerTransaction_pn5n6_c20210501__20220131__us-gaap--TypeOfArrangementAxis__custom--TwoThousandTwentyATMFacilityMember_zciOEyO60asf"><ix:nonFraction name="us-gaap:SaleOfStockConsiderationReceivedPerTransaction" contextRef="From2021-05-012022-01-31_custom_TwoThousandTwentyATMFacilityMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">75.0</ix:nonFraction></span> million) under the 2020
ATM Facility, none of which has been sold to date.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Equity
Line Common Stock Purchase Agreements</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">On
October 24, 2019, the Company entered into a common stock purchase agreement with Aspire Capital which provided that, subject to certain
terms, conditions and limitations, Aspire Capital was committed to purchase up to an aggregate of $<span id="xdx_902_ecustom--StockIssuedDuringPeriodValueIssuedForCommitmentFee_pn5n6_c20191023__20191024__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember__srt--RangeAxis__srt--MaximumMember_zgtUWceEB0Q8" title="Aggregate purchase of common stock"><ix:nonFraction name="OPTT:StockIssuedDuringPeriodValueIssuedForCommitmentFee" contextRef="From2019-10-232019-10-24_custom_StockPurchaseAgreementMember_custom_AspireCapitalFundLLCMember_srt_MaximumMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">10.0</ix:nonFraction></span> million shares of the Company&#8217;s
common stock over a 30-month period. Through September 18, 2020, the Company had sold an aggregate of <span id="xdx_909_eus-gaap--SaleOfStockNumberOfSharesIssuedInTransaction_pid_c20200914__20200918__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_zJuEfYsjX7Fc" title="Number of common stock shares sold"><ix:nonFraction name="us-gaap:SaleOfStockNumberOfSharesIssuedInTransaction" contextRef="From2020-09-142020-09-18_custom_StockPurchaseAgreementMember_custom_AspireCapitalFundLLCMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">6,424,205</ix:nonFraction></span> shares of common stock
with an aggregate market value of $<span id="xdx_903_eus-gaap--SaleOfStockConsiderationReceivedPerTransaction_pn5n6_c20200914__20200918__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_zbAfuslQKKgl" title="Proceeds from issuance or sale of equity, net of issuance costs"><ix:nonFraction name="us-gaap:SaleOfStockConsiderationReceivedPerTransaction" contextRef="From2020-09-142020-09-18_custom_StockPurchaseAgreementMember_custom_AspireCapitalFundLLCMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">4.0</ix:nonFraction></span> million at an average price of $<span id="xdx_90A_eus-gaap--SaleOfStockPricePerShare_iI_pid_c20200918__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_z2PvKI00qNC4" title="Combined purchase price per share"><ix:nonFraction name="us-gaap:SaleOfStockPricePerShare" contextRef="AsOf2020-09-18_custom_StockPurchaseAgreementMember_custom_AspireCapitalFundLLCMember" format="ixt:numdotdecimal" decimals="INF" unitRef="USDPShares">0.63</ix:nonFraction></span> per share pursuant to this common stock purchase agreement,
including <span id="xdx_900_eus-gaap--SaleOfStockNumberOfSharesIssuedInTransaction_pid_c20200501__20210430__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementOneMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_zLzAqaMsuZMl" title="Number of common stock shares sold"><ix:nonFraction name="us-gaap:SaleOfStockNumberOfSharesIssuedInTransaction" contextRef="From2020-05-012021-04-30_custom_StockPurchaseAgreementOneMember_custom_AspireCapitalFundLLCMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">5,025,000</ix:nonFraction></span> shares in fiscal year 2021 with an aggregate market value of $<span id="xdx_902_eus-gaap--SaleOfStockConsiderationReceivedPerTransaction_pn5n6_c20200501__20210430__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementOneMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_zZ2rT7ofQ4hg" title="Proceeds from issuance or sale of equity, net of issuance costs"><ix:nonFraction name="us-gaap:SaleOfStockConsiderationReceivedPerTransaction" contextRef="From2020-05-012021-04-30_custom_StockPurchaseAgreementOneMember_custom_AspireCapitalFundLLCMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">2.9</ix:nonFraction></span> million at an average price of $<span id="xdx_909_eus-gaap--SaleOfStockPricePerShare_iI_pid_c20210430__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementOneMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_zpsbcKPZwiAi" title="Combined purchase price per share"><ix:nonFraction name="us-gaap:SaleOfStockPricePerShare" contextRef="AsOf2021-04-30_custom_StockPurchaseAgreementOneMember_custom_AspireCapitalFundLLCMember" format="ixt:numdotdecimal" decimals="INF" unitRef="USDPShares">0.57</ix:nonFraction></span> per share.
The agreement was fully utilized and terminated on September 18, 2020.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">On
September 18, 2020, the Company entered into a new common stock purchase agreement with Aspire Capital which provided that, subject to
certain terms, conditions and limitations, Aspire Capital was committed to purchase up to an aggregate of $<span id="xdx_90E_ecustom--StockIssuedDuringPeriodValueIssuedForCommitmentFee_pn5n6_c20200914__20200918__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_zvEikLWYvK4d" title="Aggregate purchase of common stock"><ix:nonFraction name="OPTT:StockIssuedDuringPeriodValueIssuedForCommitmentFee" contextRef="From2020-09-142020-09-18_custom_StockPurchaseAgreementMember_custom_AspireCapitalFundLLCMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">12.5</ix:nonFraction></span> million shares of the
Company&#8217;s common stock over a 30-month period subject to a limit of <span id="xdx_901_ecustom--PercentageOfOutstandingCommonStockLimitForShareholderApproval_pid_dp_uPure_c20200914__20200918__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_zAWYU80dtFy4" title="Percentage of outstanding common stock"><ix:nonFraction name="OPTT:PercentageOfOutstandingCommonStockLimitForShareholderApproval" contextRef="From2020-09-142020-09-18_custom_StockPurchaseAgreementMember_custom_AspireCapitalFundLLCMember" format="ixt:numdotdecimal" decimals="INF" scale="-2" unitRef="Pure">19.99</ix:nonFraction></span>% of the outstanding common stock on the date of the agreement
if the price did not exceed a specified price in the agreement. The number of shares the Company could issue within the 19.99% limit
was <span id="xdx_904_ecustom--StockIssuedDuringPeriodSharesCanBeIssuedBasedUponOutstandingPercentage_pid_c20200914__20200918__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_zZxo3TAECS3i" title="Shares can be issued based upon outstanding percentage"><ix:nonFraction name="OPTT:StockIssuedDuringPeriodSharesCanBeIssuedBasedUponOutstandingPercentage" contextRef="From2020-09-142020-09-18_custom_StockPurchaseAgreementMember_custom_AspireCapitalFundLLCMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">3,722,251</ix:nonFraction></span> shares without shareholder approval. Shareholder approval was received at the Company&#8217;s annual meeting of shareholders
on December 23, 2020 for the sale of <span id="xdx_90E_ecustom--NumberOfAdditionalSharesThatCanBeIssuedUponShareholderApproval_pid_c20201222__20201223__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_zw4qynmfrBfi" title="Additional sales of common stock shares sold"><ix:nonFraction name="OPTT:NumberOfAdditionalSharesThatCanBeIssuedUponShareholderApproval" contextRef="From2020-12-222020-12-23_custom_StockPurchaseAgreementMember_custom_AspireCapitalFundLLCMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">9,864,706</ix:nonFraction></span> additional shares of common stock to Aspire Capital, which exceeded the <span id="xdx_902_ecustom--PercentageOfOutstandingCommonStockLimitForShareholderApproval_pid_dp_uPure_c20201222__20201223__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_zSefBVri8Fj3" title="Percentage of outstanding common stock"><ix:nonFraction name="OPTT:PercentageOfOutstandingCommonStockLimitForShareholderApproval" contextRef="From2020-12-222020-12-23_custom_StockPurchaseAgreementMember_custom_AspireCapitalFundLLCMember" format="ixt:numdotdecimal" decimals="INF" scale="-2" unitRef="Pure">19.99</ix:nonFraction></span>% limit of
the outstanding common stock on the date of the agreement. Through January 31, 2022, the Company had sold an aggregate of <span id="xdx_902_eus-gaap--SaleOfStockNumberOfSharesIssuedInTransaction_c20210730__20210731__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_pdd" title="Number of common stock shares sold"><ix:nonFraction name="us-gaap:SaleOfStockNumberOfSharesIssuedInTransaction" contextRef="From2021-07-302021-07-31_custom_StockPurchaseAgreementMember_custom_AspireCapitalFundLLCMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">3,722,251</ix:nonFraction></span> shares
of common stock with an aggregate market value of $<span id="xdx_90D_eus-gaap--SaleOfStockConsiderationReceivedPerTransaction_c20210730__20210731__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_pn5n6" title="Proceeds from issuance or sale of equity, net of issuance costs"><ix:nonFraction name="us-gaap:SaleOfStockConsiderationReceivedPerTransaction" contextRef="From2021-07-302021-07-31_custom_StockPurchaseAgreementMember_custom_AspireCapitalFundLLCMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">11.8</ix:nonFraction></span> million at an average price of $<span id="xdx_904_eus-gaap--SaleOfStockPricePerShare_iI_pid_c20211031__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_zKVSQQxuzm59" title="Combined purchase price per share"><ix:nonFraction name="us-gaap:SaleOfStockPricePerShare" contextRef="AsOf2021-10-31_custom_StockPurchaseAgreementMember_custom_AspireCapitalFundLLCMember" format="ixt:numdotdecimal" decimals="INF" unitRef="USDPShares">3.17</ix:nonFraction></span> per share pursuant to this common stock
purchase agreement with approximately $<span id="xdx_905_eus-gaap--SaleOfStockConsiderationReceivedPerTransaction_pn5n6_c20220130__20220131__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_z5ObdanhfAy8" title="Proceeds from issuance or sale of equity, net of issuance costs"><ix:nonFraction name="us-gaap:SaleOfStockConsiderationReceivedPerTransaction" contextRef="From2022-01-302022-01-31_custom_StockPurchaseAgreementMember_custom_AspireCapitalFundLLCMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">1.0</ix:nonFraction></span> million remaining on the facility as of January 31, 2022.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

</ix:nonNumeric><ix:nonNumeric contextRef="From2021-05-01to2022-01-31" escape="true" name="us-gaap:SignificantAccountingPoliciesTextBlock"><p id="xdx_80C_eus-gaap--SignificantAccountingPoliciesTextBlock_zDdxXQXSsfD2" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(2)
<span id="xdx_82F_zJmLXtGm5CU2">Summary of Significant Accounting Policies</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<ix:nonNumeric contextRef="From2021-05-01to2022-01-31" escape="true" name="us-gaap:ConsolidationPolicyTextBlock"><p id="xdx_84C_eus-gaap--ConsolidationPolicyTextBlock_zBFiVSgwIaz9" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>(a)
<span id="xdx_865_zDBhF8X9gW9c">Consolidation</span></i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
accompanying consolidated financial statements include the accounts of the Company and its majority-owned subsidiaries. All significant
intercompany balances and transactions have been eliminated in consolidation.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

</ix:nonNumeric><ix:nonNumeric contextRef="From2021-05-01to2022-01-31" escape="true" name="us-gaap:UseOfEstimates"><p id="xdx_841_eus-gaap--UseOfEstimates_z7LQTREayaS5" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>(b)
<span id="xdx_86A_zL8LNwapiU0c">Use of Estimates</span></i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
preparation of the consolidated financial statements requires management of the Company to make a number of estimates and assumptions
relating to the reported amounts of assets and liabilities at the date of the consolidated financial statements and the reported amounts
of revenues and expenses during the period. Significant items subject to such estimates and assumptions include, among other items, valuations,
purchase price allocations and contingent consideration related to business combinations, expected future cash flows including growth
rates, discount rates, terminal values and other assumptions and estimates used to evaluate the recoverability of long-lived assets,
goodwill and other intangible assets and the related amortization methods and periods, estimated costs to complete projects and percentage
of completion of customer contracts for purposes of revenue recognition. Actual results could differ from those estimates.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"></p>

<ix:exclude><!-- Field: Page; Sequence: 10; Value: 2 -->
    <div style="border-bottom: Black 1.5pt solid; margin-bottom: 6pt"><table cellpadding="0" cellspacing="0" style="border-collapse: collapse; width: 100%; font-size: 10pt"><tr style="vertical-align: top; text-align: left"><td style="text-align: center; width: 100%"><!-- Field: Sequence; Type: Arabic; Name: PageNo -->10<!-- Field: /Sequence --></td></tr></table></div>
    <div style="break-before: page; margin-top: 6pt"><table cellpadding="0" cellspacing="0" style="border-collapse: collapse; width: 100%; font-size: 10pt"><tr style="vertical-align: top; text-align: left"><td style="width: 100%"><a href="#toc_001">Table of Contents</a></td></tr></table></div>
    <!-- Field: /Page --></ix:exclude>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

</ix:nonNumeric><ix:nonNumeric contextRef="From2021-05-01to2022-01-31" escape="true" name="us-gaap:CashAndCashEquivalentsRestrictedCashAndCashEquivalentsPolicy"><p id="xdx_84A_eus-gaap--CashAndCashEquivalentsRestrictedCashAndCashEquivalentsPolicy_zN4kSXA5PL1d" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>(c)
<span id="xdx_865_zh6i9EThGaZ2">Cash, Cash Equivalents, Restricted Cash and Security Agreements</span></i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Cash
and Cash Equivalents</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company considers all highly liquid investments with a maturity of three months or less when purchased to be cash equivalents. The Company
invests excess cash in a money market account. The following table summarizes cash and cash equivalents as of January 31, 2022 and April
30, 2021:</span></p>

<ix:nonNumeric contextRef="From2021-05-01to2022-01-31" escape="true" name="us-gaap:ScheduleOfCashAndCashEquivalentsTableTextBlock"><p id="xdx_893_eus-gaap--ScheduleOfCashAndCashEquivalentsTableTextBlock_z1g40OImlpYg" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;<span id="xdx_8BC_zp9nKkjhsHHl" style="display: none">Schedule of Cash and Cash Equivalents</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">January
    31, 2022</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">April
    30, 2021</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="6" style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(in
    thousands)</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 64%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Checking
    and savings accounts</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td id="xdx_98E_eus-gaap--CashAndCashEquivalentsAtCarryingValue_c20220131__us-gaap--CashAndCashEquivalentsAxis__custom--CheckingAndSavingsAccountsMember_pn3n3" title="Cash and cash equivalents" style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:CashAndCashEquivalentsAtCarryingValue" contextRef="AsOf2022-01-31_custom_CheckingAndSavingsAccountsMember" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">1,519</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td id="xdx_98D_eus-gaap--CashAndCashEquivalentsAtCarryingValue_c20210430__us-gaap--CashAndCashEquivalentsAxis__custom--CheckingAndSavingsAccountsMember_pn3n3" title="Cash and cash equivalents" style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:CashAndCashEquivalentsAtCarryingValue" contextRef="AsOf2021-04-30_custom_CheckingAndSavingsAccountsMember" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">1,850</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Money
    market account</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td id="xdx_988_eus-gaap--CashAndCashEquivalentsAtCarryingValue_c20220131__us-gaap--CashAndCashEquivalentsAxis__us-gaap--MoneyMarketFundsMember_pn3n3" title="Cash and cash equivalents" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:CashAndCashEquivalentsAtCarryingValue" contextRef="AsOf2022-01-31_us-gaap_MoneyMarketFundsMember" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">61,935</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td id="xdx_989_eus-gaap--CashAndCashEquivalentsAtCarryingValue_c20210430__us-gaap--CashAndCashEquivalentsAxis__us-gaap--MoneyMarketFundsMember_pn3n3" title="Cash and cash equivalents" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:CashAndCashEquivalentsAtCarryingValue" contextRef="AsOf2021-04-30_us-gaap_MoneyMarketFundsMember" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">81,178</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td id="xdx_982_eus-gaap--CashAndCashEquivalentsAtCarryingValue_c20220131_pn3n3" title="Cash and cash equivalents" style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:CashAndCashEquivalentsAtCarryingValue" contextRef="AsOf2022-01-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">63,454</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td id="xdx_98E_eus-gaap--CashAndCashEquivalentsAtCarryingValue_c20210430_pn3n3" title="Cash and cash equivalents" style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:CashAndCashEquivalentsAtCarryingValue" contextRef="AsOf2021-04-30" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">83,028</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  </table>

</ix:nonNumeric><p id="xdx_8AA_zetvsuuSeyZf" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Restricted
Cash and Security Agreements</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company has a letter of credit agreement with Santander Bank, N.A. (&#8220;Santander&#8221;). Cash of $<span id="xdx_90E_eus-gaap--Deposits_c20220131__us-gaap--TypeOfArrangementAxis__custom--RestrictedCashAndSecurityAgreementsMember__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--SantanderBankMember__us-gaap--ShortTermDebtTypeAxis__us-gaap--LetterOfCreditMember_pp0p0" title="Deposits"><ix:nonFraction name="us-gaap:Deposits" contextRef="AsOf2022-01-31_custom_RestrictedCashAndSecurityAgreementsMember_custom_SantanderBankMember_us-gaap_LetterOfCreditMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">157,000</ix:nonFraction></span> is on deposit at Santander
and serves as security for a letter of credit issued by Santander for the lease of warehouse/office space in Monroe Township, New Jersey.
This agreement cannot be extended beyond July 31, 2025 and is cancellable at the discretion of Santander.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Santander
also issued two letters of credit to subsidiaries of Enel Green Power (&#8220;EGP&#8221;) pursuant to the Company&#8217;s contracts with
EGP. The first letter of credit was issued in the amount of $<span id="xdx_906_eus-gaap--LettersOfCreditOutstandingAmount_c20220131__us-gaap--TypeOfArrangementAxis__custom--RestrictedCashAndSecurityAgreementsMember__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--SantanderBankMember__us-gaap--ShortTermDebtTypeAxis__custom--LetterOneMember_pp0p0"><ix:nonFraction name="us-gaap:LettersOfCreditOutstandingAmount" contextRef="AsOf2022-01-31_custom_RestrictedCashAndSecurityAgreementsMember_custom_SantanderBankMember_custom_LetterOneMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">126,000</ix:nonFraction>
</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">that will be released 12 months after the PB3
PowerBuoy<sup>&#174; </sup>(&#8220;PB3&#8221;) is fully deployed. The second letter of credit was issued in the amount of $<span id="xdx_90C_eus-gaap--LettersOfCreditOutstandingAmount_c20220131__us-gaap--TypeOfArrangementAxis__custom--RestrictedCashAndSecurityAgreementsMember__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--SantanderBankMember__us-gaap--ShortTermDebtTypeAxis__custom--LetterTwoMember_pp0p0"><ix:nonFraction name="us-gaap:LettersOfCreditOutstandingAmount" contextRef="AsOf2022-01-31_custom_RestrictedCashAndSecurityAgreementsMember_custom_SantanderBankMember_custom_LetterTwoMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">645,000</ix:nonFraction>
</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">and was reduced to $<span id="xdx_908_eus-gaap--LettersOfCreditOutstandingAmount_c20200831__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--SantanderBankMember__us-gaap--ShortTermDebtTypeAxis__custom--LetterTwoMember__us-gaap--AwardDateAxis__custom--AugustTwentyTwentyMember_pp0p0"><ix:nonFraction name="us-gaap:LettersOfCreditOutstandingAmount" contextRef="AsOf2020-08-31_custom_SantanderBankMember_custom_LetterTwoMember_custom_AugustTwentyTwentyMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">323,000</ix:nonFraction>
</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">in August 2020. The second letter of credit will
be reduced by $<span id="xdx_900_ecustom--LettersOfCreditIssuedAmount_iI_pp0p0_c20220131__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--SantanderBankMember__us-gaap--ShortTermDebtTypeAxis__custom--LetterTwoMember_zBZcN1vaN5D3" title="Letters of credit issued amount"><ix:nonFraction name="OPTT:LettersOfCreditIssuedAmount" contextRef="AsOf2022-01-31_custom_SantanderBankMember_custom_LetterTwoMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">259,000</ix:nonFraction>
</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">once the PB3 is fully deployed and passes
final acceptance testing. The remaining restricted amount of $<span id="xdx_901_ecustom--LettersOfCreditIssuedAmount_iI_pp0p0_c20220131__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--SantanderBankMember_zY2nQsgGT38a" title="Letters of credit issued amount"><ix:nonFraction name="OPTT:LettersOfCreditIssuedAmount" contextRef="AsOf2022-01-31_custom_SantanderBankMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">64,000</ix:nonFraction>
</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">will be released 12 months after the buoy
is fully deployed.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<ix:nonNumeric contextRef="From2021-05-01to2022-01-31" escape="true" name="us-gaap:ScheduleOfRestrictedCashAndCashEquivalentsTextBlock"><p id="xdx_89F_eus-gaap--ScheduleOfRestrictedCashAndCashEquivalentsTextBlock_zFgX8DyXBl54" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
following table provides a reconciliation of cash, cash equivalents and restricted cash reported within the Consolidated Balance Sheets
that total to the same amounts shown in the Consolidated Statements of Cash Flows.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;<span id="xdx_8B1_zzRbhmGQtXKi" style="display: none">Schedule of Cash and Cash Equivalents and Restricted Cash</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
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    31, 2022</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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    30, 2021</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="6" style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(in
    thousands)</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_40E_eus-gaap--CashAndCashEquivalentsAtCarryingValue_iI_pn3n3" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
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    and cash equivalents</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:CashAndCashEquivalentsAtCarryingValue" contextRef="AsOf2022-01-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">63,454</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:CashAndCashEquivalentsAtCarryingValue" contextRef="AsOf2021-04-30" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">83,028</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_401_eus-gaap--RestrictedCashCurrent_iI_pn3n3" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Restricted
    cash- short term</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:RestrictedCashCurrent" contextRef="AsOf2022-01-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">384</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:RestrictedCashCurrent" contextRef="AsOf2021-04-30" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">384</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_40F_eus-gaap--RestrictedCashNoncurrent_iI_pn3n3" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Restricted
    cash- long term</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:RestrictedCashNoncurrent" contextRef="AsOf2022-01-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">222</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:RestrictedCashNoncurrent" contextRef="AsOf2021-04-30" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">222</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_40B_eus-gaap--CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_iI_pn3n3" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="display: none; font-family: Times New Roman, Times, Serif; font-size: 10pt">Cash,
    cash equivalents and restricted cash</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" contextRef="AsOf2022-01-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">64,060</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" contextRef="AsOf2021-04-30" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">83,634</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  </table>

</ix:nonNumeric><p id="xdx_8A8_ztfYL56COu66" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

</ix:nonNumeric><ix:nonNumeric contextRef="From2021-05-01to2022-01-31" escape="true" name="us-gaap:ConcentrationRiskCreditRisk"><p id="xdx_841_eus-gaap--ConcentrationRiskCreditRisk_zLv29a9Vu6D1" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>(d)
<span id="xdx_860_zscMqxtILrm2">Concentration of Credit Risk</span></i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Financial
instruments that potentially subject the Company to credit risk consist principally of accounts receivable and cash and cash equivalents.
The Company believes that its current contracts do not represent a risk of collectability on its receivables. The Company invests its
excess cash in a money market account and does not believe that it is exposed to any significant risks related to its cash and money
market accounts. Cash and cash equivalents are also maintained at foreign financial institutions. Cash and cash equivalents in foreign
financial institutions as of January 31, 2022 was $<span id="xdx_901_eus-gaap--CashAndCashEquivalentsAtCarryingValue_c20220131__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--ForeignFinancialInstitutionsMember_pp0p0" title="Cash and Cash Equivalents, at Carrying Value"><ix:nonFraction name="us-gaap:CashAndCashEquivalentsAtCarryingValue" contextRef="AsOf2022-01-31_custom_ForeignFinancialInstitutionsMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">30,000</ix:nonFraction></span>.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"></p>

<ix:exclude><!-- Field: Page; Sequence: 11; Value: 2 -->
    <div style="border-bottom: Black 1.5pt solid; margin-bottom: 6pt"><table cellpadding="0" cellspacing="0" style="border-collapse: collapse; width: 100%; font-size: 10pt"><tr style="vertical-align: top; text-align: left"><td style="text-align: center; width: 100%"><!-- Field: Sequence; Type: Arabic; Name: PageNo -->11<!-- Field: /Sequence --></td></tr></table></div>
    <div style="break-before: page; margin-top: 6pt"><table cellpadding="0" cellspacing="0" style="border-collapse: collapse; width: 100%; font-size: 10pt"><tr style="vertical-align: top; text-align: left"><td style="width: 100%"><a href="#toc_001">Table of Contents</a></td></tr></table></div>
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<ix:nonNumeric contextRef="From2021-05-01to2022-01-31" escape="true" name="us-gaap:ScheduleOfRevenueByMajorCustomersByReportingSegmentsTableTextBlock"><p id="xdx_896_eus-gaap--ScheduleOfRevenueByMajorCustomersByReportingSegmentsTableTextBlock_zE4Zaw2bCATl" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
table below shows the amount of the Company&#8217;s revenues derived from customers whose revenues accounted for at least 10% of the
Company&#8217;s consolidated revenues for at least one of the periods indicated:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;<span id="xdx_8BF_zpKS8GyJEw06" style="display: none">Schedule of Revenue by Major Customers by Reporting Segments</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="font: 10pt Times New Roman, Times, Serif; display: none; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" id="xdx_490_20211101__20220131_ze45TaeFeBRj" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">2022</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" id="xdx_493_20201101__20210131_zmg6Jp1On4D9" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">2021</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" id="xdx_49C_20210501__20220131_zj0XbYPKsZuj" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">2022</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" id="xdx_494_20200501__20210131_zvNGSdxep4g5" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">2021</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="6" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Three
    months ended January 31,</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="6" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Nine
    months ended January 31,</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">2022</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">2021</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">2022</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">2021</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="6" style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(in
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    <td colspan="6" style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(in
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  <tr id="xdx_408_eus-gaap--RevenueFromContractWithCustomerExcludingAssessedTax_pn3n3_hus-gaap--ConcentrationRiskByBenchmarkAxis__us-gaap--SalesRevenueNetMember__us-gaap--ConcentrationRiskByTypeAxis__us-gaap--CustomerConcentrationRiskMember__srt--MajorCustomersAxis__custom--EniSPAMember_zki3jOC14VUc" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 36%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Eni
    S.p.A.</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 12%; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span style="-sec-ix-hidden: xdx2ixbrl1017">&#8212;</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 12%; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax" contextRef="From2020-11-012021-01-31_us-gaap_SalesRevenueNetMember_us-gaap_CustomerConcentrationRiskMember_custom_EniSPAMember" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">34</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 12%; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax" contextRef="From2021-05-012022-01-31_us-gaap_SalesRevenueNetMember_us-gaap_CustomerConcentrationRiskMember_custom_EniSPAMember" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">14</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 12%; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax" contextRef="From2020-05-012021-01-31_us-gaap_SalesRevenueNetMember_us-gaap_CustomerConcentrationRiskMember_custom_EniSPAMember" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">135</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_403_eus-gaap--RevenueFromContractWithCustomerExcludingAssessedTax_pn3n3_hus-gaap--ConcentrationRiskByBenchmarkAxis__us-gaap--SalesRevenueNetMember__us-gaap--ConcentrationRiskByTypeAxis__us-gaap--CustomerConcentrationRiskMember__srt--MajorCustomersAxis__custom--DepartmentOfEnergyMember_zj3dzoPzdQ4e" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Department
    of Energy</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax" contextRef="From2021-11-012022-01-31_us-gaap_SalesRevenueNetMember_us-gaap_CustomerConcentrationRiskMember_custom_DepartmentOfEnergyMember" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">102</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span style="-sec-ix-hidden: xdx2ixbrl1023">&#8212;</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax" contextRef="From2021-05-012022-01-31_us-gaap_SalesRevenueNetMember_us-gaap_CustomerConcentrationRiskMember_custom_DepartmentOfEnergyMember" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">182</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span style="-sec-ix-hidden: xdx2ixbrl1025">&#8212;</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_402_eus-gaap--RevenueFromContractWithCustomerExcludingAssessedTax_pn3n3_hus-gaap--ConcentrationRiskByBenchmarkAxis__us-gaap--SalesRevenueNetMember__us-gaap--ConcentrationRiskByTypeAxis__us-gaap--CustomerConcentrationRiskMember__srt--MajorCustomersAxis__custom--EGPMember_zajw0pFUuPlk" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">EGP</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span style="-sec-ix-hidden: xdx2ixbrl1027">&#8212;</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax" contextRef="From2020-11-012021-01-31_us-gaap_SalesRevenueNetMember_us-gaap_CustomerConcentrationRiskMember_custom_EGPMember" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">223</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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  <tr id="xdx_406_eus-gaap--RevenueFromContractWithCustomerExcludingAssessedTax_pn3n3_hus-gaap--ConcentrationRiskByBenchmarkAxis__us-gaap--SalesRevenueNetMember__us-gaap--ConcentrationRiskByTypeAxis__us-gaap--CustomerConcentrationRiskMember__srt--MajorCustomersAxis__custom--ACETMember_zGXHpKdgpmu2" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">ACET</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span style="-sec-ix-hidden: xdx2ixbrl1032">&#8212;</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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  <tr id="xdx_405_eus-gaap--RevenueFromContractWithCustomerExcludingAssessedTax_pn3n3_hus-gaap--ConcentrationRiskByBenchmarkAxis__us-gaap--SalesRevenueNetMember__us-gaap--ConcentrationRiskByTypeAxis__us-gaap--CustomerConcentrationRiskMember__srt--MajorCustomersAxis__custom--BrighamYoungUniversityMember_zB91P7eS4Nll" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
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  <tr id="xdx_407_eus-gaap--RevenueFromContractWithCustomerExcludingAssessedTax_pn3n3_hus-gaap--ConcentrationRiskByBenchmarkAxis__us-gaap--SalesRevenueNetMember__us-gaap--ConcentrationRiskByTypeAxis__us-gaap--CustomerConcentrationRiskMember__srt--MajorCustomersAxis__custom--NipponKaiyoMember_zB2to4fwMr6e" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
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  <tr id="xdx_40A_eus-gaap--RevenueFromContractWithCustomerExcludingAssessedTax_pn3n3_hus-gaap--ConcentrationRiskByBenchmarkAxis__us-gaap--SalesRevenueNetMember__us-gaap--ConcentrationRiskByTypeAxis__us-gaap--CustomerConcentrationRiskMember__srt--MajorCustomersAxis__custom--NavalSurfaceWarfareCenterMember_zlqYIer8uzHa" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<table cellspacing="0" cellpadding="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif; padding-right: 2.65pt; text-align: right; width: 40%"><span id="xdx_F04_zZURkolW8eg4" style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(1)</span></td>
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    related consulting</ix:footnote></span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: #CCEEFF">
    <td style="font: 10pt Times New Roman, Times, Serif; padding-right: 2.65pt; text-align: right"><span id="xdx_F0C_ztPx7WLQvE09" style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(2)</span></td>
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  </table>
</ix:nonNumeric><p id="xdx_8A2_zpoEBfu5dakd" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>&#160;</b></span></p>

</ix:nonNumeric><ix:nonNumeric contextRef="From2021-05-01to2022-01-31" escape="true" name="us-gaap:ShareBasedCompensationOptionAndIncentivePlansPolicy"><p id="xdx_849_eus-gaap--ShareBasedCompensationOptionAndIncentivePlansPolicy_zuPdUUyPHCpd" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>(e)
<span id="xdx_86E_zrwZKoyPUhQ5">Share-Based Compensation</span></i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Costs
resulting from all share-based payment transactions are recognized in the consolidated financial statements at their fair values. The
following table summarizes share-based compensation related to the Company&#8217;s share-based plans by expense category for the three
and nine months ended January 31, 2022 and 2021:</span></p>

<ix:nonNumeric contextRef="From2021-05-01to2022-01-31" escape="true" name="us-gaap:ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock"><p id="xdx_89D_eus-gaap--ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock_zD5DdwwOJ1E2" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;<span id="xdx_8BF_z6z14Asmywua" style="display: none">Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
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<tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
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    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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  <tr id="xdx_408_eus-gaap--ShareBasedCompensation_hus-gaap--IncomeStatementLocationAxis__custom--EngineeringAndProductDevelopmentMember_zHoaC2eo4ba1" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
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    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 12%; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:ShareBasedCompensation" contextRef="From2021-05-012022-01-31_custom_EngineeringAndProductDevelopmentMember" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">551</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:ShareBasedCompensation" contextRef="From2021-05-012022-01-31_us-gaap_SellingGeneralAndAdministrativeExpensesMember" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">313</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:ShareBasedCompensation" contextRef="From2020-05-012021-01-31_us-gaap_SellingGeneralAndAdministrativeExpensesMember" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">247</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
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  </table>

</ix:nonNumeric><p id="xdx_8AE_zUTay3HR9Vs4" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

</ix:nonNumeric><ix:nonNumeric contextRef="From2021-05-01to2022-01-31" escape="true" name="us-gaap:RevenueFromContractWithCustomerPolicyTextBlock"><p id="xdx_844_eus-gaap--RevenueFromContractWithCustomerPolicyTextBlock_zrwrCS2Zd6D7" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(f)
<i><span id="xdx_869_z0nOgDU7qY93">Revenue Recognition</span></i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">A
performance obligation is the unit of account for revenue recognition. The Company assesses the goods or services promised in a contract
with a customer and identifies as a performance obligation either: a) a good or service (or a bundle of goods or services) that is distinct;
or b) a series of distinct goods or services that are substantially the same and that have the same pattern of transfer to the customer.
A contract may contain a single or multiple performance obligations. For contracts with multiple performance obligations, the Company
allocates the contracted transaction price to each performance obligation based upon the relative standalone selling price, which represents
the price the Company would sell a promised good or service separately to a customer. The Company determines the standalone selling price
based upon the facts and circumstances of each obligated good or service. The majority of the Company&#8217;s contracts have no observable
standalone selling price since the associated products and services are customized to customer specifications. As such, the standalone
selling price generally reflects the Company&#8217;s forecast of the total cost to satisfy the performance obligation plus an appropriate
profit margin.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
nature of the Company&#8217;s contracts may give rise to several types of variable consideration, including unpriced change orders and
liquidated damages and penalties. Variable consideration can also arise from modifications to the scope of services. Variable consideration
is included in the transaction price to the extent it is probable that a significant reversal of cumulative revenue recognized will not
occur once the uncertainty associated with the variable consideration is resolved. Our estimates of variable consideration and determination
of whether to include such amounts in the transaction price are based largely on our assessment of legal enforceability, performance,
and any other information (historical, current, and forecasted) that is reasonably available to us. There was no variable consideration
as of January 31, 2022 or 2021. The Company presents shipping and handling costs, that occur after control of the promised goods or services
transfer to the customer, as fulfillment costs rather than evaluating whether the shipping and handling activities are promised services
to the customer.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"></p>

<ix:exclude><!-- Field: Page; Sequence: 12; Value: 2 -->
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    <div style="break-before: page; margin-top: 6pt"><table cellpadding="0" cellspacing="0" style="border-collapse: collapse; width: 100%; font-size: 10pt"><tr style="vertical-align: top; text-align: left"><td style="width: 100%"><a href="#toc_001">Table of Contents</a></td></tr></table></div>
    <!-- Field: /Page --></ix:exclude>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company recognizes revenue when or as it satisfies a performance obligation by transferring a good or service to a customer, either (1)
at a point in time or (2) over time. A good or service is transferred when, or as, the customer obtains control. The evaluation of whether
control of each performance obligation is transferred at a point in time or over time is made at contract inception. Input measures such
as costs incurred or time elapsed are utilized to assess progress against specific contractual performance obligations for the Company&#8217;s
services. The selection of the method to measure progress towards completion requires judgment and is based on the nature of the services
to be provided. For the Company, the input method using costs incurred or time elapsed best represents the measure of progress against
the performance obligations incorporated within the contractual agreements. If estimated total costs on any contract project a loss,
the Company charges the entire estimated loss to operations in the period the loss becomes known. The cumulative effect of revisions
to revenue, estimated costs to complete contracts, including penalties, incentive awards, change orders, claims, anticipated losses,
and others are recorded in the accounting period in which the events indicating a loss are known and the loss can be reasonably estimated.
These loss projects are re-assessed for each subsequent reporting period until the project is complete. Such revisions could occur at
any time and the effects may be material.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company&#8217;s contracts are either cost plus or fixed price contracts. Under cost plus contracts, customers are billed for actual expenses
incurred plus an agreed-upon fee. Under cost plus contracts, a profit or loss on a project is recognized depending on whether actual
costs are more or less than the agreed upon amount.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company has two types of fixed price contracts, firm fixed price and cost-sharing. Under firm fixed price contracts, the Company receives
an agreed-upon amount for providing products and services specified in the contract, and a profit or loss is recognized depending on
whether actual costs are more or less than the agreed upon amount. Under cost-sharing contracts, the fixed amount agreed upon with the
customer is only intended to fund a portion of the costs on a specific project. Under cost sharing contracts, an amount corresponding
to the revenue is recorded in cost of revenues, resulting in gross profit on these contracts of zero. The Company&#8217;s share of the
costs is recorded as product development expense. The Company reports its disaggregation of revenue by contract type since this method
best represents the Company&#8217;s business. For the nine-month periods ended January 31, 2022 and 2021, all of the Company&#8217;s
contracts were classified as firm fixed price.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">As
of January 31, 2022, the Company&#8217;s total remaining performance obligations, also referred to as backlog, totaled $<span id="xdx_908_eus-gaap--RevenueRemainingPerformanceObligation_iI_pn5n6_c20220131_zPQxAxDAE4c2" title="Revenue remaining performance obligation"><ix:nonFraction name="us-gaap:RevenueRemainingPerformanceObligation" contextRef="AsOf2022-01-31" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">0.8</ix:nonFraction></span> million.
The Company expects to recognize <span id="xdx_900_ecustom--RevenueRemainingPerformancesObligationPercentage_pid_dp_uPure_c20210501__20220131_zLCFe6fEpFU8" title="Revenue remaining performance obligation, percentage"><ix:nonFraction name="OPTT:RevenueRemainingPerformancesObligationPercentage" contextRef="From2021-05-01to2022-01-31" format="ixt:numdotdecimal" decimals="INF" scale="-2" unitRef="Pure">100</ix:nonFraction></span>% of the remaining performance obligations as revenue over the next twelve months.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company also enters into lease arrangements for its PB3 and our Wave Adaptive Modular Vessels (&#8220;WAM-V&#8221;) with certain customers.
Revenue related to multiple-element arrangements is allocated to lease and non-lease elements based on their relative standalone selling
prices or expected cost plus a margin approach. Lease elements generally include a PB3 and components, while non-lease elements generally
include engineering, monitoring and support services. In the lease arrangement, the customer is provided an option to extend the lease
term or purchase the leased PB3 at some point during and/or at the end of the lease term.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Products
and Solutions Leasing</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company enters into lease arrangements with certain customers for their products and solutions. As of January 31, 2022, the Company had
one lease arrangement with a remaining operating lease term of less than 7 months. Revenue related to multiple-element arrangements is
allocated to lease and non-lease elements based on their relative standalone selling prices or expected cost plus a margin approach.
Lease elements generally include a PB3 and components, while non-lease elements generally include engineering, monitoring and support
services. In the lease arrangement, the customer is provided an option to extend the lease term or purchase the leased PB3 at some point
during and/or at the end of the lease term.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"></p>

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    <div style="break-before: page; margin-top: 6pt"><table cellpadding="0" cellspacing="0" style="border-collapse: collapse; width: 100%; font-size: 10pt"><tr style="vertical-align: top; text-align: left"><td style="width: 100%"><a href="#toc_001">Table of Contents</a></td></tr></table></div>
    <!-- Field: /Page --></ix:exclude>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company classifies leases as either operating or financing in accordance with the authoritative accounting guidance contained within
ASC Topic 842, <i>&#8220;Leases&#8221;.</i> At inception of the contract, the Company evaluates the lease against the lease classification
criteria within ASC Topic 842. If the direct financing or sales-type classification criteria are met, then the lease is accounted for
as a finance lease. All other leases are treated as operating leases.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company recognizes revenue from operating lease arrangements generally on a straight-line basis over the lease term which is presented
in Revenues in the Consolidated Statements of Operations. The lease revenue for the nine months ended January 31, 2022 and 2021 was immaterial.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

</ix:nonNumeric><ix:nonNumeric contextRef="From2021-05-01to2022-01-31" escape="true" name="us-gaap:EarningsPerSharePolicyTextBlock"><p id="xdx_84E_eus-gaap--EarningsPerSharePolicyTextBlock_zZvX1ipIWb21" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>(g)
<span id="xdx_868_znU2KJI53lPd">Net Loss per Common Share</span></i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Basic
and diluted net loss per common share for all periods presented is computed by dividing net loss by the weighted average number of shares
of common stock and common stock equivalents outstanding during the periods. The pre-funded warrants were determined to be common stock
equivalents and have been included in the weighted average number of shares outstanding for calculation of basic net loss per common
share . Due to the Company&#8217;s net losses, potentially dilutive securities, consisting of options to purchase shares of common stock,
warrants on common stock and unvested restricted stock issued to employees and non-employee directors, were excluded from the diluted
net loss per common share calculation due to their anti-dilutive effect.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">In
computing diluted net loss per common share on the Consolidated Statements of Operations, warrants exercisable for common stock, options
to purchase shares of common stock and non-vested restricted stock issued to employees and non-employee directors, totaling <span id="xdx_909_eus-gaap--AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_c20210501__20220131_pdd" title="Antidilutive securities excluded from computation of earnings per share, amount"><ix:nonFraction name="us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount" contextRef="From2021-05-01to2022-01-31" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">6,356,123</ix:nonFraction></span>
and <span id="xdx_90F_eus-gaap--AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_c20200501__20210131_pdd" title="Antidilutive securities excluded from computation of earnings per share, amount"><ix:nonFraction name="us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount" contextRef="From2020-05-012021-01-31" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">5,221,258</ix:nonFraction></span> for the nine months ended January 31, 2022 and 2021, respectively, were excluded from each of the computations as the effect
would be anti-dilutive due to the Company&#8217;s net losses.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

</ix:nonNumeric><ix:nonNumeric contextRef="From2021-05-01to2022-01-31" escape="true" name="us-gaap:NewAccountingPronouncementsPolicyPolicyTextBlock"><p id="xdx_84E_eus-gaap--NewAccountingPronouncementsPolicyPolicyTextBlock_zjFZOjb69SVc" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>(h)
<span id="xdx_867_zg3Bffmmat3d">Recently Issued Accounting Standards</span></i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">In
June 2016, the Financial Accounting Standards Board (&#8220;FASB&#8221;) issued ASU No. 2016-13, &#8220;<i>Financial Instruments </i>-
<i>Credit Losses (Topic 326), Measurement of Credit Losses on Financial Instruments.&#8221; </i>This amendment replaces the incurred
loss impairment methodology in current GAAP with a methodology that reflects expected credit losses on instruments within its scope,
including trade receivables. This update is intended to provide financial statement users with more decision-useful information about
the expected credit losses. In November 2019, the FASB issued No. 2019-10, <i>Financial Instruments&#8212;Credit Losses (Topic 326),
Derivatives and Hedging (Topic 815), and Leases (Topic 842)</i>, which deferred the effective date of ASU 2016-13 for Smaller Reporting
Companies for fiscal years beginning after December 15, 2022, including interim periods within those fiscal years. The Company is
currently evaluating the impact of the adoption of ASU 2016-13 on its consolidated financial statements.</span></p>

</ix:nonNumeric><p id="xdx_853_zsQeUyeZ5Ko5" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

</ix:nonNumeric><ix:nonNumeric contextRef="From2021-05-01to2022-01-31" escape="true" name="OPTT:AccountReceivableContractAssetsAndContractLiabilitiesTextBlock"><p id="xdx_80B_ecustom--AccountReceivableContractAssetsAndContractLiabilitiesTextBlock_zkx9qyT015w4" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(3)
<span id="xdx_824_zVP50WQzirT3">Account Receivable and Contract Assets</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<ix:nonNumeric contextRef="From2021-05-01to2022-01-31" escape="true" name="OPTT:ScheduleOfAccountsReceivableContractAssetsAndContractLiabilitiesTableTextBlock"><p id="xdx_893_ecustom--ScheduleOfAccountsReceivableContractAssetsAndContractLiabilitiesTableTextBlock_zX37aYccAexj" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
following provides further details on the balance sheet accounts of accounts receivable and contract assets from contracts with customers:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;<span id="xdx_8B3_zG1WN85sW172" style="display: none">Schedule of Accounts Receivable, Contract Assets and Contract Liabilities</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" id="xdx_496_20220131_zbTa3kmusB2l" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">January
    31, 2022</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" id="xdx_490_20210430_zXcszjs8DfKj" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">April
    30, 2021</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="6" style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(in
    thousands)</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_401_eus-gaap--AccountsReceivableNetCurrent_iI_pn3n3" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 64%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Accounts
    receivable</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:AccountsReceivableNetCurrent" contextRef="AsOf2021-04-30" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">350</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_404_eus-gaap--ContractWithCustomerAssetNetCurrent_iI_pn3n3" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Contract
    assets</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:ContractWithCustomerAssetNetCurrent" contextRef="AsOf2022-01-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">407</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:ContractWithCustomerAssetNetCurrent" contextRef="AsOf2021-04-30" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">190</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_40F_eus-gaap--ContractWithCustomerLiabilityCurrent_iI_pn3n3" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Contract
    liabilities</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:ContractWithCustomerLiabilityCurrent" contextRef="AsOf2022-01-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">15</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span style="-sec-ix-hidden: xdx2ixbrl1113">&#8212;</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  </table>

</ix:nonNumeric><p id="xdx_8A3_z0tmZ0DjSym2" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>&#160;</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Accounts
Receivable</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company grants credit to its customers, generally without collateral, under normal payment terms (typically 30 to 60 days after invoicing).
Generally, invoicing occurs after the related services are performed or control of goods have transferred to the customer. Accounts receivable
represent an unconditional right to consideration arising from the Company&#8217;s performance under contracts with customers. The carrying
value of such receivables represents their estimated realizable value.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"></p>

<ix:exclude><!-- Field: Page; Sequence: 14; Value: 2 -->
    <div style="border-bottom: Black 1.5pt solid; margin-bottom: 6pt"><table cellpadding="0" cellspacing="0" style="border-collapse: collapse; width: 100%; font-size: 10pt"><tr style="vertical-align: top; text-align: left"><td style="text-align: center; width: 100%"><!-- Field: Sequence; Type: Arabic; Name: PageNo -->14<!-- Field: /Sequence --></td></tr></table></div>
    <div style="break-before: page; margin-top: 6pt"><table cellpadding="0" cellspacing="0" style="border-collapse: collapse; width: 100%; font-size: 10pt"><tr style="vertical-align: top; text-align: left"><td style="width: 100%"><a href="#toc_001">Table of Contents</a></td></tr></table></div>
    <!-- Field: /Page --></ix:exclude>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Contract
Assets</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Contract
assets include unbilled amounts typically resulting from arrangements whereby the right to payment is conditioned on completing additional
tasks or services for a performance obligation. Significant changes in the contract assets balance during the period were as follows:</span></p>

<ix:nonNumeric contextRef="From2021-05-01to2022-01-31" escape="true" name="us-gaap:ContractWithCustomerAssetAndLiabilityTableTextBlock"><p id="xdx_895_eus-gaap--ContractWithCustomerAssetAndLiabilityTableTextBlock_zu9tO89eHz01" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;<span id="xdx_8BC_zY5tgvGeojuj" style="display: none">Schedule of Significant Changes in Contract Assets and Contract Liabilities</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" id="xdx_498_20210501__20220131_zwQ2ZRbPzNdl" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Nine
    months ended January 31, 2022</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(in
    thousands)</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_406_eus-gaap--ContractWithCustomerAssetNet_iNS_pn3n3_di_zRWeyQ6sTHa2" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 78%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Transferred
    to receivables from contract assets recognized at the beginning of the period</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 18%; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(<ix:nonFraction name="us-gaap:ContractWithCustomerAssetNet" contextRef="AsOf2021-04-30" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">190</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">)</span></td></tr>
  <tr id="xdx_40A_eus-gaap--ContractWithCustomerAssetNet_iE_pn3n3_zSo6j0097m1c" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Revenue
    recognized and not billed as of the end of the period</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:ContractWithCustomerAssetNet" contextRef="AsOf2022-01-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">407</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_401_eus-gaap--IncreaseDecreaseInContractWithCustomerAsset_iT_pn3n3_zsLykBp0ml1h" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Net
    change in contract assets</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:IncreaseDecreaseInContractWithCustomerAsset" contextRef="From2021-05-01to2022-01-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">217</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  </table>

</ix:nonNumeric><p id="xdx_8A2_z3gj4aGrrpEg" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

</ix:nonNumeric><ix:nonNumeric contextRef="From2021-05-01to2022-01-31" escape="true" name="us-gaap:OtherCurrentAssetsTextBlock"><p id="xdx_80E_eus-gaap--OtherCurrentAssetsTextBlock_zxbOhOnsA2tl" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(4)
<span id="xdx_82E_zWWy2HdMU7Qf">Other Current Assets</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>&#160;</b></span></p>

<ix:nonNumeric contextRef="From2021-05-01to2022-01-31" escape="true" name="us-gaap:ScheduleOfOtherCurrentAssetsTableTextBlock"><p id="xdx_894_eus-gaap--ScheduleOfOtherCurrentAssetsTableTextBlock_zOb9oIGBliWe" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Other
current assets consisted of the following at January 31, 2022 and April 30, 2021:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;<span id="xdx_8BE_zUQHnlgidtGh" style="display: none">Schedule of Other Current Assets</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" id="xdx_499_20220131_zyvdMlf294i6" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">January
    31, 2022</span></td><td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" id="xdx_49C_20210430_z7mboLLDyuFi" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">April
    30, 2021</span></td><td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="6" style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(in
    thousands)</span></td><td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_402_eus-gaap--PrepaidInsurance_iI_pn3n3_maOACz300_z2YxsIiPOxw3" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 64%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Prepaid
    insurance</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right">&#160;&#160;&#160;&#160;&#160;<span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:PrepaidInsurance" contextRef="AsOf2022-01-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">178</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right">&#160;&#160;&#160;&#160;&#160;<span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:PrepaidInsurance" contextRef="AsOf2021-04-30" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">194</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_40A_ecustom--PrepaidSoftwareAndLicenses_pn3n3_maOACz300_zwqT8UeANQWd" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Prepaid
    software &amp; licenses</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="OPTT:PrepaidSoftwareAndLicenses" contextRef="AsOf2022-01-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">84</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="OPTT:PrepaidSoftwareAndLicenses" contextRef="AsOf2021-04-30" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">93</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_40B_ecustom--PrepaidSalesAndMarketing_pn3n3_maOACz300_z6yjFlOmwoOk" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
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    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:DepositsAssetsCurrent" contextRef="AsOf2021-04-30" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">68</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
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</ix:nonNumeric><p id="xdx_8AE_z8L9gmvO25Pg" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

</ix:nonNumeric><ix:nonNumeric contextRef="From2021-05-01to2022-01-31" escape="true" name="us-gaap:PropertyPlantAndEquipmentDisclosureTextBlock"><p id="xdx_809_eus-gaap--PropertyPlantAndEquipmentDisclosureTextBlock_zoHgeImTxWsg" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(5)
<span id="xdx_825_zEsi0YOlGtvk">Property and Equipment, net</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<ix:nonNumeric contextRef="From2021-05-01to2022-01-31" escape="true" name="us-gaap:PropertyPlantAndEquipmentTextBlock"><p id="xdx_89B_eus-gaap--PropertyPlantAndEquipmentTextBlock_zkS29BFv5Ahj" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
components of property and equipment, net as of January 31, 2022 and April 30, 2021 consisted of the following:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;<span id="xdx_8BA_zQ9sv7Oqikt5" style="display: none">Schedule of Components of Property and Equipment</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
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  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
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  <tr id="xdx_40D_eus-gaap--PropertyPlantAndEquipmentGross_iI_pn3n3_hus-gaap--PropertyPlantAndEquipmentByTypeAxis__us-gaap--EquipmentMember_zQYinpXEifmh" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
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    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:PropertyPlantAndEquipmentGross" contextRef="AsOf2022-01-31_custom_OfficeFurnitureAndEquipmentMember" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">352</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:PropertyPlantAndEquipmentGross" contextRef="AsOf2021-04-30_custom_OfficeFurnitureAndEquipmentMember" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">341</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
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    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Leasehold
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    <td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt"><span style="display: none; font-family: Times New Roman, Times, Serif; font-size: 10pt">Property
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    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:PropertyPlantAndEquipmentNet" contextRef="AsOf2021-04-30" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">406</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  </table>

</ix:nonNumeric><p id="xdx_8A7_zX05log2E8hg" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Depreciation
expense was approximately $<span id="xdx_90D_eus-gaap--Depreciation_pn3n3_c20210501__20220131_zwhH3OsO1ep1" title="Depreciation expense"><ix:nonFraction name="us-gaap:Depreciation" contextRef="From2021-05-01to2022-01-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">104,000</ix:nonFraction></span> and $<span id="xdx_909_eus-gaap--Depreciation_pn3n3_c20200501__20210131_zTtgmcnN90v1" title="Depreciation expense"><ix:nonFraction name="us-gaap:Depreciation" contextRef="From2020-05-012021-01-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">106,000</ix:nonFraction></span> for the nine month periods ended January 31, 2022 and 2021, respectively.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"></p>

<ix:exclude><!-- Field: Page; Sequence: 15; Value: 2 -->
    <div style="border-bottom: Black 1.5pt solid; margin-bottom: 6pt"><table cellpadding="0" cellspacing="0" style="border-collapse: collapse; width: 100%; font-size: 10pt"><tr style="vertical-align: top; text-align: left"><td style="text-align: center; width: 100%"><!-- Field: Sequence; Type: Arabic; Name: PageNo -->15<!-- Field: /Sequence --></td></tr></table></div>
    <div style="break-before: page; margin-top: 6pt"><table cellpadding="0" cellspacing="0" style="border-collapse: collapse; width: 100%; font-size: 10pt"><tr style="vertical-align: top; text-align: left"><td style="width: 100%"><a href="#toc_001">Table of Contents</a></td></tr></table></div>
    <!-- Field: /Page --></ix:exclude>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

</ix:nonNumeric><ix:nonNumeric contextRef="From2021-05-01to2022-01-31" escape="true" name="us-gaap:LesseeOperatingLeasesTextBlock"><p id="xdx_807_eus-gaap--LesseeOperatingLeasesTextBlock_zCfunVCrZRD2" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(6)
<span id="xdx_822_zdMHWb6q1UKg">Leases</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>&#160;</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Lessor
Information</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">As
of January 31, 2022, the Company has one lease which has been classified as an operating lease per accounting guidance contained within
ASC Topic 842,&#8221; <i>Leases&#8221;</i>. The Company&#8217;s remaining term on this operating lease is less than 7 months. The maturity
of lease payments remaining on this lease is immaterial.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Lessee
Information</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company has a lease for its facility located in Monroe Township, New Jersey that is used as warehouse/production space and the Company&#8217;s
principal offices and corporate headquarters. <span id="xdx_90D_eus-gaap--LesseeOperatingLeaseOptionToExtend_c20210501__20220131__srt--StatementGeographicalAxis__custom--MonroeTownshipMember_zoTrr3SiP1Z7" title="Lessee, operating lease, option to extend"><ix:nonNumeric contextRef="From2021-05-012022-01-31_custom_MonroeTownshipMember" name="us-gaap:LesseeOperatingLeaseOptionToExtend">The initial lease term is for <span id="xdx_90E_eus-gaap--LesseeOperatingLeaseTermOfContract_c20220131__srt--StatementGeographicalAxis__custom--MonroeTownshipMember" title="Lessee, operating lease, term of contract"><ix:nonNumeric contextRef="AsOf2022-01-31_custom_MonroeTownshipMember" format="ixt-sec:durwordsen" name="us-gaap:LesseeOperatingLeaseTermOfContract">seven years</ix:nonNumeric></span> which expires in November of 2024 with an option
to extend the lease for another five years.</ix:nonNumeric></span> The lease is classified as an operating lease. The operating lease is included in right-of-use
assets, lease liabilities- current and lease liabilities- long-term on the Company&#8217;s Consolidated Balance Sheets.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company also has two leases for properties located in Houston, Texas. The first was acquired as part of the 3Dent acquisition
(see Note 18) that is used as office space. The lease term is for <span id="xdx_90D_eus-gaap--LesseeOperatingLeaseTermOfContract_iI_dtY_c20220131__us-gaap--BusinessAcquisitionAxis__custom--ThreeDentAcquisitionMember_zOEJzlVy1RYh" title="Lessee, operating lease, term of contract"><ix:nonNumeric contextRef="AsOf2022-01-31_custom_ThreeDentAcquisitionMember" format="ixt-sec:duryear" name="us-gaap:LesseeOperatingLeaseTermOfContract">3</ix:nonNumeric>
</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">years and is set to <span id="xdx_906_eus-gaap--LesseeOperatingLeaseOptionToExtend_c20210501__20220131__us-gaap--BusinessAcquisitionAxis__custom--ThreeDentAcquisitionMember_zqfKMeBDwd8d" title="Lessee, operating lease, option to extend"><ix:nonNumeric contextRef="From2021-05-012022-01-31_custom_ThreeDentAcquisitionMember" name="us-gaap:LesseeOperatingLeaseOptionToExtend">expire
in January of 2023</ix:nonNumeric></span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">. The lease is classified as
an operating lease and included in the right-of-use assets, lease liabilities- current and lease liabilities- long-term on the Company&#8217;s
Consolidated Balance Sheets.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
other Houston lease is for additional office space and was renewed for a 12-month term ending on June 30, 2022.
In accordance with ASC 842-20-5-2, since the lease term at the time of renewal was 12 months, the asset was recognized directly
to the profit and loss statement on a straight-line basis and was not recognized as a right-of-use asset.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt; background-color: white">The
Company also has a lease with the University of California Berkeley in Berkeley, California that was acquired as part of the MAR
acquisition (see Note 18). The lease expires on <span id="xdx_90F_eus-gaap--LeaseExpirationDate1_c20210501__20220131__us-gaap--BusinessAcquisitionAxis__custom--ThreeDentAcquisitionMember_zT6osmei8Lh9" title="Lease expiration date"><ix:nonNumeric contextRef="From2021-05-012022-01-31_custom_ThreeDentAcquisitionMember" format="ixt:datemonthdayyearen" name="us-gaap:LeaseExpirationDate1">June
30, 2022</ix:nonNumeric></span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt; background-color: white">. </span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">In
accordance with ASC 842-20-5-2, since the remaining lease term at the time of the acquisition of MAR was less
than 12 months, the asset was recognized directly to the profit and loss statement on a straight-line basis and was not recognized
as a right-of-use asset.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt; background-color: white">Right-of-use
asset and operating lease liabilities are recognized based on the present value of futur</span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">e
minimum lease payments over the lease term at commencement date. When the implicit rate of the lease is not provided or cannot be determined,
the Company uses the incremental borrowing rate based on the information available at the effective date to determine the present value
of future payments. Lease terms may include options to extend or terminate the lease when it is reasonably certain that the Company will
exercise those options. The renewal options have not been included in the lease term as they are not reasonably certain of exercise.
Lease expense for minimum lease payments is recognized on a straight- line basis over the lease term and consists of interest on the
lease liability and the amortization of the right of use asset. Variable lease expenses, if any, are recorded as incurred.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
operating lease cash flow payments for the three months ended January 31, 2022 and 2021 were $<span id="xdx_906_eus-gaap--OperatingLeasePayments_c20211101__20220131_pp0p0" title="Operating lease payments"><ix:nonFraction name="us-gaap:OperatingLeasePayments" contextRef="From2021-11-012022-01-31" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">111,000</ix:nonFraction></span> and $<span id="xdx_900_eus-gaap--OperatingLeasePayments_c20201101__20210131_pp0p0" title="Operating lease payments"><ix:nonFraction name="us-gaap:OperatingLeasePayments" contextRef="From2020-11-012021-01-31" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">91,000</ix:nonFraction></span>, respectively. The
operating lease cash flow payments for the nine months ended January 31, 2022 and 2021 were $<span id="xdx_905_eus-gaap--OperatingLeasePayments_c20210501__20220131_pp0p0" title="Operating lease payments"><ix:nonFraction name="us-gaap:OperatingLeasePayments" contextRef="From2021-05-01to2022-01-31" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">315,000</ix:nonFraction></span> and $<span id="xdx_907_eus-gaap--OperatingLeasePayments_c20200501__20210131_pp0p0" title="Operating lease payments"><ix:nonFraction name="us-gaap:OperatingLeasePayments" contextRef="From2020-05-012021-01-31" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">259,000</ix:nonFraction></span>, respectively.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"></p>

<ix:exclude><!-- Field: Page; Sequence: 16; Value: 2 -->
    <div style="border-bottom: Black 1.5pt solid; margin-bottom: 6pt"><table cellpadding="0" cellspacing="0" style="border-collapse: collapse; width: 100%; font-size: 10pt"><tr style="vertical-align: top; text-align: left"><td style="text-align: center; width: 100%"><!-- Field: Sequence; Type: Arabic; Name: PageNo -->16<!-- Field: /Sequence --></td></tr></table></div>
    <div style="break-before: page; margin-top: 6pt"><table cellpadding="0" cellspacing="0" style="border-collapse: collapse; width: 100%; font-size: 10pt"><tr style="vertical-align: top; text-align: left"><td style="width: 100%"><a href="#toc_001">Table of Contents</a></td></tr></table></div>
    <!-- Field: /Page --></ix:exclude>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<ix:nonNumeric contextRef="From2021-05-01to2022-01-31" escape="true" name="us-gaap:LeaseCostTableTextBlock"><p id="xdx_89F_eus-gaap--LeaseCostTableTextBlock_zZrDl53ft1ud" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
components of lease expense in the Consolidated Statements of Operations for the three and nine months ended January 31, 2022 and 2021
were as follows:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;<span id="xdx_8BD_zCe6TVq7bgl2" style="display: none">Schedule of Operating Lease Costs</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
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    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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    <td colspan="2" id="xdx_49B_20210501__20220131_zrE44jNGBQPf" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">2022</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" id="xdx_495_20200501__20210131_zFY2nMX1hffj" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">2021</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
<tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="6" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Three
    months ended January 31,</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="6" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Nine
    months ended January 31,</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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    <td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">2021</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">2022</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">2021</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="6" style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(in
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  <tr id="xdx_40B_eus-gaap--OperatingLeaseCost_maLCzBwM_zmSUgfJ9eNI9" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 36%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Operating
    lease cost</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 12%; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:OperatingLeaseCost" contextRef="From2021-11-012022-01-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">92</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 12%; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:OperatingLeaseCost" contextRef="From2020-11-012021-01-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">79</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 12%; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:OperatingLeaseCost" contextRef="From2021-05-01to2022-01-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">276</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 12%; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:OperatingLeaseCost" contextRef="From2020-05-012021-01-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">238</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_40F_eus-gaap--ShortTermLeaseCost_maLCzBwM_zqBdE4uVBEV2" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Short-term
    lease cost</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:ShortTermLeaseCost" contextRef="From2021-11-012022-01-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">12</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:ShortTermLeaseCost" contextRef="From2020-11-012021-01-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">7</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:ShortTermLeaseCost" contextRef="From2021-05-01to2022-01-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">22</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:ShortTermLeaseCost" contextRef="From2020-05-012021-01-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">12</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_409_eus-gaap--LeaseCost_iT_pn3n3_mtLCzBwM_zQVUYr6oRHti" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Total
    lease cost</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:LeaseCost" contextRef="From2021-11-012022-01-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">104</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:LeaseCost" contextRef="From2020-11-012021-01-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">86</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:LeaseCost" contextRef="From2021-05-01to2022-01-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">298</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:LeaseCost" contextRef="From2020-05-012021-01-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">250</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  </table>

</ix:nonNumeric><p id="xdx_8A1_zt73tT2yM3Wl" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<ix:nonNumeric contextRef="From2021-05-01to2022-01-31" escape="true" name="OPTT:ScheduleOfRightofUseAssetsAndLeaseLiabilitiesTableTextBlock"><p id="xdx_896_ecustom--ScheduleOfRightofUseAssetsAndLeaseLiabilitiesTableTextBlock_ztFBYrfPIe9h" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Information
related to the Company&#8217;s right-of use assets and lease liabilities as of January 31, 2022 was as follows:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;<span id="xdx_8B8_zitTl4PqwDad" style="display: none">Schedule of Right-of Use Assets and Lease Liabilities</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(in
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  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; text-decoration: underline; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Operating
    lease:</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_40C_eus-gaap--OperatingLeaseRightOfUseAsset_iI_pn3n3" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 80%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Operating
    right-of-use asset, net</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; width: 16%; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:OperatingLeaseRightOfUseAsset" contextRef="AsOf2022-01-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">825</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_40F_eus-gaap--OperatingLeaseLiabilityCurrent_iI_pn3n3_maOLLzIil_zpvnlDtVLio1" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; padding-left: 10pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Right-of-use
    liability- current</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:OperatingLeaseLiabilityCurrent" contextRef="AsOf2022-01-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">323</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_403_eus-gaap--OperatingLeaseLiabilityNoncurrent_iI_pn3n3_maOLLzIil_zCnU2SCKPiCa" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; padding-left: 10pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Right-of-use
    liability- long term</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:OperatingLeaseLiabilityNoncurrent" contextRef="AsOf2022-01-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">615</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_403_eus-gaap--OperatingLeaseLiability_iTI_pn3n3_mtOLLzIil_zQW5UrsDPMul" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Total
    lease liability</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:OperatingLeaseLiability" contextRef="AsOf2022-01-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">938</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Weighted
    average remaining lease term- operating leases</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_904_eus-gaap--OperatingLeaseWeightedAverageRemainingLeaseTerm1_iI_dtY_c20220131_zc9i0zCos5oh" title="Weighted average remaining lease term- operating leases"><ix:nonNumeric contextRef="AsOf2022-01-31" format="ixt-sec:duryear" name="us-gaap:OperatingLeaseWeightedAverageRemainingLeaseTerm1">2.61</ix:nonNumeric></span>
                                            years</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Weighted
    average discount rate- operating leases</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_90B_eus-gaap--OperatingLeaseWeightedAverageDiscountRatePercent_iI_pid_dp_uPure_c20220131_zzxzmM87Mdeb" title="Weighted average discount rate- operating leases"><ix:nonFraction name="us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent" contextRef="AsOf2022-01-31" format="ixt:numdotdecimal" decimals="INF" scale="-2" unitRef="Pure">8.2</ix:nonFraction></span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">%</span></td></tr>
  </table>

</ix:nonNumeric><p id="xdx_8A2_z27mbRdoAv5j" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<ix:nonNumeric contextRef="From2021-05-01to2022-01-31" escape="true" name="us-gaap:LesseeOperatingLeaseLiabilityMaturityTableTextBlock"><p id="xdx_89F_eus-gaap--LesseeOperatingLeaseLiabilityMaturityTableTextBlock_zk1Cc1oYnOQ4" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Total
remaining lease payments under the Company&#8217;s operating leases are as follows:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;<span id="xdx_8B1_zWpYTmNFPUk9" style="display: none">Schedule of Future Minimum Lease Payments Under Operating Lease</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" id="xdx_493_20220131_zGKX5lWXUqu" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">January
    31, 2022</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(in
    thousands)</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_408_eus-gaap--LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_iI_pn3n3_maLOLLPzbOq_zplVcKBPaBRe" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 80%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Remainder
    of fiscal year 2022</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 16%; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear" contextRef="AsOf2022-01-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">99</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_40A_eus-gaap--LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_iI_pn3n3_maLOLLPzbOq_zKlMGr0PknV4" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">2023</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths" contextRef="AsOf2022-01-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">391</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_401_eus-gaap--LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_iI_pn3n3_maLOLLPzbOq_zTCvMfPcgFi3" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">2024</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo" contextRef="AsOf2022-01-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">362</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_403_eus-gaap--LesseeOperatingLeaseLiabilityPaymentsDueYearThree_iI_pn3n3_maLOLLPzbOq_ztcFDWbeWcF4" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">2025</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree" contextRef="AsOf2022-01-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">184</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_407_eus-gaap--LesseeOperatingLeaseLiabilityPaymentsDue_iTI_pn3n3_mtLOLLPzbOq_zM7Ffr6Jyiwh" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Total
    future minimum lease payments</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue" contextRef="AsOf2022-01-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">1,036</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_408_eus-gaap--LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_iNI_pn3n3_di_zxIt73wmWnR4" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Less
    imputed interest</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(<ix:nonFraction name="us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount" contextRef="AsOf2022-01-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">98</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">)</span></td></tr>
  <tr id="xdx_401_eus-gaap--OperatingLeaseLiability_iI_pn3n3" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Total</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:OperatingLeaseLiability" contextRef="AsOf2022-01-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">938</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  </table>


</ix:nonNumeric><p id="xdx_8A8_zKxnbUNqe7n5" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></p>

<ix:exclude><!-- Field: Page; Sequence: 17; Value: 2 -->
    <div style="border-bottom: Black 1.5pt solid; margin-bottom: 6pt"><table cellpadding="0" cellspacing="0" style="border-collapse: collapse; width: 100%; font-size: 10pt"><tr style="vertical-align: top; text-align: left"><td style="text-align: center; width: 100%"><!-- Field: Sequence; Type: Arabic; Name: PageNo -->17<!-- Field: /Sequence --></td></tr></table></div>
    <div style="break-before: page; margin-top: 6pt"><table cellpadding="0" cellspacing="0" style="border-collapse: collapse; width: 100%; font-size: 10pt"><tr style="vertical-align: top; text-align: left"><td style="width: 100%"><a href="#toc_001">Table of Contents</a></td></tr></table></div>
    <!-- Field: /Page --></ix:exclude>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

</ix:nonNumeric><ix:nonNumeric contextRef="From2021-05-01to2022-01-31" escape="true" name="us-gaap:AccountsPayableAndAccruedLiabilitiesDisclosureTextBlock"><p id="xdx_808_eus-gaap--AccountsPayableAndAccruedLiabilitiesDisclosureTextBlock_zTj6eYHyQ82e" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(7)
<span id="xdx_82A_zjg4175tMeLk">Accrued Expenses</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>&#160;</b></span></p>

<ix:nonNumeric contextRef="From2021-05-01to2022-01-31" escape="true" name="us-gaap:ScheduleOfAccruedLiabilitiesTableTextBlock"><p id="xdx_895_eus-gaap--ScheduleOfAccruedLiabilitiesTableTextBlock_z1TUMTLUEYTk" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Accrued
expenses consisted of the following at January 31, 2022 and April 30, 2021:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;<span id="xdx_8B1_zwqSHtG4zde8" style="display: none">Schedule of Accrued Expenses</span></span></p>

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  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
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    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:OtherEmployeeRelatedLiabilitiesCurrent" contextRef="AsOf2022-01-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">191</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:OtherEmployeeRelatedLiabilitiesCurrent" contextRef="AsOf2021-04-30" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">283</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
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    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:AccruedSalariesCurrent" contextRef="AsOf2022-01-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">409</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:AccruedSalariesCurrent" contextRef="AsOf2021-04-30" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">631</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
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    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:AccruedProfessionalFeesCurrent" contextRef="AsOf2022-01-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">96</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:AccruedProfessionalFeesCurrent" contextRef="AsOf2021-04-30" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">200</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_400_eus-gaap--OtherAccruedLiabilitiesCurrent_iI_pn3n3_maALCzOT0_z1joKwXNreFj" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Other</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:OtherAccruedLiabilitiesCurrent" contextRef="AsOf2022-01-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">166</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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    <td style="font: 10pt Times New Roman, Times, Serif"><span style="display: none; font-family: Times New Roman, Times, Serif; font-size: 10pt">Accrued
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  </table>
<!-- Field: Split-Segment; Name: 001 -->
</ix:nonNumeric><p id="xdx_8AB_zoh2YUoFwzf5" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></p>

<ix:exclude><!-- Field: Page; Sequence: 18; Value: 2 -->
    <div style="border-bottom: Black 1.5pt solid; margin-bottom: 6pt"><table cellpadding="0" cellspacing="0" style="border-collapse: collapse; width: 100%; font-size: 10pt"><tr style="vertical-align: top; text-align: left"><td style="text-align: center; width: 100%"><!-- Field: Sequence; Type: Arabic; Name: PageNo -->18<!-- Field: /Sequence --></td></tr></table></div>
    <div style="break-before: page; margin-top: 6pt"><table cellpadding="0" cellspacing="0" style="border-collapse: collapse; width: 100%; font-size: 10pt"><tr style="vertical-align: top; text-align: left"><td style="width: 100%"><a href="#toc_001">Table of Contents</a></td></tr></table></div>
    <!-- Field: /Page --></ix:exclude>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

</ix:nonNumeric><ix:nonNumeric contextRef="From2021-05-01to2022-01-31" escape="true" name="OPTT:WarrantDisclosureTextBlock"><p id="xdx_805_ecustom--WarrantDisclosureTextBlock_zAqjhc3JX067" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(8)
<span id="xdx_822_zp3b90MKJKUd">Warrants</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Liability
Classified Warrants</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">On
June 2, 2016, the Company entered into a securities purchase agreement, which was amended on June 7, 2016 (as amended, the &#8220;June
Purchase Agreement&#8221;) with certain institutional purchasers (the &#8220;June Purchasers&#8221;). Pursuant to the terms of the June
Purchase Agreement, the Company sold an aggregate of <span id="xdx_902_eus-gaap--SaleOfStockNumberOfSharesIssuedInTransaction_pid_c20160601__20160602__us-gaap--TypeOfArrangementAxis__custom--JunePurchaseAgreementMember_zdhIBEnDbcRe" title="Number of common stock shares sold"><ix:nonFraction name="us-gaap:SaleOfStockNumberOfSharesIssuedInTransaction" contextRef="From2016-06-012016-06-02_custom_JunePurchaseAgreementMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">20,850</ix:nonFraction></span> shares of Common Stock together with warrants to purchase up to an aggregate
of <span id="xdx_90D_eus-gaap--ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights_iI_pid_c20160602__us-gaap--TypeOfArrangementAxis__custom--JunePurchaseAgreementMember_zXg1olcZgxY7" title="Purchase of warrants"><ix:nonFraction name="us-gaap:ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights" contextRef="AsOf2016-06-02_custom_JunePurchaseAgreementMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">7,298</ix:nonFraction></span> shares of Common Stock. Each share of common stock was sold together with a warrant to purchase <span id="xdx_902_eus-gaap--ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight_iI_pid_c20160602__us-gaap--TypeOfArrangementAxis__custom--JunePurchaseAgreementMember_zmwqblH8CCLf" title="Purchase of common stock warrants"><ix:nonFraction name="us-gaap:ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight" contextRef="AsOf2016-06-02_custom_JunePurchaseAgreementMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">0.35</ix:nonFraction></span> of a share of common stock
at a combined purchase price of $<span id="xdx_90F_ecustom--CommonStockCombinedPurchasePricePerShare_iI_pid_c20160602__us-gaap--TypeOfArrangementAxis__custom--JunePurchaseAgreementMember_zjRgijf2CZK4" title="Common stock combined purchase price per share"><ix:nonFraction name="OPTT:CommonStockCombinedPurchasePricePerShare" contextRef="AsOf2016-06-02_custom_JunePurchaseAgreementMember" format="ixt:numdotdecimal" decimals="INF" unitRef="USDPShares">92.00</ix:nonFraction></span>. The warrants have an exercise price of $<span id="xdx_906_eus-gaap--ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_iI_pid_c20160602__us-gaap--TypeOfArrangementAxis__custom--JunePurchaseAgreementMember_zy1QeqkOWR52" title="Exercise price of warrants"><ix:nonFraction name="us-gaap:ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1" contextRef="AsOf2016-06-02_custom_JunePurchaseAgreementMember" format="ixt:numdotdecimal" decimals="INF" unitRef="USDPShares">121.60</ix:nonFraction></span> per share, became exercisable on December 3, 2016
(&#8220;Initial Exercise Date&#8221;), and expired on December 3, 2021, <span id="xdx_908_eus-gaap--WarrantsAndRightsOutstandingTerm_iI_dc_c20160602__us-gaap--TypeOfArrangementAxis__custom--JunePurchaseAgreementMember_zfh3ZLSZbe9l" title="Warrants and rights outstanding, term"><ix:nonNumeric contextRef="AsOf2016-06-02_custom_JunePurchaseAgreementMember" format="ixt-sec:durwordsen" name="us-gaap:WarrantsAndRightsOutstandingTerm">five years</ix:nonNumeric></span> following the Initial Exercise Date. As of the expiration
date, <span id="xdx_900_ecustom--NumberOfExercisedWarrants_iI_pid_dn_c20160602__us-gaap--TypeOfArrangementAxis__custom--JunePurchaseAgreementMember_zAewyaW9hg9k" title="Number of exercised warrants"><ix:nonFraction name="OPTT:NumberOfExercisedWarrants" contextRef="AsOf2016-06-02_custom_JunePurchaseAgreementMember" format="ixt-sec:numwordsen" decimals="INF" unitRef="Shares">none</ix:nonFraction></span> of the warrants had been exercised.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">On
July 22, 2016, the Company entered into a Second Amendment to the Purchase Agreement (the &#8220;Second Amended Purchase Agreement&#8221;)
with certain institutional purchasers (the &#8220;July Purchasers&#8221;). Pursuant to the terms of the Second Amended Purchase Agreement,
the Company sold an aggregate of <span id="xdx_90E_eus-gaap--SaleOfStockNumberOfSharesIssuedInTransaction_pid_c20160721__20160722__us-gaap--TypeOfArrangementAxis__custom--SecondAmendedPurchaseAgreementMember_zGHYMDcO7SY"><ix:nonFraction name="us-gaap:SaleOfStockNumberOfSharesIssuedInTransaction" contextRef="From2016-07-212016-07-22_custom_SecondAmendedPurchaseAgreementMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">29,750</ix:nonFraction>
</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">shares of Common Stock together with warrants
to purchase up to an aggregate of <span id="xdx_905_eus-gaap--ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights_iI_pid_c20160722__us-gaap--TypeOfArrangementAxis__custom--SecondAmendedPurchaseAgreementMember_zVPFyz5bHLW"><ix:nonFraction name="us-gaap:ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights" contextRef="AsOf2016-07-22_custom_SecondAmendedPurchaseAgreementMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">8,925</ix:nonFraction>
</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">shares of Common Stock. Each share of common
stock was sold together with a warrant to purchase <span id="xdx_908_eus-gaap--ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight_iI_pid_c20160722__us-gaap--TypeOfArrangementAxis__custom--SecondAmendedPurchaseAgreementMember_zcI6OyKq7aci"><ix:nonFraction name="us-gaap:ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight" contextRef="AsOf2016-07-22_custom_SecondAmendedPurchaseAgreementMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">0.30</ix:nonFraction>
</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">of a share of common stock at a combined purchase
price of $<span id="xdx_904_ecustom--CommonStockCombinedPurchasePricePerShare_iI_pid_c20160722__us-gaap--TypeOfArrangementAxis__custom--SecondAmendedPurchaseAgreementMember_zxCP97f4Mi6i"><ix:nonFraction name="OPTT:CommonStockCombinedPurchasePricePerShare" contextRef="AsOf2016-07-22_custom_SecondAmendedPurchaseAgreementMember" format="ixt:numdotdecimal" decimals="INF" unitRef="USDPShares">135.00</ix:nonFraction></span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">.
The warrants were exercisable immediately at an exercise price of $<span id="xdx_905_eus-gaap--ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_iI_pid_c20160722__us-gaap--TypeOfArrangementAxis__custom--SecondAmendedPurchaseAgreementMember_z5YlmAP0zq5h"><ix:nonFraction name="us-gaap:ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1" contextRef="AsOf2016-07-22_custom_SecondAmendedPurchaseAgreementMember" format="ixt:numdotdecimal" decimals="INF" unitRef="USDPShares">187.20</ix:nonFraction>
</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">per share. The warrants expired on <span id="xdx_90B_eus-gaap--WarrantsAndRightsOutstandingMaturityDate_iI_dd_c20160722__us-gaap--TypeOfArrangementAxis__custom--SecondAmendedPurchaseAgreementMember_z4Vz2et7jnQ"><ix:nonNumeric contextRef="AsOf2016-07-22_custom_SecondAmendedPurchaseAgreementMember" format="ixt:datemonthdayyearen" name="us-gaap:WarrantsAndRightsOutstandingMaturityDate">January
23, 2022</ix:nonNumeric></span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">, the fifth (<span id="xdx_90A_eus-gaap--WarrantsAndRightsOutstandingTerm_iI_dtY_c20160722__us-gaap--TypeOfArrangementAxis__custom--SecondAmendedPurchaseAgreementMember_zyhdpDZV8GNh"><ix:nonNumeric contextRef="AsOf2016-07-22_custom_SecondAmendedPurchaseAgreementMember" format="ixt-sec:duryear" name="us-gaap:WarrantsAndRightsOutstandingTerm">5</ix:nonNumeric></span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">th)
anniversary of the initial exercise date of January 23, 2017. As of the expiration date, <span id="xdx_902_ecustom--NumberOfExercisedWarrants_iI_pid_dn_c20160722__us-gaap--TypeOfArrangementAxis__custom--SecondAmendedPurchaseAgreementMember_zOJTElIUBnZj"><ix:nonFraction name="OPTT:NumberOfExercisedWarrants" contextRef="AsOf2016-07-22_custom_SecondAmendedPurchaseAgreementMember" format="ixt-sec:numwordsen" decimals="INF" unitRef="Shares">none
</ix:nonFraction></span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">of the warrants had been exercised.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Equity
Classified Warrants</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">On
April 8, 2019, the Company issued and sold <span id="xdx_903_eus-gaap--SaleOfStockNumberOfSharesIssuedInTransaction_pid_c20190407__20190408_zh7i4PrcXq6b" title="Number of common stock shares sold"><ix:nonFraction name="us-gaap:SaleOfStockNumberOfSharesIssuedInTransaction" contextRef="From2019-04-072019-04-08" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">1,542,000</ix:nonFraction></span> shares of common stock and pre-funded warrants to purchase up to <span id="xdx_90F_eus-gaap--ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights_iI_pid_c20190408__us-gaap--StatementEquityComponentsAxis__custom--PreFundedWarrantsMember_znGb5S4Taub8" title="Purchase of warrants"><ix:nonFraction name="us-gaap:ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights" contextRef="AsOf2019-04-08_custom_PreFundedWarrantsMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">3,385,680</ix:nonFraction></span> shares
of common stock and common warrants to purchase up to <span id="xdx_901_eus-gaap--ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights_iI_pid_c20190408__us-gaap--StatementEquityComponentsAxis__custom--CommonWarrantsMember_zjLUTX0mFJ89" title="Purchase of warrants"><ix:nonFraction name="us-gaap:ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights" contextRef="AsOf2019-04-08_custom_CommonWarrantsMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">4,927,680</ix:nonFraction></span> shares of our common stock in an underwritten public offering. The public
offering price for the pre-funded warrants was equal to the public offering price of the common stock, less the $<span id="xdx_908_eus-gaap--ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_iI_pid_c20190408__us-gaap--StatementEquityComponentsAxis__custom--PreFundedWarrantsMember_zf5NZT0Xb6uh" title="Exercise price of warrants"><ix:nonFraction name="us-gaap:ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1" contextRef="AsOf2019-04-08_custom_PreFundedWarrantsMember" format="ixt:numdotdecimal" decimals="INF" unitRef="USDPShares">0.01</ix:nonFraction></span> per share exercise
price of each warrant. The pre-funded warrants have no expiration date. As of January 31, 2022, all of the pre-funded warrants had been
exercised. The common stock warrants have an exercise price of $<span id="xdx_905_eus-gaap--ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_iI_pid_c20190408__us-gaap--StatementEquityComponentsAxis__custom--CommonWarrantsMember_zY3lQEdmPMd" title="Exercise price of warrants"><ix:nonFraction name="us-gaap:ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1" contextRef="AsOf2019-04-08_custom_CommonWarrantsMember" format="ixt:numdotdecimal" decimals="INF" unitRef="USDPShares">3.85</ix:nonFraction></span> per share and expire <span id="xdx_903_eus-gaap--WarrantsAndRightsOutstandingTerm_iI_dc_c20190408__us-gaap--StatementEquityComponentsAxis__custom--CommonWarrantsMember_zVPqRLMLYEfk" title="Warrants and rights outstanding, term"><ix:nonNumeric contextRef="AsOf2019-04-08_custom_CommonWarrantsMember" format="ixt-sec:durwordsen" name="us-gaap:WarrantsAndRightsOutstandingTerm">five years</ix:nonNumeric></span> from the issuance date. As of January
31, 2022, all of the common warrants had been exercised.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company accounts for warrants issued in connection with its June 2016 and July 2016 public offerings in accordance with the guidance
on &#8220;<i>Accounting for Certain Financial Instruments with Characteristics of Both Liabilities and Equity</i>&#8221; in Topic 480
which provides that the Company classify the warrant instruments as a liability at its fair value. The warrant liabilities are subject
to re-measurement at each balance sheet date using the Black-Scholes option pricing model. The June 2016 and July 2016 warrants contained
a feature whereby they could require the transfer of assets and therefore are classified as a liability award in accordance with the
guidance in Topic 480. The warrants were all expired as of January 31, 2022 and had a value near zero as of </span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">April 30, 2021. The pre-funded and
common warrants issued in the Company&#8217;s April 8, 2019 public offering did not meet the criteria to be classified as a liability
award and therefore were treated as an equity award and recorded as a component of shareholders&#8217; equity in the Consolidated Balance
Sheets.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"></p>

<ix:exclude><!-- Field: Page; Sequence: 19; Value: 2 -->
    <div style="border-bottom: Black 1.5pt solid; margin-bottom: 6pt"><table cellpadding="0" cellspacing="0" style="border-collapse: collapse; width: 100%; font-size: 10pt"><tr style="vertical-align: top; text-align: left"><td style="text-align: center; width: 100%"><!-- Field: Sequence; Type: Arabic; Name: PageNo -->19<!-- Field: /Sequence --></td></tr></table></div>
    <div style="break-before: page; margin-top: 6pt"><table cellpadding="0" cellspacing="0" style="border-collapse: collapse; width: 100%; font-size: 10pt"><tr style="vertical-align: top; text-align: left"><td style="width: 100%"><a href="#toc_001">Table of Contents</a></td></tr></table></div>
    <!-- Field: /Page --></ix:exclude>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

</ix:nonNumeric><ix:nonNumeric contextRef="From2021-05-01to2022-01-31" escape="true" name="us-gaap:DebtDisclosureTextBlock"><p id="xdx_801_eus-gaap--DebtDisclosureTextBlock_zogtgjNXwXBa" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(9)
<span id="xdx_82E_zZh36Vz1giuh">Paycheck Protection Program Loan</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>&#160;</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">On
March 27, 2020, the U.S. Government passed into law the Coronavirus Aid, Relief and Economic Security Act, or the (&#8220;CARES Act&#8221;).
On May 3, 2020, the Company signed a Paycheck Protection Program (&#8220;PPP&#8221;) loan with Santander as the lender for approximately
$<span id="xdx_907_eus-gaap--ProceedsFromLoanOriginations1_c20200501__20200503__us-gaap--TypeOfArrangementAxis__custom--PaycheckProtectionProgramMember_pp0p0" title="Proceeds from loan originations"><ix:nonFraction name="us-gaap:ProceedsFromLoanOriginations1" contextRef="From2020-05-012020-05-03_custom_PaycheckProtectionProgramMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">890,000</ix:nonFraction></span> in support through the Small Business Association (&#8220;SBA&#8221;) under the PPP Loan. The PPP Loan was unsecured and evidenced
by a note in favor of Santander as the lender and governed by a Loan Agreement with Santander. The Company received the proceeds on May
5, 2020.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_906_ecustom--DebtForgivenessDescription_c20200501__20200503__us-gaap--TypeOfArrangementAxis__custom--PaycheckProtectionProgramMember_zBmMYTCywIXf" title="Debt forgiveness, description"><ix:nonNumeric contextRef="From2020-05-012020-05-03_custom_PaycheckProtectionProgramMember" name="OPTT:DebtForgivenessDescription">The
Company filed its loan forgiveness application at the end of February 2021 asking for <span id="xdx_90C_eus-gaap--DebtInstrumentInterestRateStatedPercentage_iI_pid_dp_c20200503__us-gaap--TypeOfArrangementAxis__custom--PaycheckProtectionProgramMember_zPsNYjhcoO9j" title="Debt interest rate"><ix:nonFraction name="us-gaap:DebtInstrumentInterestRateStatedPercentage" contextRef="AsOf2020-05-03_custom_PaycheckProtectionProgramMember" format="ixt:numdotdecimal" decimals="INF" scale="-2" unitRef="Pure">100</ix:nonFraction></span>% forgiveness of the loan. In June 2021, the
Company was informed that its application was approved, and that the loan is now fully forgiven. The Company recognized a gain on extinguishment
of PPP loan of approximately $<span id="xdx_905_eus-gaap--RepaymentsOfLongTermDebt_pp0p0_c20210202__20211031__us-gaap--TypeOfArrangementAxis__custom--PaycheckProtectionProgramMember_ztMXdZv6vRHj" title="Repayments of long-term debt"><ix:nonFraction name="us-gaap:RepaymentsOfLongTermDebt" contextRef="From2021-02-022021-10-31_custom_PaycheckProtectionProgramMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">890,000</ix:nonFraction></span> during the nine months ended October 31, 2021 as reflected on the Consolidated Statement of Operations.</ix:nonNumeric></span></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

</ix:nonNumeric><ix:nonNumeric contextRef="From2021-05-01to2022-01-31" escape="true" name="us-gaap:PreferredStockTextBlock"><p id="xdx_80E_eus-gaap--PreferredStockTextBlock_zQ2qEZB56wd4" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(10)
<span id="xdx_822_z6ctCEBR8aT5">Preferred Stock</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>&#160;</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company has authorized <span id="xdx_90A_eus-gaap--PreferredStockSharesAuthorized_iI_pid_c20220131_z22aIg5O2fS2" title="Preferred stock, shares authorized"><ix:nonFraction name="us-gaap:PreferredStockSharesAuthorized" contextRef="AsOf2022-01-31" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">5,000,000</ix:nonFraction></span> shares of undesignated preferred stock with a par value of $<span id="xdx_90A_eus-gaap--PreferredStockParOrStatedValuePerShare_iI_pid_c20220131_z6wkombe8Nw2" title="Preferred stock, par value"><ix:nonFraction name="us-gaap:PreferredStockParOrStatedValuePerShare" contextRef="AsOf2022-01-31" format="ixt:numdotdecimal" decimals="INF" unitRef="USDPShares">0.001</ix:nonFraction></span> per share. As of January 31, 2022,
<span id="xdx_90F_eus-gaap--PreferredStockSharesIssued_iI_pid_do_c20220131_zZ2QEyzrQjQd" title="Preferred stock, shares issued"><ix:nonFraction name="us-gaap:PreferredStockSharesIssued" contextRef="AsOf2022-01-31" format="ixt-sec:numwordsen" decimals="INF" unitRef="Shares">no</ix:nonFraction></span> shares of preferred stock had been issued.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

</ix:nonNumeric><ix:nonNumeric contextRef="From2021-05-01to2022-01-31" escape="true" name="us-gaap:StockholdersEquityNoteDisclosureTextBlock"><p id="xdx_80F_eus-gaap--StockholdersEquityNoteDisclosureTextBlock_zVNhMxmWvUue" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(11)
<span id="xdx_82C_zAV1WBwr0pLa">Common Stock</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>&#160;</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company has authorized <span id="xdx_90A_eus-gaap--CommonStockSharesAuthorized_iI_pid_c20220131_zXnWJxsQtzq9" title="Common stock, shares authorized"><ix:nonFraction name="us-gaap:CommonStockSharesAuthorized" contextRef="AsOf2022-01-31" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">100,000,000</ix:nonFraction></span> shares of common stock with a par value of $<span id="xdx_90B_eus-gaap--CommonStockParOrStatedValuePerShare_iI_pid_c20220131_zYD7eYP5B9T9" title="Common stock, par value"><ix:nonFraction name="us-gaap:CommonStockParOrStatedValuePerShare" contextRef="AsOf2022-01-31" format="ixt:numdotdecimal" decimals="INF" unitRef="USDPShares">0.001</ix:nonFraction></span> per share. As of January 31, 2022, <span id="xdx_905_eus-gaap--CommonStockSharesIssued_iI_pid_c20220131_z2YNQhCCcp1" title="Common stock, shares issued"><span id="xdx_902_eus-gaap--CommonStockSharesOutstanding_iI_pid_c20220131_z1LAV7F7DLFi" title="Common stock, shares outstanding"><ix:nonFraction name="us-gaap:CommonStockSharesIssued" contextRef="AsOf2022-01-31" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares"><ix:nonFraction name="us-gaap:CommonStockSharesOutstanding" contextRef="AsOf2022-01-31" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">55,894,213</ix:nonFraction></ix:nonFraction></span></span> shares
had been issued and are outstanding.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

</ix:nonNumeric><ix:nonNumeric contextRef="From2021-05-01to2022-01-31" escape="true" name="us-gaap:TreasuryStockTextBlock"><p id="xdx_800_eus-gaap--TreasuryStockTextBlock_zy4ucjx0hgBh" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(12)
<span id="xdx_82B_zQQs684KTUc4">Treasury Shares</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">During
each of the nine months ended January 31, 2022 and 2021, <span id="xdx_90F_eus-gaap--TreasuryStockSharesAcquired_pid_do_c20210501__20220131_zNwLX97hwmc4" title="Treasury stock, shares, acquired"><span id="xdx_906_eus-gaap--TreasuryStockSharesAcquired_pid_do_c20200501__20210131_zOu2wKXnw452" title="Treasury stock, shares, acquired"><ix:nonFraction name="us-gaap:TreasuryStockSharesAcquired" contextRef="From2021-05-01to2022-01-31" format="ixt-sec:numwordsen" decimals="INF" unitRef="Shares"><ix:nonFraction name="us-gaap:TreasuryStockSharesAcquired" contextRef="From2020-05-012021-01-31" format="ixt-sec:numwordsen" decimals="INF" unitRef="Shares">no</ix:nonFraction></ix:nonFraction></span></span> shares of common stock were purchased by the Company from employees to pay
taxes related to the vesting of restricted stock.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

</ix:nonNumeric><ix:nonNumeric contextRef="From2021-05-01to2022-01-31" escape="true" name="us-gaap:DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock"><p id="xdx_805_eus-gaap--DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_zXRqsvPgPG7k" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(13)
<span id="xdx_828_zJK2Avg8SfW2">Share-Based Compensation</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>&#160;</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">In
2015, upon approval by the Company&#8217;s shareholders, the Company&#8217;s 2015 Omnibus Incentive Plan (the &#8220;2015 Plan&#8221;)
became effective. A total of <span id="xdx_90C_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_c20151231__us-gaap--PlanNameAxis__custom--TwoThousandAndFifteenOmnibusIncentivePlanMember_pdd" title="Share-based compensation arrangement shares authorized"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized" contextRef="AsOf2015-12-31_custom_TwoThousandAndFifteenOmnibusIncentivePlanMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">1,332,036</ix:nonFraction></span> shares were authorized for issuance under the 2015 Omnibus Incentive Plan, including shares available
for awards under the 2006 Stock Incentive Plan remaining at the time that plan terminated, or that were subject to awards under the 2006
Stock Incentive Plan that thereafter terminated by reason of expiration, forfeiture, cancellation or otherwise. If any award under the
2006 Stock Incentive Plan or 2015 Plan expires, is cancelled, terminates unexercised or is forfeited, those shares become again available
for grant under the 2015 Plan. The 2015 Plan will terminate ten years after its effective date, in October 2025, but is subject to earlier
termination as provided in the 2015 Plan. As of January 31, 2022, the Company has <span id="xdx_908_eus-gaap--CommonStockCapitalSharesReservedForFutureIssuance_c20220131__us-gaap--PlanNameAxis__custom--TwoThousandAndFifteenOmnibusIncentivePlanMember_pdd" title="Capital shares reserved for future issuance"><ix:nonFraction name="us-gaap:CommonStockCapitalSharesReservedForFutureIssuance" contextRef="AsOf2022-01-31_custom_TwoThousandAndFifteenOmnibusIncentivePlanMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">696,627</ix:nonFraction></span> shares available for future issuance under
the 2015 Plan which reflects adjustments made for the departure of our former CEO as well as other departures.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">On
January 18, 2018, the Company&#8217;s Board of Directors adopted the Company&#8217;s Employment Inducement Incentive Award Plan (the
&#8220;2018 Inducement Plan&#8221;) pursuant to which the Company reserved <span id="xdx_902_eus-gaap--CommonStockCapitalSharesReservedForFutureIssuance_c20180118__us-gaap--PlanNameAxis__custom--TwoThousandAndEighteenInducementPlanMember_pdd" title="Capital shares reserved for future issuance"><ix:nonFraction name="us-gaap:CommonStockCapitalSharesReservedForFutureIssuance" contextRef="AsOf2018-01-18_custom_TwoThousandAndEighteenInducementPlanMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">25,000</ix:nonFraction></span> shares of common stock for issuance under the Inducement
Plan. In accordance with Rule 711(a) of the NYSE American Company Guide, awards under the Inducement Plan may only be made to individuals
not previously employed by the Company (or following such individuals&#8217; bona fide period of non-employment with the Company), as
an inducement material to the individuals&#8217; entry into employment with the Company. An award is any right to receive the Company&#8217;s
common stock pursuant to the 2018 Inducement Plan, consisting of a performance share award, restricted stock award, a restricted stock
unit award or a stock payment award. As of January 31, 2022, there were <span id="xdx_90F_eus-gaap--CommonStockCapitalSharesReservedForFutureIssuance_c20220131__us-gaap--PlanNameAxis__custom--TwoThousandAndEighteenInducementPlanMember_pdd" title="Capital shares reserved for future issuance"><ix:nonFraction name="us-gaap:CommonStockCapitalSharesReservedForFutureIssuance" contextRef="AsOf2022-01-31_custom_TwoThousandAndEighteenInducementPlanMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">11,487</ix:nonFraction></span> shares available for grant under the 2018 Inducement Plan.
On February 9, 2022 the 2018 Inducement Plan was amended to increase the authorized shares by <span id="xdx_901_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_iI_pid_c20220208__us-gaap--PlanNameAxis__custom--TwoThousandAndEighteenInducementPlanMember_zTufnVQDbdfb" title="Share-based compensation arrangement shares authorized"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized" contextRef="AsOf2022-02-08_custom_TwoThousandAndEighteenInducementPlanMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">250,000</ix:nonFraction></span> to <span id="xdx_904_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_iI_pid_c20220209__us-gaap--PlanNameAxis__custom--TwoThousandAndEighteenInducementPlanMember_zaFhKeiXz2Sf" title="Share-based compensation arrangement shares authorized"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized" contextRef="AsOf2022-02-09_custom_TwoThousandAndEighteenInducementPlanMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">275,000</ix:nonFraction></span>.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"></p>

<ix:exclude><!-- Field: Page; Sequence: 20; Value: 2 -->
    <div style="border-bottom: Black 1.5pt solid; margin-bottom: 6pt"><table cellpadding="0" cellspacing="0" style="border-collapse: collapse; width: 100%; font-size: 10pt"><tr style="vertical-align: top; text-align: left"><td style="text-align: center; width: 100%"><!-- Field: Sequence; Type: Arabic; Name: PageNo -->20<!-- Field: /Sequence --></td></tr></table></div>
    <div style="break-before: page; margin-top: 6pt"><table cellpadding="0" cellspacing="0" style="border-collapse: collapse; width: 100%; font-size: 10pt"><tr style="vertical-align: top; text-align: left"><td style="width: 100%"><a href="#toc_001">Table of Contents</a></td></tr></table></div>
    <!-- Field: /Page --></ix:exclude>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Stock
Options</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company estimates the fair value of each stock option award granted with service-based vesting requirements, using the Black-Scholes
option pricing model, assuming no dividends, and using the weighted average valuation assumptions noted in the following table. The risk-free
rate is based on the US Treasury yield curve in effect at the time of grant. The expected life (estimated period of time outstanding)
of the stock options granted is estimated using the &#8220;simplified&#8221; method as permitted by the SEC&#8217;s Staff Accounting
Bulletin No. 110, <i>Share-Based Payment.</i> Expected volatility is based on the Company&#8217;s historical volatility over the expected
life of the stock option granted. The Company granted options to acquire <span id="xdx_909_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_pid_c20211101__20220131__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zAZgXjAhasJ1"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross" contextRef="From2021-11-012022-01-31_us-gaap_EmployeeStockOptionMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">793,850</ix:nonFraction>
</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">and <span id="xdx_901_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_pid_c20200501__20210131__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zqqZtjTtbJk9"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross" contextRef="From2020-05-012021-01-31_us-gaap_EmployeeStockOptionMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">248,876</ix:nonFraction>
</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">shares of stock options during
the three and nine months ended January 31, 2022 and 2021, respectively. The following assumptions were used to value the awards:</span></p>

<ix:nonNumeric contextRef="From2021-05-01to2022-01-31" escape="true" name="us-gaap:ScheduleOfAssumptionsUsedTableTextBlock"><p id="xdx_890_eus-gaap--ScheduleOfAssumptionsUsedTableTextBlock_z8EiUHTn0w23" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;<span id="xdx_8B3_zWaD8s0syXn3" style="display: none">Schedule
of Valuation Assumptions</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="6" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Nine
    months ended January 31,</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">2022</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 64%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Risk-free
    interest rate</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_90B_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_pid_dp_uPure_c20210501__20220131__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zqQydPnN40E3" title="Risk-free interest rate"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate" contextRef="From2021-05-012022-01-31_us-gaap_EmployeeStockOptionMember" format="ixt:numdotdecimal" decimals="INF" scale="-2" unitRef="Pure">1.5</ix:nonFraction></span></span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">%</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_904_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_pid_dp_uPure_c20200501__20210131__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zrCiQQnB8bR3" title="Risk-free interest rate"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate" contextRef="From2020-05-012021-01-31_us-gaap_EmployeeStockOptionMember" format="ixt:numdotdecimal" decimals="INF" scale="-2" unitRef="Pure">6.0</ix:nonFraction></span></span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">%</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Expected
    dividend yield</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td id="xdx_983_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_pid_dp_uPure_c20210501__20220131__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zWTySAUWOzV7" title="Expected dividend yield" style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span style="-sec-ix-hidden: xdx2ixbrl1367">&#8212;</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">%</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td id="xdx_980_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_pid_dp_uPure_c20200501__20210131__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zel3u5Dy7gy7" title="Expected dividend yield" style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span style="-sec-ix-hidden: xdx2ixbrl1369">&#8212;</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">%</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Expected
    life (in years)</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span id="xdx_90E_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_dtY_c20210501__20220131__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zdJIGWaFClLg" title="Expected life (in years)" style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonNumeric contextRef="From2021-05-012022-01-31_us-gaap_EmployeeStockOptionMember" format="ixt-sec:duryear" name="us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1">5.6</ix:nonNumeric></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span id="xdx_90F_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_dtY_c20200501__20210131__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_z0xdwpHQxkv" title="Expected life (in years)" style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonNumeric contextRef="From2020-05-012021-01-31_us-gaap_EmployeeStockOptionMember" format="ixt-sec:duryear" name="us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1">5.9</ix:nonNumeric></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Expected
    volatility</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_90E_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_pid_dp_uPure_c20210501__20220131__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_z6HtrJ1CpUp2" title="Expected volatility"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate" contextRef="From2021-05-012022-01-31_us-gaap_EmployeeStockOptionMember" format="ixt:numdotdecimal" decimals="INF" scale="-2" unitRef="Pure">121.9</ix:nonFraction></span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">%</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_906_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_pid_dp_uPure_c20200501__20210131__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zL99UmdIUMP1" title="Expected volatility"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate" contextRef="From2020-05-012021-01-31_us-gaap_EmployeeStockOptionMember" format="ixt:numdotdecimal" decimals="INF" scale="-2" unitRef="Pure">136.5</ix:nonFraction></span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">%</span></td></tr>
  </table>

</ix:nonNumeric><p id="xdx_8AE_zpvZwbbiFL1f" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<ix:nonNumeric contextRef="From2021-05-01to2022-01-31" escape="true" name="us-gaap:ScheduleOfShareBasedCompensationActivityTableTextBlock"><p id="xdx_899_eus-gaap--ScheduleOfShareBasedCompensationActivityTableTextBlock_zNdOtyMulPaf" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">A
summary of stock options under our stock incentive plans is detailed in the following table.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;<span id="xdx_8B3_zIs0aCObVAve" style="display: none">Schedule of Stock Option Activity</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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                                            </b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Underlying
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    <td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_905_ecustom--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm_dtY_c20210501__20220131__us-gaap--AwardTypeAxis__custom--StockIncentivePlanMember_z386QtOBAAAk" title="Weighted Average Remaining Contractual Term (In Years), Ending"><ix:nonNumeric contextRef="From2021-05-012022-01-31_custom_StockIncentivePlanMember" format="ixt-sec:duryear" name="OPTT:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm">9.4</ix:nonNumeric></span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Exercisable
    as of January 31, 2022</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td id="xdx_988_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_iI_pid_c20220131__us-gaap--AwardTypeAxis__custom--StockIncentivePlanMember_z9Ya0TtZtO6i" title="Shares Underlying Options Outstanding, Exercisable at Ending" style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber" contextRef="AsOf2022-01-31_custom_StockIncentivePlanMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">308,481</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td id="xdx_989_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_iI_pid_c20220131__us-gaap--AwardTypeAxis__custom--StockIncentivePlanMember_zade9x7Yfja" title="Weighted Average Exercise Price, Exercisable at Ending" style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice" contextRef="AsOf2022-01-31_custom_StockIncentivePlanMember" format="ixt:numdotdecimal" decimals="INF" unitRef="USDPShares">4.59</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_907_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_dtY_c20210501__20220131__us-gaap--AwardTypeAxis__custom--StockIncentivePlanMember_zCvtrEkhkB66" title="Weighted Average Remaining Contractual Term (In Years), Exercisable at Ending"><ix:nonNumeric contextRef="From2021-05-012022-01-31_custom_StockIncentivePlanMember" format="ixt-sec:duryear" name="us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1">8.1</ix:nonNumeric></span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  </table>

</ix:nonNumeric><p id="xdx_8A0_zdAmDOFbz0ph" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">As
of January 31, 2022, the total intrinsic value of outstanding and exercisable options was approximately $<span id="xdx_900_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_iI_pp0p0_c20220131__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_z4rzomtctzBd" title="Intrinsic value of outstanding and exercisable options"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue" contextRef="AsOf2022-01-31_us-gaap_EmployeeStockOptionMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">11,560</ix:nonFraction></span>. As of January 31, 2022,
approximately <span id="xdx_907_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares_iI_pid_c20220131__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_z1VT3kRgCgZg" title="Options unvested"><ix:nonFraction name="us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares" contextRef="AsOf2022-01-31_us-gaap_EmployeeStockOptionMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">835,000</ix:nonFraction></span> additional options were unvested, which had an intrinsic value of <span id="xdx_904_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_iI_pp0p0_do_c20220131__us-gaap--AwardTypeAxis__custom--EmployeeStockOptionOneMember_zPDtyXZ4Benl" title="Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value">zero</span> and a weighted average remaining contractual
term of <span id="xdx_909_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1_dtY_c20210501__20220131__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zxPHN8j3Ykqb" title="Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term"><ix:nonNumeric contextRef="From2021-05-012022-01-31_us-gaap_EmployeeStockOptionMember" format="ixt-sec:duryear" name="us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1">9.9</ix:nonNumeric></span> years. There was approximately $<span id="xdx_900_eus-gaap--AllocatedShareBasedCompensationExpense_pp0p0_c20210501__20220131__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zcr1ZBL2qg98" title="Share-based payment arrangement, expense"><ix:nonFraction name="us-gaap:AllocatedShareBasedCompensationExpense" contextRef="From2021-05-012022-01-31_us-gaap_EmployeeStockOptionMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">183,000</ix:nonFraction></span> and $<span id="xdx_903_eus-gaap--AllocatedShareBasedCompensationExpense_pp0p0_c20200501__20210131__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_ztO1SMZ7NYZ3" title="Share-based payment arrangement, expense"><ix:nonFraction name="us-gaap:AllocatedShareBasedCompensationExpense" contextRef="From2020-05-012021-01-31_us-gaap_EmployeeStockOptionMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">296,000</ix:nonFraction></span> of total recognized compensation cost related to stock options during
each of the nine months ended January 31, 2022 and 2021, respectively. As of January 31, 2022, there was approximately $<span id="xdx_900_eus-gaap--EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions_iI_pp0p0_c20220131__us-gaap--AwardTypeAxis__custom--NonVestedStockMember_zEXvKiBjJk5" title="Unrecognized compensation cost related to non-vested stock"><ix:nonFraction name="us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions" contextRef="AsOf2022-01-31_custom_NonVestedStockMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">102,000</ix:nonFraction></span> of total
unrecognized compensation cost related to non-vested stock options granted under the plans. This cost is expected to be recognized over
a weighted-average period of <span id="xdx_900_eus-gaap--EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_dtY_c20210501__20220131__us-gaap--AwardTypeAxis__custom--NonVestedStockMember_zMQJfGt4PHm3" title="Share-based compensation of weighted-average period"><ix:nonNumeric contextRef="From2021-05-012022-01-31_custom_NonVestedStockMember" format="ixt-sec:duryear" name="us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1">1.0</ix:nonNumeric></span> year.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company&#8217;s acquisition of 3Dent (See Note 18) was valued at the fair value of the stock on the acquisition date of $<span id="xdx_90D_ecustom--FairValueOfBasePurchasePrice_iI_pp0p0_c20210201__us-gaap--BusinessAcquisitionAxis__custom--ThreeDentAcquisitionMember_zAcoJdLPEEF2"><ix:nonFraction name="OPTT:FairValueOfBasePurchasePrice" contextRef="AsOf2021-02-01_custom_ThreeDentAcquisitionMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">1,451,584</ix:nonFraction>
</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(<span id="xdx_902_eus-gaap--StockIssuedDuringPeriodSharesNewIssues_pid_c20210130__20210201__us-gaap--BusinessAcquisitionAxis__custom--ThreeDentAcquisitionMember_zQBRKKv72pUg"><ix:nonFraction name="us-gaap:StockIssuedDuringPeriodSharesNewIssues" contextRef="From2021-01-302021-02-01_custom_ThreeDentAcquisitionMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">361,991</ix:nonFraction>
</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">shares at $<span id="xdx_907_eus-gaap--BusinessAcquisitionSharePrice_iI_pid_c20210201__us-gaap--BusinessAcquisitionAxis__custom--ThreeDentAcquisitionMember_zGyxaEbaEwfj"><ix:nonFraction name="us-gaap:BusinessAcquisitionSharePrice" contextRef="AsOf2021-02-01_custom_ThreeDentAcquisitionMember" format="ixt:numdotdecimal" decimals="INF" unitRef="USDPShares">4.01</ix:nonFraction></span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">).
Since the share restrictions were set to expire on February 1, 2022, within one year of the closing of the acquisition,
and lacked marketability, the Company applied a 20% discount to the purchase price making the adjusted fair value $<span id="xdx_90F_ecustom--AdjustedFairValue_iI_pp0p0_c20210201__us-gaap--BusinessAcquisitionAxis__custom--ThreeDentAcquisitionMember_z6IWXjXgR8Za" title="Fair Value of Purchase"><ix:nonFraction name="OPTT:AdjustedFairValue" contextRef="AsOf2021-02-01_custom_ThreeDentAcquisitionMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">1,161,267</ix:nonFraction></span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">.
Additionally, as the sellers must be employed for 12 months from the date of acquisition to retain all of their shares, the difference
between the calculated fair value and the net assets acquired represents the value of the compensation expense to be recognized over
the period of the agreed upon employment.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"></p>

<ix:exclude><!-- Field: Page; Sequence: 21; Value: 2 -->
    <div style="border-bottom: Black 1.5pt solid; margin-bottom: 6pt"><table cellpadding="0" cellspacing="0" style="border-collapse: collapse; width: 100%; font-size: 10pt"><tr style="vertical-align: top; text-align: left"><td style="text-align: center; width: 100%"><!-- Field: Sequence; Type: Arabic; Name: PageNo -->21<!-- Field: /Sequence --></td></tr></table></div>
    <div style="break-before: page; margin-top: 6pt"><table cellpadding="0" cellspacing="0" style="border-collapse: collapse; width: 100%; font-size: 10pt"><tr style="vertical-align: top; text-align: left"><td style="width: 100%"><a href="#toc_001">Table of Contents</a></td></tr></table></div>
    <!-- Field: /Page --></ix:exclude>

<ix:nonNumeric contextRef="From2021-05-01to2022-01-31" escape="true" name="OPTT:ScheduleOfBusinessAcquisitionAndFairValueOfNetAssetsCompensationExpenseRecognized"><p id="xdx_89E_ecustom--ScheduleOfBusinessAcquisitionAndFairValueOfNetAssetsCompensationExpenseRecognized_zu1LsraQHi47" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;<span id="xdx_8B7_zVIRlnvi8VIa" style="display: none">Schedule of Business Acquisition and Fair Value of Net Assets, Compensation Expense Recognized</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 80%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Fair
    Value of Purchase</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td id="xdx_985_ecustom--AdjustedFairValue_iI_pp0p0_c20210201__us-gaap--BusinessAcquisitionAxis__custom--ThreeDentAcquisitionMember_z1HaqeEVrnDl" title="Fair Value of Purchase" style="font: 10pt Times New Roman, Times, Serif; width: 16%; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="OPTT:AdjustedFairValue" contextRef="AsOf2021-02-01_custom_ThreeDentAcquisitionMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">1,161,267</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Total
    Acquired Assets</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td id="xdx_988_eus-gaap--BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_iNI_pp0p0_di_c20210201__us-gaap--BusinessAcquisitionAxis__custom--ThreeDentAcquisitionMember_zwtrNIbtnlr" title="Total Acquired Assets" style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(<ix:nonFraction name="us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets" contextRef="AsOf2021-02-01_custom_ThreeDentAcquisitionMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">593,571</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">)</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Total
    Acquired Liabilities</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td id="xdx_980_eus-gaap--BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_c20210201__us-gaap--BusinessAcquisitionAxis__custom--ThreeDentAcquisitionMember_pp0p0" title="Total Acquired Liabilities" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities" contextRef="AsOf2021-02-01_custom_ThreeDentAcquisitionMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">117,106</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Compensation
    Expense</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td id="xdx_987_ecustom--BusinessComibinationCompensationExpensesRecognized_c20210201__us-gaap--BusinessAcquisitionAxis__custom--ThreeDentAcquisitionMember_pp0p0" title="Compensation Expense" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="OPTT:BusinessComibinationCompensationExpensesRecognized" contextRef="AsOf2021-02-01_custom_ThreeDentAcquisitionMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">684,802</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Quarterly
    Compensation Expense</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td id="xdx_98F_ecustom--BusinessComibinationQuarterlyCompensationExpensesRecognized_c20210201__us-gaap--BusinessAcquisitionAxis__custom--ThreeDentAcquisitionMember_pp0p0" title="Quarterly Compensation Expense" style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="OPTT:BusinessComibinationQuarterlyCompensationExpensesRecognized" contextRef="AsOf2021-02-01_custom_ThreeDentAcquisitionMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">171,201</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  </table>

</ix:nonNumeric><p id="xdx_8AD_zQNuBmqABTW6" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company has recognized approximately $<span id="xdx_90D_ecustom--BusinessComibinationQuarterlyCompensationExpensesConsiderationPaid_iI_pp0p0_c20210201__us-gaap--BusinessAcquisitionAxis__custom--ThreeDentAcquisitionMember_zjRKvmVxsrB8"><ix:nonFraction name="OPTT:BusinessComibinationQuarterlyCompensationExpensesConsiderationPaid" contextRef="AsOf2021-02-01_custom_ThreeDentAcquisitionMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">171,000</ix:nonFraction>
</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">of compensation expense on a quarterly basis
for the consideration paid for 12 months from the acquisition date of February 2, 2021. The last of this compensation expense was
recognized during the quarter ended January 31, 2022.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Performance
Stock Options</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">In
January 2020, the Company issued <span id="xdx_907_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_pid_c20200101__20200131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember__srt--TitleOfIndividualAxis__custom--TwoExecutivesMember_zXsNMBhtuj13" title="Share-based compensation options, grants in period, gross"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross" contextRef="From2020-01-012020-01-31_custom_PerformanceStockOptionsMember_custom_TwoExecutivesMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">81,337</ix:nonFraction></span> performance-based stock options to two of its executives. There were <span id="xdx_903_ecustom--ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesVestedAndOutstanding_pid_c20200101__20200131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zo36TUwD8eAb" title="Shares vested and outstanding"><ix:nonFraction name="OPTT:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesVestedAndOutstanding" contextRef="From2020-01-012020-01-31_custom_PerformanceStockOptionsMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">40,668</ix:nonFraction></span> shares that were
vested and outstanding, which were set to expire on <span id="xdx_902_eus-gaap--DebtInstrumentMaturityDate_dd_c20200101__20200131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zWrbzjEny6qb" title="Debt expire date"><ix:nonNumeric contextRef="From2020-01-012020-01-31_custom_PerformanceStockOptionsMember" format="ixt:datemonthdayyearen" name="us-gaap:DebtInstrumentMaturityDate">December 15, 2021</ix:nonNumeric></span>, all of which were exercised prior to the expiration date.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">In
January 2021, the Company issued <span id="xdx_906_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_c20210101__20210131__srt--TitleOfIndividualAxis__custom--EmployeesAndExecutivesMember__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_z0Qxs80nHFF8" title="Share-based compensation options, grants in period, gross"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross" contextRef="From2021-01-012021-01-31_custom_EmployeesAndExecutivesMember_custom_PerformanceStockOptionsMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">344,723</ix:nonFraction></span> performance-based stock options to employees and executives. <span id="xdx_907_ecustom--StockOptionsVestingPeriodDescription_c20210101__20210131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember__srt--TitleOfIndividualAxis__custom--EmployeesAndExecutivesMember_zeMSnzrmH4ni" title="Stock options vesting period description"><ix:nonNumeric contextRef="From2021-01-012021-01-31_custom_EmployeesAndExecutivesMember_custom_PerformanceStockOptionsMember" name="OPTT:StockOptionsVestingPeriodDescription">The awards vest over 2 years provided
there is positive total shareholder return (e.g. share price increase) as measured by the closing share price on January 14, 2022 and
January 14, 2023.</ix:nonNumeric></span> There were <span id="xdx_909_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember__srt--TitleOfIndividualAxis__custom--EmployeesAndExecutivesMember_zRBCSkzPuKhc" title="Share-based compensation options, grants in period, gross"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross" contextRef="From2021-05-012022-01-31_custom_PerformanceStockOptionsMember_custom_EmployeesAndExecutivesMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">230,000</ix:nonFraction></span> shares unvested and outstanding at January 31, 2022. None of the shares granted to our former President
and CEO under this issuance vested prior to June 18, 2021, his last day of employment. These unvested shares are included in the Cancelled/forfeited
figure in the table below. A summary of performance stock options under our stock incentive plans is detailed in the following table.</span></p>

<ix:nonNumeric contextRef="From2021-05-012022-01-31_custom_PerformanceStockOptionsMember" escape="true" name="us-gaap:ScheduleOfShareBasedCompensationActivityTableTextBlock"><p id="xdx_89C_eus-gaap--ScheduleOfShareBasedCompensationActivityTableTextBlock_hus-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zsBGn3sj6mZ3" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_8BB_zwlWRkSpuRQa" style="display: none">Schedule of Stock Option Activity</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Shares
                                            </b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Underlying
         </b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Options
         </b></span></p></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Weighted</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Average</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Exercise</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Price</b></span></p></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Weighted</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Average</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Remaining</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Contractual</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Term</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(In
                                            Years)</b></span></p></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 45%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Outstanding
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    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_907_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_dtY_c20210501__20220131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zR57w3q9OVj" title="Weighted Average Remaining Contractual Term (In Years), Beginning"><ix:nonNumeric contextRef="From2021-05-012022-01-31_custom_PerformanceStockOptionsMember" format="ixt-sec:duryear" name="us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2">9.5</ix:nonNumeric></span></span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Granted</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td id="xdx_981_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zbLr6999tpSj" title="Shares Underlying Options Outstanding, Granted" style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross" contextRef="From2021-05-012022-01-31_custom_PerformanceStockOptionsMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">66,667</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td id="xdx_98A_eus-gaap--ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zAYnFuENvlW9" title="Weighted Average Exercise Price, Granted" style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice" contextRef="From2021-05-012022-01-31_custom_PerformanceStockOptionsMember" format="ixt:numdotdecimal" decimals="INF" unitRef="USDPShares">0.62</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Exercised</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td id="xdx_981_eus-gaap--StockIssuedDuringPeriodSharesStockOptionsExercised_iN_pid_di_c20210501__20220131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zKN4XIWDSAMg" title="Shares Underlying Options Outstanding, Exercised" style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(<ix:nonFraction name="us-gaap:StockIssuedDuringPeriodSharesStockOptionsExercised" contextRef="From2021-05-012022-01-31_custom_PerformanceStockOptionsMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">40,668</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">)</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
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    <td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Outstanding
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    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td id="xdx_98C_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_iE_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_z0YVn8VoTCR2" title="Shares Underlying Options Outstanding, Ending" style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber" contextRef="AsOf2022-01-31_custom_PerformanceStockOptionsMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">230,023</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td id="xdx_98F_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_iE_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zmjJERO74tbh" title="Weighted Average Exercise Price, Ending Balance" style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice" contextRef="AsOf2022-01-31_custom_PerformanceStockOptionsMember" format="ixt:numdotdecimal" decimals="INF" unitRef="USDPShares">2.26</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_908_ecustom--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm_dtY_c20210501__20220131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zgrPuzbbED14" title="Weighted Average Remaining Contractual Term (In Years), Ending"><ix:nonNumeric contextRef="From2021-05-012022-01-31_custom_PerformanceStockOptionsMember" format="ixt-sec:duryear" name="OPTT:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm">9.1</ix:nonNumeric></span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Exercisable
    as of January 31, 2022</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td id="xdx_981_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_iI_pid_c20220131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zRwUilKWg8f6" title="Shares Underlying Options Outstanding, Exercisable at Ending" style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span style="-sec-ix-hidden: xdx2ixbrl1487">&#8212;</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_904_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_dtY_c20210501__20220131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zYkatqvHiQX3" title="Weighted Average Remaining Contractual Term (In Years), Exercisable at Ending"><ix:nonNumeric contextRef="From2021-05-012022-01-31_custom_PerformanceStockOptionsMember" format="ixt-sec:duryear" name="us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1">0.0</ix:nonNumeric></span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  </table>

</ix:nonNumeric><p id="xdx_8A2_zfrN1x4xjgbk" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">As
of January 31, 2022, the total intrinsic value of both outstanding and exercisable options was approximately <span id="xdx_90C_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_iI_dc_c20220131__us-gaap--AwardTypeAxis__us-gaap--PerformanceSharesMember_zBEQ89GLkmud"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue" contextRef="AsOf2022-01-31_us-gaap_PerformanceSharesMember" format="ixt-sec:numwordsen" decimals="0" unitRef="USD">zero</ix:nonFraction></span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">.
As of January 31, 2022, approximately <span id="xdx_90A_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares_iI_pid_c20220131__us-gaap--AwardTypeAxis__us-gaap--PerformanceSharesMember_zWezoRw5IWR5"><ix:nonFraction name="us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares" contextRef="AsOf2022-01-31_us-gaap_PerformanceSharesMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">230,000</ix:nonFraction>
</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">options were unvested, which had an intrinsic
value of <span id="xdx_90C_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_iI_dc_c20220131__us-gaap--AwardTypeAxis__us-gaap--PerformanceSharesMember_zAOZzkuHKFl9"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue" contextRef="AsOf2022-01-31_us-gaap_PerformanceSharesMember" format="ixt-sec:numwordsen" decimals="0" unitRef="USD">zero
</ix:nonFraction></span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">and a weighted average remaining contractual
term of <span id="xdx_900_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1_dtY_c20210501__20220131__us-gaap--AwardTypeAxis__us-gaap--PerformanceSharesMember_zUFeUbgg79Jj"><ix:nonNumeric contextRef="From2021-05-012022-01-31_us-gaap_PerformanceSharesMember" format="ixt-sec:duryear" name="us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1">9.1</ix:nonNumeric>
</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">years. There was approximately $<span id="xdx_90C_eus-gaap--AllocatedShareBasedCompensationExpense_pp0p0_c20210501__20220131__us-gaap--AwardTypeAxis__us-gaap--PerformanceSharesMember_z9L4OV1YLVwc"><ix:nonFraction name="us-gaap:AllocatedShareBasedCompensationExpense" contextRef="From2021-05-012022-01-31_us-gaap_PerformanceSharesMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">123,000</ix:nonFraction>
</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">and $<span id="xdx_90E_eus-gaap--AllocatedShareBasedCompensationExpense_pp0p0_c20200501__20210131__us-gaap--AwardTypeAxis__us-gaap--PerformanceSharesMember_zc9oB0U8TA89"><ix:nonFraction name="us-gaap:AllocatedShareBasedCompensationExpense" contextRef="From2020-05-012021-01-31_us-gaap_PerformanceSharesMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">43,000</ix:nonFraction>
</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">of total recognized compensation cost related
to stock options during each of the nine months ended January 31, 2022 and 2021, respectively. As of January 31, 2022, there was approximately
$<span id="xdx_905_eus-gaap--EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions_c20220131__us-gaap--AwardTypeAxis__us-gaap--PerformanceSharesMember_pn5n6"><ix:nonFraction name="us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions" contextRef="AsOf2022-01-31_us-gaap_PerformanceSharesMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">242,000</ix:nonFraction>
</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">of total unrecognized compensation cost related
to non-vested stock options granted under the plans. This cost is expected to be recognized over a weighted-average period of <span id="xdx_904_eus-gaap--EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_dtY_c20210501__20220131__us-gaap--AwardTypeAxis__us-gaap--PerformanceSharesMember_z0YGbXUIF6Ff"><ix:nonNumeric contextRef="From2021-05-012022-01-31_us-gaap_PerformanceSharesMember" format="ixt-sec:duryear" name="us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1">1.1</ix:nonNumeric>
</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">years.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Restricted
Stock</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Compensation
expense for non-vested restricted stock is generally recorded based on its market value on the date of grant and recognized ratably over
the associated service and performance period. During the nine months ended January 31, 2022 and 2021, the Company granted <span id="xdx_904_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_zLyL07jC0jc"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" contextRef="From2021-05-012022-01-31_custom_NonVestedRestrictedStockMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">777,764</ix:nonFraction>
</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">and <span id="xdx_902_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_pid_c20200501__20210131__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_z6jh4LrEkM9k"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" contextRef="From2020-05-012021-01-31_custom_NonVestedRestrictedStockMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">10,000</ix:nonFraction>
</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">shares,</span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">
respectively, that were subject to service-based vesting requirements.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"></p>

<ix:exclude><!-- Field: Page; Sequence: 22; Value: 2 -->
    <div style="border-bottom: Black 1.5pt solid; margin-bottom: 6pt"><table cellpadding="0" cellspacing="0" style="border-collapse: collapse; width: 100%; font-size: 10pt"><tr style="vertical-align: top; text-align: left"><td style="text-align: center; width: 100%"><!-- Field: Sequence; Type: Arabic; Name: PageNo -->22<!-- Field: /Sequence --></td></tr></table></div>
    <div style="break-before: page; margin-top: 6pt"><table cellpadding="0" cellspacing="0" style="border-collapse: collapse; width: 100%; font-size: 10pt"><tr style="vertical-align: top; text-align: left"><td style="width: 100%"><a href="#toc_001">Table of Contents</a></td></tr></table></div>
    <!-- Field: /Page --></ix:exclude>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<ix:nonNumeric contextRef="From2021-05-01to2022-01-31" escape="true" name="us-gaap:ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityTableTextBlock"><p id="xdx_893_eus-gaap--ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityTableTextBlock_zQuOLPwbSsAg" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">A
summary of non-vested restricted stock under our stock incentive plans is as follows:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;<span id="xdx_8B0_zvGSHaVa6s6a" style="display: none">Schedule of Non-vested Restricted Stock Activity</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Number</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>of
                                            Shares</b></span></p></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Weighted</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Average
                                            Price per</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Share</b></span></p></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 64%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Issued
    and unvested at April 30, 2021</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td id="xdx_983_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_iS_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_ze7Z2QDf8j2b" title="Number of Shares, Issued and unvested, Beginning" style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" contextRef="AsOf2021-04-30_custom_NonVestedRestrictedStockMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">10,000</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td id="xdx_98F_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_iS_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_zoRAJ945JUeb" title="Weighted Average Price per Share, Issued and Unvested, Beginning" style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" contextRef="AsOf2021-04-30_custom_NonVestedRestrictedStockMember" format="ixt:numdotdecimal" decimals="INF" unitRef="USDPShares">2.93</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Granted</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td id="xdx_98D_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_zRQBpF0rN3bk" title="Number of Shares, Granted" style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" contextRef="From2021-05-012022-01-31_custom_NonVestedRestrictedStockMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">777,764</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td id="xdx_983_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_zGuHf0UmNwua" title="Weighted Average Price per Share, Granted" style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" contextRef="From2021-05-012022-01-31_custom_NonVestedRestrictedStockMember" format="ixt:numdotdecimal" decimals="INF" unitRef="USDPShares">1.42</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Vested</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td id="xdx_98C_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_iN_pid_di_c20210501__20220131__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_zzacWTXXIQn2" title="Number of Shares, Vested" style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(<ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod" contextRef="From2021-05-012022-01-31_custom_NonVestedRestrictedStockMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">10,000</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">)</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td id="xdx_986_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_zQQYIdEqq0p4" title="Weighted Average Price per Share, Vested" style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue" contextRef="From2021-05-012022-01-31_custom_NonVestedRestrictedStockMember" format="ixt:numdotdecimal" decimals="INF" unitRef="USDPShares">2.93</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Cancelled/forfeited</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td id="xdx_981_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_zDeqjNnbT3si" title="Number of Shares, Cancelled/forfeited" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span style="-sec-ix-hidden: xdx2ixbrl1515">&#8212;</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td id="xdx_980_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_zpLKFWhk7Rx9" title="Weighted Average Price per Share, Cancelled/forfeited" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span style="-sec-ix-hidden: xdx2ixbrl1517">&#8212;</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Issued
    and unvested at January 31, 2022</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td id="xdx_980_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_iE_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_z6uC7agcOCD" title="Number of Shares, Issued and Unvested, Ending" style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" contextRef="AsOf2022-01-31_custom_NonVestedRestrictedStockMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">777,764</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td id="xdx_982_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_iE_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_z3ZlSS1WJbF2" title="Weighted Average Price per Share, Issued and Unvested, Ending" style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" contextRef="AsOf2022-01-31_custom_NonVestedRestrictedStockMember" format="ixt:numdotdecimal" decimals="INF" unitRef="USDPShares">1.42</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  </table>

</ix:nonNumeric><p id="xdx_8A8_z0ybN5zc3oi4" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">There
was approximately $<span id="xdx_906_eus-gaap--AllocatedShareBasedCompensationExpense_pp0p0_c20210501__20220131__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_zBcwBrnBDoW6" title="Share-based payment arrangement, expense"><ix:nonFraction name="us-gaap:AllocatedShareBasedCompensationExpense" contextRef="From2021-05-012022-01-31_us-gaap_RestrictedStockMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">43,000</ix:nonFraction></span>
and $<span id="xdx_905_eus-gaap--AllocatedShareBasedCompensationExpense_pp0p0_c20200501__20210131__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_zXYEprwGorLf" title="Share-based payment arrangement, expense"><ix:nonFraction name="us-gaap:AllocatedShareBasedCompensationExpense" contextRef="From2020-05-012021-01-31_us-gaap_RestrictedStockMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">12,000</ix:nonFraction></span>
of total recognized compensation cost related to restricted stock for the nine months ended January 31, 2022 and 2021, respectively.
As of January 31, 2022, there is approximately $<span id="xdx_902_eus-gaap--EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_iI_pp0p0_c20220131__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_z7800wMVYQUl" title="Unrecognized compensation cost"><ix:nonFraction name="us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions" contextRef="AsOf2022-01-31_us-gaap_RestrictedStockMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">54,000</ix:nonFraction></span>
of unrecognized compensation cost remaining related to unvested restricted stock granted under our plans. This cost is expected to
be recognized over a weighted-average period of approximately <span id="xdx_903_eus-gaap--EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_dtY_c20210501__20220131__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_zeU7becczWZ6" title="Share-based compensation of weighted-average period"><ix:nonNumeric contextRef="From2021-05-012022-01-31_us-gaap_RestrictedStockMember" format="ixt-sec:duryear" name="us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1">1.4</ix:nonNumeric></span>
years.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">In
December 2019, the Company granted <span id="xdx_90B_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_pid_c20210501__20220131__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember__srt--TitleOfIndividualAxis__custom--EmployeeMember__srt--StatementScenarioAxis__custom--SubjectToServiceBasedVestingRequirementsMember_zZCWVPmFWna" title="Restricted stock option granted"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" contextRef="From2021-05-012022-01-31_us-gaap_EmployeeStockOptionMember_custom_EmployeeMember_custom_SubjectToServiceBasedVestingRequirementsMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">51,547</ix:nonFraction></span> shares to an employee, subject to service-based vesting requirements, that were outside the
Company stock incentive plans. There was approximately <span id="xdx_904_eus-gaap--AllocatedShareBasedCompensationExpense_pp0p0_dc_c20210501__20220131__us-gaap--AwardTypeAxis__us-gaap--StockOptionMember__srt--TitleOfIndividualAxis__custom--EmployeeMember__srt--StatementScenarioAxis__custom--SubjectToServiceBasedVestingRequirementsMember_zQwlTKbGZKA8" title="Share-based payment arrangement, expense"><ix:nonFraction name="us-gaap:AllocatedShareBasedCompensationExpense" contextRef="From2021-05-012022-01-31_us-gaap_StockOptionMember_custom_EmployeeMember_custom_SubjectToServiceBasedVestingRequirementsMember" format="ixt-sec:numwordsen" decimals="0" scale="0" unitRef="USD">zero</ix:nonFraction></span> and $<span id="xdx_90D_eus-gaap--AllocatedShareBasedCompensationExpense_pp0p0_c20200501__20210131__us-gaap--AwardTypeAxis__us-gaap--StockOptionMember__srt--TitleOfIndividualAxis__custom--EmployeeMember__srt--StatementScenarioAxis__custom--SubjectToServiceBasedVestingRequirementsMember_zReJgHF5df49" title="Share-based payment arrangement, expense"><ix:nonFraction name="us-gaap:AllocatedShareBasedCompensationExpense" contextRef="From2020-05-012021-01-31_us-gaap_StockOptionMember_custom_EmployeeMember_custom_SubjectToServiceBasedVestingRequirementsMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">30,000</ix:nonFraction></span> of total recognized compensation cost related to this award for
the three months ended January 31, 2022 and 2021, respectively. As of January 31, 2022, there was <span id="xdx_904_eus-gaap--EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions_iI_pp0p0_do_c20220131__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember__srt--TitleOfIndividualAxis__custom--EmployeeMember__srt--StatementScenarioAxis__custom--SubjectToServiceBasedVestingRequirementsMember_zazTO3GsWw7f" title="Unrecognized compensation cost related to non-vested stock"><ix:nonFraction name="us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions" contextRef="AsOf2022-01-31_us-gaap_EmployeeStockOptionMember_custom_EmployeeMember_custom_SubjectToServiceBasedVestingRequirementsMember" format="ixt-sec:numwordsen" decimals="0" scale="0" unitRef="USD">no</ix:nonFraction></span> unrecognized compensation cost remaining
related to this award.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

</ix:nonNumeric><ix:nonNumeric contextRef="From2021-05-01to2022-01-31" escape="true" name="us-gaap:FairValueDisclosuresTextBlock"><p id="xdx_806_eus-gaap--FairValueDisclosuresTextBlock_zk6lv0GKpfqd" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(14)
<span id="xdx_827_zXSgzeGfvhS4">Fair Value Measurements</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>&#160;</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">ASC
Topic 820, &#8220;<i>Fair Value Measurements&#8221;</i> states that fair value is an exit price, representing the amount that would be
received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date.
Assets and liabilities that are measured at fair value are reported using a three-level fair value hierarchy that prioritizes the inputs
used to measure fair value. This hierarchy maximizes the use of observable input and minimizes the use of unobservable inputs. The following
is a description of the three hierarchy levels.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<table cellspacing="0" cellpadding="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
  <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify; width: 0.65in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Level
  1</span></td>
  <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Unadjusted
  quoted prices in active markets for identical assets or liabilities that the Company has the ability to access at the measurement date.</span></td></tr>

<tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
  <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
  <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
<tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
  <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Level
  2</span></td>
  <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Inputs
  other than quoted prices in active markets that are observable for the asset or liability, either directly or indirectly.</span></td></tr>

<tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
  <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
  <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
<tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
  <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Level
  3</span></td>
  <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Inputs
  that are unobservable for the asset or liability.</span></td></tr>
</table>


<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 45pt; text-align: justify; text-indent: -45pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Disclosure
of Fair Values</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company&#8217;s financial instruments that are not re-measured at fair value include cash, cash equivalents, restricted cash, accounts
receivable, contract assets and liabilities, deposits, accounts payable, and accrued expenses. The carrying values of these financial
instruments approximate their fair values and are viewed as Level 1 items. The Company&#8217;s warrant liabilities represent the only
asset or liability classified financial instrument that is measured at fair value on a recurring basis.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
fair value of the Company&#8217;s warrant liabilities (refer to Note 8) is based on the Black-Scholes pricing model which is based on
Level 3 unobservable inputs for which there is little or no market data, requiring the Company to develop its own assumptions. The assumptions
used by the Company are the quoted price of the Company&#8217;s common stock in an active market, risk-free interest rate, volatility
and expected life, and assumes no dividends. Volatility is based on the actual market activity of the Company&#8217;s stock. The expected
life is based on the remaining contractual term of the warrants and the risk-free interest rate is based on the implied yield available
on U.S. Treasury Securities with a maturity equivalent to the warrants&#8217; expected life. The fair value on a recurring basis as of
January 31, 2022 and April 30, 2021 was near <span id="xdx_90F_eus-gaap--FairValueNetAssetLiability_iI_dc_c20220131_zPSAHAmKwz5e" title="Fair value on a recurring basis"><span id="xdx_90D_eus-gaap--FairValueNetAssetLiability_iI_dc_c20210430_zA9MSc24JGje"><ix:nonFraction name="us-gaap:FairValueNetAssetLiability" contextRef="AsOf2022-01-31" format="ixt-sec:numwordsen" decimals="0" unitRef="USD"><ix:nonFraction name="us-gaap:FairValueNetAssetLiability" contextRef="AsOf2021-04-30" format="ixt-sec:numwordsen" decimals="0" unitRef="USD">zero</ix:nonFraction></ix:nonFraction></span></span>.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"></p>

<ix:exclude><!-- Field: Page; Sequence: 23; Value: 2 -->
    <div style="border-bottom: Black 1.5pt solid; margin-bottom: 6pt"><table cellpadding="0" cellspacing="0" style="border-collapse: collapse; width: 100%; font-size: 10pt"><tr style="vertical-align: top; text-align: left"><td style="text-align: center; width: 100%"><!-- Field: Sequence; Type: Arabic; Name: PageNo -->23<!-- Field: /Sequence --></td></tr></table></div>
    <div style="break-before: page; margin-top: 6pt"><table cellpadding="0" cellspacing="0" style="border-collapse: collapse; width: 100%; font-size: 10pt"><tr style="vertical-align: top; text-align: left"><td style="width: 100%"><a href="#toc_001">Table of Contents</a></td></tr></table></div>
    <!-- Field: /Page --></ix:exclude>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">There
were no unrealized gains or losses for the three and nine months ended January 31, 2022 or 2021. When incurred, gains and losses are
included within &#8220;Gain (loss) due to change in fair value of warrant liabilities&#8221; in the Consolidated Statements of Operations.
The Company determined the fair value using the Black-Scholes pricing model with the following assumptions:</span></p>

<ix:nonNumeric contextRef="From2021-05-01to2022-01-31" escape="true" name="OPTT:ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionTableTextBlock"><p id="xdx_89F_ecustom--ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionTableTextBlock_zNrIMIELlQZd" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;<span id="xdx_8BE_zDeU3UdWaWYd" style="display: none">Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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    31, 2021</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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    <td colspan="2" style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 64%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Dividend
    rate</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">N/A</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td id="xdx_987_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_pid_dp_c20200501__20210131_zWyPY86aGpqh" title="Dividend rate" style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate" contextRef="From2020-05-012021-01-31" format="ixt:numdotdecimal" decimals="INF" scale="-2" unitRef="Pure">0.0</ix:nonFraction></span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">%</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Risk-free
    rate</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">N/A
                                            - N/A</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_90B_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_pid_dp_c20200501__20210131__srt--RangeAxis__srt--MinimumMember_z9JKL4coD543" title="Risk-free interest rate"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate" contextRef="From2020-05-012021-01-31_srt_MinimumMember" format="ixt:numdotdecimal" decimals="INF" scale="-2" unitRef="Pure">0.07</ix:nonFraction></span>%
                                            - <span id="xdx_900_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_pid_dp_c20200501__20210131__srt--RangeAxis__srt--MaximumMember_zHWeCICoZjw8" title="Risk-free interest rate"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate" contextRef="From2020-05-012021-01-31_srt_MaximumMember" format="ixt:numdotdecimal" decimals="INF" scale="-2" unitRef="Pure">0.08</ix:nonFraction></span>%</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Expected
    life (years)</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">N/A</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_90B_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_dtY_c20200501__20210131__srt--RangeAxis__srt--MinimumMember_znLxIiTvp2d1" title="Expected life (in years)"><ix:nonNumeric contextRef="From2020-05-012021-01-31_srt_MinimumMember" format="ixt-sec:duryear" name="us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1">0.5</ix:nonNumeric></span>
                                            - <span id="xdx_90D_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_dtY_c20200501__20210131__srt--RangeAxis__srt--MaximumMember_zgypZz5666vi" title="Expected life (in years)"><ix:nonNumeric contextRef="From2020-05-012021-01-31_srt_MaximumMember" format="ixt-sec:duryear" name="us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1">0.8</ix:nonNumeric></span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Expected
    volatility</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">N/A</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_902_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_pid_dp_uPure_c20200501__20210131_zjzG36IBtaL9" title="Expected volatility"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate" contextRef="From2020-05-012021-01-31" format="ixt:numdotdecimal" decimals="INF" scale="-2" unitRef="Pure">146.1</ix:nonFraction></span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">%</span></td></tr>
  </table>

</ix:nonNumeric><p id="xdx_8AD_zV3eA4hLrsHa" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Transfers
into or out of any hierarchy level are recognized at the end of the reporting period in which the transfers occurred. There were no transfers
between any hierarchy levels during each of the three and nine months ended January 31, 2022 or 2021.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

</ix:nonNumeric><ix:nonNumeric contextRef="From2021-05-01to2022-01-31" escape="true" name="us-gaap:CommitmentsAndContingenciesDisclosureTextBlock"><p id="xdx_80A_eus-gaap--CommitmentsAndContingenciesDisclosureTextBlock_zkDBzammzTh5" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(15)
<span id="xdx_826_zvaYjfUo89kb">Commitments and Contingencies</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>&#160;</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Employment
Litigation </i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>&#160;</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">On
August 28, 2018, counsel for Charles Dunleavy, the Company&#8217;s former President &amp; Chief Executive Officer who was terminated
for cause effective June 9, 2014, filed a demand for arbitration, captioned Charles F. Dunleavy v. Ocean Power Technologies, Inc., Case
No. 01-18-0003-2374, before the American Arbitration Association in New Jersey. The demand alleged various claims relating to Mr. Dunleavy&#8217;s
termination. After the hearings in the proceeding were conducted, on December 11, 2020, the arbitration panel issued an interim award
finding, among other things, that the termination for cause of Mr. Dunleavy was in breach of his employment contract and awarded him
compensatory damages in the amount of $<span id="xdx_90F_eus-gaap--LossContingencyDamagesSoughtValue_pp2p0_c20180827__20180828__us-gaap--RelatedPartyTransactionsByRelatedPartyAxis__custom--CharlesFDunleavyMember_zj01hPvLMX59" title="Loss contingency, damages sought, value"><ix:nonFraction name="us-gaap:LossContingencyDamagesSoughtValue" contextRef="From2018-08-272018-08-28_custom_CharlesFDunleavyMember" format="ixt:numdotdecimal" decimals="2" scale="0" unitRef="USD">438,254.54</ix:nonFraction></span>. On May 3, 2021, the panel issued a second interim award and therein awarded Mr. Dunleavy
attorneys&#8217; fees, costs and pre-judgment interest. The Company agreed, on May 24, 2021, to pay Mr. Dunleavy $<span id="xdx_90D_eus-gaap--LossContingencyDamagesSoughtValue_pp2p0_c20210523__20210524__us-gaap--RelatedPartyTransactionsByRelatedPartyAxis__custom--CharlesFDunleavyMember_zvXV4dNfGOtk" title="Loss contingency, damages sought, value"><ix:nonFraction name="us-gaap:LossContingencyDamagesSoughtValue" contextRef="From2021-05-232021-05-24_custom_CharlesFDunleavyMember" format="ixt:numdotdecimal" decimals="2" scale="0" unitRef="USD">1,223,963.14</ix:nonFraction></span>, representing
the total compensatory damages, attorneys&#8217; fees, costs and pre-judgment interest, which is the full amount awarded by the arbitration
panel. The Company made the required payment on May 26, 2021, and the matter is now closed.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Spain
Income Tax Audit</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>&#160;</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company underwent an income tax audit in Spain for the period from 2011 to 2014, when our Spanish branch was closed. On July 30, 2018,
the Spanish tax inspector concluded that although there was no tax owed in light of losses reported, the Company&#8217;s Spanish branch
owed penalties for failure to properly account for the income associated with the funding grant. During the nine months ended January
31, 2021, the Company received notice from the Spanish Central Economic and Administrative Tribunal that it agreed with the inspector
and ruled that the Company owes the full amount of the penalty in the amount of &#8364;<span id="xdx_901_eus-gaap--IncomeTaxExaminationPenaltiesAndInterestAccrued_iI_pp0p0_uEuro_c20210131__us-gaap--IncomeStatementLocationAxis__us-gaap--SellingGeneralAndAdministrativeExpensesMember__us-gaap--IncomeTaxAuthorityNameAxis__us-gaap--TaxAuthoritySpainMember_zCI5gOd7amHc" title="Income tax penalties"><ix:nonFraction name="us-gaap:IncomeTaxExaminationPenaltiesAndInterestAccrued" contextRef="AsOf2021-01-31_us-gaap_SellingGeneralAndAdministrativeExpensesMember_us-gaap_TaxAuthoritySpainMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="Euro">279,870</ix:nonFraction></span> or approximately $<span id="xdx_908_eus-gaap--IncomeTaxExaminationPenaltiesAndInterestAccrued_iI_pp0p0_c20210131__us-gaap--IncomeStatementLocationAxis__us-gaap--SellingGeneralAndAdministrativeExpensesMember__us-gaap--IncomeTaxAuthorityNameAxis__us-gaap--TaxAuthoritySpainMember_zmf1ZljMw74f" title="Income tax penalties"><ix:nonFraction name="us-gaap:IncomeTaxExaminationPenaltiesAndInterestAccrued" contextRef="AsOf2021-01-31_us-gaap_SellingGeneralAndAdministrativeExpensesMember_us-gaap_TaxAuthoritySpainMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">331,000</ix:nonFraction></span>. On January 25,
2021, the Company paid the Spanish Tax Administration &#8364;<span id="xdx_906_eus-gaap--IncomeTaxExaminationPenaltiesAndInterestAccrued_iI_pp0p0_uEuro_c20210125__us-gaap--IncomeStatementLocationAxis__us-gaap--SellingGeneralAndAdministrativeExpensesMember__us-gaap--IncomeTaxAuthorityNameAxis__us-gaap--TaxAuthoritySpainMember_zq8RRGcAdLsj" title="Income tax penalties"><ix:nonFraction name="us-gaap:IncomeTaxExaminationPenaltiesAndInterestAccrued" contextRef="AsOf2021-01-25_us-gaap_SellingGeneralAndAdministrativeExpensesMember_us-gaap_TaxAuthoritySpainMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="Euro">279,870</ix:nonFraction></span>. Notwithstanding that payment, on April 30, 2021, the Company filed
its appeal of the decision of the Central Court to the Spanish National Court. There is no schedule for a ruling from the Spanish National
Court.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

</ix:nonNumeric><ix:nonNumeric contextRef="From2021-05-01to2022-01-31" escape="true" name="us-gaap:IncomeTaxDisclosureTextBlock"><p id="xdx_80E_eus-gaap--IncomeTaxDisclosureTextBlock_zelmQyUhowv1" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(16)
<span id="xdx_82C_z1TOwrFCjXG2">Income Taxes</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>&#160;</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Uncertain
Tax Positions</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company applies the guidance issued by the FASB for the accounting and reporting of uncertain tax positions. The guidance requires the
Company to recognize in its consolidated financial statements the impact of a tax position if that position is more likely than not to
be sustained upon examination, based on the technical merits of the position. At January 31, 2022, the Company had no unrecognized tax
positions. The Company does not expect any material increase or decrease in its income tax expense in the next twelve months, related
to examinations or uncertain tax positions. U.S. federal and state income tax returns were audited through fiscal 2014 and fiscal 2010
respectively. Net operating loss and credit carry forwards since inception remain open to examination by taxing authorities and will
continue to remain open for a period of time after utilization.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"></p>

<ix:exclude><!-- Field: Page; Sequence: 24; Value: 2 -->
    <div style="border-bottom: Black 1.5pt solid; margin-bottom: 6pt"><table cellpadding="0" cellspacing="0" style="border-collapse: collapse; width: 100%; font-size: 10pt"><tr style="vertical-align: top; text-align: left"><td style="text-align: center; width: 100%"><!-- Field: Sequence; Type: Arabic; Name: PageNo -->24<!-- Field: /Sequence --></td></tr></table></div>
    <div style="break-before: page; margin-top: 6pt"><table cellpadding="0" cellspacing="0" style="border-collapse: collapse; width: 100%; font-size: 10pt"><tr style="vertical-align: top; text-align: left"><td style="width: 100%"><a href="#toc_001">Table of Contents</a></td></tr></table></div>
    <!-- Field: /Page --></ix:exclude>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Income
Tax Benefit</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company sold New Jersey State net operating losses and research development credits under the NJEDA Tax Transfer program in the amount
of approximately $<span id="xdx_902_eus-gaap--OperatingIncomeLoss_pn5n6_c20200501__20210430_z0sBB1UGo5Kc"><ix:nonFraction name="us-gaap:OperatingIncomeLoss" contextRef="From2020-05-012021-04-30" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">12.0</ix:nonFraction>
</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">million for the year ended April 30, 2021, for
net proceeds of approximately $<span id="xdx_907_eus-gaap--ProceedsFromDebtNetOfIssuanceCosts_pn5n6_c20200501__20210430_zqmomDTqenQf"><ix:nonFraction name="us-gaap:ProceedsFromDebtNetOfIssuanceCosts" contextRef="From2020-05-012021-04-30" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">1.0</ix:nonFraction>
</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">million which was received in May 2021 and recorded
in the Company&#8217;s Statement of Operations in fiscal year 2022. <span style="background-color: white">This results from a program
where New Jersey-based technology or biotechnology companies with fewer than 225 US employees may be eligible to sell net operating losses
and research and development tax credits to unaffiliated corporations, up to a maximum lifetime benefit of $<span id="xdx_906_eus-gaap--OperatingIncomeLoss_pn5n6_c20200501__20210430__srt--TitleOfIndividualAxis__custom--USEmployeesMember_zYZltBHHCqbi"><ix:nonFraction name="us-gaap:OperatingIncomeLoss" contextRef="From2020-05-012021-04-30_custom_USEmployeesMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">20.0</ix:nonFraction>
</span></span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt; background-color: white">million
per business. As of January 31, 2022 we have approximately $<span id="xdx_90D_eus-gaap--OperatingIncomeLoss_pn5n6_c20210501__20220430_z5gPxIj8U6Yb"><ix:nonFraction name="us-gaap:OperatingIncomeLoss" contextRef="From2021-05-012022-04-30" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">5.0</ix:nonFraction>
</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt; background-color: white">million still
available to sell should we chose to do so.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

</ix:nonNumeric><ix:nonNumeric contextRef="From2021-05-01to2022-01-31" escape="true" name="us-gaap:SegmentReportingDisclosureTextBlock"><p id="xdx_804_eus-gaap--SegmentReportingDisclosureTextBlock_zwaJGiyqFWOd" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(17)
<span id="xdx_822_zKmQ4i11p7Lj">Operating Segments and Geographic Information</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>&#160;</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company&#8217;s business consists of <span id="xdx_905_eus-gaap--NumberOfOperatingSegments_pid_dc_uSegment_c20210501__20220131_zEONvlLmNe46"><ix:nonFraction name="us-gaap:NumberOfOperatingSegments" contextRef="From2021-05-01to2022-01-31" format="ixt-sec:numwordsen" decimals="INF" unitRef="Segment">one
</ix:nonFraction></span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">segment as this represents how our Chief Operating
Decision Maker views the Company&#8217;s operations and financial position. The Company operates on a worldwide basis with two
wholly-owned subsidiaries, 3Dent and MAR, and subsidiaries in the UK and in Australia. Revenues and expenses are generally attributed
to the operating company that bills the customers. During each of the nine months ended January 31, 2022 and 2021, the Company&#8217;s
primary business operations were in North America.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

</ix:nonNumeric><ix:nonNumeric contextRef="From2021-05-01to2022-01-31" escape="true" name="us-gaap:BusinessCombinationDisclosureTextBlock"><p id="xdx_80F_eus-gaap--BusinessCombinationDisclosureTextBlock_zJoPAycELxV3" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(18)
<span id="xdx_82B_zDJXGqRmabqe">Business Combination</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>&#160;</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>3dent
Technologies, LLC</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>&#160;</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">On
February 1, 2021, the Company acquired all of the outstanding equity interest of 3dent Technologies, LLC (&#8220;3Dent&#8221;), a Houston,
Texas based company that offers offshore energy engineering and design services that are complementary to the Company&#8217;s technology
and products. As consideration for the purchase, the Company issued <span id="xdx_905_eus-gaap--StockIssuedDuringPeriodSharesAcquisitions_pid_c20210130__20210201__us-gaap--BusinessAcquisitionAxis__custom--ThreeDentAcquisitionMember_zstBYe769FC8"><ix:nonFraction name="us-gaap:StockIssuedDuringPeriodSharesAcquisitions" contextRef="From2021-01-302021-02-01_custom_ThreeDentAcquisitionMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">361,991</ix:nonFraction>
</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">shares of its common stock to the sellers, subject
to a 12-month post acquisition employment condition, which has now been achieved. In addition, the former owners of 3Dent would have
been eligible for awards of performance stock with a potential value of $<span id="xdx_909_eus-gaap--StockIssuedDuringPeriodValueAcquisitions_pp0p0_c20210130__20210201__us-gaap--BusinessAcquisitionAxis__custom--ThreeDentAcquisitionMember_z87blyFe1db4"><ix:nonFraction name="us-gaap:StockIssuedDuringPeriodValueAcquisitions" contextRef="From2021-01-302021-02-01_custom_ThreeDentAcquisitionMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">360,000</ix:nonFraction>
</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">if certain revenue targets are achieved over
the 12 month-period post acquisition. As of January 31, 2022, it was determined that 3Dent did not meet these
revenue targets.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"></span></p>
<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Marine
Advance Robotics, Inc.</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>&#160;</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">On
November 15, 2021, the Company acquired all of the outstanding equity interest of Marine Advanced Robotics, Inc. (&#8220;MAR&#8221;),
a Richmond (San Francisco Bay Area), California-based developer and manufacturer of autonomous surface vehicles.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company accounted for the transaction as a business combination under ASC 805, <i>&#8220;Business Combinations.&#8221; </i>Accordingly,
the assets and liabilities acquired were recorded at their estimated fair value on the date of acquisition. Under ASC 805, acquisition-related
transaction costs of approximately $<span id="xdx_908_eus-gaap--BusinessCombinationAcquisitionRelatedCosts_pn5n6_c20210501__20220131_zit1szN38eHc" title="Acquisition related costs"><ix:nonFraction name="us-gaap:BusinessCombinationAcquisitionRelatedCosts" contextRef="From2021-05-01to2022-01-31" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">0.3</ix:nonFraction></span> million (such as advisory, legal, valuation, other professional fees) were expensed in the Consolidated
Statement of Operations in the period incurred.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company paid cash consideration of $<span id="xdx_902_eus-gaap--PaymentsToAcquireBusinessesGross_pn5n6_c20211114__20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvancedRoboticsIncMember_zRwrT74QqaMc"><ix:nonFraction name="us-gaap:PaymentsToAcquireBusinessesGross" contextRef="From2021-11-142021-11-15_custom_MarineAdvancedRoboticsIncMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">4.0</ix:nonFraction> </span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">million
and issued <span id="xdx_906_eus-gaap--BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_pid_c20211114__20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvancedRoboticsIncMember__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_zfAhFnUNp6vi"><ix:nonFraction name="us-gaap:BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued" contextRef="From2021-11-142021-11-15_custom_MarineAdvancedRoboticsIncMember_us-gaap_RestrictedStockMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">3,330,162</ix:nonFraction> </span></span> <span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">shares
of our</span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"> common stock valued at <span id="xdx_901_eus-gaap--BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned_iI_pn5n6_c20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvancedRoboticsIncMember__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_zIvtrzQPzLr7">approximately
$<ix:nonFraction name="us-gaap:BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned" contextRef="AsOf2021-11-15_custom_MarineAdvancedRoboticsIncMember_us-gaap_RestrictedStockMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">5.9</ix:nonFraction></span></span> <span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">million based on the closing
price of $<span id="xdx_90F_eus-gaap--BusinessAcquisitionSharePrice_iI_pid_c20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvancedRoboticsIncMember__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_zvGEfnDzCOqg"><ix:nonFraction name="us-gaap:BusinessAcquisitionSharePrice" contextRef="AsOf2021-11-15_custom_MarineAdvancedRoboticsIncMember_us-gaap_RestrictedStockMember" format="ixt:numdotdecimal" decimals="INF" unitRef="USDPShares">2.10</ix:nonFraction>
and </span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">reduced by a lack of
marketability discount since they were restricted. The Company assumed liability for advances payable to the former owners
of MAR for approximately $456,000.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
contingent consideration is based on the achievement of certain milestones over a 30-month period. As of the acquisition date, the
contingent consideration had a fair value of $<span id="xdx_908_eus-gaap--BusinessCombinationContingentConsiderationAsset_iI_pn5n6_c20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvancedRoboticsIncMember_zKAEXOrVQcTb"><ix:nonFraction name="us-gaap:BusinessCombinationContingentConsiderationAsset" contextRef="AsOf2021-11-15_custom_MarineAdvancedRoboticsIncMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">1.6</ix:nonFraction> </span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">million.
Under the terms of the MAR purchase agreement, <span id="xdx_905_eus-gaap--BusinessAcquisitionProFormaInformationDescription_c20211114__20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvancedRoboticsIncMember_z65nc7cCn45l" title="Business combination, description"><ix:nonNumeric contextRef="From2021-11-142021-11-15_custom_MarineAdvancedRoboticsIncMember" name="us-gaap:BusinessAcquisitionProFormaInformationDescription">the
contingent consideration consists of two earn-out periods, one running from the date of the acquisition through April 30, 2023 in
which the maximum earn-out is $1.5 million and the other from May 1, 2023 through April 30, 2024 where the maximum earn-out is $2
million. The fair value as of the date of acquisition was determined using a simulation model based on an estimate of revenues
during these periods and discount factors ranging from 5.8% to 14.5%.</ix:nonNumeric></span> As discussed in Note 14 per ASC Topic 820 we consider
this to be a Level 3 liability.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>
<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Total
consid</span>eration including cash, restricted shares, liabilities assumed, and contingent consideration was valued at
approximately $<span id="xdx_902_eus-gaap--BusinessCombinationConsiderationTransferred1_pn5n6_c20211114__20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvancedRoboticsIncMember_zGyyHjpqPvT9"><ix:nonFraction name="us-gaap:BusinessCombinationConsiderationTransferred1" contextRef="From2021-11-142021-11-15_custom_MarineAdvancedRoboticsIncMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">11.9</ix:nonFraction> </span>million.</p>
<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"></p>

<ix:exclude><!-- Field: Page; Sequence: 25; Value: 2 -->
    <div style="border-bottom: Black 1.5pt solid; margin-bottom: 6pt"><table cellpadding="0" cellspacing="0" style="border-collapse: collapse; width: 100%; font-size: 10pt"><tr style="vertical-align: top; text-align: left"><td style="text-align: center; width: 100%"><!-- Field: Sequence; Type: Arabic; Name: PageNo -->25<!-- Field: /Sequence --></td></tr></table></div>
    <div style="break-before: page; margin-top: 6pt"><table cellpadding="0" cellspacing="0" style="border-collapse: collapse; width: 100%; font-size: 10pt"><tr style="vertical-align: top; text-align: left"><td style="width: 100%"><a href="#toc_001">Table of Contents</a></td></tr></table></div>
    <!-- Field: /Page --></ix:exclude>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"></span></p>

<ix:nonNumeric contextRef="From2021-05-01to2022-01-31" escape="true" name="us-gaap:ScheduleOfBusinessAcquisitionsByAcquisitionContingentConsiderationTextBlock"><p id="xdx_892_eus-gaap--ScheduleOfBusinessAcquisitionsByAcquisitionContingentConsiderationTextBlock_zk0exgbolm37" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Purchase
consideration consisted of the following:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;<span id="xdx_8B7_zL6lB3OeLppl" style="display: none">Schedule
of Purchase Consideration</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 80%">
  <tr style="vertical-align: bottom">
    <td style="padding-bottom: 1pt">&#160;</td><td style="padding-bottom: 1pt">&#160;</td>
    <td colspan="2" style="border-bottom: Black 1pt solid; text-align: center">(in thousands)</td><td style="padding-bottom: 1pt">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="width: 78%">Cash</td><td style="width: 2%">&#160;</td>
    <td style="width: 1%; text-align: left">$</td><td id="xdx_987_eus-gaap--PaymentsToAcquireBusinessesGross_pn3n3_c20211114__20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvancedRoboticsIncMember_zAC7R75eClFk" title="Cash" style="width: 18%; text-align: right"><ix:nonFraction name="us-gaap:PaymentsToAcquireBusinessesGross" contextRef="From2021-11-142021-11-15_custom_MarineAdvancedRoboticsIncMember" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">4,000</ix:nonFraction></td><td style="width: 1%; text-align: left">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td style="text-align: left">Liabilities assumed</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td id="xdx_98A_eus-gaap--BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_c20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvancedRoboticsIncMember_pn3n3" title="Liabilities assumed" style="text-align: right"><ix:nonFraction name="us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities" contextRef="AsOf2021-11-15_custom_MarineAdvancedRoboticsIncMember" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">456</ix:nonFraction></td><td style="text-align: left">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td>Fair value of restricted shares</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td id="xdx_986_eus-gaap--BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_pn3n3_c20211114__20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvancedRoboticsIncMember_z2X9CcrrX7qg" title="Fair value of restricted shares" style="text-align: right"><ix:nonFraction name="us-gaap:BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable" contextRef="From2021-11-142021-11-15_custom_MarineAdvancedRoboticsIncMember" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">5,855</ix:nonFraction></td><td style="text-align: left">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td style="padding-bottom: 1pt">Fair value of contingent consideration</td><td style="padding-bottom: 1pt">&#160;</td>
    <td style="border-bottom: Black 1pt solid; text-align: left">&#160;</td><td id="xdx_98C_eus-gaap--BusinessCombinationContingentConsiderationAsset_c20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvancedRoboticsIncMember_pn3n3" title="Fair value of contingent consideration" style="border-bottom: Black 1pt solid; text-align: right"><ix:nonFraction name="us-gaap:BusinessCombinationContingentConsiderationAsset" contextRef="AsOf2021-11-15_custom_MarineAdvancedRoboticsIncMember" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">1,591</ix:nonFraction></td><td style="padding-bottom: 1pt; text-align: left">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="padding-bottom: 2.5pt; text-align: left">Total consideration</td><td style="padding-bottom: 2.5pt">&#160;</td>
    <td style="border-bottom: Black 2.5pt double; text-align: left">$</td><td id="xdx_98A_eus-gaap--BusinessCombinationConsiderationTransferred1_pn3n3_c20211114__20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvancedRoboticsIncMember_zjM5zKnEr232" title="Total consideration" style="border-bottom: Black 2.5pt double; text-align: right"><ix:nonFraction name="us-gaap:BusinessCombinationConsiderationTransferred1" contextRef="From2021-11-142021-11-15_custom_MarineAdvancedRoboticsIncMember" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">11,902</ix:nonFraction></td><td style="padding-bottom: 2.5pt; text-align: left">&#160;</td></tr>
  </table>

</ix:nonNumeric><p id="xdx_8A9_z5NIg0ZrRH1d" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"></p>

<ix:nonNumeric contextRef="From2021-05-01to2022-01-31" escape="true" name="us-gaap:ScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedTableTextBlock"><p id="xdx_89F_eus-gaap--ScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedTableTextBlock_zA8Uzs4chd34" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
preliminary allocation of the fair value of the MAR acquisition is shown in the table below. The allocation of the fair value will be
finalized when the valuation is completed, and the differences will be trued up for the final allocated amounts, hence, actual results may differ from preliminary estimate.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_8BF_zbQMjUdwsWa7" style="display: none">Schedule
of Allocated Fair Value of Purchase Consideration</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 80%">
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="padding-bottom: 1pt; width: 78%; text-align: left">Total Purchase Consideration</td><td style="padding-bottom: 1pt; width: 2%">&#160;</td>
    <td style="border-bottom: Black 1pt solid; width: 1%; text-align: left">$</td><td id="xdx_98D_eus-gaap--BusinessCombinationConsiderationTransferred1_pn3n3_c20211114__20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvancedRoboticsIncMember_zX5kdPw2dvmj" title="Total Purchase Consideration" style="border-bottom: Black 1pt solid; width: 18%; text-align: right"><ix:nonFraction name="us-gaap:BusinessCombinationConsiderationTransferred1" contextRef="From2021-11-142021-11-15_custom_MarineAdvancedRoboticsIncMember" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">11,902</ix:nonFraction></td><td style="padding-bottom: 1pt; width: 1%; text-align: left">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td>&#160;</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td style="text-align: right">&#160;</td><td style="text-align: left">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td>Cash</td><td>&#160;</td>
    <td style="text-align: left">$</td><td id="xdx_981_eus-gaap--BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_iI_pn3n3_c20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvanceRoboticsIncMember_zNyZ5jprcmU5" title="Cash" style="text-align: right"><ix:nonFraction name="us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents" contextRef="AsOf2021-11-15_custom_MarineAdvanceRoboticsIncMember" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">12</ix:nonFraction></td><td style="text-align: left">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: White">
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  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left">Property and equipment, net</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td id="xdx_983_eus-gaap--BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_iI_pn3n3_c20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvanceRoboticsIncMember_z9dooLl4Jy0l" title="Property and equipment, net" style="text-align: right"><ix:nonFraction name="us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment" contextRef="AsOf2021-11-15_custom_MarineAdvanceRoboticsIncMember" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">38</ix:nonFraction></td><td style="text-align: left">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td>Trademarks</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td id="xdx_98D_eus-gaap--BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_iI_pn3n3_c20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvanceRoboticsIncMember__us-gaap--IndefiniteLivedIntangibleAssetsByMajorClassAxis__us-gaap--TradeNamesMember_z6L0E06lAlKe" title="Intangible assets" style="text-align: right"><ix:nonFraction name="us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill" contextRef="AsOf2021-11-15_custom_MarineAdvanceRoboticsIncMember_us-gaap_TradeNamesMember" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">2,755</ix:nonFraction></td><td style="text-align: left">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td>Patents</td><td>&#160;</td>
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  <tr style="vertical-align: bottom; background-color: White">
    <td style="padding-bottom: 1pt">Goodwill</td><td style="padding-bottom: 1pt">&#160;</td>
    <td style="border-bottom: Black 1pt solid; text-align: left">&#160;</td><td id="xdx_985_eus-gaap--Goodwill_iI_pn3n3_c20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvanceRoboticsIncMember_zuYmZv3w8ON5" title="Goodwill" style="border-bottom: Black 1pt solid; text-align: right"><ix:nonFraction name="us-gaap:Goodwill" contextRef="AsOf2021-11-15_custom_MarineAdvanceRoboticsIncMember" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">7,754</ix:nonFraction></td><td style="padding-bottom: 1pt; text-align: left">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="padding-bottom: 2.5pt; text-align: left">Net assets acquired</td><td style="padding-bottom: 2.5pt">&#160;</td>
    <td style="border-bottom: Black 2.5pt double; text-align: left">$</td><td id="xdx_989_eus-gaap--BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_iI_pn3n3_c20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvanceRoboticsIncMember_zxM5Z3nCk0C2" title="Net assets acquired" style="border-bottom: Black 2.5pt double; text-align: right"><ix:nonFraction name="us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet" contextRef="AsOf2021-11-15_custom_MarineAdvanceRoboticsIncMember" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">11,902</ix:nonFraction></td><td style="padding-bottom: 2.5pt; text-align: left">&#160;</td></tr>
  </table>

</ix:nonNumeric><p id="xdx_8A1_zsZjQPc9fb32" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; background-color: white"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
net assets were recorded at their estimated fair value. In valuing acquired assets and liabilities, fair value estimates were based
primarily on future expected cash flows, market rate assumptions, and appropriate discount rates. In connection with the acquisition
of MAR, we acquired approximately $<span id="xdx_909_eus-gaap--BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_iI_pn5n6_c20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvancedRoboticsIncMember_z4yYiI9qOch2" title="Business acquistion intangible assets"><ix:nonFraction name="us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill" contextRef="AsOf2021-11-15_custom_MarineAdvancedRoboticsIncMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">3.9</ix:nonFraction></span>
million of intangible assets including trademarks with an indefinite life and patents that will be amortized over a useful life of
nine years. </span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; background-color: white"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; background-color: white"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Goodwill
is considered an indefinite-lived asset that relates primarily to intangible assets that do not qualify for separate recognition.
The Company is currently evaluating the tax implications on the business combination accounting and compiling the information needed
for a pro forma disclosure related to the acquisition of MAR which is expected in our year end reporting.</span></p>





<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"></span></p>

</ix:nonNumeric><ix:nonNumeric contextRef="From2021-05-01to2022-01-31" escape="true" name="us-gaap:SubsequentEventsTextBlock"><p id="xdx_801_eus-gaap--SubsequentEventsTextBlock_z6CGb3ZWw7o3" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(19)
</b></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><span id="xdx_82C_zS9gnG1AjLzk">Subsequent
Events</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b></b></span>&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"></p>

<p style="font: 10pt/120% Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="background-color: white"><i>New
Jersey Net Operating Loss Transfer Program</i></span></p>
<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>&#160;</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt; background-color: white"></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt; background-color: white">In
February 2022, the Company sold New Jersey State net operating losses and research and development credits in
the amount of $<span id="xdx_901_eus-gaap--OperatingLossCarryforwards_iI_pn5n6_c20220228__us-gaap--SubsequentEventTypeAxis__us-gaap--SubsequentEventMember__us-gaap--IncomeTaxAuthorityNameAxis__us-gaap--NewJerseyDivisionOfTaxationMember_zJNsorBXYVk6"><ix:nonFraction name="us-gaap:OperatingLossCarryforwards" contextRef="AsOf2022-02-28_us-gaap_SubsequentEventMember_us-gaap_NewJerseyDivisionOfTaxationMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">4.0</ix:nonFraction>
</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt; background-color: white">million, resulting in
the recognition of income tax benefits of $<span id="xdx_907_eus-gaap--IncomeTaxExpenseBenefit_pn5n6_c20220201__20220228__us-gaap--SubsequentEventTypeAxis__us-gaap--SubsequentEventMember__us-gaap--IncomeTaxAuthorityNameAxis__us-gaap--NewJerseyDivisionOfTaxationMember_z10BxP1kMu99"><ix:nonFraction name="us-gaap:IncomeTaxExpenseBenefit" contextRef="From2022-02-012022-02-28_us-gaap_SubsequentEventMember_us-gaap_NewJerseyDivisionOfTaxationMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">0.4</ix:nonFraction>
</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt; background-color: white">million.</span></p>

</ix:nonNumeric><p id="xdx_81F_zLJMZI214FO7" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"></p>

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    <!-- Field: /Page -->

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; text-align: justify; margin-top: 0pt; margin-bottom: 0pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><span id="ds_009"></span>Item
2. MANAGEMENT&#8217;S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS</b></span></p>



<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>&#160;</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
following discussion and analysis should be read in conjunction with the accompanying unaudited consolidated financial statements and
related notes included in this Quarterly Report on Form 10-Q. Some of the information contained in this management&#8217;s discussion
and analysis is set forth elsewhere in this Form 10-Q, including information with respect to our plans and strategy for our business,
pending and threatened litigation and our liquidity, includes forward-looking statements that involve risks and uncertainties. You should
review the &#8220;Risk Factors&#8221; section of our Annual Report on Form 10-K for the year ended April 30, 2021 for a discussion of
important factors that could cause actual results to differ materially from the results described in or implied by the forward-looking
statements contained in the following discussion and analysis. References to a fiscal year in this Form 10-Q refer to the year ended
April 30 of that year (e.g., fiscal 2021 refers to the year ended April 30, 2021).</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Overview
and mission</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">We
were incorporated under the laws of the State of New Jersey in April 1984 and began commercial operations in 1994. On April 23, 2007,
we reincorporated in Delaware.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">We
are an ocean data, marine power, and consulting services provider. We control the design, manufacture, sales, installation, operations
and maintenance of our solutions and services while working closely with commercial, technical, and other development partners that provide
software, controls, mechatronics, sensors, integration services, and marine installation services. We believe our renewable autonomous
ocean solutions enable technologies for data collection, analysis, communication in remote ocean environments, as well as generate actionable intelligence and control certain equipment linked to edge and cloud environments.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Our
mission and purpose are to provide intelligent maritime solutions and services that enable more secure and more productive utilization
of our oceans and waterways, green energy power services, and sophisticated surface and sub-surface marine domain awareness solutions.
We achieve this through our proprietary, state-of-the-art technologies that are at the core of our clean and renewable energy platforms
upon which we offer our solutions and services as well as through working with select partners.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Strategy
and marketing</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Our
strategy includes developing complete solutions and services, including cloud-based delivery systems for ocean data and predictive analytics
to provide actionable intelligence for our clients. We believe that having demonstrated the capability of our solutions, we can advance
our product and services and gain further adoption from our target markets. Our marketing efforts are focused on offshore locations that
require a cost-efficient solution for renewable, reliable, and persistent power and communications, either by supplying electric power
to payloads that are integrated directly with our product or located in its vicinity, such as on the seabed and in the water column.
Our recent projects have been in the offshore energy and science and research industries.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Based
on our market research and publicly available data, including but not limited to the U.S. Department of Energy (&#8220;DOE&#8221;) 2019
Powering the Blue Economy Report, the Westwood Energy World ROV Operations Forecast 2019-2023, and the World Bank Database, we believe
there is an increasing need for our products and services in maritime domain awareness applications and numerous markets may have a direct
need for our solutions. Potential customers include, but are not limited to, defense and security, offshore energy, science and research,
and offshore wind markets, as well as government applications in fishery protection and marine protected areas.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Our
Solutions</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Our
solutions focus on three major services areas, Data as a Service, supported and enabled by Power as a Service, and underpinned by our
Strategic Consulting Services.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>&#160;</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i><span style="text-decoration: underline">Data
as a Service</span></i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Our
Data as a Service solution concept was originally based on the work we performed for Harbour Energy (formerly known as Premier Oil) in
the North Sea. With the support of our key software and mechatronics partners, and based on feedback from participants in the government,
defense, and security markets, we have evolved this concept into our commercial development programs. These include our custom software
development efforts to further extend our edge computing and cloud hosting capabilities solution with the ability to support artificial
intelligence modules that can be delivered to customers via secure cloud environments. The initial release of our new solution will be
deployed onto a multi-buoy array off the coast of New Jersey, creating a floating test bed for current capabilities and future developments.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>&#160;</i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"></p>

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    <!-- Field: /Page -->

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>&#160;</i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>Maritime
Domain Awareness Solution (&#8220;MDAS&#8221;)</i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
International Maritime Organization defines Maritime Domain Awareness (&#8220;MDA&#8221;) as the effective understanding of any activity
that could impact upon the security, safety, economy, or environment. Since 2002, the United States of America, for example, has had
an active strategy to secure the Maritime Domain. Furthermore, in 2020 the U.S. Coast Guard elevated Illegal, Unreported and Unregulated
(&#8220;IUU&#8221;) fisheries, one aspect of MDA security, as the leading global maritime threat.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>&#160;</i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">We
have designed a solution to provide detailed, localized maritime domain awareness that can be utilized for a wide range of applications
across market segments. Our MDAS base configuration consists of a high-definition radar, stabilized high-definition optical and thermal
imaging camera, vessel automatic identification system (&#8220;AIS&#8221;) detection, and integrated command and control software that
can be installed on a range of platforms, including our buoys and autonomous vehicles. Additional sensors can be added as customer
needs dictate. Capabilities include 24/7 vessel tracking, automatic radar plotting, automated vessel warnings, and high-definition optical
and thermal video surveillance capable of providing actionable intelligence promptly.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">We
anticipate that data from our MDAS will be processed onboard our buoys using edge computing, transmitted to our cloud-based analytics
platform via secure Wi-Fi, cellular, and/or satellite systems. Surveillance data can be integrated with readily available marine monitoring
software or with our own MDA software solution developed together with leading partners in the technology industry to provide command
and control features of a multi-buoy surveillance network. The data can also be integrated with satellite, weather, bathymetric, and
other third party data feeds to form a detailed surface and subsea picture of a monitored area.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
development of our MDAS is underway, and we launched the first offshore system supporting the demonstration of the newly developed system
with our hardware and TimeZero software in October 2021. To date we have collected more than 2,000 radar and AIS tracks from our previous
New Jersey deployments. This data is being used to refine the design of our MDAS. We are working on the deployment of additional systems
to test the next generation of solutions during fiscal calendar Q4 2022.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">In
October 2020, the Company entered into an agreement with Adams Communication &amp; Engineering Technology, Inc. (&#8220;ACET&#8221;)
to conduct a feasibility study for the evaluation of a PB3 power and 5G communications solution in support of the U.S. Navy&#8217;s Naval
Postgraduate School&#8217;s Sea, Land, Air, Military Research Initiative (&#8220;SLAMR&#8221;). This forms part of our Data as a Service
division.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>Autonomous
Vehicles (&#8220;WAM-V&#8221;)</i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>&#160;</i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">On
November 15, 2021, the Company acquired all of the outstanding equity interest of MAR. Founded in 2004, MAR is the developer of the patented
Wave Adaptive Modular Vessel (WAM-V&#174;) technology, which enables roaming capabilities for uncrewed maritime systems in waters around
the world. MAR launched the first WAM-V in 2007 as a new vessel class with a mission to manufacture and deliver to customers the most
reliable and robust autonomous surface vehicles available on the market. MAR also provides RaaS (Robotics as a Service) allowing
customers to leverage WAM-V technology and MAR expertise on a per project basis. Today, WAM-Vs operate in 11 countries for commercial,
military and scientific customers.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>&#160;</i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">This
acquisition immediately provided the Company with an established, innovative inshore, nearshore and offshore product line that highly
complements the Company&#8217;s business strategy. Since the acquisition, MAR has continued to grow and is further expanding into its
core marine survey and maritime security markets in Europe, Asia, Oceania and the Americas. As we continue to bring MAR and the WAM-V
technology into the OPT family, we expect to expand on the synergistic opportunities we have identified. For example, we plan to integrate
the MDAS platform onto the WAM-V to expand our MDA offering to provide a roaming MDA solution to our customers.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i><span style="text-decoration: underline">Power
as a Service</span></i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Power
as a Service solutions deliver value to customers by utilizing our managed power platforms. We continue to develop and commercialize
our proprietary power platforms that generate electricity by harnessing the renewable energy of ocean waves for our PowerBuoy&#174; (&#8220;PB3&#8221;),
and solar power for our hybrid PowerBuoy&#174; (the &#8220;hPB&#8221;) as well as subsea battery for topside and subsea power applications.
The PB3 uses proprietary technologies that convert the kinetic energy created by the motion of ocean waves into electricity. Our focus
for these solutions is on bringing autonomous clean power to our customers wherever it is required.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"></p>

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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">In
November 2020, the Company entered into an agreement to provide engineering and technical services to the DeepStar Global Technology
Consortium Program showcasing our Power as a Service. This project was completed in July 2021, and we have used the findings of the study
to advance marketing activities for our Power as a Service solution.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">On
our project with Eni S.p.A. (&#8220;Eni&#8221;), we utilized a PB3, which operated in the Adriatic Sea for over 700 days of continuous
operation as part of Eni&#8217;s resident autonomous underwater vehicle (&#8220;AUV&#8221;) feasibility studies. During commercial operations,
an AUV would remain on site to perform various inspection, maintenance, and repair tasks. As demonstrated during our project with Eni,
our solutions generated sufficient power that could, with client assets, extend missions for longer durations.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">In
June 2021, the Company was notified of a pre-award for a Department of Energy (&#8220;DOE&#8221;) Small Business Innovation Research
program (&#8220;SBIR&#8221;) to support the development of the next generation of our wave energy conversion systems. In August 2021,
we completed all required documentation and signed the DOE contract. The 9-month project began in the second quarter of
fiscal 2022.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>PB3
PowerBuoy</i><sup>&#174;</sup></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
PB3 generates electricity by harnessing the renewable energy of ocean waves. The PB3 features a unique onboard power take-off (&#8220;PTO&#8221;)
system, which incorporates both energy storage and energy management and control systems. The PB3 generates a nominal name-plated capacity
rating of up to 3 kilowatts (&#8220;kW&#8221;) of peak power during recharging of the onboard batteries. Power generation is deployment-site
dependent. Our standard energy storage system (&#8220;ESS&#8221;) has an energy capacity of up to a nominal 150 kW-hours to meet specific
application requirements.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
PB3 is designed to generate power for use independent of the power grid in remote offshore locations. The hull consists of a main spar
structure loosely moored to the seabed and surrounded by a floating annular structure that can freely move up and down in response to
the passage of the waves. The PTO system includes a mechanical actuating system, an electrical generator, a power electronics system,
our control system, and our ESS which is sealed within the hull. As ocean waves pass the PB3, the mechanical stroke action created by
the rising and falling of the waves is converted into rotational mechanical energy by the PTO, which in turn, drives the electric generator.
The power electronics system then conditions the electrical output which is collected within an ESS.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
operation of the PB3 is controlled by our customized, proprietary control system. The control system uses sensors and an onboard computer
to continuously monitor the PB3 subsystems. We believe that this ability to optimize and manage the electric power output of the PB3
is a significant advantage of our technology. In the event of large storm waves, the control system automatically locks the PB3, and
electricity generation is suspended. However, the load center (either the on-board payload or one in the vicinity of the PB3) may continue
to receive power from the ESS. When wave heights return to normal operating conditions, the control system automatically unlocks the
PB3 and electricity generation and ESS replenishment recommences. This safety feature helps to prevent the PB3 from being damaged by
storms.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
PB3 can be transported over land to the deployment port using conventional transportation methods. Once at port, the PB3 can be lifted
into the water or onboard a vessel using a readily available crane of appropriate capacity. The PB3 may then be towed to a site using
a standard vessel (if the location is within an appropriate distance from the port), or the PB3 may be carried aboard a vessel to its
offshore location and craned into the water at site. The PB3 is then attached to the mooring system, which is installed during a separate
operation, after which a brief commissioning process places the PB3 into operation.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">A
single MDAS equipped PB3 can monitor vessel traffic, with or without AIS turned on, across an area approximately 1,300 square kilometers
of ocean territory, with the ability to link multiple surveillance assets together over large ocean areas giving end-users visibility
into potentially damaging environmental or illegal activities. Customized solutions are also available including the addition of subsea
sensors to monitor for acoustic signatures, including tsunami, and water quality.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"></p>

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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>hybrid
PowerBuoy&#174;</i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company is currently optimizing the design of our original hPB. The hPB is capable of utilizing solar and wind power,
in addition to wave energy. Based on prototype testing, we are optimizing the solar and wind generation, as well as increasing the battery
energy storage capacity. The hPB is capable of providing reliable power in remote offshore locations, regardless of ocean wave conditions.
We believe this product is complementary to the PB3 by providing the Company the opportunity to address a broader spectrum of customer
deployment needs, including low-wave environments, with the potential for greater product integration within each customer project. The
hPB is intended to provide a stable energy platform for our MDAS solution, and for agile deployment of subsea power applications, such
as recharging and surface communications hub for electric remotely operated vehicles (&#8220;eROV&#8221;) such as our WAM-V and AUV used
for underwater inspections and short-term maintenance, subsea equipment monitoring and control. The design has a high payload capacity
for surveillance and communications equipment, with the capability of being tethered to subsea payloads such as batteries, or with a
conventional anchor mooring system. Energy is stored in onboard batteries which power subsea and topside payloads. The hPB is designed
to be able to operate over a broad range of temperature and ocean wave conditions.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">As
with the PB3, the control system uses sensors and an onboard computer to continuously monitor the hPB subsystems. The load is powered
by the onboard Lithium Ion batteries, so that payloads are powered no matter what the weather or sun conditions.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
hPB can be transported over land to the deployment port using conventional transportation methods. Once at port, it can be lifted into
the water or onboard a vessel using a readily available crane of appropriate capacity. The hPB may then be towed to a site using a standard
vessel, or the hPB may be carried aboard a vessel to its offshore location and craned into the water at site.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>Subsea
Battery</i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">We
have product launched a subsea battery that is complementary to both the PB3 and hPB products and can be deployed together with our PowerBuoys&#174;
or on its own. It offers customers the option of placing additional modular and expandable energy storage on the seabed near existing,
or to be installed, subsea equipment. Our pressure tested lithium-ion subsea batteries supply power that can enable subsea equipment,
sensors, communications and AUV and eROV recharge. Our PB3 and hPB are complimentary to the subsea batteries by providing a means for
recharging during longer term deployments, or the batteries can be used independently for shorter term deployments.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
subsea battery has been designed to provide continuous and/or short-term power supply from its integrated energy storage system, enabling
us to supply into a range of industries and applications, from backup power to critical subsea infrastructure to continuous operation
of subsea equipment, such as electric valves. The base design of the subsea battery has a nominal 100kW-hours of energy storage. The
subsea battery can be transported over land to the deployment port using conventional transportation methods. Once at port, the subsea
battery can be lifted onboard a vessel using a readily available crane of appropriate capacity. The battery can then be carried aboard
a vessel to its offshore location and craned into the water at site. It comes installed on a ready deployable subsea skid suitable for
installation on the seabed. The subsea battery can be integrated into other subsea equipment on land prior to deployment.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i><span style="text-decoration: underline">Strategic
Consulting Services</span></i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>&#160;</i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Our
Strategic Consulting Services were materially expanded with the acquisition of 3dent Technology, LLC (&#8220;3Dent&#8221;), in February
2021. As part of our continued strategic operations, we intend to continue to grow our service sectors and develop, evolve, and strengthen
our solutions through internal developments, partnerships, and potential acquisitions. Our team of dedicated consultants/designers has
expertise in structural engineering, hydrodynamics and naval architecture. Among its services is a focus on addressing the issues current
or would-be offshore drill rig owners, including owners of floaters, jackups, and lift boats. Consulting services include simulation
engineering, software engineering, concept design and motion analysis. During the third quarter of fiscal 2022, the Company saw an increase
in consulting services activity for conventional offshore energy and offshore wind projects.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"></p>

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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
focus of our Strategic Consulting Services is on delivering value to our customers in the areas of ocean engineering, structural and
dynamic analysis, Front End Engineering and Design (&#8220;FEED&#8221;) studies, and motion simulation. These services can be integrated
well into our broader Power and/or Data as a Service solutions, utilizing our solutions or on a standalone basis. In the near term, we
will focus on increasing our market share in the offshore wind market and the broader floating foundation design market, as well as our
business with offshore energy customers.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">In
addition to work performed by the Company for the DeepStar project, through our Strategic Consulting Services group, we also offer a
full range of high-level offshore engineering, including providing consulting engineering and design services to offshore wind developers,
offshore construction companies, drilling contractors, major oil companies, service companies, shipyards, and engineering firms.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Business
Update Regarding COVID-19 and its variants</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
COVID-19 pandemic presented substantial health and economic risks, uncertainties and challenges to our business, the global economy and
financial markets. In March 2020, one of the Company&#8217;s customers cancelled a portion of their contract due to the outbreak of COVID-19
and instead extended an existing lease. In April 2020, the Company declared force majeure on a contract with a different customer and
delayed the deployment of its PB3 PowerBouy&#174; in Chile. For additional information on various uncertainties and risks posed by the
COVID-19 pandemic, see Part I, Item 1A &#8220;Risk Factors&#8221; of our Annual Report on Form 10-K for the year ended April 30, 2021.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">On
March 27, 2020, the U.S. Government passed into law the Coronavirus Aid, Relief and Economic Security Act, or the (&#8220;CARES Act&#8221;).
On May 3, 2020, the Company signed a Paycheck Protection Program (&#8220;PPP&#8221;) loan with Santander as the lender for approximately
$890,000. The PPP loan was unsecured and evidenced by a note in favor of Santander as the lender and governed by a Loan Agreement with
Santander. The Company received the proceeds on May 5, 2020.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company filed its loan forgiveness application at the end of February 2021 asking for 100% forgiveness of the loan. In June 2021, the
Company was informed that its application was approved, and that the loan is now fully forgiven. The Company recognized a gain on extinguishment
of PPP loan of approximately $890,000 in the Consolidated Statement of Operations for the nine months ending January 31, 2022.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">During
2020 we started to experience some delays related to the impact of COVID-19 on the international supply chain. We were able to mitigate
much of the impact by consuming not only internal inventory but also by expanding our supply base. We have a global supply chain, and
in addition to domestic sources, we obtain components from Asia and Europe. We use a combination of off-the-shelf components and equipment
(COTS) as well as custom developed parts. There have been a number of disruptions throughout the global supply chain which have impacted
our development and manufacturing. As the global economy continues to open up, it is driving the demand for certain components. This
has outpaced the return of the global supply chain to full production. Although we have been able to find alternatives for many component
shortages, we experienced, and continue to experience, some delays and cost increases with respect to container shortages, ocean shipping
and air freight. In addition, our key suppliers have experienced longer lead times and cost increases for raw materials and have
experienced periods of interruption to production due to COVID-19 and its variants affecting manpower. Though local manpower and similar
Covid-related problems are starting to ease, we continue to have concerns over component shortages, particularly for semiconductors and
specialty metals which we foresee to continue at least through the first half of calendar 2022.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">If
spikes in COVID-19 and its variants occur in regions in which our supply chain operates, we could experience periodic interruptions or
impacts due to delays in components and incur further freight price increases. We continue to monitor and adjust our operations, as appropriate.
in response to the COVID-19 pandemic.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"></p>

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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Commercial
Activities</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">We
continue to seek new strategic relationships and further develop our existing partnerships. We collaborate with companies that have developed
or are developing in-ocean applications requiring a persistent source of power that is also capable of real time data collection, processing
and communication, to address potential customer needs. The table below shows the percentage of the Company&#8217;s revenues derived
from customers whose revenues accounted for at least 10% of the Company&#8217;s consolidated revenues for at least one of the periods
indicated:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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    months ended January 31,</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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    months ended January 31,</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 11%; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">11</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">%</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Department
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    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">EGP</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">16</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">%</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">63</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">%</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">ACET</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">0</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">%</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Valaris
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  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Nippon
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    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">0</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">%</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
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    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">0</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">%</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Other
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    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">26</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">%</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">9</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">%</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">100</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">%</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">100</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">%</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">100</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">%</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">100</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">%</span></td></tr>
  </table>


<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<table cellspacing="0" cellpadding="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: #CCEEFF">
    <td style="font: 10pt Times New Roman, Times, Serif; padding-right: 2.65pt; text-align: right; width: 40%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(1)</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; padding-right: 0.75pt; padding-left: 2.65pt; width: 60%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">3Dent
    related consulting</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif; background-color: white; padding-right: 2.65pt; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(2)</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; padding-right: 0.75pt; padding-left: 2.65pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">MAR
    related sales</span></td></tr>
  </table>
<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">In
order to achieve success in commercializing our products, we must expand our customer base and obtain commercial contracts to lease or
sell our solutions and services to customers. Our potential customer base for our <span style="color: #333333">solutions</span> includes
various public and private entities, and agencies that require remote offshore power. To date, substantially all of our revenue producing
contracts have been with a small number of customers under contracts to fund a portion of the costs of our operational efforts to develop
and improve our technology, validate our product through ocean and laboratory testing, and business development activities with potential
commercial customers. Our goal in the future is that an increased portion of our revenues will be from the lease or sale of our products
and related maintenance as well as consultative and other services.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Curren<span style="background-color: white">t
and Recent Customers</span></i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 0"><tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
<td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in"></td><td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt; background-color: white"><i>&#9679;</i></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt; background-color: white">MAR
                                            has contracted to build WAM-Vs for Brigham Young</span> <span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">University,
                                            Nippon Kaiyo, and the Naval Surface Warfare Center.</span></td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-align: justify; text-indent: -0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>&#160;</i></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 0"><tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
<td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in"></td><td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">In
                                            June 2021, the Company was notified of a pre-award for a Department of Energy (&#8220;DOE&#8221;)
                                            Small Business Innovation Research program (&#8220;SBIR&#8221;) to support the development
                                            of the next generation of our wave energy conversion systems. In August 2021, we completed
                                            all required documentation, signed the DOE contract and initiated the 9-month project which
                                            began in the second quarter of fiscal 2022.</span></td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-align: justify; text-indent: -0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 0"><tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
<td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in"></td><td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Throughout
                                            the first nine months of fiscal 2022, our Strategic Consulting Services, continued to generate
                                            revenues from both prior and new customers of approximately $424,000. Notably, we advanced
                                            several large projects in the pipeline to an advanced stage with larger oil and gas operators
                                            and offshore wind developers.</span></td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-align: justify; text-indent: -0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 0"><tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
<td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in"></td><td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt; background-color: white">&#9679;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt; background-color: white">In
                                            November 2020, the Company entered into an agreement with the OOC to provide engineering
                                            and technical services for a new project under the DeepStar Global Technology Consortium
                                            Program. This project showcased our Power as a Service solution among well-known operators
                                            in the industry. This project was completed in July 2021. </span></td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-align: justify; text-indent: -0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-align: justify; text-indent: -0.25in"></p>

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    <div style="break-before: page; margin-top: 6pt"><table cellpadding="0" cellspacing="0" style="border-collapse: collapse; width: 100%; font-size: 10pt"><tr style="vertical-align: top; text-align: left"><td style="width: 100%"><a href="#toc_001">Table of Contents</a></td></tr></table></div>
    <!-- Field: /Page -->

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-align: justify; text-indent: -0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 0"><tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
<td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in"></td><td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt; background-color: white">&#9679;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt; background-color: white">In
                                            October 2020, the Company entered into an agreement with ACET to conduct a feasibility study
                                            for the evaluation of a PB3 power and 5G communications solution in support of the U.S. Navy
                                            Naval Postgraduate School&#8217;s SLAMR initiative. The study was completed, and the Company
                                            is currently in active discussions with the SLAMR Consortium on the project&#8217;s next
                                            steps on providing the data and power solution. The SLAMR initiative is ongoing and on October
                                            29, 2021, the SLAMR Consortium released additional information about the project into the
                                            market.</span></td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-align: justify; text-indent: -0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 0"><tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
<td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in"></td><td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">In
                                            March 2020, Eni exercised their option from the March 2018 contract to extend their lease
                                            of the PB3 for an additional 18 months. The initial provision in March 2018 agreement provided
                                            for a minimum 24-month contract that included an 18-month PB3 lease and associated project
                                            management. In November 2020, Eni retrieved the PB3 and returned it to shore due to a mooring
                                            issue. The PB3 has since been returned to our headquarters in New Jersey and has completed
                                            its refurbishment and is being readied to deploy as part of our MDAS demonstration off the
                                            coast of New Jersey.</span></td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-align: justify; text-indent: -0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 0"><tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
<td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in"></td><td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">In
                                            September 2019, we entered into two contracts with subsidiaries of EGP, which included the
                                            sale of a PB3 and the development and supply of a turn-key integrated Open Sea Lab (&#8220;OSL&#8221;)
                                            that was expected to be the Company&#8217;s first deployment off the coast of Chile. Due
                                            to the COVID-19 pandemic, force majeure was declared in April 2020 and delayed the deployment.
                                            In March 2021, the Company began the deployment process and placed the PB3 in the water.
                                            During the first nine months of fiscal 2022, deployment installation activities were performed,
                                            and additional activities are expected to be performed over the next fiscal quarter.</span></td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-align: justify; text-indent: -0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 0"><tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
<td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in"></td><td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">In
                                            June 2018, we entered into a contract with Harbour Energy for the lease of a PB3 to be deployed
                                            in one of Harbour Energy&#8217;s offshore fields in the North Sea. During its deployment,
                                            the PB3 provided unmanned EZM service. In early March 2020 the Company and Harbour Energy
                                            retrieved the PB3. This PB3 has since been returned to our headquarters in New Jersey and
                                            is currently being refurbished to be redeployed. During the second quarter of fiscal 2022
                                            we entered into a contract with Aker Solutions to support a study integrating the PB3 system
                                            for the next phase of Harbour Energy&#8217;s development plans.</span></td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-align: justify; text-indent: -0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Partnerships</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">We
believe that our solutions are best developed, sold, deployed, and maintained together with subject matter experts in their respective
fields. This enables the Company to protect, maintain, and evolve our power platforms and integrate them with surface and subsea payloads.
The Company has previously entered into partnerships focused on including, but not limited to, deployment and installations, sourcing
of surface payloads, and integration with autonomous vehicles. To further develop the MDAS, we recently entered into strategic software
and robotics partnerships with two software companies, Greensea Systems, Inc. and Fathom5. We believe the partnerships with Greensea
and Fathom5 will further the development of our next-generation MDAS product for the maritime industrial market and governmental defense
and security organizations.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>&#160;</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Greensea
Systems, Inc. is contributing to the Company&#8217;s MDAS by providing integration software, control software, autonomy and systems integration
for the buoy sensor payload.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Fathom5
is designing and building a customized industrial analytics platform to support the Company&#8217;s MDAS. The Fathom5 customized platform
will integrate sensor technologies, combine data feeds, and provide a flexible plug-in analytic capability to apply artificial intelligence
and machine learning to sensor feeds. Fathom5 is also building the user interface that will allow remote operators to control the MDAS
payload and view sensor data in real time.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">We
also maintain active dialogues with several offshore deployment and marine operations partners in the North Sea and North America to
support our projects.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"></p>

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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Business
Strategy</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">During
fiscal 2021 and the first nine months of fiscal 2022, we advanced our marketing programs, products, and solutions. We have made progress
in transitioning from R&amp;D to commercialization and moving further into the ocean data as a service market. We intend to build on
these efforts by implementing processes and solutions that cover the entire life cycle, from demand generation to close of contract,
and from channel strategies to customer care. This strategy was further enhanced by our acquisition of MAR in November 2021.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>&#160;</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Most
of the Company&#8217;s opportunities with potential customers have been for projects in Western Europe, including the North Sea, as well
as North and South America, and South East Asia. Nearly two-thirds of these opportunities have progressed past initial feasibility and
non-disclosure agreement stages to more detailed, confidential discussions around specific customer applications. Many proposal requests
are for projects where one of our PowerBuoy&#174; products, either the PB3, the hPB, or our subsea battery is part of a larger solution
deployment, and typically include the potential lease or sale of one or more of our solutions deployed on our PowerBuoy&#174; platforms,
as well as required services and maintenance support.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Historically,
demonstration projects have been a necessary step toward broad solution deployment and revenues associated with specific applications
like our New Jersey MDAS test array as part of our Data as a Service offering. A proposal phase typically lasts from three months to
more than one year. During the demonstration project specification, negotiation and evaluation period, we are often subject to the prospective
customer&#8217;s vendor qualification process, which entails substantial due diligence of the Company and capabilities and may include
negotiation of standard terms and conditions. Many proposals contain provisions which would mandate the sale or lease of our PowerBuoy&#174;
product upon successful conclusion of the demonstration project.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company is pursuing a long-term growth strategy to expand its market value proposition while building the Company&#8217;s revenue base.
This strategy includes partnerships with leading companies in adjacent and complementary markets. We continue to commercialize our PowerBuoy&#174;
products for use in remote offshore power and real-time data communications applications, and in order to achieve this goal, we are pursuing
the following business objectives:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 0"><tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
<td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in"></td><td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Integrated
                                            turn-key solutions, sales or leases.</i> We believe our Data and Power as a Service offerings,
                                            together with our platforms, are well suited to enable many uncrewed, autonomous (non-grid
                                            connected) offshore solutions, such as topside and subsea surveillance and communications,
                                            subsea equipment monitoring, early warning systems platform and subsea power and buffering,
                                            and weather and climate data collection. We have investigated and realized market demand
                                            for some of these solutions and we intend to sell and lease our products to these markets
                                            as part of these broader integrated solutions. Additionally, we intend to provide services
                                            associated with our solution offerings such as paid engineering studies, value-added engineering,
                                            maintenance, remote monitoring and diagnostic, application engineering, planning, training,
                                            project management, and marine and logistics support required for our solution life cycle.
                                            We continue to increase our commercial capabilities through new hires in sales and application
                                            support, and through engagement of expert market consultants in various geographies. As our
                                            MDAS grows, we expect that this will also include data and cloud services.</span></td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-align: justify; text-indent: -0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 0"><tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
<td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in"></td><td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Expand
                                            customer system solution offerings through new complimentary products that enable shorter
                                            and more cost-efficient deployments.</i> We are continuously improving our technology solutions.
                                            The hPB is highly complementary to the PB3 by providing the Company the opportunity to address
                                            a broader spectrum of customer deployment needs, including low-wave environments, with the
                                            potential for greater system integration within each customer project. The hPB is intended
                                            for deployments for which the PB3 is not suitable, including shorter term missions and very
                                            low wave environments. It supports deployment applications such as maritime domain awareness
                                            and communications, eROV and AUV inspections and subsea equipment and controls.</span></td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-align: justify; text-indent: -0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-align: justify; text-indent: -0.25in"></p>

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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-align: justify; text-indent: -0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company has developed a subsea battery system that is complimentary to the Company&#8217;s PowerBuoy&#174; products. The subsea battery
system offers the possibility of creating a sea floor energy storage solution for remote offshore operations. These subsea battery systems
contain lithium-ion batteries, which provide high power density to supply power to subsea equipment, sensors, communications, and the
recharging of AUVs and eROVs.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Ideal
for many remote offshore customer applications, these subsea battery systems are anticipated to be safe, high performance, cost-efficient,
and quickly deployable.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 0"><tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
<td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in"></td><td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Focus
                                            sales and marketing efforts in global markets.</i> While we are marketing our products and
                                            services globally, we have focused on several key markets and applications, including US
                                            and foreign defense and security applications with our MDAS offering; subsea power for oil
                                            and gas; and the hydrographic survey market in US, Europe and Australia with the WAM-V&#8217;s.
                                            We believe that each of these areas has demand for our solutions, sizable end market opportunities,
                                            political and economic stability, and high levels of industrialization and economic development.
                                            In fiscal 2021, we opened an office in Houston, Texas to further support our customers and
                                            strengthen our dialogue with our solution partners. During fiscal 2022, we further solidified
                                            our European footprint, concentrating on our North Sea resource. We are in active discussions
                                            with potential partners in North and South America, Southeast Asia and West Africa.</span></td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-align: justify; text-indent: -0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 0"><tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
<td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in"></td><td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Expand
                                            our relationships in key market areas through strategic partnerships and collaborations.
                                            </i>We believe that strategic partners are an important part of commercializing new products.
                                            Partnerships and collaborations can be used to improve the development of overall integrated
                                            solutions, create new market channels, expand commercial know-how and geographic footprint,
                                            and bolster our product delivery capabilities. We have formed such a relationship with several
                                            well-known groups, and we continue to seek other opportunities to collaborate with application
                                            experts from within our selected markets. These partnerships have helped us source services,
                                            such as installation expertise, and products, such as MDA enabling equipment, to meet our
                                            development and customer obligations. Since our acquisition of 3Dent and MAR, we have been
                                            actively pursuing additional opportunities to bring in-house skills, capabilities, and solutions
                                            that are complementary to our strategy and enable us to scale more quickly.</span></td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-align: justify; text-indent: -0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 0"><tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
<td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in"></td><td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Partnering
                                            with fabrication, deployment and service support</i>. In order to minimize our capital requirements
                                            as we scale our business, we intend to optimize and utilize state of the art fabrication,
                                            anchoring, mooring, cabling supply, and in some cases, deployment of our products and solutions.
                                            Our PTO is a proprietary subsystem that is assembled and tested at our facility. We believe
                                            this distributed manufacturing and assembly approach enables us to focus on our core competencies
                                            and ensure a cost-effective product by leveraging a larger more established supply base.
                                            We continue to seek strategic partnerships regarding servicing of our products and solutions.</span></td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-align: justify; text-indent: -0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 0"><tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
<td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in"></td><td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt; background-color: white">&#9679;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt; background-color: white"><i>Survey
                                            and security market applications. </i>With the addition of the WAM-V, we are able to increase
                                            our ability to lease vehicles specifically to support the survey markets as well as security
                                            applications while integrating MDA into these solutions. </span></td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-align: justify; text-indent: -0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>


<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Liquidity</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">During
the first nine months ending January 31, 2022, the Company incurred a net loss of approximately $13.7 million and used cash in operating
activities of approximately $15.3 million. The Company has continued to make investments in ongoing product development efforts
in anticipation of future growth. The Company&#8217;s future results of operations involve significant risks and uncertainties. Factors
that could affect the Company&#8217;s future operating results and cause actual results to vary materially from expectations include,
but are not limited to, performance of its products, its ability to market and commercialize its products and new products that it may
develop, technology development, scalability of technology and production, dependence on skills of key personnel, concentration of customers
and suppliers, deployment risks and integration of acquisitions, pending or threatened litigation, and the continued impact of COVID-19
and its variants on its business. The Company currently has committed sources of equity financing through its At the Market Offering
Agreement with A.G.P/Alliance Global Partners (&#8220;AGP&#8221;) and the Aspire Capital financing, but the Company cannot be sure that
additional equity and/or debt financing will be available to the Company as needed on acceptable terms, or at all. Management believes
the Company&#8217;s current cash balance of $63.8 million is sufficient to fund its planned expenditures through at least March 2023.
In addition to the acquisition of 3Dent in the prior year and MAR in November 2021, the Company is looking at further organic and inorganic
growth opportunities to advance our data and power services and solutions.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"></p>

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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Capital
Raises</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>At
the Market Offering Agreements</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">On
January 7, 2019, the Company entered into an At the Market Offering Agreement (&#8220;2019 ATM Facility&#8221;) with AGP, under which
the Company may issue and sell to or through AGP, acting as agent and/or principal, shares of the Company&#8217;s common stock having
an aggregate offering price of up to $25.0 million. From inception of the program through its termination on December 8, 2020, under
the 2019 ATM Facility, the Company sold and issued an aggregate of 17,595,472 shares of its common stock with an aggregate market value
of $23.4 million at an average price of $1.33 per share and paid AGP a sales commission of approximately $0.8 million related to those
shares. The agreement was fully utilized and terminated on December 8, 2020.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">On
November 20, 2020, the Company entered into an At the Market Offering Agreement with AGP (the &#8220;2020 ATM Facility&#8221;). On December
4, 2020 the Company filed a prospectus with the Securities and Exchange Commission whereby, the Company could issue and sell to or through
AGP, acting as agent and/or principal, shares of the Company&#8217;s common stock having an aggregate offering price of up to $50.0 million.
From inception of the 2020 ATM Facility through April 30, 2021, the Company sold and issued an aggregate of 17,179,883 shares of its
common stock with an aggregate market value of $50.0 million at an average price of $2.91 per share and paid AGP a sales commission of
approximately $1.6 million related to those shares. A prospectus supplement was filed on January 10, 2022 to allow the Company to sell
an additional $25.0 million (or an aggregate of $75.0 million) under the 2020 ATM Facility.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Equity
Line Common Stock Purchase Agreements</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">On
October 24, 2019, the Company entered into a common stock purchase agreement with Aspire Capital which provided that, subject to certain
terms, conditions and limitations, Aspire Capital was committed to purchase up to an aggregate of $10.0 million shares of the Company&#8217;s
common stock over a 30-month period. Through September 18, 2020, the Company had sold an aggregate of 6,424,205 shares of common stock
with an aggregate market value of $4.0 million at an average price of $0.63 per share pursuant to this common stock purchase agreement.
The agreement was fully utilized and terminated on September 18, 2020.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">On
September 18, 2020, the Company entered into a new common stock purchase agreement with Aspire Capital which provided that, subject to
certain terms, conditions and limitations, Aspire Capital was committed to purchase up to an aggregate of $12.5 million shares of the
Company&#8217;s common stock over a 30-month period subject to a limit of 19.99% of the outstanding common stock on the date of the agreement
if the price did not exceed a specified price in the agreement. The number of shares the Company could issue within the 19.99% limit
was 3,722,251 shares without shareholder approval. Shareholder approval was received at the Company&#8217;s annual meeting of shareholders
on December 23, 2020 for the sale of 9,864,706 additional shares of common stock which exceeds the 19.99% limit of outstanding common
stock on the date of the agreement. Through January 31, 2022, the Company had sold an aggregate of 3,722,251 shares of common stock with
an aggregate market value of $11.8 million at an average price of $3.17 per share pursuant to this common stock purchase agreement. The
Company is able to purchase an additional $0.7 million in shares under the agreement with Aspire Capital, which expires in March of 2023.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
sale of additional equity or convertible securities could result in dilution to our shareholders. If additional funds are raised through
the issuance of debt securities or preferred stock, these securities could have rights senior to those associated with our common stock
and could contain covenants that would restrict our operations. The Company has obtained equity financing through its At the Market Offering
Agreement with AGP and the Aspire Capital financing, but the Company cannot be sure that additional equity and/or debt financing will
be available to the Company as needed on acceptable terms, or at all. If we are unable to obtain required financing when needed, we may
be required to reduce the scope of our operations, including our planned product development and marketing efforts, which could materially
and adversely affect our financial condition and operating results. If we are unable to secure additional financing, we may be forced
to cease our operations.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"></p>

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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Backlog</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">As
of January 31, 2022, the Company&#8217;s backlog wa<span style="background-color: white">s $0.8 </span>million. As of April 30, 2021,
backlog was $0.2 million. Our backlog can include unfilled firm orders for our products and services from commercial or governmental
customers. If any of our contracts were to be terminated, our backlog would be reduced by the expected value of the remaining terms of
such contract.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
amount of contract backlog is not necessarily indicative of future revenue because modifications to or terminations of present contracts
and production delays can provide additional revenue or reduce anticipated revenue. A substantial portion of our revenue is recognized
using the input method used to measure completion over time of customer contracts, and changes in estimates from time to time may have
a significant effect on revenue and backlog. Our backlog is also typically subject to large variations from time to time due to the timing
of new awards.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Critical
Accounting Policies and Estimates</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">To
understand our financial statements, it is important to understand our critical accounting policies and estimates. We prepare our financial
statements in accordance with U.S. Generally Accepted Accounting Principles (&#8220;U.S. GAAP&#8221;). The preparation of financial statements
also requires us to make estimates and assumptions that affect the reported amounts of assets, liabilities, costs and expenses and related
disclosures. We base our estimates on historical experience and on various other assumptions that we believe to be reasonable under the
circumstances. Actual results could differ significantly from the estimates made by our management. To the extent that there are differences
between our estimates and actual results, our future financial statement presentation, financial condition, results of operations and
cash flows will be affected. We believe that the accounting policies are critical to understanding our historical and future performance,
as these policies relate to the more significant areas involving management&#8217;s judgments and estimates.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">For
a discussion of our critical accounting estimates, see the section entitled Item 7.- &#8220;Management&#8217;s Discussion and Analysis
of Financial Condition and Results of Operations&#8221; in our Annual Report on Form 10-K for the year ended April 30, 2021. There were
no material changes to our critical accounting estimates or accounting policies during the nine months ended January 31, 2022.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Recently
Issued Accounting Standards</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">In
June 2016, the Financial Accounting Standards Board (&#8220;FASB&#8221;) issued ASU No. 2016-13, &#8220;<i>Financial Instruments </i>-
<i>Credit Losses (Topic 326), Measurement of Credit Losses on Financial Instruments.&#8221; </i>This amendment replaces the incurred
loss impairment methodology in current GAAP with a methodology that reflects expected credit losses on instruments within its scope,
including trade receivables. This update is intended to provide financial statement users with more decision-useful information about
the expected credit losses. In November 2019, the FASB issued No. 2019-10, <i>Financial Instruments&#8212;Credit Losses (Topic 326),
Derivatives and Hedging (Topic 815), and Leases (Topic 842)</i>, which deferred the effective date of ASU 2016-13 for Smaller Reporting
Companies for fiscal years beginning after December 15, 2022, including interim periods within those fiscal years. The Company is
currently evaluating the impact of the adoption of ASU 2016-13 on its consolidated financial statements.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Financial
Operations Overview</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
following describes certain line items in our statement of operations and some of the factors that affect our operating results.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Revenues</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">A
performance obligation is the unit of account for revenue recognition. The Company assesses the goods or services promised in a contract
with a customer and identifies as a performance obligation either: a) a good or service (or a bundle of goods or services) that is distinct;
or b) a series of distinct goods or services that are substantially the same and that have the same pattern of transfer to the customer.
A contract may contain a single or multiple performance obligations. For contracts with multiple performance obligations, the Company
allocates the contracted transaction price to each performance obligation based upon the relative standalone selling price, which represents
the price the Company would sell a promised good or service separately to a customer. The Company determines the standalone selling price
based upon the facts and circumstances of each obligated good or service. The majority of the Company&#8217;s contracts have no observable
standalone selling price since the associated products and services are customized to customer specifications. As such, the standalone
selling price generally reflects the Company&#8217;s forecast of the total cost to satisfy the performance obligation plus an appropriate
profit margin.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"></p>

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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
nature of the Company&#8217;s contracts may give rise to several types of variable considerations, including unpriced change orders and
liquidated damages and penalties. Variable consideration can also arise from modifications to the scope of services. Variable consideration
is included in the transaction price to the extent it is probable that a significant reversal of cumulative revenue recognized will not
occur once the uncertainty associated with the variable consideration is resolved. Our estimates of variable consideration and determination
of whether to include such amounts in the transaction price are based largely on our assessment of legal enforceability, performance
and any other information (historical, current, and forecasted) that is reasonably available to us. There was no variable consideration
as of January 31, 2022 and 2021.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company recognizes revenue when or as it satisfies a performance obligation by transferring a good or service to a customer, either (1)
at a point in time or (2) over time. A good or service is transferred when or as the customer obtains control of it. The evaluation of
whether control of each performance obligation is transferred at a point in time or over time is made at contract inception. Input measures
such as costs incurred or time elapsed are utilized to assess progress against specific contractual performance obligations for the Company&#8217;s
services. The selection of the method to measure progress towards completion requires judgment and is based on the nature of the services
to be provided. For the Company, the input method using costs incurred or time elapsed best represents the measure of progress against
the performance obligations incorporated within the contractual agreements. When the Company&#8217;s estimate of total costs to be incurred
to satisfy the performance obligations exceed revenue, the Company recognizes the loss immediately.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company&#8217;s contracts are either cost plus or fixed price contracts. Under cost plus contracts, customers are billed for actual expenses
incurred plus an agreed-upon fee. Under cost plus contracts, a profit or loss on a project is recognized depending on whether actual
costs are more or less than the agreed upon amount.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company has two types of fixed price contracts, firm fixed price and cost-sharing. Under firm fixed price contracts, the Company receives
an agreed-upon amount for providing products and services specified in the contract, a profit or loss is recognized depending on whether
actual costs are more or less than the agreed upon amount. Under cost-sharing contracts, the fixed amount agreed upon with the customer
is only intended to fund a portion of the costs on a specific project. Under cost sharing contracts, an amount corresponding to the revenue
is recorded in cost of revenues, resulting in gross profit on these contracts of zero. The Company&#8217;s share of the costs is recorded
as product development expense. The Company reports its disaggregation of revenue by contract type since this method best represents
the Company&#8217;s business. For the nine-month periods ended January 31, 2022 and 2021, all of the Company&#8217;s contracts were classified
as firm fixed price.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">As
of January 31, 2022, the Company&#8217;s total remaining performance obligations, also referred to as backlog, totaled <span style="background-color: white">$0.8
</span>million. The Company expects to recognize approximately 100% of the remaining performance obligations as revenue over the next
twelve months.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company also enters into lease arrangements for its PB3 and WAM-V with certain customers. Revenue related to multiple-element arrangements
is allocated to lease and non-lease elements based on their relative standalone selling prices or expected cost plus a margin approach.
Lease elements generally include a PB3 or WAM-V and components, while non-lease elements generally include engineering, monitoring and
support services. In the lease arrangement, the customer is provided an option to extend the lease term or purchase the leased PB3 at
some point during and/or at the end of the lease term.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"></p>

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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company classifies leases as either operating or financing in accordance with the authoritative accounting guidance contained within
ASC Topic 842, <i>&#8220;Leases&#8221;.</i> At inception of the contract, the Company evaluates the lease against the lease classification
criteria within ASC Topic 842. If the direct financing or sales-type classification criteria are met, then the lease is accounted for
as a finance lease. All others are treated as an operating lease.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company recognizes revenue from operating lease arrangements generally on a straight-line basis over the lease term and is presented
in Revenues in the Consolidated Statement of Operations. The lease income for the nine months ended January 31, 2022 and 2021 was immaterial.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
following table provides information regarding the breakdown of our revenues by customer for the three and nine months ended January
31, 2022 and 2021.</span></p>

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<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
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    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="6" style="border-bottom: Black 1.5pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Three
    months ended January 31,</span></td><td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="6" style="border-bottom: Black 1.5pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Nine
    months ended January 31,</span></td><td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
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    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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    <td colspan="2" style="border-bottom: Black 1.5pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">2021</span></td><td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">2022</span></td><td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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    <td colspan="6" style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(in
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  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 36%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Eni
    S.p.A.</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
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    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#8212;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">182</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#8212;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">EGP</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#8212;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">223</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">163</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">379</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">ACET</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#8212;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">33</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#8212;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">37</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Valaris
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    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">7</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#8212;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">142</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#8212;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Brigham
    Young University (2)</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">66</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#8212;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">66</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#8212;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Nippon
    Kaiyo (2)</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">78</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#8212;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">78</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#8212;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Naval
    Surface Warfare Center (2)</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">98</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#8212;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">98</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#8212;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Other
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    <td style="border-bottom: Black 1.5pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">260</span></td><td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">53</span></td><td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
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    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left">$</td><td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">604</span></td><td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  </table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"></span>&#160;</p>

<table cellspacing="0" cellpadding="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="width: 0.25in">&#160;</td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"></span></td>
    <td style="font: 10pt Times New Roman, Times, Serif">(1) <span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">3Dent
    related consulting</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td>&#160;</td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"></span></td>
    <td style="font: 10pt Times New Roman, Times, Serif">(2) <span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">MAR
    related sales</span></td></tr>
  </table>
<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">We
currently focus our sales and marketing efforts globally. The following table shows the percentage of our revenues by geographical location
of our customers for the nine months ended January 31, 2022 and 2021.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="6" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Nine
    months ended January 31,</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Customer
    Location</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">2022</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">2021</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
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    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">1</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">%</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">27</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">%</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">South
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    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">16</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">%</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">63</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">%</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">North
    America</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">83</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">%</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">10</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">%</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">100</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">%</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">100</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">%</span></td></tr>
  </table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>&#160;</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Cost
of revenues</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Our
cost of revenues consists primarily of subcontracts, incurred material, labor and manufacturing overhead expenses, such as engineering
expense, equipment depreciation and maintenance and facility related expenses, and includes the cost of equipment to customize the PowerBuoy&#174;
and our other products supplied by third-party suppliers. Cost of revenues also includes PowerBuoy&#174; and other product system delivery
and deployment expenses and may include anticipated losses at completion on certain contracts.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"></p>

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    <div style="break-before: page; margin-top: 6pt"><table cellpadding="0" cellspacing="0" style="border-collapse: collapse; width: 100%; font-size: 10pt"><tr style="vertical-align: top; text-align: left"><td style="width: 100%"><a href="#toc_001">Table of Contents</a></td></tr></table></div>
    <!-- Field: /Page -->

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Engineering
and product development costs</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Our
engineering and product development costs consist of salaries and other personnel-related costs and the costs of products, materials
and outside services used in our product development and unfunded research activities. Our product development costs relate primarily
to our efforts to increase the power output and reliability of our PowerBuoy&#174; system and other products, to enhance and optimize
data monitoring and controls systems, and to the development of new products, product applications and complementary technologies. We
expense all of our engineering and product development costs as incurred.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Selling,
general and administrative costs</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Our
selling, general and administrative costs consist primarily of professional fees, salaries and other personnel-related costs for employees
and consultants engaged in sales and marketing and support of our products and costs for executive, accounting and administrative personnel,
professional fees and other general corporate expenses.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Interest
income, net</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Interest
income, net consists of interest received on cash, cash equivalents and money market fund and interest paid on certain obligations to
third parties.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Foreign
exchange gain (loss)</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">We
transact business in various countries and have exposure to fluctuations in foreign currency exchange rates. Foreign exchange gains and
losses arise in the translation of foreign-denominated assets and liabilities, which may result in realized and unrealized gains or losses
from exchange rate fluctuations. Since we conduct our business in U.S. dollars and our functional currency is the U.S. dollar, our main
foreign exchange exposure, if any, results from changes in the exchange rate between the U.S. dollar and the British pound sterling,
the Euro and the Australian dollar.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">We
maintain cash accounts that are denominated in British pounds sterling, Euros and Australian dollars. These foreign-denominated accounts
had a balance of $30,000 as of January 31, 2022 and January 31, 2021, compared to our total cash, cash equivalents and restricted cash
balances of $64.1 million as of January 31, 2022 and $80.4 million as of January 31, 2021. These foreign currency balances are translated
each month into our functional currency, and any resulting gain or loss is recognized in our results of operations.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">In
addition, during the nine months ended January 31, 2022, a portion of our operations was conducted through our subsidiaries in countries
other than the United States, specifically Ocean Power Technologies Ltd. in the United Kingdom, the functional currency of which is the
British pound sterling, and Ocean Power Technologies (Australasia) Pty Ltd. in Australia, the functional currency of which is the Australian
dollar. Both of these subsidiaries have foreign exchange exposure that results from changes in the exchange rate between their functional
currency and other foreign currencies in which they conduct business.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">We
currently do not hedge our exchange rate exposure. However, we assess the anticipated foreign currency working capital requirements and
capital asset acquisitions of our foreign operations and attempt to maintain a portion of our cash and cash equivalents denominated in
foreign currencies sufficient to satisfy these anticipated requirements. We also assess the need and cost to utilize financial instruments
to hedge currency exposures on an ongoing basis and may hedge against exchange rate exposure in the future.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Results
of Operations</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">This
section should be read in conjunction with the discussion below under &#8220;Liquidity and Capital Resources.&#8221;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"></p>

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    <div style="break-before: page; margin-top: 6pt"><table cellpadding="0" cellspacing="0" style="border-collapse: collapse; width: 100%; font-size: 10pt"><tr style="vertical-align: top; text-align: left"><td style="width: 100%"><a href="#toc_001">Table of Contents</a></td></tr></table></div>
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>Three
months ended January 31, 2022 compared to the three months ended January 31, 2021</i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
following table contains selected statement of operations information, which serves as the basis of the discussion of our results of
operations for the three months ended January 31, 2022 and 2021.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="6" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Three
    months ended January 31,</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">2022</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">2021</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="6" style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 64%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Revenues</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">317</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Cost
    of revenues</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">597</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">698</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; padding-left: 10pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Gross
    loss</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(113</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">)</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(381</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">)</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Operating
    expenses:</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; padding-left: 10pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Engineering
    and product development costs</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">2,465</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">1,019</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; padding-left: 10pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Selling,
    general and administrative costs</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">2,974</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">1,763</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; padding-left: 20pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Total
    operating expenses</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">5,439</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">2,782</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Operating
    loss</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(5,552</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">)</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(3,163</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">)</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Interest
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    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">16</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">25</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Other
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    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(16</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">)</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Foreign
    exchange gain/(loss)</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">5</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">3</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Loss
    before income taxes</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(5,471</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">)</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(3,151</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">)</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Income
    tax benefit</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#8212;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#8212;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Net
    loss</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(5,471</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">)</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(3,151</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">)</span></td></tr>
  </table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Revenues</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Revenues
for the three months ended January 31, 2022 and 2021 were $0.5 million and $0.3 million, respectively. The year-over-year increase was
primarily due to higher levels of revenue derived from our EGP contract, new revenues related to MAR and new consulting services work
from 3Dent projects as compared to the same period in the prior year.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Cost
of revenues</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Cost
of revenues for the three months ended January 31, 2022 and 2021 were $0.6 million and $0.7 million, respectively. The decrease from
2020 was mostly due to the acquisitions of both MAR and 3Dent, as they have a lower cost ratio related to their revenue.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Engineering
and product development costs</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Engineering
and product development costs for the three months ended January 31, 2022 and 2021 were $2.5 million and $1.0 million, respectively.
The year over year increase is the result of higher spending on new product development <span style="background-color: white">related
to increases in materials, labor, overhead and costs associated with Greensea and Fathom5.</span></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Selling,
general and administrative costs</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Selling,
general and administrative costs for the three months ended January 31, 2022 and 2021 were $3.0 million and $1.8 million, respec<span style="background-color: white">tively.
The increase of $1.2 million for the three months ended January 31, 2022 was primarily due to higher professional fees of $0.7 million,
and employee related costs of $0.3 million. </span></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"></p>

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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>Nine
months ended January 31, 2022 compared to the nine months ended January 31, 2021</i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>&#160;</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
following table contains selected statement of operations information, which serves as the basis of the discussion of our results of
operations for the nine months ended January 31, 2022 and 2021.</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="6" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Nine
    months ended January 31,</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">2022</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">2021</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="6" style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 64%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Revenues</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">1,003</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">604</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Cost
    of revenues</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">1,320</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">1,248</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; padding-left: 10pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Gross
    loss</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(317</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">)</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(644</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">)</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Operating
    expenses:</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; padding-left: 10pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Engineering
    and product development costs</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">7,518</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">3,334</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; padding-left: 10pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Selling,
    general and administrative costs</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">5,591</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; padding-left: 20pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Total
    operating expenses</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">15,451</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">8,925</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Operating
    loss</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(15,768</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">)</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(9,569</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">)</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Interest
    income, net</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">56</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">45</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Other
    expense, net</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">60</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(49</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">)</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Gain
    on forgiveness of PPP loan</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">890</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#8212;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Foreign
    exchange gain</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#8212;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">13</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Loss
    before income taxes</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(14,762</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">)</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(9,560</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">)</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Income
    tax benefit</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">1,041</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#8212;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Net
    loss</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(13,721</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">)</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(9,560</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">)</span></td></tr>
  </table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Revenues</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Revenues
for the nine months ended January 31, 2022 and 2021 were $1.0 million and $0.6 million, respectively. The year-over-year increase was
primarily due to higher levels of revenue derived from our EGP contract, new work from MAR, and new work with 3Dent consulting services
projects as compared to the same period in the prior year.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Cost
of revenues</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Cost
of revenues for the nine months ended January 31, 2022 and 2021 were $1.3 million and $1.2 million, respectively. The increase over 2020
was mostly due to new costs related to MAR sales and higher deployment and material costs incurred on the EGP contract for the nine months
ended January 31, 2022 as compared to the nine months ended January 31, 2021.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Engineering
and product development costs</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Engineering
and product development costs for the nine months ended <span style="background-color: white">January 31, 2022 and 2021 were $7.5 million
and $3.3 million, respectively. The increase of approximately $4.2 million was the result of higher spending on new product development
costs related to increases in materials, labor, overhead and costs associated with subcontractors Greensea and Fathom5.</span></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Selling,
general and administrative costs</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Selling,
general and administrative costs for the nine months ended January 31, 2022 and 2021 were $7.9 million and $5.6 million, respectively.
The increase of $2.3 m<span style="background-color: white">illion for the </span>nine <span style="background-color: white">months ended
January 31, 2022 was primarily due to higher professional fees related to consultants, contractors, legal and accounting of $1.2 million,
employee related costs of $0.6 million and stock compensation expense related to 3Dent  of $0.5 million.</span></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"></p>

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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Forgiveness
</i></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>of Debt</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company filed its loan forgiveness application at the end of February 2021 asking for 100% forgiveness of the loan. In June 2021, the
Company was informed that its application was approved, the loan is now fully forgiven, and the Company recognized a gain on extinguishment
of PPP loan of $0.9 million.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Liquidity
and Capital Resources</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>&#160;</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Our
cash requirements relate primarily to working capital needed to operate and grow our business including funding operating expenses. We
have experienced and continue to experience negative cash flows from operations and net losses. The Company incurred net losses of $13.7
million and $9.6 million for the nine months ended January 31, 2022 and 2021, respectively. Refer to &#8220;Liquidity Outlook&#8221;
below for additional information.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Net
cash used in operating activities</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">During
the nine months ended January 31, 2022, net cash flows used in operating activities was $15.3 million, an increase of $6.8
million compared to net cash used in operating activities during the nine months ended January 31, 2021. This increase is primarily
due to higher project and employee related costs and the payment on the settlement of litigation, discussed in Note 15 to the Consolidated
Financial Statements under Part I, Item 1 of this report, of approximately $1.2 million.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Net
cash used in investing activities</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Net
cash used in investing activities during the nine months ended January 31, 2022 was $3.9 million, compared to zero cash used for investing
activities during the nine months ended January 31, 2021. The net cash used in investing activities was due to spending on the purchase
of property, plant and equipment of $0.3 million and the net acquisition costs of MAR of $3.6 million.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Net
cash used in/provided by financing activities</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Net
cash used in financing activities during the nine months ended January 31, 2022 was $0.1 compared to net cash provided by financing activities
during the nine months ended January 31, 2021 of $78.0 million. The decrease in net cash provided by financing activities reflects the
combination of no capital raises during the first half of fiscal 2022 in addition to proceeds related to the PPP loan and capital raises
related to Aspire and AGP in the prior year.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Effect
of exchange rates on cash and cash equivalents</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
effect of exchange rates on cash and cash equivalents was a decrease of approximately $14,000 during the nine months ended January
31, 2022. The effect of exchange rates on cash and cash equivalents results primarily from gains or losses on consolidation of foreign
subsidiaries and foreign denominated cash and cash equivalents.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Liquidity
Outlook</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Since
our inception, the cash flows from customer revenues have not been sufficient to fund our operations and provide the capital resources
for our business. For the two years ended April 30, 2021 and 2020, our aggregate revenues were $2.9 million, our aggregate net losses
were $25.1 million and our aggregate net cash used in operating activities was $22.3 million.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Our
business is capital intensive, and up through January 31, 2022, we have been funding our business principally through sales of our securities.
As of January 31, 2022, cash and cash equivalents were $63.8 million and we expect to fund our business with this amount and, to a limited
extent, with our revenues until, we generate sufficient cash flow to internally fund our business. Management believes the Company&#8217;s
current cash and cash equivalents is sufficient to fund its planned expenditures through at least March 2023. In addition to the acquisition
of 3Dent in the prior year and MAR in November 2021, the Company is looking at further organic and inorganic growth opportunities to
advance our data and power services and solutions.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"></p>

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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">We
expect to devote substantial resources to continue our development efforts for our products and to expand our sales, marketing and manufacturing
programs associated with the continued commercialization of our products. Our future capital requirements will depend on a number of
factors, including but not limited to:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 0"><tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
<td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in"></td><td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">our
                                            ability to develop, market and commercialize our products, and achieve and sustain profitability;</span></td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-align: justify; text-indent: -0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 0"><tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
<td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in"></td><td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">our
                                            continued development of our proprietary technologies, and expected continued use of cash
                                            from operating activities unless or until we achieve positive cash flow from the commercialization
                                            of our products and services;</span></td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-align: justify; text-indent: -0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 0"><tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
<td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in"></td><td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">our
                                            ability to obtain additional funding, as and if needed which will be subject to several factors,
                                            including market conditions, and our operating performance;</span></td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-align: justify; text-indent: -0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 0"><tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
<td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in"></td><td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">the
                                            continued impact of the COVID-19 pandemic and its variants on our business, operations, customers,
                                            suppliers and manufacturers and personnel;</span></td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-align: justify; text-indent: -0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 0"><tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
<td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in"></td><td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">our
                                            acquisitions and our ability to integrate them into our operations may use significant resources,
                                            be unsuccessful or expose us to unforeseen liabilities;</span></td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-align: justify; text-indent: -0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 0">
  <tr style="vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">our
    ability to meet product development, manufacturing and customer delivery deadlines that may be impacted by disruptions to our supply
    chain, primarily related to labor shortages and manufacturing and transportation delays both here in the U.S. and abroad;&#160;</span></td></tr>
  </table>


<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-align: justify; text-indent: -0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-align: justify; text-indent: -0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 0"><tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
<td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in"></td><td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">our
                                            estimates regarding future expenses, revenues, and capital requirements;</span></td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-align: justify; text-indent: -0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 0"><tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
<td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in"></td><td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">the
                                            adequacy of our cash balances and our need for additional financings;</span></td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-align: justify; text-indent: -0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 0"><tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
<td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in"></td><td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">our
                                            ability to identify and penetrate markets for our products, services, and solutions;</span></td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-align: justify; text-indent: -0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 0"><tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
<td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in"></td><td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">our
                                            ability to implement our commercialization strategy as planned, or at all;</span></td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-align: justify; text-indent: -0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 0"><tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
<td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in"></td><td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">our
                                            relationships with our strategic partners may not be successful and we may not be successful
                                            in establishing additional relationships;</span></td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-align: justify; text-indent: -0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 0"><tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
<td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in"></td><td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">our
                                            ability to maintain the listing of our common stock on the NYSE American;</span></td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-align: justify; text-indent: -0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 0"><tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
<td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in"></td><td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">the
                                            reliability of our technology, products and solutions;</span></td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-align: justify; text-indent: -0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 0"><tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
<td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in"></td><td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">our
                                            ability to improve the power output and survivability of our products;</span></td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-align: justify; text-indent: -0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 0"><tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
<td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in"></td><td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">the
                                            impact of pending and threatened litigation on our business, financial condition and liquidity;</span></td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-align: justify; text-indent: -0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 0"><tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
<td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in"></td><td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">changes
                                            in current legislation, regulations and economic conditions that affect the demand for renewable
                                            energy, or restrict the use of our products;</span></td></tr><tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
<td style="font: 10pt Times New Roman, Times, Serif">&#160;</td><td style="font: 10pt Times New Roman, Times, Serif">&#160;</td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify">&#160;</td></tr>
                                                                                                         <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
<td style="font: 10pt Times New Roman, Times, Serif">&#160;</td><td style="font: 10pt Times New Roman, Times, Serif">&#9679;</td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">our
                                            ability to attract and retain key personnel, including senior management, to achieve our
                                            business objectives;</p>
</td></tr>
                                                                                                         </table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-align: justify; text-indent: -0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 0"><tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
<td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in"></td><td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">our
                                            history of operating losses, which we expect to continue for at least the short term and
                                            possibly longer; and</span></td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-align: justify; text-indent: -0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 0"><tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
<td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in"></td><td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">our
                                            ability to protect our intellectual property portfolio.</span></td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-align: justify; text-indent: -0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-align: justify; text-indent: -0.25in"></p>

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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-align: justify; text-indent: -0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>


<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Off-Balance
Sheet Arrangements</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Since
inception, we have not engaged in any off-balance sheet financing activities.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><span id="ds_010"></span>Item
3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK</b></span></p>



<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>&#160;</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Not
applicable.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><span id="ds_011"></span>Item
4. CONTROLS AND PROCEDURES</b></span></p>



<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>&#160;</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Evaluation
of Disclosure Controls and Procedures</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>&#160;</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Management,
under the supervision and with the participation of our Chief Executive Officer and our Chief Financial Officer, evaluated the effectiveness
of the design and operation of our disclosure controls and procedures as of January 31, 2022 pursuant to Rules 13a-15(b) or 15d-15(b)
of the Securities Exchange Act of 1934, as amended (the &#8220;Exchange Act&#8221;). Disclosure controls and procedures (as defined in
Exchange Act Rules 13a-15(e) and 15d-15(e)) are controls and other procedures that are designed to ensure that information required to
be disclosed by us in the reports we file or submit under the Exchange Act is recorded, processed, summarized and reported within the
time periods specified in the Securities and Exchange Commission&#8217;s (&#8220;SEC&#8221;) rules and forms. Disclosure controls and
procedures include, without limitation, controls and procedures designed to ensure that information required to be disclosed by us in
the reports that we file under the Exchange Act is accumulated and communicated to our management, as appropriate, to allow timely decisions
regarding required disclosure. Based on such evaluation, management concluded that our disclosure controls and procedures were effective
as of January 31, 2022 to ensure that non-financial statement and related disclosure information required to be disclosed by us in the
reports that we file or submit under the Exchange Act is recorded, processed, summarized and reported within the time periods specified
in the SEC&#8217;s rules and forms.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Changes
in Internal Control over Financial Reporting</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">No
change in our internal control over financial reporting (as defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act) occurred
during the fiscal quarter ended January 31, 2022 that has materially affected, or is reasonably likely to materially affect, our internal
control over financial reporting.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>


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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><span id="ds_012"></span>PART
II &#8212; OTHER INFORMATION</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>&#160;</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><span id="ds_013"></span>Item
1. <i>LEGAL PROCEEDINGS</i></b></span></p>



<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>&#160;</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 2pt; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">As
part of our normal business activities, we are party to a number of legal proceedings and other matters in various stages of development.
Management periodically assesses our liabilities and contingencies in connection with these matters based upon the latest information
available. We disclose material pending legal proceedings pursuant to SEC rules and other pending matters as we may determine to be appropriate.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 2pt; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 2pt; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">For
information on matters in dispute, see Note 16 to the Consolidated Financial Statements in our Annual Report on Form10-K for the year
ended April 30, 2021, and Note 15 to the Consolidated Financial Statements under Part I, Item 1 of this report.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 2pt; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><span id="ds_014"></span>Item
1A. <i>RISK FACTORS</i></b></span></p>



<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>&#160;</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
discussion of our business and operations should be read together with the risk factors contained in Item 1A of our Annual Report on
Form 10-K for the year ended April 30, 2021 and set forth below in this Quarterly Report on Form 10-Q. These risk factors describe various
risks and uncertainties to which we are or may become subject. These risks and uncertainties have the potential to affect our business,
financial condition, results of operations, cash flows, strategies or prospects in a material and adverse manner. There have been no
material changes in our risk factors from those disclosed in our Annual Report on Form 10-K filed with the SEC on July 19, 2021.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>We
have a history of operating losses and may not achieve or maintain profitability and positive cash flow.</i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">We
have incurred net losses since we began operations in 1994, including net losses of $13.7 million during the first nine months of fiscal
year 2022 and $14.8 million in fiscal year 2021. As of January 31, 2022, we had an accumulated deficit of $248.6 million. Our losses
to date have resulted primarily from costs incurred in our research and development programs and from our selling, general and administrative
costs. As we continue to develop our proprietary technologies, we expect to continue to have a net use of cash from operating activities
unless or until we achieve positive cash flow from the commercialization of our products and services.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">We
do not know whether we will be able to successfully commercialize our products and solutions, or whether we can achieve profitability.
There is significant uncertainty about our ability to successfully commercialize our products and solutions in our targeted markets.
Even if we do achieve commercialization of our products and solutions and become profitable, we may not be able to achieve or, if achieved,
sustain profitability on a quarterly or annual basis.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><span id="ds_015"></span>Item
2. <i>UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS</i></b></span></p>



<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>&#160;</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">None.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><span id="ds_016"></span>Item
3. <i>DEFAULTS UPON SENIOR SECURITIES</i></b></span></p>



<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>&#160;</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">None.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><span id="ds_017"></span>Item
4. <i>MINE SAFETY DISCLOSURES</i></b></span></p>



<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>&#160;</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Not
applicable.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><span id="ds_018"></span>Item
5. <i>OTHER INFORMATION</i></b></span></p>



<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>&#160;</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">None.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></p>

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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><span id="ds_019"></span>Item
6. <i>EXHIBIT INDEX</i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>&#160;</i></b></span></p>



<table cellspacing="0" cellpadding="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <tr style="font: 10pt Times New Roman, Times, Serif">
    <td style="font: 10pt Times New Roman, Times, Serif; vertical-align: top; width: 0.5in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">10.1</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; width: 0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><a href="https://www.sec.gov/Archives/edgar/data/1378140/000149315221028854/ex10-1.htm" style="-sec-extract: exhibit">Stock Purchase Agreement among Ocean Power Technologies, Inc. and the sellers named therein dated November 15, 2021 (incorporated by reference to Exhibit 10.1 to the Company&#8217;s Current Report on Form 8-K filed on November 16, 2021).</a></span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">10.2</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">***</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><a href="https://www.sec.gov/Archives/edgar/data/1378140/000149315221031190/ex10-1.htm" style="-sec-extract: exhibit">Employment Letter between the Company and Robert P. Powers dated effective December 13, 2021* (incorporated by reference to Exhibit 10.1 to the Company&#8217;s Current Report on Form 8-K filed on December 13, 2021).</a></span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">10.3</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">***</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><a href="https://www.sec.gov/Archives/edgar/data/1378140/000149315221025554/def14a.htm#ed_009" style="-sec-extract: exhibit">Fifth Amendment to 2015 Omnibus Incentive Plan (incorporated by reference to Annex A to Proxy Statement filed on October 15, 2021).</a></span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif">
    <td style="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">31.1</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><a href="ex31-1.htm">Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002</a></span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif">
    <td style="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">31.2</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><a href="ex31-2.htm">Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002</a></span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
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  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
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  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
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  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
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    <td style="font: 10pt Times New Roman, Times, Serif; vertical-align: top"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">104</span></td>
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    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif">
    <td style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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    <td style="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">As
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    statement or prospectus for purposes of Sections 11 or 12 of the Securities Act of 1933, as amended, and shall not be deemed &#8220;filed&#8221;
    for purposes of Section 18 of the Securities Exchange Act of 1934 or otherwise subject to the liability under those sections.</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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  <tr style="font: 10pt Times New Roman, Times, Serif">
    <td style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
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    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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  <tr style="font: 10pt Times New Roman, Times, Serif">
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>


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    <!-- Field: /Page -->

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>SIGNATURES</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Pursuant
to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by
the undersigned thereunto duly authorized.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<table cellspacing="0" cellpadding="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><span style="text-decoration: underline">Ocean
    Power Technologies, Inc. </span></b></span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>(Registrant)</i></span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 50%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 3%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 47%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Date:
    March 14, 2022</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: black 1.5pt solid; font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>/s/
    Philipp Stratmann</i></span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">By:</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Philipp
    Stratmann</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>President
    and Chief Executive Officer</i></span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Date:
    March 14, 2022</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: black 1.5pt solid; font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>/s/
    Robert P. Powers</i></span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">By:</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Robert
    P. Powers</span></td></tr>
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    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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    Vice President and Chief Financial Officer</i></span></td></tr>
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></p>

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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

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</DOCUMENT>
<DOCUMENT>
<TYPE>EX-31.1
<SEQUENCE>2
<FILENAME>ex31-1.htm
<TEXT>
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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; text-align: right; margin: 0pt 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Exhibit
31.1</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>CERTIFICATION
PURSUANT TO SECTION 302 OF SARBANES-OXLEY ACT</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 7.7pt; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">I,
Philipp Stratmann, certify that:</FONT></P>

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<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 0.25in; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">1.</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">I
    have reviewed this Quarterly Report on Form 10-Q of Ocean Power Technologies, Inc.;</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">2.</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Based
    on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary
    to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to
    the period covered by this report;</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">3.</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Based
    on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material
    respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in
    this report;</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">4.</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
    registrant&rsquo;s other certifying officers and I are responsible for establishing and maintaining disclosure controls and procedures
    (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange
    Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:</FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 0.25in; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(a)</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Designed
    such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision,
    to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others
    within those entities, particularly during the period in which this report is being prepared;</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(b)</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Designed
    such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our
    supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements
    for external purposes in accordance with generally accepted accounting principles;</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(c)</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Evaluated
    the effectiveness of the registrant&rsquo;s disclosure controls and procedures and presented in this report our conclusions about
    the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation;
    and</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(d)</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Disclosed
    in this report any change in the registrant&rsquo;s internal control over financial reporting that occurred during the registrant&rsquo;s
    most recent fiscal quarter (the registrant&rsquo;s fourth fiscal quarter in the case of an annual report) that has materially affected,
    or is reasonably likely to materially affect, the registrant&rsquo;s internal control over financial reporting; and</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">5.</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
    registrant&rsquo;s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control
    over financial reporting, to the registrant&rsquo;s auditors and the audit committee of the registrant&rsquo;s board of directors
    (or persons performing the equivalent functions):</FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 0.25in; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(a)</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">All
    significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are
    reasonably likely to adversely affect the registrant&rsquo;s ability to record, process, summarize and report financial information;
    and</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(b)</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Any
    fraud, whether or not material, that involves management or other employees who have a significant role in the registrant&rsquo;s
    internal control over financial reporting.</FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 7.7pt; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1.5pt; width: 50%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; border-bottom: black 1.5pt solid; width: 50%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><I>/s/
    Philipp Stratmann</I></FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Date:
    March 14, 2022</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Philipp
    Stratmann</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><I>President
    and Chief Executive Officer</I></FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 7.7pt; text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

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<DOCUMENT>
<TYPE>EX-31.2
<SEQUENCE>3
<FILENAME>ex31-2.htm
<TEXT>
<HTML>
<HEAD>
     <TITLE></TITLE>
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<BODY STYLE="font: 10pt Times New Roman, Times, Serif">

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 7.7pt; text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 7.7pt; text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Exhibit
31.2</B></FONT></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>CERTIFICATION
PURSUANT TO SECTION 302 OF SARBANES-OXLEY ACT</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 7.7pt; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">I,
Robert P. Powers, certify that:</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 0.25in; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">1.</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">I
    have reviewed this Quarterly Report on Form 10-Q of Ocean Power Technologies, Inc.;</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">2.</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Based
    on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary
    to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to
    the period covered by this report;</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">3.</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Based
    on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material
    respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in
    this report;</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">4.</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
    registrant&rsquo;s other certifying officers and I are responsible for establishing and maintaining disclosure controls and procedures
    (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange
    Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:</FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 0.25in; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(a)</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Designed
    such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision,
    to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others
    within those entities, particularly during the period in which this report is being prepared;</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(b)</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Designed
    such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our
    supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements
    for external purposes in accordance with generally accepted accounting principles;</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(c)</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Evaluated
    the effectiveness of the registrant&rsquo;s disclosure controls and procedures and presented in this report our conclusions about
    the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation;
    and</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(d)</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Disclosed
    in this report any change in the registrant&rsquo;s internal control over financial reporting that occurred during the registrant&rsquo;s
    most recent fiscal quarter (the registrant&rsquo;s fourth fiscal quarter in the case of an annual report) that has materially affected,
    or is reasonably likely to materially affect, the registrant&rsquo;s internal control over financial reporting; and</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">5.</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
    registrant&rsquo;s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control
    over financial reporting, to the registrant&rsquo;s auditors and the audit committee of the registrant&rsquo;s board of directors
    (or persons performing the equivalent functions):</FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 0.25in; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(a)</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">All
    significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are
    reasonably likely to adversely affect the registrant&rsquo;s ability to record, process, summarize and report financial information;
    and</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(b)</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Any
    fraud, whether or not material, that involves management or other employees who have a significant role in the registrant&rsquo;s
    internal control over financial reporting.</FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 7.7pt; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1.5pt; width: 50%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="border-bottom: black 1.5pt solid; font: 10pt Times New Roman, Times, Serif; width: 50%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><I>/s/
    Robert P. Powers</I></FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;Date:
    March 14, 2022</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Robert
    P. Powers</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><I>Senior
    Vice President and Chief Financial Officer</I></FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 7.7pt; text-align: right"></P>

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    <!-- Field: /Page -->

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 7.7pt; text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>


</BODY>
</HTML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-32.1
<SEQUENCE>4
<FILENAME>ex32-1.htm
<TEXT>
<HTML>
<HEAD>
     <TITLE></TITLE>
</HEAD>
<BODY STYLE="font: 10pt Times New Roman, Times, Serif">

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 7.7pt; text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 7.7pt; text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Exhibit
32.1</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 7.7pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>CERTIFICATION
PURSUANT TO 18 U.S.C. SECTION 1350,</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>AS
ADOPTED PURSUANT TO</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>SECTION
906 OF THE SARBANES-OXLEY ACT OF 2002</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 7.7pt; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">In
connection with the Quarterly Report on Form 10-Q of Ocean Power Technologies, Inc. (the &ldquo;Company&rdquo;) for the period ended
January 31, 2022, as filed with the Securities and Exchange Commission on the date hereof (the &ldquo;Report&rdquo;), the undersigned,
Philipp Stratmann, President and Chief Executive Officer of the Company, hereby certifies, pursuant to 18 U.S.C. Section 1350, as adopted
pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to the best of my knowledge:</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 0.25in; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(1)</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
    Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(2)</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
    information contained in the Report fairly presents, in all material respects, the financial condition and results of operations
    of the Company.</FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 7.7pt; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 50%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Date:
    March 14, 2022</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 50%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1.5pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="border-bottom: black 1.5pt solid; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><I>/s/
    Philipp Stratmann</I></FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Philipp
    Stratmann</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><I>President
    and Chief Executive Officer</I></FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 7.7pt; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">A
signed original of this written statement required by Section 906 of the Sarbanes-Oxley Act of 2002 has been provided to the Company
and will be retained by the Company and furnished to the Securities and Exchange Commission or its staff upon request.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: right"></P>

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    <!-- Field: /Page -->

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: right"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>


</BODY>
</HTML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-32.2
<SEQUENCE>5
<FILENAME>ex32-2.htm
<TEXT>
<HTML>
<HEAD>
     <TITLE></TITLE>
</HEAD>
<BODY STYLE="font: 10pt Times New Roman, Times, Serif">

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Exhibit
32.2</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 7.7pt; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>CERTIFICATION
PURSUANT TO 18 U.S.C. SECTION 1350,</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>AS
ADOPTED PURSUANT TO</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>SECTION
906 OF THE SARBANES-OXLEY ACT OF 2002</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 7.7pt; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">In
connection with the Quarterly Report on Form 10-Q of Ocean Power Technologies, Inc. (the &ldquo;Company&rdquo;) for the period ended
January 31, 2022 as filed with the Securities and Exchange Commission on the date hereof (the &ldquo;Report&rdquo;), the undersigned,
Robert P. Powers, Senior Vice President and Chief Financial Officer of the Company, hereby certifies, pursuant to 18 U.S.C. Section 1350,
as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to the best of my knowledge:</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 0.25in; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(1)</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
    Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(2)</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
    information contained in the Report fairly presents, in all material respects, the financial condition and results of operations
    of the Company.</FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 7.7pt; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 50%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Date:
    March 14, 2022</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 50%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1.5pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="border-bottom: black 1.5pt solid; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><I>/s/
    Robert P. Powers</I></FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Robert
    P. Powers</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><I>Senior
    Vice President and Chief Financial Officer</I></FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">A
signed original of this written statement required by Section 906 of the Sarbanes-Oxley Act of 2002 has been provided to the Company
and will be retained by the Company and furnished to the Securities and Exchange Commission or its staff upon request.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"></P>

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    <!-- Field: /Page -->

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>


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<TYPE>EX-101.SCH
<SEQUENCE>6
<FILENAME>optt-20220131.xsd
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</schema>
</XBRL>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-101.CAL
<SEQUENCE>7
<FILENAME>optt-20220131_cal.xml
<DESCRIPTION>XBRL CALCULATION FILE
<TEXT>
<XBRL>
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<DOCUMENT>
<TYPE>EX-101.LAB
<SEQUENCE>9
<FILENAME>optt-20220131_lab.xml
<DESCRIPTION>XBRL LABEL FILE
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      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AwardDateAxis" xlink:label="us-gaap_AwardDateAxis" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AwardDateAxis" xlink:to="us-gaap_AwardDateAxis_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AwardDateAxis_lbl" xml:lang="en-US">Award Date [Axis]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_AugustTwentyTwentyMember" xlink:label="OPTT_AugustTwentyTwentyMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_AugustTwentyTwentyMember" xlink:to="OPTT_AugustTwentyTwentyMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_AugustTwentyTwentyMember_lbl" xml:lang="en-US">August 2020 [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_ForeignFinancialInstitutionsMember" xlink:label="OPTT_ForeignFinancialInstitutionsMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_ForeignFinancialInstitutionsMember" xlink:to="OPTT_ForeignFinancialInstitutionsMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_ForeignFinancialInstitutionsMember_lbl" xml:lang="en-US">Foreign Financial Institutions [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis" xlink:label="us-gaap_ConcentrationRiskByBenchmarkAxis" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ConcentrationRiskByBenchmarkAxis" xlink:to="us-gaap_ConcentrationRiskByBenchmarkAxis_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ConcentrationRiskByBenchmarkAxis_lbl" xml:lang="en-US">Concentration Risk Benchmark [Axis]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SalesRevenueNetMember" xlink:label="us-gaap_SalesRevenueNetMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SalesRevenueNetMember" xlink:to="us-gaap_SalesRevenueNetMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SalesRevenueNetMember_lbl" xml:lang="en-US">Revenue Benchmark [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConcentrationRiskByTypeAxis" xlink:label="us-gaap_ConcentrationRiskByTypeAxis" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ConcentrationRiskByTypeAxis" xlink:to="us-gaap_ConcentrationRiskByTypeAxis_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ConcentrationRiskByTypeAxis_lbl" xml:lang="en-US">Concentration Risk Type [Axis]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CustomerConcentrationRiskMember" xlink:label="us-gaap_CustomerConcentrationRiskMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CustomerConcentrationRiskMember" xlink:to="us-gaap_CustomerConcentrationRiskMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CustomerConcentrationRiskMember_lbl" xml:lang="en-US">Customer Concentration Risk [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MajorCustomersAxis" xlink:label="srt_MajorCustomersAxis" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="srt_MajorCustomersAxis" xlink:to="srt_MajorCustomersAxis_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="srt_MajorCustomersAxis_lbl" xml:lang="en-US">Customer [Axis]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_EniSPAMember" xlink:label="OPTT_EniSPAMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_EniSPAMember" xlink:to="OPTT_EniSPAMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_EniSPAMember_lbl" xml:lang="en-US">Eni S.p.A [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_DepartmentOfEnergyMember" xlink:label="OPTT_DepartmentOfEnergyMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_DepartmentOfEnergyMember" xlink:to="OPTT_DepartmentOfEnergyMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_DepartmentOfEnergyMember_lbl" xml:lang="en-US">Department of Energy [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_EGPMember" xlink:label="OPTT_EGPMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_EGPMember" xlink:to="OPTT_EGPMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_EGPMember_lbl" xml:lang="en-US">EGP [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_ACETMember" xlink:label="OPTT_ACETMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_ACETMember" xlink:to="OPTT_ACETMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_ACETMember_lbl" xml:lang="en-US">ACET [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_ValarisFNIMember" xlink:label="OPTT_ValarisFNIMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_ValarisFNIMember" xlink:to="OPTT_ValarisFNIMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_ValarisFNIMember_lbl" xml:lang="en-US">Valaris FNI [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_BrighamYoungUniversityMember" xlink:label="OPTT_BrighamYoungUniversityMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_BrighamYoungUniversityMember" xlink:to="OPTT_BrighamYoungUniversityMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_BrighamYoungUniversityMember_lbl" xml:lang="en-US">Brigham Young University [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_NipponKaiyoMember" xlink:label="OPTT_NipponKaiyoMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_NipponKaiyoMember" xlink:to="OPTT_NipponKaiyoMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_NipponKaiyoMember_lbl" xml:lang="en-US">Nippon Kaiyo [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_NavalSurfaceWarfareCenterMember" xlink:label="OPTT_NavalSurfaceWarfareCenterMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_NavalSurfaceWarfareCenterMember" xlink:to="OPTT_NavalSurfaceWarfareCenterMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_NavalSurfaceWarfareCenterMember_lbl" xml:lang="en-US">Naval Surface Warfare Center [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_OtherMember" xlink:label="OPTT_OtherMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_OtherMember" xlink:to="OPTT_OtherMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_OtherMember_lbl" xml:lang="en-US">Other [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementLocationAxis" xlink:label="us-gaap_IncomeStatementLocationAxis" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncomeStatementLocationAxis" xlink:to="us-gaap_IncomeStatementLocationAxis_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IncomeStatementLocationAxis_lbl" xml:lang="en-US">Income Statement Location [Axis]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_EngineeringAndProductDevelopmentMember" xlink:label="OPTT_EngineeringAndProductDevelopmentMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_EngineeringAndProductDevelopmentMember" xlink:to="OPTT_EngineeringAndProductDevelopmentMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_EngineeringAndProductDevelopmentMember_lbl" xml:lang="en-US">Engineering and Product Development [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SellingGeneralAndAdministrativeExpensesMember" xlink:label="us-gaap_SellingGeneralAndAdministrativeExpensesMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SellingGeneralAndAdministrativeExpensesMember" xlink:to="us-gaap_SellingGeneralAndAdministrativeExpensesMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SellingGeneralAndAdministrativeExpensesMember_lbl" xml:lang="en-US">Selling, General and Administrative Expenses [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:label="us-gaap_PropertyPlantAndEquipmentByTypeAxis" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:to="us-gaap_PropertyPlantAndEquipmentByTypeAxis_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PropertyPlantAndEquipmentByTypeAxis_lbl" xml:lang="en-US">Long-Lived Tangible Asset [Axis]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquipmentMember" xlink:label="us-gaap_EquipmentMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EquipmentMember" xlink:to="us-gaap_EquipmentMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_EquipmentMember_lbl" xml:lang="en-US">Equipment [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_ComputerEquipmentAndSoftwareMember" xlink:label="OPTT_ComputerEquipmentAndSoftwareMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_ComputerEquipmentAndSoftwareMember" xlink:to="OPTT_ComputerEquipmentAndSoftwareMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_ComputerEquipmentAndSoftwareMember_lbl" xml:lang="en-US">Computer Equipment And Software [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_OfficeFurnitureAndEquipmentMember" xlink:label="OPTT_OfficeFurnitureAndEquipmentMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_OfficeFurnitureAndEquipmentMember" xlink:to="OPTT_OfficeFurnitureAndEquipmentMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_OfficeFurnitureAndEquipmentMember_lbl" xml:lang="en-US">Office Furniture And Equipment [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LeaseholdImprovementsMember" xlink:label="us-gaap_LeaseholdImprovementsMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LeaseholdImprovementsMember" xlink:to="us-gaap_LeaseholdImprovementsMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LeaseholdImprovementsMember_lbl" xml:lang="en-US">Leasehold Improvements [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConstructionInProgressMember" xlink:label="us-gaap_ConstructionInProgressMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ConstructionInProgressMember" xlink:to="us-gaap_ConstructionInProgressMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ConstructionInProgressMember_lbl" xml:lang="en-US">Construction in Progress [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_StatementGeographicalAxis" xlink:label="srt_StatementGeographicalAxis" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="srt_StatementGeographicalAxis" xlink:to="srt_StatementGeographicalAxis_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="srt_StatementGeographicalAxis_lbl" xml:lang="en-US">Geographical [Axis]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_MonroeTownshipMember" xlink:label="OPTT_MonroeTownshipMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_MonroeTownshipMember" xlink:to="OPTT_MonroeTownshipMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_MonroeTownshipMember_lbl" xml:lang="en-US">Monroe Township [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="us-gaap_BusinessAcquisitionAxis" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_BusinessAcquisitionAxis" xlink:to="us-gaap_BusinessAcquisitionAxis_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_BusinessAcquisitionAxis_lbl" xml:lang="en-US">Business Acquisition [Axis]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_ThreeDentAcquisitionMember" xlink:label="OPTT_ThreeDentAcquisitionMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_ThreeDentAcquisitionMember" xlink:to="OPTT_ThreeDentAcquisitionMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_ThreeDentAcquisitionMember_lbl" xml:lang="en-US">3Dent Acquisition [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_JunePurchaseAgreementMember" xlink:label="OPTT_JunePurchaseAgreementMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_JunePurchaseAgreementMember" xlink:to="OPTT_JunePurchaseAgreementMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_JunePurchaseAgreementMember_lbl" xml:lang="en-US">June Purchase Agreement [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_SecondAmendedPurchaseAgreementMember" xlink:label="OPTT_SecondAmendedPurchaseAgreementMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_SecondAmendedPurchaseAgreementMember" xlink:to="OPTT_SecondAmendedPurchaseAgreementMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_SecondAmendedPurchaseAgreementMember_lbl" xml:lang="en-US">Second Amended Purchase Agreement [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_PreFundedWarrantsMember" xlink:label="OPTT_PreFundedWarrantsMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_PreFundedWarrantsMember" xlink:to="OPTT_PreFundedWarrantsMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_PreFundedWarrantsMember_lbl" xml:lang="en-US">Pre-funded Warrants [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_CommonWarrantsMember" xlink:label="OPTT_CommonWarrantsMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_CommonWarrantsMember" xlink:to="OPTT_CommonWarrantsMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_CommonWarrantsMember_lbl" xml:lang="en-US">Common Warrants [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_PaycheckProtectionProgramMember" xlink:label="OPTT_PaycheckProtectionProgramMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_PaycheckProtectionProgramMember" xlink:to="OPTT_PaycheckProtectionProgramMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_PaycheckProtectionProgramMember_lbl" xml:lang="en-US">Paycheck Protection Program [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PlanNameAxis" xlink:label="us-gaap_PlanNameAxis" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PlanNameAxis" xlink:to="us-gaap_PlanNameAxis_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PlanNameAxis_lbl" xml:lang="en-US">Plan Name [Axis]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_TwoThousandAndFifteenOmnibusIncentivePlanMember" xlink:label="OPTT_TwoThousandAndFifteenOmnibusIncentivePlanMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_TwoThousandAndFifteenOmnibusIncentivePlanMember" xlink:to="OPTT_TwoThousandAndFifteenOmnibusIncentivePlanMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_TwoThousandAndFifteenOmnibusIncentivePlanMember_lbl" xml:lang="en-US">2015 Omnibus Incentive Plan [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_TwoThousandAndEighteenInducementPlanMember" xlink:label="OPTT_TwoThousandAndEighteenInducementPlanMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_TwoThousandAndEighteenInducementPlanMember" xlink:to="OPTT_TwoThousandAndEighteenInducementPlanMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_TwoThousandAndEighteenInducementPlanMember_lbl" xml:lang="en-US">2018 Inducement Plan [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="us-gaap_AwardTypeAxis" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AwardTypeAxis" xlink:to="us-gaap_AwardTypeAxis_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AwardTypeAxis_lbl" xml:lang="en-US">Award Type [Axis]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EmployeeStockOptionMember" xlink:label="us-gaap_EmployeeStockOptionMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EmployeeStockOptionMember" xlink:to="us-gaap_EmployeeStockOptionMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_EmployeeStockOptionMember_lbl" xml:lang="en-US">Share-based Payment Arrangement, Option [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_NonVestedStockMember" xlink:label="OPTT_NonVestedStockMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_NonVestedStockMember" xlink:to="OPTT_NonVestedStockMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_NonVestedStockMember_lbl" xml:lang="en-US">Non-vested Stock [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_PerformanceStockOptionsMember" xlink:label="OPTT_PerformanceStockOptionsMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_PerformanceStockOptionsMember" xlink:to="OPTT_PerformanceStockOptionsMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_PerformanceStockOptionsMember_lbl" xml:lang="en-US">Performance Stock Options [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_TitleOfIndividualAxis" xlink:label="srt_TitleOfIndividualAxis" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="srt_TitleOfIndividualAxis" xlink:to="srt_TitleOfIndividualAxis_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="srt_TitleOfIndividualAxis_lbl" xml:lang="en-US">Title of Individual [Axis]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_TwoExecutivesMember" xlink:label="OPTT_TwoExecutivesMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_TwoExecutivesMember" xlink:to="OPTT_TwoExecutivesMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_TwoExecutivesMember_lbl" xml:lang="en-US">Two Executives [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_EmployeesAndExecutivesMember" xlink:label="OPTT_EmployeesAndExecutivesMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_EmployeesAndExecutivesMember" xlink:to="OPTT_EmployeesAndExecutivesMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_EmployeesAndExecutivesMember_lbl" xml:lang="en-US">Employees and Executives [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PerformanceSharesMember" xlink:label="us-gaap_PerformanceSharesMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PerformanceSharesMember" xlink:to="us-gaap_PerformanceSharesMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PerformanceSharesMember_lbl" xml:lang="en-US">Performance Shares [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_NonVestedRestrictedStockMember" xlink:label="OPTT_NonVestedRestrictedStockMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_NonVestedRestrictedStockMember" xlink:to="OPTT_NonVestedRestrictedStockMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_NonVestedRestrictedStockMember_lbl" xml:lang="en-US">Non-vested Restricted Stock [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestrictedStockMember" xlink:label="us-gaap_RestrictedStockMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RestrictedStockMember" xlink:to="us-gaap_RestrictedStockMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RestrictedStockMember_lbl" xml:lang="en-US">Restricted Stock [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_EmployeeMember" xlink:label="OPTT_EmployeeMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_EmployeeMember" xlink:to="OPTT_EmployeeMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_EmployeeMember_lbl" xml:lang="en-US">Employee [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_StatementScenarioAxis" xlink:label="srt_StatementScenarioAxis" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="srt_StatementScenarioAxis" xlink:to="srt_StatementScenarioAxis_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="srt_StatementScenarioAxis_lbl" xml:lang="en-US">Scenario [Axis]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_SubjectToServiceBasedVestingRequirementsMember" xlink:label="OPTT_SubjectToServiceBasedVestingRequirementsMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_SubjectToServiceBasedVestingRequirementsMember" xlink:to="OPTT_SubjectToServiceBasedVestingRequirementsMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_SubjectToServiceBasedVestingRequirementsMember_lbl" xml:lang="en-US">Subject to Service- Based Vesting Requirements [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockOptionMember" xlink:label="us-gaap_StockOptionMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockOptionMember" xlink:to="us-gaap_StockOptionMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockOptionMember_lbl" xml:lang="en-US">Equity Option [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_StockIncentivePlanMember" xlink:label="OPTT_StockIncentivePlanMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_StockIncentivePlanMember" xlink:to="OPTT_StockIncentivePlanMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_StockIncentivePlanMember_lbl" xml:lang="en-US">Stock Incentive Plan [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MinimumMember" xlink:label="srt_MinimumMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="srt_MinimumMember" xlink:to="srt_MinimumMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="srt_MinimumMember_lbl" xml:lang="en-US">Minimum [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:label="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:to="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_lbl" xml:lang="en-US">Related Party [Axis]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_CharlesFDunleavyMember" xlink:label="OPTT_CharlesFDunleavyMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_CharlesFDunleavyMember" xlink:to="OPTT_CharlesFDunleavyMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_CharlesFDunleavyMember_lbl" xml:lang="en-US">Charles F. Dunleavy [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxAuthorityNameAxis" xlink:label="us-gaap_IncomeTaxAuthorityNameAxis" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncomeTaxAuthorityNameAxis" xlink:to="us-gaap_IncomeTaxAuthorityNameAxis_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IncomeTaxAuthorityNameAxis_lbl" xml:lang="en-US">Income Tax Authority, Name [Axis]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TaxAuthoritySpainMember" xlink:label="us-gaap_TaxAuthoritySpainMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_TaxAuthoritySpainMember" xlink:to="us-gaap_TaxAuthoritySpainMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_TaxAuthoritySpainMember_lbl" xml:lang="en-US">Tax Authority, Spain [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_USEmployeesMember" xlink:label="OPTT_USEmployeesMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_USEmployeesMember" xlink:to="OPTT_USEmployeesMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_USEmployeesMember_lbl" xml:lang="en-US">US Employees [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_MarineAdvancedRoboticsIncMember" xlink:label="OPTT_MarineAdvancedRoboticsIncMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_MarineAdvancedRoboticsIncMember" xlink:to="OPTT_MarineAdvancedRoboticsIncMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_MarineAdvancedRoboticsIncMember_lbl" xml:lang="en-US">Marine Advanced Robotics, Inc. [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_MarineAdvanceRoboticsIncMember" xlink:label="OPTT_MarineAdvanceRoboticsIncMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_MarineAdvanceRoboticsIncMember" xlink:to="OPTT_MarineAdvanceRoboticsIncMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_MarineAdvanceRoboticsIncMember_lbl" xml:lang="en-US">Marine Advance Robotics Inc [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis" xlink:label="us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis" xlink:to="us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_lbl" xml:lang="en-US">Indefinite-lived Intangible Assets [Axis]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TradeNamesMember" xlink:label="us-gaap_TradeNamesMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_TradeNamesMember" xlink:to="us-gaap_TradeNamesMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_TradeNamesMember_lbl" xml:lang="en-US">Trade Names [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" xlink:label="us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" xlink:to="us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_lbl" xml:lang="en-US">Finite-Lived Intangible Assets by Major Class [Axis]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PatentsMember" xlink:label="us-gaap_PatentsMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PatentsMember" xlink:to="us-gaap_PatentsMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PatentsMember_lbl" xml:lang="en-US">Patents [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsequentEventTypeAxis" xlink:label="us-gaap_SubsequentEventTypeAxis" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SubsequentEventTypeAxis" xlink:to="us-gaap_SubsequentEventTypeAxis_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SubsequentEventTypeAxis_lbl" xml:lang="en-US">Subsequent Event Type [Axis]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsequentEventMember" xlink:label="us-gaap_SubsequentEventMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SubsequentEventMember" xlink:to="us-gaap_SubsequentEventMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SubsequentEventMember_lbl" xml:lang="en-US">Subsequent Event [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NewJerseyDivisionOfTaxationMember" xlink:label="us-gaap_NewJerseyDivisionOfTaxationMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NewJerseyDivisionOfTaxationMember" xlink:to="us-gaap_NewJerseyDivisionOfTaxationMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NewJerseyDivisionOfTaxationMember_lbl" xml:lang="en-US">New Jersey Division of Taxation [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_CoverAbstract" xlink:label="dei_CoverAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_CoverAbstract" xlink:to="dei_CoverAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_CoverAbstract_lbl" xml:lang="en-US">Cover [Abstract]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_DocumentType" xlink:label="dei_DocumentType" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentType" xlink:to="dei_DocumentType_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentType_lbl" xml:lang="en-US">Document Type</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_AmendmentFlag" xlink:label="dei_AmendmentFlag" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_AmendmentFlag" xlink:to="dei_AmendmentFlag_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_AmendmentFlag_lbl" xml:lang="en-US">Amendment Flag</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_AmendmentDescription" xlink:label="dei_AmendmentDescription" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_AmendmentDescription" xlink:to="dei_AmendmentDescription_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_AmendmentDescription_lbl" xml:lang="en-US">Amendment Description</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_DocumentRegistrationStatement" xlink:label="dei_DocumentRegistrationStatement" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentRegistrationStatement" xlink:to="dei_DocumentRegistrationStatement_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentRegistrationStatement_lbl" xml:lang="en-US">Document Registration Statement</link:label>
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentQuarterlyReport_lbl" xml:lang="en-US">Document Quarterly Report</link:label>
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentTransitionReport" xlink:to="dei_DocumentTransitionReport_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentTransitionReport_lbl" xml:lang="en-US">Document Transition Report</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_DocumentShellCompanyReport" xlink:label="dei_DocumentShellCompanyReport" />
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentShellCompanyReport_lbl" xml:lang="en-US">Document Shell Company Report</link:label>
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentShellCompanyEventDate" xlink:to="dei_DocumentShellCompanyEventDate_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentShellCompanyEventDate_lbl" xml:lang="en-US">Document Shell Company Event Date</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_DocumentPeriodStartDate" xlink:label="dei_DocumentPeriodStartDate" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentPeriodStartDate" xlink:to="dei_DocumentPeriodStartDate_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentPeriodStartDate_lbl" xml:lang="en-US">Document Period Start Date</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_DocumentPeriodEndDate" xlink:label="dei_DocumentPeriodEndDate" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentPeriodEndDate" xlink:to="dei_DocumentPeriodEndDate_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentPeriodEndDate_lbl" xml:lang="en-US">Document Period End Date</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_DocumentFiscalPeriodFocus" xlink:label="dei_DocumentFiscalPeriodFocus" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentFiscalPeriodFocus" xlink:to="dei_DocumentFiscalPeriodFocus_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentFiscalPeriodFocus_lbl" xml:lang="en-US">Document Fiscal Period Focus</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_DocumentFiscalYearFocus" xlink:label="dei_DocumentFiscalYearFocus" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentFiscalYearFocus" xlink:to="dei_DocumentFiscalYearFocus_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentFiscalYearFocus_lbl" xml:lang="en-US">Document Fiscal Year Focus</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_CurrentFiscalYearEndDate" xlink:label="dei_CurrentFiscalYearEndDate" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_CurrentFiscalYearEndDate" xlink:to="dei_CurrentFiscalYearEndDate_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_CurrentFiscalYearEndDate_lbl" xml:lang="en-US">Current Fiscal Year End Date</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityFileNumber" xlink:label="dei_EntityFileNumber" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityFileNumber" xlink:to="dei_EntityFileNumber_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityFileNumber_lbl" xml:lang="en-US">Entity File Number</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityRegistrantName" xlink:label="dei_EntityRegistrantName" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityRegistrantName" xlink:to="dei_EntityRegistrantName_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityRegistrantName_lbl" xml:lang="en-US">Entity Registrant Name</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityCentralIndexKey" xlink:label="dei_EntityCentralIndexKey" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityCentralIndexKey" xlink:to="dei_EntityCentralIndexKey_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityCentralIndexKey_lbl" xml:lang="en-US">Entity Central Index Key</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityPrimarySicNumber" xlink:label="dei_EntityPrimarySicNumber" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityPrimarySicNumber" xlink:to="dei_EntityPrimarySicNumber_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityPrimarySicNumber_lbl" xml:lang="en-US">Entity Primary SIC Number</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityTaxIdentificationNumber" xlink:label="dei_EntityTaxIdentificationNumber" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityTaxIdentificationNumber" xlink:to="dei_EntityTaxIdentificationNumber_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityTaxIdentificationNumber_lbl" xml:lang="en-US">Entity Tax Identification Number</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityIncorporationStateCountryCode" xlink:label="dei_EntityIncorporationStateCountryCode" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityIncorporationStateCountryCode" xlink:to="dei_EntityIncorporationStateCountryCode_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityIncorporationStateCountryCode_lbl" xml:lang="en-US">Entity Incorporation, State or Country Code</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityAddressAddressLine1" xlink:label="dei_EntityAddressAddressLine1" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityAddressAddressLine1" xlink:to="dei_EntityAddressAddressLine1_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityAddressAddressLine1_lbl" xml:lang="en-US">Entity Address, Address Line One</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityAddressAddressLine2" xlink:label="dei_EntityAddressAddressLine2" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityAddressAddressLine2" xlink:to="dei_EntityAddressAddressLine2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityAddressAddressLine2_lbl" xml:lang="en-US">Entity Address, Address Line Two</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityAddressAddressLine3" xlink:label="dei_EntityAddressAddressLine3" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityAddressAddressLine3" xlink:to="dei_EntityAddressAddressLine3_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityAddressAddressLine3_lbl" xml:lang="en-US">Entity Address, Address Line Three</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityAddressCityOrTown" xlink:label="dei_EntityAddressCityOrTown" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityAddressCityOrTown" xlink:to="dei_EntityAddressCityOrTown_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityAddressCityOrTown_lbl" xml:lang="en-US">Entity Address, City or Town</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityAddressStateOrProvince" xlink:label="dei_EntityAddressStateOrProvince" />
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityAddressStateOrProvince_lbl" xml:lang="en-US">Entity Address, State or Province</link:label>
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityAddressCountry_lbl" xml:lang="en-US">Entity Address, Country</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityAddressPostalZipCode" xlink:label="dei_EntityAddressPostalZipCode" />
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityAddressPostalZipCode_lbl" xml:lang="en-US">Entity Address, Postal Zip Code</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_CountryRegion" xlink:label="dei_CountryRegion" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_CountryRegion" xlink:to="dei_CountryRegion_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_CountryRegion_lbl" xml:lang="en-US">Country Region</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_CityAreaCode" xlink:label="dei_CityAreaCode" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_CityAreaCode" xlink:to="dei_CityAreaCode_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_CityAreaCode_lbl" xml:lang="en-US">City Area Code</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_LocalPhoneNumber" xlink:label="dei_LocalPhoneNumber" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_LocalPhoneNumber" xlink:to="dei_LocalPhoneNumber_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_LocalPhoneNumber_lbl" xml:lang="en-US">Local Phone Number</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_Extension" xlink:label="dei_Extension" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_Extension" xlink:to="dei_Extension_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_Extension_lbl" xml:lang="en-US">Extension</link:label>
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_WrittenCommunications" xlink:to="dei_WrittenCommunications_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_WrittenCommunications_lbl" xml:lang="en-US">Written Communications</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_SolicitingMaterial" xlink:label="dei_SolicitingMaterial" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_SolicitingMaterial" xlink:to="dei_SolicitingMaterial_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_SolicitingMaterial_lbl" xml:lang="en-US">Soliciting Material</link:label>
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_PreCommencementTenderOffer" xlink:to="dei_PreCommencementTenderOffer_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_PreCommencementTenderOffer_lbl" xml:lang="en-US">Pre-commencement Tender Offer</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_PreCommencementIssuerTenderOffer" xlink:label="dei_PreCommencementIssuerTenderOffer" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_PreCommencementIssuerTenderOffer" xlink:to="dei_PreCommencementIssuerTenderOffer_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_PreCommencementIssuerTenderOffer_lbl" xml:lang="en-US">Pre-commencement Issuer Tender Offer</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_Security12bTitle" xlink:label="dei_Security12bTitle" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_Security12bTitle" xlink:to="dei_Security12bTitle_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_Security12bTitle_lbl" xml:lang="en-US">Title of 12(b) Security</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_NoTradingSymbolFlag" xlink:label="dei_NoTradingSymbolFlag" />
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_NoTradingSymbolFlag_lbl" xml:lang="en-US">No Trading Symbol Flag</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_TradingSymbol" xlink:label="dei_TradingSymbol" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_TradingSymbol" xlink:to="dei_TradingSymbol_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_TradingSymbol_lbl" xml:lang="en-US">Trading Symbol</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_SecurityExchangeName" xlink:label="dei_SecurityExchangeName" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_SecurityExchangeName" xlink:to="dei_SecurityExchangeName_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_SecurityExchangeName_lbl" xml:lang="en-US">Security Exchange Name</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_Security12gTitle" xlink:label="dei_Security12gTitle" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_Security12gTitle" xlink:to="dei_Security12gTitle_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_Security12gTitle_lbl" xml:lang="en-US">Title of 12(g) Security</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_SecurityReportingObligation" xlink:label="dei_SecurityReportingObligation" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_SecurityReportingObligation" xlink:to="dei_SecurityReportingObligation_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_SecurityReportingObligation_lbl" xml:lang="en-US">Security Reporting Obligation</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_AnnualInformationForm" xlink:label="dei_AnnualInformationForm" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_AnnualInformationForm" xlink:to="dei_AnnualInformationForm_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_AnnualInformationForm_lbl" xml:lang="en-US">Annual Information Form</link:label>
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_AuditedAnnualFinancialStatements_lbl" xml:lang="en-US">Audited Annual Financial Statements</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityWellKnownSeasonedIssuer" xlink:label="dei_EntityWellKnownSeasonedIssuer" />
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityWellKnownSeasonedIssuer_lbl" xml:lang="en-US">Entity Well-known Seasoned Issuer</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityVoluntaryFilers" xlink:label="dei_EntityVoluntaryFilers" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityVoluntaryFilers" xlink:to="dei_EntityVoluntaryFilers_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityVoluntaryFilers_lbl" xml:lang="en-US">Entity Voluntary Filers</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityCurrentReportingStatus" xlink:label="dei_EntityCurrentReportingStatus" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityCurrentReportingStatus" xlink:to="dei_EntityCurrentReportingStatus_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityCurrentReportingStatus_lbl" xml:lang="en-US">Entity Current Reporting Status</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityInteractiveDataCurrent" xlink:label="dei_EntityInteractiveDataCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityInteractiveDataCurrent" xlink:to="dei_EntityInteractiveDataCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityInteractiveDataCurrent_lbl" xml:lang="en-US">Entity Interactive Data Current</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityFilerCategory" xlink:label="dei_EntityFilerCategory" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityFilerCategory" xlink:to="dei_EntityFilerCategory_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityFilerCategory_lbl" xml:lang="en-US">Entity Filer Category</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntitySmallBusiness" xlink:label="dei_EntitySmallBusiness" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntitySmallBusiness" xlink:to="dei_EntitySmallBusiness_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntitySmallBusiness_lbl" xml:lang="en-US">Entity Small Business</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityEmergingGrowthCompany" xlink:label="dei_EntityEmergingGrowthCompany" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityEmergingGrowthCompany" xlink:to="dei_EntityEmergingGrowthCompany_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityEmergingGrowthCompany_lbl" xml:lang="en-US">Entity Emerging Growth Company</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityExTransitionPeriod" xlink:label="dei_EntityExTransitionPeriod" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityExTransitionPeriod" xlink:to="dei_EntityExTransitionPeriod_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityExTransitionPeriod_lbl" xml:lang="en-US">Elected Not To Use the Extended Transition Period</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_DocumentAccountingStandard" xlink:label="dei_DocumentAccountingStandard" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentAccountingStandard" xlink:to="dei_DocumentAccountingStandard_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentAccountingStandard_lbl" xml:lang="en-US">Document Accounting Standard</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_OtherReportingStandardItemNumber" xlink:label="dei_OtherReportingStandardItemNumber" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_OtherReportingStandardItemNumber" xlink:to="dei_OtherReportingStandardItemNumber_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_OtherReportingStandardItemNumber_lbl" xml:lang="en-US">Other Reporting Standard Item Number</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityShellCompany" xlink:label="dei_EntityShellCompany" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityShellCompany" xlink:to="dei_EntityShellCompany_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityShellCompany_lbl" xml:lang="en-US">Entity Shell Company</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityPublicFloat" xlink:label="dei_EntityPublicFloat" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityPublicFloat" xlink:to="dei_EntityPublicFloat_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityPublicFloat_lbl" xml:lang="en-US">Entity Public Float</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityBankruptcyProceedingsReportingCurrent" xlink:label="dei_EntityBankruptcyProceedingsReportingCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityBankruptcyProceedingsReportingCurrent" xlink:to="dei_EntityBankruptcyProceedingsReportingCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityBankruptcyProceedingsReportingCurrent_lbl" xml:lang="en-US">Entity Bankruptcy Proceedings, Reporting Current</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityCommonStockSharesOutstanding" xlink:label="dei_EntityCommonStockSharesOutstanding" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityCommonStockSharesOutstanding" xlink:to="dei_EntityCommonStockSharesOutstanding_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityCommonStockSharesOutstanding_lbl" xml:lang="en-US">Entity Common Stock, Shares Outstanding</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_DocumentsIncorporatedByReferenceTextBlock" xlink:label="dei_DocumentsIncorporatedByReferenceTextBlock" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentsIncorporatedByReferenceTextBlock" xlink:to="dei_DocumentsIncorporatedByReferenceTextBlock_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentsIncorporatedByReferenceTextBlock_lbl" xml:lang="en-US">Documents Incorporated by Reference [Text Block]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementOfFinancialPositionAbstract" xlink:label="us-gaap_StatementOfFinancialPositionAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StatementOfFinancialPositionAbstract" xlink:to="us-gaap_StatementOfFinancialPositionAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StatementOfFinancialPositionAbstract_lbl" xml:lang="en-US">Statement of Financial Position [Abstract]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AssetsAbstract" xlink:label="us-gaap_AssetsAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AssetsAbstract" xlink:to="us-gaap_AssetsAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AssetsAbstract_lbl" xml:lang="en-US">ASSETS</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AssetsCurrentAbstract" xlink:label="us-gaap_AssetsCurrentAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AssetsCurrentAbstract" xlink:to="us-gaap_AssetsCurrentAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AssetsCurrentAbstract_lbl" xml:lang="en-US">Current assets:</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="us-gaap_CashAndCashEquivalentsAtCarryingValue" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:to="us-gaap_CashAndCashEquivalentsAtCarryingValue_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CashAndCashEquivalentsAtCarryingValue_lbl" xml:lang="en-US">Cash and cash equivalents</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestrictedCashCurrent" xlink:label="us-gaap_RestrictedCashCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RestrictedCashCurrent" xlink:to="us-gaap_RestrictedCashCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RestrictedCashCurrent_lbl" xml:lang="en-US">Restricted cash, short-term</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccountsReceivableNetCurrent" xlink:label="us-gaap_AccountsReceivableNetCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AccountsReceivableNetCurrent" xlink:to="us-gaap_AccountsReceivableNetCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AccountsReceivableNetCurrent_lbl" xml:lang="en-US">Accounts receivable</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ContractWithCustomerAssetNetCurrent" xlink:label="us-gaap_ContractWithCustomerAssetNetCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ContractWithCustomerAssetNetCurrent" xlink:to="us-gaap_ContractWithCustomerAssetNetCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ContractWithCustomerAssetNetCurrent_lbl" xml:lang="en-US">Contract assets</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InventoryNet" xlink:label="us-gaap_InventoryNet" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InventoryNet" xlink:to="us-gaap_InventoryNet_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InventoryNet_lbl" xml:lang="en-US">Inventory</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherAssetsCurrent" xlink:label="us-gaap_OtherAssetsCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OtherAssetsCurrent" xlink:to="us-gaap_OtherAssetsCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OtherAssetsCurrent_lbl" xml:lang="en-US">Other current assets</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AssetsCurrent" xlink:label="us-gaap_AssetsCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AssetsCurrent" xlink:to="us-gaap_AssetsCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_AssetsCurrent_lbl" xml:lang="en-US">Total current assets</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="us-gaap_PropertyPlantAndEquipmentNet" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PropertyPlantAndEquipmentNet" xlink:to="us-gaap_PropertyPlantAndEquipmentNet_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PropertyPlantAndEquipmentNet_lbl" xml:lang="en-US">Property and equipment, net</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill" xlink:label="us-gaap_IntangibleAssetsNetExcludingGoodwill" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IntangibleAssetsNetExcludingGoodwill" xlink:to="us-gaap_IntangibleAssetsNetExcludingGoodwill_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IntangibleAssetsNetExcludingGoodwill_lbl" xml:lang="en-US">Intangibles, net</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingLeaseRightOfUseAsset" xlink:label="us-gaap_OperatingLeaseRightOfUseAsset" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingLeaseRightOfUseAsset" xlink:to="us-gaap_OperatingLeaseRightOfUseAsset_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OperatingLeaseRightOfUseAsset_lbl" xml:lang="en-US">Right-of-use asset, net</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestrictedCashNoncurrent" xlink:label="us-gaap_RestrictedCashNoncurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RestrictedCashNoncurrent" xlink:to="us-gaap_RestrictedCashNoncurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RestrictedCashNoncurrent_lbl" xml:lang="en-US">Restricted cash, long-term</link:label>
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_Assets" xlink:to="us-gaap_Assets_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_Assets_lbl" xml:lang="en-US">Total assets</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:label="us-gaap_LiabilitiesAndStockholdersEquityAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:to="us-gaap_LiabilitiesAndStockholdersEquityAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LiabilitiesAndStockholdersEquityAbstract_lbl" xml:lang="en-US">LIABILITIES AND SHAREHOLDERS&#8217; EQUITY</link:label>
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LiabilitiesCurrentAbstract" xlink:to="us-gaap_LiabilitiesCurrentAbstract_lbl" xlink:type="arc" />
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AccountsPayableCurrent_lbl" xml:lang="en-US">Accounts payable</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccruedLiabilitiesCurrent" xlink:label="us-gaap_AccruedLiabilitiesCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AccruedLiabilitiesCurrent" xlink:to="us-gaap_AccruedLiabilitiesCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AccruedLiabilitiesCurrent_lbl" xml:lang="en-US">Accrued expenses</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ContractWithCustomerLiabilityCurrent" xlink:label="us-gaap_ContractWithCustomerLiabilityCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ContractWithCustomerLiabilityCurrent" xlink:to="us-gaap_ContractWithCustomerLiabilityCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ContractWithCustomerLiabilityCurrent_lbl" xml:lang="en-US">Contract liabilities</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingLeaseLiabilityCurrent" xlink:label="us-gaap_OperatingLeaseLiabilityCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingLeaseLiabilityCurrent" xlink:to="us-gaap_OperatingLeaseLiabilityCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OperatingLeaseLiabilityCurrent_lbl" xml:lang="en-US">Right-of-use liability, current portion</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_AdvancePayableCurrent" xlink:label="OPTT_AdvancePayableCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_AdvancePayableCurrent" xlink:to="OPTT_AdvancePayableCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_AdvancePayableCurrent_lbl" xml:lang="en-US">Advance payable</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LitigationReserveCurrent" xlink:label="us-gaap_LitigationReserveCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LitigationReserveCurrent" xlink:to="us-gaap_LitigationReserveCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LitigationReserveCurrent_lbl" xml:lang="en-US">Litigation payable</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationContingentConsiderationLiabilityCurrent" xlink:label="us-gaap_BusinessCombinationContingentConsiderationLiabilityCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_BusinessCombinationContingentConsiderationLiabilityCurrent" xlink:to="us-gaap_BusinessCombinationContingentConsiderationLiabilityCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_BusinessCombinationContingentConsiderationLiabilityCurrent_lbl" xml:lang="en-US">Contingent liabilities</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongTermDebtCurrent" xlink:label="us-gaap_LongTermDebtCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LongTermDebtCurrent" xlink:to="us-gaap_LongTermDebtCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LongTermDebtCurrent_lbl" xml:lang="en-US">Paycheck protection program loan- current</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LiabilitiesCurrent" xlink:label="us-gaap_LiabilitiesCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LiabilitiesCurrent" xlink:to="us-gaap_LiabilitiesCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_LiabilitiesCurrent_lbl" xml:lang="en-US">Total current liabilities</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongTermDebtNoncurrent" xlink:label="us-gaap_LongTermDebtNoncurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LongTermDebtNoncurrent" xlink:to="us-gaap_LongTermDebtNoncurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LongTermDebtNoncurrent_lbl" xml:lang="en-US">Paycheck protection program loan, less current portion</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent" xlink:label="us-gaap_OperatingLeaseLiabilityNoncurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingLeaseLiabilityNoncurrent" xlink:to="us-gaap_OperatingLeaseLiabilityNoncurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OperatingLeaseLiabilityNoncurrent_lbl" xml:lang="en-US">Right-of-use liability, less current portion</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Liabilities" xlink:label="us-gaap_Liabilities" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_Liabilities" xlink:to="us-gaap_Liabilities_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_Liabilities_lbl" xml:lang="en-US">Total liabilities</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommitmentsAndContingencies" xlink:label="us-gaap_CommitmentsAndContingencies" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommitmentsAndContingencies" xlink:to="us-gaap_CommitmentsAndContingencies_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CommitmentsAndContingencies_lbl" xml:lang="en-US">Commitments and contingencies (Note 15)</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockholdersEquityAbstract" xlink:label="us-gaap_StockholdersEquityAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockholdersEquityAbstract" xlink:to="us-gaap_StockholdersEquityAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockholdersEquityAbstract_lbl" xml:lang="en-US">Shareholders&#8217; Equity:</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PreferredStockValue" xlink:label="us-gaap_PreferredStockValue" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PreferredStockValue" xlink:to="us-gaap_PreferredStockValue_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PreferredStockValue_lbl" xml:lang="en-US">Preferred stock, $0.001 par value; authorized 5,000,000 shares, none issued or outstanding</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockValue" xlink:label="us-gaap_CommonStockValue" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommonStockValue" xlink:to="us-gaap_CommonStockValue_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CommonStockValue_lbl" xml:lang="en-US">Common stock, $0.001 par value; authorized 100,000,000 shares, issued 55,894,213 and 52,458,011 shares, respectively</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TreasuryStockValue" xlink:label="us-gaap_TreasuryStockValue" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_TreasuryStockValue" xlink:to="us-gaap_TreasuryStockValue_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_TreasuryStockValue_lbl" xml:lang="en-US">Treasury stock, at cost; 21,040 shares</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AdditionalPaidInCapital" xlink:label="us-gaap_AdditionalPaidInCapital" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AdditionalPaidInCapital" xlink:to="us-gaap_AdditionalPaidInCapital_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AdditionalPaidInCapital_lbl" xml:lang="en-US">Additional paid-in capital</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RetainedEarningsAccumulatedDeficit" xlink:label="us-gaap_RetainedEarningsAccumulatedDeficit" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RetainedEarningsAccumulatedDeficit" xlink:to="us-gaap_RetainedEarningsAccumulatedDeficit_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RetainedEarningsAccumulatedDeficit_lbl" xml:lang="en-US">Accumulated deficit</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:label="us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:to="us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_lbl" xml:lang="en-US">Accumulated other comprehensive loss</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockholdersEquity" xlink:label="us-gaap_StockholdersEquity" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockholdersEquity" xlink:to="us-gaap_StockholdersEquity_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_StockholdersEquity_lbl" xml:lang="en-US">Total shareholders&#8217; equity</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity" xlink:label="us-gaap_LiabilitiesAndStockholdersEquity" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LiabilitiesAndStockholdersEquity" xlink:to="us-gaap_LiabilitiesAndStockholdersEquity_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_LiabilitiesAndStockholdersEquity_lbl" xml:lang="en-US">Total liabilities and shareholders&#8217; equity</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PreferredStockParOrStatedValuePerShare" xlink:label="us-gaap_PreferredStockParOrStatedValuePerShare" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PreferredStockParOrStatedValuePerShare" xlink:to="us-gaap_PreferredStockParOrStatedValuePerShare_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PreferredStockParOrStatedValuePerShare_lbl" xml:lang="en-US">Preferred stock, par value</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PreferredStockSharesAuthorized" xlink:label="us-gaap_PreferredStockSharesAuthorized" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PreferredStockSharesAuthorized" xlink:to="us-gaap_PreferredStockSharesAuthorized_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PreferredStockSharesAuthorized_lbl" xml:lang="en-US">Preferred stock, shares authorized</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PreferredStockSharesIssued" xlink:label="us-gaap_PreferredStockSharesIssued" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PreferredStockSharesIssued" xlink:to="us-gaap_PreferredStockSharesIssued_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PreferredStockSharesIssued_lbl" xml:lang="en-US">Preferred stock, shares issued</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PreferredStockSharesOutstanding" xlink:label="us-gaap_PreferredStockSharesOutstanding" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PreferredStockSharesOutstanding" xlink:to="us-gaap_PreferredStockSharesOutstanding_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PreferredStockSharesOutstanding_lbl" xml:lang="en-US">Preferred stock, shares outstanding</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockParOrStatedValuePerShare" xlink:label="us-gaap_CommonStockParOrStatedValuePerShare" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommonStockParOrStatedValuePerShare" xlink:to="us-gaap_CommonStockParOrStatedValuePerShare_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CommonStockParOrStatedValuePerShare_lbl" xml:lang="en-US">Common stock, par value</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockSharesAuthorized" xlink:label="us-gaap_CommonStockSharesAuthorized" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommonStockSharesAuthorized" xlink:to="us-gaap_CommonStockSharesAuthorized_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CommonStockSharesAuthorized_lbl" xml:lang="en-US">Common stock, shares authorized</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockSharesIssued" xlink:label="us-gaap_CommonStockSharesIssued" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommonStockSharesIssued" xlink:to="us-gaap_CommonStockSharesIssued_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CommonStockSharesIssued_lbl" xml:lang="en-US">Common stock, shares issued</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TreasuryStockShares" xlink:label="us-gaap_TreasuryStockShares" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_TreasuryStockShares" xlink:to="us-gaap_TreasuryStockShares_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_TreasuryStockShares_lbl" xml:lang="en-US">Treasury stock, shares</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementAbstract" xlink:label="us-gaap_IncomeStatementAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncomeStatementAbstract" xlink:to="us-gaap_IncomeStatementAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IncomeStatementAbstract_lbl" xml:lang="en-US">Income Statement [Abstract]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax" xlink:label="us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax" xlink:to="us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_lbl" xml:lang="en-US">Revenues</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CostOfRevenue" xlink:label="us-gaap_CostOfRevenue" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CostOfRevenue" xlink:to="us-gaap_CostOfRevenue_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CostOfRevenue_lbl" xml:lang="en-US">Cost of revenues</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GrossProfit" xlink:label="us-gaap_GrossProfit" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_GrossProfit" xlink:to="us-gaap_GrossProfit_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_GrossProfit_lbl" xml:lang="en-US">Gross loss</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingExpensesAbstract" xlink:label="us-gaap_OperatingExpensesAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingExpensesAbstract" xlink:to="us-gaap_OperatingExpensesAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OperatingExpensesAbstract_lbl" xml:lang="en-US">Operating expenses:</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost" xlink:label="us-gaap_ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost" xlink:to="us-gaap_ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost_lbl" xlink:type="arc" />
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SellingGeneralAndAdministrativeExpense" xlink:to="us-gaap_SellingGeneralAndAdministrativeExpense_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SellingGeneralAndAdministrativeExpense_lbl" xml:lang="en-US">Selling, general and administrative costs</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingExpenses" xlink:label="us-gaap_OperatingExpenses" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingExpenses" xlink:to="us-gaap_OperatingExpenses_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_OperatingExpenses_lbl" xml:lang="en-US">Total operating expenses</link:label>
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingIncomeLoss" xlink:to="us-gaap_OperatingIncomeLoss_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_OperatingIncomeLoss_lbl" xml:lang="en-US">Operating loss</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InterestIncomeExpenseNet" xlink:label="us-gaap_InterestIncomeExpenseNet" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InterestIncomeExpenseNet" xlink:to="us-gaap_InterestIncomeExpenseNet_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InterestIncomeExpenseNet_lbl" xml:lang="en-US">Interest income, net</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherNonoperatingIncomeExpense" xlink:label="us-gaap_OtherNonoperatingIncomeExpense" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OtherNonoperatingIncomeExpense" xlink:to="us-gaap_OtherNonoperatingIncomeExpense_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OtherNonoperatingIncomeExpense_lbl" xml:lang="en-US">Other income (expense), net</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt" xlink:label="us-gaap_GainsLossesOnExtinguishmentOfDebt" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_GainsLossesOnExtinguishmentOfDebt" xlink:to="us-gaap_GainsLossesOnExtinguishmentOfDebt_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_GainsLossesOnExtinguishmentOfDebt_lbl" xml:lang="en-US">Gain on extinguishment of PPP loan</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ForeignCurrencyTransactionGainLossBeforeTax" xlink:label="us-gaap_ForeignCurrencyTransactionGainLossBeforeTax" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ForeignCurrencyTransactionGainLossBeforeTax" xlink:to="us-gaap_ForeignCurrencyTransactionGainLossBeforeTax_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ForeignCurrencyTransactionGainLossBeforeTax_lbl" xml:lang="en-US">Foreign exchange gain</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest" xlink:label="us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest" xlink:to="us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_lbl" xml:lang="en-US">Loss before income taxes</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="us-gaap_IncomeTaxExpenseBenefit" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncomeTaxExpenseBenefit" xlink:to="us-gaap_IncomeTaxExpenseBenefit_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_IncomeTaxExpenseBenefit_lbl" xml:lang="en-US">Income tax benefit</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="us-gaap_NetIncomeLoss" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetIncomeLoss" xlink:to="us-gaap_NetIncomeLoss_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_NetIncomeLoss_lbl" xml:lang="en-US">Net loss</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EarningsPerShareBasicAndDiluted" xlink:label="us-gaap_EarningsPerShareBasicAndDiluted" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EarningsPerShareBasicAndDiluted" xlink:to="us-gaap_EarningsPerShareBasicAndDiluted_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_EarningsPerShareBasicAndDiluted_lbl" xml:lang="en-US">Basic and diluted net loss per common share</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted" xlink:label="us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted" xlink:to="us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted_lbl" xml:lang="en-US">Weighted average common shares used to compute basic and diluted net loss per common share</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetIncomeLoss" xlink:to="us-gaap_NetIncomeLoss_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NetIncomeLoss_2_lbl" xml:lang="en-US">Net loss</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax" xlink:label="us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax" xlink:to="us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_lbl" xml:lang="en-US">Foreign currency translation adjustment</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest" xlink:label="us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest" xlink:to="us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_lbl" xml:lang="en-US">Total comprehensive loss</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementTable" xlink:label="us-gaap_StatementTable" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StatementTable" xlink:to="us-gaap_StatementTable_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StatementTable_lbl" xml:lang="en-US">Statement [Table]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementLineItems" xlink:label="us-gaap_StatementLineItems" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_StatementLineItems_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StatementLineItems_lbl" xml:lang="en-US">Statement [Line Items]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockholdersEquity" xlink:to="us-gaap_StockholdersEquity_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="us-gaap_StockholdersEquity_2_lbl" xml:lang="en-US">Beginning balances</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SharesOutstanding" xlink:label="us-gaap_SharesOutstanding" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SharesOutstanding" xlink:to="us-gaap_SharesOutstanding_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="us-gaap_SharesOutstanding_lbl" xml:lang="en-US">Beginning balance, shares</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue" xlink:label="us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue" xlink:to="us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_lbl" xml:lang="en-US">Share-based compensation</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised" xlink:label="us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised" xlink:to="us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_lbl" xml:lang="en-US">Proceeds from stock options exercises</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised" xlink:label="us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised" xlink:to="us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_lbl" xml:lang="en-US">Proceeds from stock options exercises, shares</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_ExerciseOfCommonWarrantsNetOfCosts" xlink:label="OPTT_ExerciseOfCommonWarrantsNetOfCosts" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_ExerciseOfCommonWarrantsNetOfCosts" xlink:to="OPTT_ExerciseOfCommonWarrantsNetOfCosts_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_ExerciseOfCommonWarrantsNetOfCosts_lbl" xml:lang="en-US">Exercise of common warrants, net of costs</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_ExerciseOfCommonWarrantsNetOfCostsShares" xlink:label="OPTT_ExerciseOfCommonWarrantsNetOfCostsShares" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_ExerciseOfCommonWarrantsNetOfCostsShares" xlink:to="OPTT_ExerciseOfCommonWarrantsNetOfCostsShares_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_ExerciseOfCommonWarrantsNetOfCostsShares_lbl" xml:lang="en-US">Exercise of common warrants, net of costs, shares</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_StockIssuedDuringPeriodValueNewIssuesOne" xlink:label="OPTT_StockIssuedDuringPeriodValueNewIssuesOne" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_StockIssuedDuringPeriodValueNewIssuesOne" xlink:to="OPTT_StockIssuedDuringPeriodValueNewIssuesOne_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_StockIssuedDuringPeriodValueNewIssuesOne_lbl" xml:lang="en-US">Issuance of common stock- Aspire financing, net of issuance costs</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_StockIssuedDuringPeriodSharesNewIssuesOne" xlink:label="OPTT_StockIssuedDuringPeriodSharesNewIssuesOne" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_StockIssuedDuringPeriodSharesNewIssuesOne" xlink:to="OPTT_StockIssuedDuringPeriodSharesNewIssuesOne_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_StockIssuedDuringPeriodSharesNewIssuesOne_lbl" xml:lang="en-US">Issuance of common stock- Aspire financing, net of issuance costs, shares</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueOther" xlink:label="us-gaap_StockIssuedDuringPeriodValueOther" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodValueOther" xlink:to="us-gaap_StockIssuedDuringPeriodValueOther_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockIssuedDuringPeriodValueOther_lbl" xml:lang="en-US">Issuance of common stock- AGP At The Market offering, net of issuance costs</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesOther" xlink:label="us-gaap_StockIssuedDuringPeriodSharesOther" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodSharesOther" xlink:to="us-gaap_StockIssuedDuringPeriodSharesOther_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockIssuedDuringPeriodSharesOther_lbl" xml:lang="en-US">Issuance of common stock- AGP At The Market offering, net of issuance costs, shares</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TreasuryStockValueAcquiredCostMethod" xlink:label="us-gaap_TreasuryStockValueAcquiredCostMethod" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_TreasuryStockValueAcquiredCostMethod" xlink:to="us-gaap_TreasuryStockValueAcquiredCostMethod_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_TreasuryStockValueAcquiredCostMethod_lbl" xml:lang="en-US">Acquisition of treasury stock</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TreasuryStockSharesAcquired" xlink:label="us-gaap_TreasuryStockSharesAcquired" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_TreasuryStockSharesAcquired" xlink:to="us-gaap_TreasuryStockSharesAcquired_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_TreasuryStockSharesAcquired_lbl" xml:lang="en-US">Acquisition of treasury stock, shares</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueAcquisitions" xlink:label="us-gaap_StockIssuedDuringPeriodValueAcquisitions" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodValueAcquisitions" xlink:to="us-gaap_StockIssuedDuringPeriodValueAcquisitions_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockIssuedDuringPeriodValueAcquisitions_lbl" xml:lang="en-US">Issuance of shares for acquisition</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesAcquisitions" xlink:label="us-gaap_StockIssuedDuringPeriodSharesAcquisitions" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodSharesAcquisitions" xlink:to="us-gaap_StockIssuedDuringPeriodSharesAcquisitions_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockIssuedDuringPeriodSharesAcquisitions_lbl" xml:lang="en-US">Issuance of shares in acquisition, shares</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax" xlink:label="us-gaap_OtherComprehensiveIncomeLossNetOfTax" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OtherComprehensiveIncomeLossNetOfTax" xlink:to="us-gaap_OtherComprehensiveIncomeLossNetOfTax_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OtherComprehensiveIncomeLossNetOfTax_lbl" xml:lang="en-US">Other comprehensive gain/(loss)</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockholdersEquity" xlink:to="us-gaap_StockholdersEquity_3_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="us-gaap_StockholdersEquity_3_lbl" xml:lang="en-US">Ending Balances</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SharesOutstanding" xlink:to="us-gaap_SharesOutstanding_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="us-gaap_SharesOutstanding_2_lbl" xml:lang="en-US">Ending balance, shares</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementOfCashFlowsAbstract" xlink:label="us-gaap_StatementOfCashFlowsAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StatementOfCashFlowsAbstract" xlink:to="us-gaap_StatementOfCashFlowsAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StatementOfCashFlowsAbstract_lbl" xml:lang="en-US">Statement of Cash Flows [Abstract]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_lbl" xml:lang="en-US">Cash flows from operating activities:</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_lbl" xml:lang="en-US">Adjustments to reconcile net loss to net cash used in operating activities:</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ForeignCurrencyTransactionGainLossBeforeTax" xlink:to="us-gaap_ForeignCurrencyTransactionGainLossBeforeTax_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_ForeignCurrencyTransactionGainLossBeforeTax_2_lbl" xml:lang="en-US">Foreign exchange loss (gain)</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DepreciationDepletionAndAmortization" xlink:label="us-gaap_DepreciationDepletionAndAmortization" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DepreciationDepletionAndAmortization" xlink:to="us-gaap_DepreciationDepletionAndAmortization_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DepreciationDepletionAndAmortization_lbl" xml:lang="en-US">Depreciation of fixed assets</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AmortizationOfIntangibleAssets" xlink:label="us-gaap_AmortizationOfIntangibleAssets" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AmortizationOfIntangibleAssets" xlink:to="us-gaap_AmortizationOfIntangibleAssets_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AmortizationOfIntangibleAssets_lbl" xml:lang="en-US">Amortization of intangible assets</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingLeaseRightOfUseAssetAmortizationExpense" xlink:label="us-gaap_OperatingLeaseRightOfUseAssetAmortizationExpense" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingLeaseRightOfUseAssetAmortizationExpense" xlink:to="us-gaap_OperatingLeaseRightOfUseAssetAmortizationExpense_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OperatingLeaseRightOfUseAssetAmortizationExpense_lbl" xml:lang="en-US">Amortization of right of use asset</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GainLossOnSaleOfPropertyPlantEquipment" xlink:label="us-gaap_GainLossOnSaleOfPropertyPlantEquipment" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_GainLossOnSaleOfPropertyPlantEquipment" xlink:to="us-gaap_GainLossOnSaleOfPropertyPlantEquipment_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_GainLossOnSaleOfPropertyPlantEquipment_lbl" xml:lang="en-US">Loss on disposal of property, plant and equipment</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_GainsLossesOnExtinguishmentOfDebt" xlink:to="us-gaap_GainsLossesOnExtinguishmentOfDebt_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_GainsLossesOnExtinguishmentOfDebt_2_lbl" xml:lang="en-US">Gain on extinguishment of PPP Loan</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensation" xlink:label="us-gaap_ShareBasedCompensation" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensation" xlink:to="us-gaap_ShareBasedCompensation_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensation_lbl" xml:lang="en-US">Stock-based compensation</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_ChangeInFairValueOfContigentLiability" xlink:label="OPTT_ChangeInFairValueOfContigentLiability" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_ChangeInFairValueOfContigentLiability" xlink:to="OPTT_ChangeInFairValueOfContigentLiability_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="OPTT_ChangeInFairValueOfContigentLiability_lbl" xml:lang="en-US">Change in fair value of contingent liability</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:label="us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:to="us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_lbl" xml:lang="en-US">Changes in operating assets and liabilities, net of acquisition:</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsReceivable" xlink:label="us-gaap_IncreaseDecreaseInAccountsReceivable" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInAccountsReceivable" xlink:to="us-gaap_IncreaseDecreaseInAccountsReceivable_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_IncreaseDecreaseInAccountsReceivable_lbl" xml:lang="en-US">Accounts receivable</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInContractWithCustomerAsset" xlink:label="us-gaap_IncreaseDecreaseInContractWithCustomerAsset" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInContractWithCustomerAsset" xlink:to="us-gaap_IncreaseDecreaseInContractWithCustomerAsset_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_IncreaseDecreaseInContractWithCustomerAsset_lbl" xml:lang="en-US">Contract assets</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInInventories" xlink:label="us-gaap_IncreaseDecreaseInInventories" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInInventories" xlink:to="us-gaap_IncreaseDecreaseInInventories_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_IncreaseDecreaseInInventories_lbl" xml:lang="en-US">Inventory</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInOtherOperatingAssets" xlink:label="us-gaap_IncreaseDecreaseInOtherOperatingAssets" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInOtherOperatingAssets" xlink:to="us-gaap_IncreaseDecreaseInOtherOperatingAssets_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_IncreaseDecreaseInOtherOperatingAssets_lbl" xml:lang="en-US">Other assets</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsPayable" xlink:label="us-gaap_IncreaseDecreaseInAccountsPayable" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInAccountsPayable" xlink:to="us-gaap_IncreaseDecreaseInAccountsPayable_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_IncreaseDecreaseInAccountsPayable_lbl" xml:lang="en-US">Accounts payable</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInAccruedLiabilities" xlink:label="us-gaap_IncreaseDecreaseInAccruedLiabilities" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInAccruedLiabilities" xlink:to="us-gaap_IncreaseDecreaseInAccruedLiabilities_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_IncreaseDecreaseInAccruedLiabilities_lbl" xml:lang="en-US">Accrued expenses</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_IncreaseDecreaseInLeaseLiability" xlink:label="OPTT_IncreaseDecreaseInLeaseLiability" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_IncreaseDecreaseInLeaseLiability" xlink:to="OPTT_IncreaseDecreaseInLeaseLiability_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_IncreaseDecreaseInLeaseLiability_lbl" xml:lang="en-US">Change in lease liability</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInContractWithCustomerLiability" xlink:label="us-gaap_IncreaseDecreaseInContractWithCustomerLiability" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInContractWithCustomerLiability" xlink:to="us-gaap_IncreaseDecreaseInContractWithCustomerLiability_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_IncreaseDecreaseInContractWithCustomerLiability_lbl" xml:lang="en-US">Contract liabilities</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_IncreaseDecreaseInLitigationPayable" xlink:label="OPTT_IncreaseDecreaseInLitigationPayable" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_IncreaseDecreaseInLitigationPayable" xlink:to="OPTT_IncreaseDecreaseInLitigationPayable_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="OPTT_IncreaseDecreaseInLitigationPayable_lbl" xml:lang="en-US">Litigation payable</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivities" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:to="us-gaap_NetCashProvidedByUsedInOperatingActivities_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivities_lbl" xml:lang="en-US">Net cash used in operating activities</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:to="us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_lbl" xml:lang="en-US">Cash flows from investing activities:</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaymentsToAcquireProductiveAssets" xlink:label="us-gaap_PaymentsToAcquireProductiveAssets" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PaymentsToAcquireProductiveAssets" xlink:to="us-gaap_PaymentsToAcquireProductiveAssets_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_PaymentsToAcquireProductiveAssets_lbl" xml:lang="en-US">Purchase of property, plant and equipment</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired" xlink:label="us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired" xlink:to="us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_lbl" xml:lang="en-US">Payments for MAR acquisition, net of cash acquired</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivities" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:to="us-gaap_NetCashProvidedByUsedInInvestingActivities_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivities_lbl" xml:lang="en-US">Net cash used in investing activities</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:to="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_lbl" xml:lang="en-US">Cash flows from financing activities:</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProceedsFromIssuanceOfLongTermDebt" xlink:label="us-gaap_ProceedsFromIssuanceOfLongTermDebt" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ProceedsFromIssuanceOfLongTermDebt" xlink:to="us-gaap_ProceedsFromIssuanceOfLongTermDebt_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ProceedsFromIssuanceOfLongTermDebt_lbl" xml:lang="en-US">Proceeds from Paycheck Protection Program Loan</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProceedsFromConstructionLoansPayable" xlink:label="us-gaap_ProceedsFromConstructionLoansPayable" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ProceedsFromConstructionLoansPayable" xlink:to="us-gaap_ProceedsFromConstructionLoansPayable_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ProceedsFromConstructionLoansPayable_lbl" xml:lang="en-US">Proceeds from loan payable</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RepaymentsOfDebt" xlink:label="us-gaap_RepaymentsOfDebt" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RepaymentsOfDebt" xlink:to="us-gaap_RepaymentsOfDebt_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_RepaymentsOfDebt_lbl" xml:lang="en-US">Payments of loan payable</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProceedsFromStockOptionsExercised" xlink:label="us-gaap_ProceedsFromStockOptionsExercised" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ProceedsFromStockOptionsExercised" xlink:to="us-gaap_ProceedsFromStockOptionsExercised_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ProceedsFromStockOptionsExercised_lbl" xml:lang="en-US">Proceeds from stock option exercises</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProceedsFromIssuanceOfCommonStock" xlink:label="us-gaap_ProceedsFromIssuanceOfCommonStock" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ProceedsFromIssuanceOfCommonStock" xlink:to="us-gaap_ProceedsFromIssuanceOfCommonStock_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ProceedsFromIssuanceOfCommonStock_lbl" xml:lang="en-US">Proceeds from issuance of common stock- Aspire financing net of issuance costs</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProceedsFromIssuanceInitialPublicOffering" xlink:label="us-gaap_ProceedsFromIssuanceInitialPublicOffering" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ProceedsFromIssuanceInitialPublicOffering" xlink:to="us-gaap_ProceedsFromIssuanceInitialPublicOffering_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ProceedsFromIssuanceInitialPublicOffering_lbl" xml:lang="en-US">Proceeds from issuance of common stock- AGP At The Market offering, net of issuance costs</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProceedsFromWarrantExercises" xlink:label="us-gaap_ProceedsFromWarrantExercises" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ProceedsFromWarrantExercises" xlink:to="us-gaap_ProceedsFromWarrantExercises_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ProceedsFromWarrantExercises_lbl" xml:lang="en-US">Proceeds associated with exercise of common stock warrants</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaymentsForRepurchaseOfCommonStock" xlink:label="us-gaap_PaymentsForRepurchaseOfCommonStock" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PaymentsForRepurchaseOfCommonStock" xlink:to="us-gaap_PaymentsForRepurchaseOfCommonStock_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_PaymentsForRepurchaseOfCommonStock_lbl" xml:lang="en-US">Acquisition of treasury stock</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivities" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:to="us-gaap_NetCashProvidedByUsedInFinancingActivities_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivities_lbl" xml:lang="en-US">Net cash provided by financing activities</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:label="us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:to="us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_lbl" xml:lang="en-US">Effect of exchange rate changes on cash, cash equivalents and restricted cash</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect" xlink:to="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_lbl" xml:lang="en-US">Net (decrease) / increase in cash, cash equivalents and restricted cash</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations" xlink:to="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations_lbl" xml:lang="en-US">Cash, cash equivalents and restricted cash, beginning of period</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations" xlink:to="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations_2_lbl" xml:lang="en-US">Cash, cash equivalents and restricted cash, end of period</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SupplementalCashFlowElementsAbstract" xlink:label="us-gaap_SupplementalCashFlowElementsAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SupplementalCashFlowElementsAbstract" xlink:to="us-gaap_SupplementalCashFlowElementsAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SupplementalCashFlowElementsAbstract_lbl" xml:lang="en-US">Supplemental disclosure of noncash operating activities:</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_PrepaidFinancingCostsReportedInAccruedExpenses" xlink:label="OPTT_PrepaidFinancingCostsReportedInAccruedExpenses" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_PrepaidFinancingCostsReportedInAccruedExpenses" xlink:to="OPTT_PrepaidFinancingCostsReportedInAccruedExpenses_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_PrepaidFinancingCostsReportedInAccruedExpenses_lbl" xml:lang="en-US">Prepaid financing costs reported in accrued expenses</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_NonCashOperatingAndInvestingActivitiesAbstract" xlink:label="OPTT_NonCashOperatingAndInvestingActivitiesAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_NonCashOperatingAndInvestingActivitiesAbstract" xlink:to="OPTT_NonCashOperatingAndInvestingActivitiesAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_NonCashOperatingAndInvestingActivitiesAbstract_lbl" xml:lang="en-US">Supplemental disclosure of noncash investing and financing activities:</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_AcquisitionOfPropertyPlantAndEquipmentThroughAccountsPayable" xlink:label="OPTT_AcquisitionOfPropertyPlantAndEquipmentThroughAccountsPayable" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_AcquisitionOfPropertyPlantAndEquipmentThroughAccountsPayable" xlink:to="OPTT_AcquisitionOfPropertyPlantAndEquipmentThroughAccountsPayable_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_AcquisitionOfPropertyPlantAndEquipmentThroughAccountsPayable_lbl" xml:lang="en-US">Acquisition of property, plant and equipment through accounts payable</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_IssuanceOfCommonStockInAcquisition" xlink:label="OPTT_IssuanceOfCommonStockInAcquisition" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_IssuanceOfCommonStockInAcquisition" xlink:to="OPTT_IssuanceOfCommonStockInAcquisition_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_IssuanceOfCommonStockInAcquisition_lbl" xml:lang="en-US">Issuance of common stock in acquisition of MAR</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_AdvancePayable" xlink:label="OPTT_AdvancePayable" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_AdvancePayable" xlink:to="OPTT_AdvancePayable_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_AdvancePayable_lbl" xml:lang="en-US">Advance payable &#8211; MAR</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_ContingentLiability" xlink:label="OPTT_ContingentLiability" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_ContingentLiability" xlink:to="OPTT_ContingentLiability_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_ContingentLiability_lbl" xml:lang="en-US">Contingent liability</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_OutstandingReceivableForSaleOfSharesFromWarrantExercises" xlink:label="OPTT_OutstandingReceivableForSaleOfSharesFromWarrantExercises" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_OutstandingReceivableForSaleOfSharesFromWarrantExercises" xlink:to="OPTT_OutstandingReceivableForSaleOfSharesFromWarrantExercises_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_OutstandingReceivableForSaleOfSharesFromWarrantExercises_lbl" xml:lang="en-US">Outstanding receivable for sale of shares from warrant exercises</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_OutstandingReceivableForSaleOfSharesFromStockOptionExercises" xlink:label="OPTT_OutstandingReceivableForSaleOfSharesFromStockOptionExercises" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_OutstandingReceivableForSaleOfSharesFromStockOptionExercises" xlink:to="OPTT_OutstandingReceivableForSaleOfSharesFromStockOptionExercises_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_OutstandingReceivableForSaleOfSharesFromStockOptionExercises_lbl" xml:lang="en-US">Outstanding receivable for sale of shares from stock option exercises</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract" xlink:label="us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract" xlink:to="us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_lbl" xml:lang="en-US">Organization, Consolidation and Presentation of Financial Statements [Abstract]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessDescriptionAndBasisOfPresentationTextBlock" xlink:label="us-gaap_BusinessDescriptionAndBasisOfPresentationTextBlock" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_BusinessDescriptionAndBasisOfPresentationTextBlock" xlink:to="us-gaap_BusinessDescriptionAndBasisOfPresentationTextBlock_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_BusinessDescriptionAndBasisOfPresentationTextBlock_lbl" xml:lang="en-US">Background, Basis of Presentation and Liquidity</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccountingPoliciesAbstract" xlink:label="us-gaap_AccountingPoliciesAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AccountingPoliciesAbstract" xlink:to="us-gaap_AccountingPoliciesAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AccountingPoliciesAbstract_lbl" xml:lang="en-US">Accounting Policies [Abstract]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SignificantAccountingPoliciesTextBlock" xlink:label="us-gaap_SignificantAccountingPoliciesTextBlock" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SignificantAccountingPoliciesTextBlock" xlink:to="us-gaap_SignificantAccountingPoliciesTextBlock_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SignificantAccountingPoliciesTextBlock_lbl" xml:lang="en-US">Summary of Significant Accounting Policies</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_DisclosureAccountReceivableAndContractAssetsAbstract" xlink:label="OPTT_DisclosureAccountReceivableAndContractAssetsAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_DisclosureAccountReceivableAndContractAssetsAbstract" xlink:to="OPTT_DisclosureAccountReceivableAndContractAssetsAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_DisclosureAccountReceivableAndContractAssetsAbstract_lbl" xml:lang="en-US">Account Receivable And Contract Assets</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_AccountReceivableContractAssetsAndContractLiabilitiesTextBlock" xlink:label="OPTT_AccountReceivableContractAssetsAndContractLiabilitiesTextBlock" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_AccountReceivableContractAssetsAndContractLiabilitiesTextBlock" xlink:to="OPTT_AccountReceivableContractAssetsAndContractLiabilitiesTextBlock_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_AccountReceivableContractAssetsAndContractLiabilitiesTextBlock_lbl" xml:lang="en-US">Account Receivable and Contract Assets</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredCostsCapitalizedPrepaidAndOtherAssetsDisclosureAbstract" xlink:label="us-gaap_DeferredCostsCapitalizedPrepaidAndOtherAssetsDisclosureAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DeferredCostsCapitalizedPrepaidAndOtherAssetsDisclosureAbstract" xlink:to="us-gaap_DeferredCostsCapitalizedPrepaidAndOtherAssetsDisclosureAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DeferredCostsCapitalizedPrepaidAndOtherAssetsDisclosureAbstract_lbl" xml:lang="en-US">Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherCurrentAssetsTextBlock" xlink:label="us-gaap_OtherCurrentAssetsTextBlock" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OtherCurrentAssetsTextBlock" xlink:to="us-gaap_OtherCurrentAssetsTextBlock_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OtherCurrentAssetsTextBlock_lbl" xml:lang="en-US">Other Current Assets</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentAbstract" xlink:label="us-gaap_PropertyPlantAndEquipmentAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PropertyPlantAndEquipmentAbstract" xlink:to="us-gaap_PropertyPlantAndEquipmentAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PropertyPlantAndEquipmentAbstract_lbl" xml:lang="en-US">Property, Plant and Equipment [Abstract]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock" xlink:label="us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock" xlink:to="us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock_lbl" xlink:type="arc" />
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_lbl" xml:lang="en-US">Recently Issued Accounting Standards</link:label>
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      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfRestrictedCashAndCashEquivalentsTextBlock" xlink:label="us-gaap_ScheduleOfRestrictedCashAndCashEquivalentsTextBlock" />
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ScheduleOfRevenueByMajorCustomersByReportingSegmentsTableTextBlock_lbl" xml:lang="en-US">Schedule of Revenue by Major Customers by Reporting Segments</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock" xlink:label="us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock" xlink:to="us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock_lbl" xml:lang="en-US">Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_ScheduleOfAccountsReceivableContractAssetsAndContractLiabilitiesTableTextBlock" xlink:label="OPTT_ScheduleOfAccountsReceivableContractAssetsAndContractLiabilitiesTableTextBlock" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_ScheduleOfAccountsReceivableContractAssetsAndContractLiabilitiesTableTextBlock" xlink:to="OPTT_ScheduleOfAccountsReceivableContractAssetsAndContractLiabilitiesTableTextBlock_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_ScheduleOfAccountsReceivableContractAssetsAndContractLiabilitiesTableTextBlock_lbl" xml:lang="en-US">Schedule of Accounts Receivable, Contract Assets and Contract Liabilities</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ContractWithCustomerAssetAndLiabilityTableTextBlock" xlink:label="us-gaap_ContractWithCustomerAssetAndLiabilityTableTextBlock" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ContractWithCustomerAssetAndLiabilityTableTextBlock" xlink:to="us-gaap_ContractWithCustomerAssetAndLiabilityTableTextBlock_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ContractWithCustomerAssetAndLiabilityTableTextBlock_lbl" xml:lang="en-US">Schedule of Significant Changes in Contract Assets and Contract Liabilities</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfOtherCurrentAssetsTableTextBlock" xlink:label="us-gaap_ScheduleOfOtherCurrentAssetsTableTextBlock" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleOfOtherCurrentAssetsTableTextBlock" xlink:to="us-gaap_ScheduleOfOtherCurrentAssetsTableTextBlock_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ScheduleOfOtherCurrentAssetsTableTextBlock_lbl" xml:lang="en-US">Schedule of Other Current Assets</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTextBlock" xlink:label="us-gaap_PropertyPlantAndEquipmentTextBlock" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PropertyPlantAndEquipmentTextBlock" xlink:to="us-gaap_PropertyPlantAndEquipmentTextBlock_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PropertyPlantAndEquipmentTextBlock_lbl" xml:lang="en-US">Schedule of Components of Property and Equipment</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LeaseCostTableTextBlock" xlink:label="us-gaap_LeaseCostTableTextBlock" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LeaseCostTableTextBlock" xlink:to="us-gaap_LeaseCostTableTextBlock_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LeaseCostTableTextBlock_lbl" xml:lang="en-US">Schedule of Operating Lease Costs</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_ScheduleOfRightofUseAssetsAndLeaseLiabilitiesTableTextBlock" xlink:label="OPTT_ScheduleOfRightofUseAssetsAndLeaseLiabilitiesTableTextBlock" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_ScheduleOfRightofUseAssetsAndLeaseLiabilitiesTableTextBlock" xlink:to="OPTT_ScheduleOfRightofUseAssetsAndLeaseLiabilitiesTableTextBlock_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_ScheduleOfRightofUseAssetsAndLeaseLiabilitiesTableTextBlock_lbl" xml:lang="en-US">Schedule of Right-of Use Assets and Lease Liabilities</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock" xlink:to="us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock_lbl" xml:lang="en-US">Schedule of Future Minimum Lease Payments Under Operating Lease</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfAccruedLiabilitiesTableTextBlock" xlink:label="us-gaap_ScheduleOfAccruedLiabilitiesTableTextBlock" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleOfAccruedLiabilitiesTableTextBlock" xlink:to="us-gaap_ScheduleOfAccruedLiabilitiesTableTextBlock_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ScheduleOfAccruedLiabilitiesTableTextBlock_lbl" xml:lang="en-US">Schedule of Accrued Expenses</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:to="us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_lbl" xml:lang="en-US">Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_lbl" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award [Line Items]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfAssumptionsUsedTableTextBlock" xlink:label="us-gaap_ScheduleOfAssumptionsUsedTableTextBlock" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleOfAssumptionsUsedTableTextBlock" xlink:to="us-gaap_ScheduleOfAssumptionsUsedTableTextBlock_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ScheduleOfAssumptionsUsedTableTextBlock_lbl" xml:lang="en-US">Schedule of Valuation Assumptions</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationActivityTableTextBlock" xlink:label="us-gaap_ScheduleOfShareBasedCompensationActivityTableTextBlock" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleOfShareBasedCompensationActivityTableTextBlock" xlink:to="us-gaap_ScheduleOfShareBasedCompensationActivityTableTextBlock_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ScheduleOfShareBasedCompensationActivityTableTextBlock_lbl" xml:lang="en-US">Schedule of Stock Option Activity</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_ScheduleOfBusinessAcquisitionAndFairValueOfNetAssetsCompensationExpenseRecognized" xlink:label="OPTT_ScheduleOfBusinessAcquisitionAndFairValueOfNetAssetsCompensationExpenseRecognized" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_ScheduleOfBusinessAcquisitionAndFairValueOfNetAssetsCompensationExpenseRecognized" xlink:to="OPTT_ScheduleOfBusinessAcquisitionAndFairValueOfNetAssetsCompensationExpenseRecognized_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_ScheduleOfBusinessAcquisitionAndFairValueOfNetAssetsCompensationExpenseRecognized_lbl" xml:lang="en-US">Schedule of Business Acquisition and Fair Value of Net Assets, Compensation Expense Recognized</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityTableTextBlock" xlink:label="us-gaap_ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityTableTextBlock" />
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityTableTextBlock_lbl" xml:lang="en-US">Schedule of Non-vested Restricted Stock Activity</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionTableTextBlock" xlink:label="OPTT_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionTableTextBlock" />
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      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionContingentConsiderationTextBlock" xlink:label="us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionContingentConsiderationTextBlock" />
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_NetIncomeLoss_3_lbl" xml:lang="en-US">Net loss</link:label>
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_Cash" xlink:to="us-gaap_Cash_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_Cash_lbl" xml:lang="en-US">Cash</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ProceedsFromIssuanceInitialPublicOffering" xlink:to="us-gaap_ProceedsFromIssuanceInitialPublicOffering_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_ProceedsFromIssuanceInitialPublicOffering_2_lbl" xml:lang="en-US">Proceeds from initial public offering</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction" xlink:label="us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction" />
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      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SaleOfStockConsiderationReceivedPerTransaction" xlink:label="us-gaap_SaleOfStockConsiderationReceivedPerTransaction" />
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SaleOfStockConsiderationReceivedPerTransaction_lbl" xml:lang="en-US">Proceeds from issuance or sale of equity, net of issuance costs</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SaleOfStockPricePerShare" xlink:label="us-gaap_SaleOfStockPricePerShare" />
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SaleOfStockPricePerShare_lbl" xml:lang="en-US">Combined purchase price per share</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_PaymentOfSalesCommission" xlink:label="OPTT_PaymentOfSalesCommission" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_PaymentOfSalesCommission" xlink:to="OPTT_PaymentOfSalesCommission_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_PaymentOfSalesCommission_lbl" xml:lang="en-US">Payment of sales commission</link:label>
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DeferredOfferingCosts_lbl" xml:lang="en-US">Deferred Offering Costs</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_ProceedsFromInitialPublicOffering" xlink:label="OPTT_ProceedsFromInitialPublicOffering" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_ProceedsFromInitialPublicOffering" xlink:to="OPTT_ProceedsFromInitialPublicOffering_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_ProceedsFromInitialPublicOffering_lbl" xml:lang="en-US">Proceeds from initial public offering</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_StockIssuedDuringPeriodValueIssuedForCommitmentFee" xlink:label="OPTT_StockIssuedDuringPeriodValueIssuedForCommitmentFee" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_StockIssuedDuringPeriodValueIssuedForCommitmentFee" xlink:to="OPTT_StockIssuedDuringPeriodValueIssuedForCommitmentFee_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_StockIssuedDuringPeriodValueIssuedForCommitmentFee_lbl" xml:lang="en-US">Aggregate purchase of common stock</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_PercentageOfOutstandingCommonStockLimitForShareholderApproval" xlink:label="OPTT_PercentageOfOutstandingCommonStockLimitForShareholderApproval" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_PercentageOfOutstandingCommonStockLimitForShareholderApproval" xlink:to="OPTT_PercentageOfOutstandingCommonStockLimitForShareholderApproval_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_PercentageOfOutstandingCommonStockLimitForShareholderApproval_lbl" xml:lang="en-US">Percentage of outstanding common stock</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_StockIssuedDuringPeriodSharesCanBeIssuedBasedUponOutstandingPercentage" xlink:label="OPTT_StockIssuedDuringPeriodSharesCanBeIssuedBasedUponOutstandingPercentage" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_StockIssuedDuringPeriodSharesCanBeIssuedBasedUponOutstandingPercentage" xlink:to="OPTT_StockIssuedDuringPeriodSharesCanBeIssuedBasedUponOutstandingPercentage_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_StockIssuedDuringPeriodSharesCanBeIssuedBasedUponOutstandingPercentage_lbl" xml:lang="en-US">Shares can be issued based upon outstanding percentage</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_NumberOfAdditionalSharesThatCanBeIssuedUponShareholderApproval" xlink:label="OPTT_NumberOfAdditionalSharesThatCanBeIssuedUponShareholderApproval" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_NumberOfAdditionalSharesThatCanBeIssuedUponShareholderApproval" xlink:to="OPTT_NumberOfAdditionalSharesThatCanBeIssuedUponShareholderApproval_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_NumberOfAdditionalSharesThatCanBeIssuedUponShareholderApproval_lbl" xml:lang="en-US">Additional sales of common stock shares sold</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfCashAndCashEquivalentsTable" xlink:label="us-gaap_ScheduleOfCashAndCashEquivalentsTable" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleOfCashAndCashEquivalentsTable" xlink:to="us-gaap_ScheduleOfCashAndCashEquivalentsTable_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ScheduleOfCashAndCashEquivalentsTable_lbl" xml:lang="en-US">Schedule of Cash and Cash Equivalents [Table]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CashAndCashEquivalentsLineItems" xlink:label="us-gaap_CashAndCashEquivalentsLineItems" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CashAndCashEquivalentsLineItems" xlink:to="us-gaap_CashAndCashEquivalentsLineItems_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CashAndCashEquivalentsLineItems_lbl" xml:lang="en-US">Cash and Cash Equivalents [Line Items]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RestrictedCashCurrent" xlink:to="us-gaap_RestrictedCashCurrent_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_RestrictedCashCurrent_2_lbl" xml:lang="en-US">Restricted cash- short term</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RestrictedCashNoncurrent" xlink:to="us-gaap_RestrictedCashNoncurrent_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_RestrictedCashNoncurrent_2_lbl" xml:lang="en-US">Restricted cash- long term</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:to="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_lbl" xml:lang="en-US">Cash, cash equivalents and restricted cash</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfProductInformationTable" xlink:label="us-gaap_ScheduleOfProductInformationTable" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleOfProductInformationTable" xlink:to="us-gaap_ScheduleOfProductInformationTable_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ScheduleOfProductInformationTable_lbl" xml:lang="en-US">Schedule of Product Information [Table]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProductInformationLineItems" xlink:label="us-gaap_ProductInformationLineItems" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ProductInformationLineItems" xlink:to="us-gaap_ProductInformationLineItems_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ProductInformationLineItems_lbl" xml:lang="en-US">Product Information [Line Items]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensation" xlink:to="us-gaap_ShareBasedCompensation_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_ShareBasedCompensation_2_lbl" xml:lang="en-US">Total share-based compensation expense</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsTable" xlink:label="us-gaap_ScheduleOfCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsTable" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleOfCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsTable" xlink:to="us-gaap_ScheduleOfCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsTable_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ScheduleOfCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsTable_lbl" xml:lang="en-US">Collaborative Arrangement and Arrangement Other than Collaborative [Table]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems" xlink:label="us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems" xlink:to="us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems_lbl" xml:lang="en-US">Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Deposits" xlink:label="us-gaap_Deposits" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_Deposits" xlink:to="us-gaap_Deposits_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_Deposits_lbl" xml:lang="en-US">Deposits</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LettersOfCreditOutstandingAmount" xlink:label="us-gaap_LettersOfCreditOutstandingAmount" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LettersOfCreditOutstandingAmount" xlink:to="us-gaap_LettersOfCreditOutstandingAmount_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LettersOfCreditOutstandingAmount_lbl" xml:lang="en-US">Letters of Credit Outstanding, Amount</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_LettersOfCreditIssuedAmount" xlink:label="OPTT_LettersOfCreditIssuedAmount" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_LettersOfCreditIssuedAmount" xlink:to="OPTT_LettersOfCreditIssuedAmount_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_LettersOfCreditIssuedAmount_lbl" xml:lang="en-US">Letters of credit issued amount</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:to="us-gaap_CashAndCashEquivalentsAtCarryingValue_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_CashAndCashEquivalentsAtCarryingValue_2_lbl" xml:lang="en-US">Cash and Cash Equivalents, at Carrying Value</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligation" xlink:label="us-gaap_RevenueRemainingPerformanceObligation" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RevenueRemainingPerformanceObligation" xlink:to="us-gaap_RevenueRemainingPerformanceObligation_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RevenueRemainingPerformanceObligation_lbl" xml:lang="en-US">Revenue remaining performance obligation</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_RevenueRemainingPerformancesObligationPercentage" xlink:label="OPTT_RevenueRemainingPerformancesObligationPercentage" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_RevenueRemainingPerformancesObligationPercentage" xlink:to="OPTT_RevenueRemainingPerformancesObligationPercentage_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_RevenueRemainingPerformancesObligationPercentage_lbl" xml:lang="en-US">Revenue remaining performance obligation, percentage</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount" xlink:label="us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount" xlink:to="us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_lbl" xml:lang="en-US">Antidilutive securities excluded from computation of earnings per share, amount</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_DisclosureAccountReceivableAndContractAssetsAbstract" xlink:to="OPTT_DisclosureAccountReceivableAndContractAssetsAbstract_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="OPTT_DisclosureAccountReceivableAndContractAssetsAbstract_2_lbl" xml:lang="en-US">Schedule Of Accounts Receivable Contract Assets And Contract Liabilities</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_DisclosureAccountReceivableAndContractAssetsAbstract" xlink:to="OPTT_DisclosureAccountReceivableAndContractAssetsAbstract_3_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="OPTT_DisclosureAccountReceivableAndContractAssetsAbstract_3_lbl" xml:lang="en-US">Schedule Of Significant Changes In Contract Assets And Contract Liabilities</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ContractWithCustomerAssetNet" xlink:label="us-gaap_ContractWithCustomerAssetNet" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ContractWithCustomerAssetNet" xlink:to="us-gaap_ContractWithCustomerAssetNet_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedPeriodStartLabel" xlink:label="us-gaap_ContractWithCustomerAssetNet_lbl" xml:lang="en-US">Transferred to receivables from contract assets recognized at the beginning of the period</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ContractWithCustomerAssetNet" xlink:to="us-gaap_ContractWithCustomerAssetNet_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="us-gaap_ContractWithCustomerAssetNet_2_lbl" xml:lang="en-US">Revenue recognized and not billed as of the end of the period</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInContractWithCustomerAsset" xlink:to="us-gaap_IncreaseDecreaseInContractWithCustomerAsset_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_IncreaseDecreaseInContractWithCustomerAsset_2_lbl" xml:lang="en-US">Net change in contract assets</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PrepaidInsurance" xlink:label="us-gaap_PrepaidInsurance" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PrepaidInsurance" xlink:to="us-gaap_PrepaidInsurance_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PrepaidInsurance_lbl" xml:lang="en-US">Prepaid insurance</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_PrepaidSoftwareAndLicenses" xlink:label="OPTT_PrepaidSoftwareAndLicenses" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_PrepaidSoftwareAndLicenses" xlink:to="OPTT_PrepaidSoftwareAndLicenses_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_PrepaidSoftwareAndLicenses_lbl" xml:lang="en-US">Prepaid software &amp; licenses</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_PrepaidSalesAndMarketing" xlink:label="OPTT_PrepaidSalesAndMarketing" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_PrepaidSalesAndMarketing" xlink:to="OPTT_PrepaidSalesAndMarketing_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_PrepaidSalesAndMarketing_lbl" xml:lang="en-US">Prepaid sales and marketing</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_PrepaidRecruitingAndHR" xlink:label="OPTT_PrepaidRecruitingAndHR" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_PrepaidRecruitingAndHR" xlink:to="OPTT_PrepaidRecruitingAndHR_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_PrepaidRecruitingAndHR_lbl" xml:lang="en-US">Prepaid recruiting</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherReceivablesNetCurrent" xlink:label="us-gaap_OtherReceivablesNetCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OtherReceivablesNetCurrent" xlink:to="us-gaap_OtherReceivablesNetCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OtherReceivablesNetCurrent_lbl" xml:lang="en-US">Other receivables</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DepositsAssetsCurrent" xlink:label="us-gaap_DepositsAssetsCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DepositsAssetsCurrent" xlink:to="us-gaap_DepositsAssetsCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_DepositsAssetsCurrent_lbl" xml:lang="en-US">Deposits</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherPrepaidExpenseCurrent" xlink:label="us-gaap_OtherPrepaidExpenseCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OtherPrepaidExpenseCurrent" xlink:to="us-gaap_OtherPrepaidExpenseCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OtherPrepaidExpenseCurrent_lbl" xml:lang="en-US">Prepaid expenses- other</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OtherAssetsCurrent" xlink:to="us-gaap_OtherAssetsCurrent_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_OtherAssetsCurrent_2_lbl" xml:lang="en-US">Other current assets</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable" xlink:label="us-gaap_ScheduleOfPropertyPlantAndEquipmentTable" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleOfPropertyPlantAndEquipmentTable" xlink:to="us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_lbl" xml:lang="en-US">Property, Plant and Equipment [Table]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentLineItems" xlink:label="us-gaap_PropertyPlantAndEquipmentLineItems" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PropertyPlantAndEquipmentLineItems" xlink:to="us-gaap_PropertyPlantAndEquipmentLineItems_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PropertyPlantAndEquipmentLineItems_lbl" xml:lang="en-US">Property, Plant and Equipment [Line Items]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentGross" xlink:label="us-gaap_PropertyPlantAndEquipmentGross" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PropertyPlantAndEquipmentGross" xlink:to="us-gaap_PropertyPlantAndEquipmentGross_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PropertyPlantAndEquipmentGross_lbl" xml:lang="en-US">Property and equipment, gross</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment" xlink:label="us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment" xlink:to="us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_lbl" xml:lang="en-US">Less: accumulated depreciation</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PropertyPlantAndEquipmentNet" xlink:to="us-gaap_PropertyPlantAndEquipmentNet_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_PropertyPlantAndEquipmentNet_2_lbl" xml:lang="en-US">Property and equipment, net</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Depreciation" xlink:label="us-gaap_Depreciation" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_Depreciation" xlink:to="us-gaap_Depreciation_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_Depreciation_lbl" xml:lang="en-US">Depreciation expense</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_DisclosureLeasesAbstract" xlink:to="OPTT_DisclosureLeasesAbstract_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="OPTT_DisclosureLeasesAbstract_2_lbl" xml:lang="en-US">Schedule Of Operating Lease Costs</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingLeaseCost" xlink:label="us-gaap_OperatingLeaseCost" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingLeaseCost" xlink:to="us-gaap_OperatingLeaseCost_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OperatingLeaseCost_lbl" xml:lang="en-US">Operating lease cost</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShortTermLeaseCost" xlink:label="us-gaap_ShortTermLeaseCost" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShortTermLeaseCost" xlink:to="us-gaap_ShortTermLeaseCost_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShortTermLeaseCost_lbl" xml:lang="en-US">Short-term lease cost</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LeaseCost" xlink:label="us-gaap_LeaseCost" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LeaseCost" xlink:to="us-gaap_LeaseCost_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_LeaseCost_lbl" xml:lang="en-US">Total lease cost</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_DisclosureLeasesAbstract" xlink:to="OPTT_DisclosureLeasesAbstract_3_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="OPTT_DisclosureLeasesAbstract_3_lbl" xml:lang="en-US">Schedule Of Right-of Use Assets And Lease Liabilities</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingLeaseRightOfUseAsset" xlink:to="us-gaap_OperatingLeaseRightOfUseAsset_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_OperatingLeaseRightOfUseAsset_2_lbl" xml:lang="en-US">Operating right-of-use asset, net</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingLeaseLiabilityCurrent" xlink:to="us-gaap_OperatingLeaseLiabilityCurrent_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_OperatingLeaseLiabilityCurrent_2_lbl" xml:lang="en-US">Right-of-use liability- current</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingLeaseLiabilityNoncurrent" xlink:to="us-gaap_OperatingLeaseLiabilityNoncurrent_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_OperatingLeaseLiabilityNoncurrent_2_lbl" xml:lang="en-US">Right-of-use liability- long term</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingLeaseLiability" xlink:label="us-gaap_OperatingLeaseLiability" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingLeaseLiability" xlink:to="us-gaap_OperatingLeaseLiability_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_OperatingLeaseLiability_lbl" xml:lang="en-US">Total lease liability</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1" xlink:label="us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1" xlink:to="us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_lbl" xml:lang="en-US">Weighted average remaining lease term- operating leases</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent" xlink:label="us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent" xlink:to="us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_lbl" xml:lang="en-US">Weighted average discount rate- operating leases</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear" xlink:to="us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_lbl" xml:lang="en-US">Remainder of fiscal year 2022</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths" xlink:to="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_lbl" xml:lang="en-US">2023</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo" xlink:to="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_lbl" xml:lang="en-US">2024</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree" xlink:to="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_lbl" xml:lang="en-US">2025</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue" xlink:to="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_lbl" xml:lang="en-US">Total future minimum lease payments</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount" xlink:to="us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_lbl" xml:lang="en-US">Less imputed interest</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingLeaseLiability" xlink:to="us-gaap_OperatingLeaseLiability_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OperatingLeaseLiability_2_lbl" xml:lang="en-US">Total</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeOperatingLeaseOptionToExtend" xlink:label="us-gaap_LesseeOperatingLeaseOptionToExtend" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LesseeOperatingLeaseOptionToExtend" xlink:to="us-gaap_LesseeOperatingLeaseOptionToExtend_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LesseeOperatingLeaseOptionToExtend_lbl" xml:lang="en-US">Lessee, operating lease, option to extend</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeOperatingLeaseTermOfContract" xlink:label="us-gaap_LesseeOperatingLeaseTermOfContract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LesseeOperatingLeaseTermOfContract" xlink:to="us-gaap_LesseeOperatingLeaseTermOfContract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LesseeOperatingLeaseTermOfContract_lbl" xml:lang="en-US">Lessee, operating lease, term of contract</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LeaseExpirationDate1" xlink:label="us-gaap_LeaseExpirationDate1" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LeaseExpirationDate1" xlink:to="us-gaap_LeaseExpirationDate1_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LeaseExpirationDate1_lbl" xml:lang="en-US">Lease expiration date</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingLeasePayments" xlink:label="us-gaap_OperatingLeasePayments" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingLeasePayments" xlink:to="us-gaap_OperatingLeasePayments_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OperatingLeasePayments_lbl" xml:lang="en-US">Operating lease payments</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConstructionPayableCurrent" xlink:label="us-gaap_ConstructionPayableCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ConstructionPayableCurrent" xlink:to="us-gaap_ConstructionPayableCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ConstructionPayableCurrent_lbl" xml:lang="en-US">Project costs</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LossContingencyAccrualCarryingValueCurrent" xlink:label="us-gaap_LossContingencyAccrualCarryingValueCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LossContingencyAccrualCarryingValueCurrent" xlink:to="us-gaap_LossContingencyAccrualCarryingValueCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LossContingencyAccrualCarryingValueCurrent_lbl" xml:lang="en-US">Contract loss reserve</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherEmployeeRelatedLiabilitiesCurrent" xlink:label="us-gaap_OtherEmployeeRelatedLiabilitiesCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OtherEmployeeRelatedLiabilitiesCurrent" xlink:to="us-gaap_OtherEmployeeRelatedLiabilitiesCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OtherEmployeeRelatedLiabilitiesCurrent_lbl" xml:lang="en-US">Employee incentive payments</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccruedSalariesCurrent" xlink:label="us-gaap_AccruedSalariesCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AccruedSalariesCurrent" xlink:to="us-gaap_AccruedSalariesCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AccruedSalariesCurrent_lbl" xml:lang="en-US">Accrued salary and benefits</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccruedProfessionalFeesCurrent" xlink:label="us-gaap_AccruedProfessionalFeesCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AccruedProfessionalFeesCurrent" xlink:to="us-gaap_AccruedProfessionalFeesCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AccruedProfessionalFeesCurrent_lbl" xml:lang="en-US">Professional fees</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherAccruedLiabilitiesCurrent" xlink:label="us-gaap_OtherAccruedLiabilitiesCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OtherAccruedLiabilitiesCurrent" xlink:to="us-gaap_OtherAccruedLiabilitiesCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OtherAccruedLiabilitiesCurrent_lbl" xml:lang="en-US">Other</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AccruedLiabilitiesCurrent" xlink:to="us-gaap_AccruedLiabilitiesCurrent_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_AccruedLiabilitiesCurrent_2_lbl" xml:lang="en-US">Accrued expenses total&#160;</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights" xlink:label="us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights" xlink:to="us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights_lbl" xml:lang="en-US">Purchase of warrants</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight" xlink:label="us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight" xlink:to="us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight_lbl" xml:lang="en-US">Purchase of common stock warrants</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_CommonStockCombinedPurchasePricePerShare" xlink:label="OPTT_CommonStockCombinedPurchasePricePerShare" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_CommonStockCombinedPurchasePricePerShare" xlink:to="OPTT_CommonStockCombinedPurchasePricePerShare_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_CommonStockCombinedPurchasePricePerShare_lbl" xml:lang="en-US">Common stock combined purchase price per share</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1" xlink:label="us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1" xlink:to="us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_lbl" xml:lang="en-US">Exercise price of warrants</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_WarrantsAndRightsOutstandingTerm" xlink:label="us-gaap_WarrantsAndRightsOutstandingTerm" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_WarrantsAndRightsOutstandingTerm" xlink:to="us-gaap_WarrantsAndRightsOutstandingTerm_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_WarrantsAndRightsOutstandingTerm_lbl" xml:lang="en-US">Warrants and rights outstanding, term</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_NumberOfExercisedWarrants" xlink:label="OPTT_NumberOfExercisedWarrants" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_NumberOfExercisedWarrants" xlink:to="OPTT_NumberOfExercisedWarrants_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_NumberOfExercisedWarrants_lbl" xml:lang="en-US">Number of exercised warrants</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_WarrantsAndRightsOutstandingMaturityDate" xlink:label="us-gaap_WarrantsAndRightsOutstandingMaturityDate" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_WarrantsAndRightsOutstandingMaturityDate" xlink:to="us-gaap_WarrantsAndRightsOutstandingMaturityDate_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_WarrantsAndRightsOutstandingMaturityDate_lbl" xml:lang="en-US">Warrants and Rights Outstanding, Maturity Date</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProceedsFromLoanOriginations1" xlink:label="us-gaap_ProceedsFromLoanOriginations1" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ProceedsFromLoanOriginations1" xlink:to="us-gaap_ProceedsFromLoanOriginations1_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ProceedsFromLoanOriginations1_lbl" xml:lang="en-US">Proceeds from loan originations</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_DebtForgivenessDescription" xlink:label="OPTT_DebtForgivenessDescription" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_DebtForgivenessDescription" xlink:to="OPTT_DebtForgivenessDescription_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_DebtForgivenessDescription_lbl" xml:lang="en-US">Debt forgiveness, description</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="us-gaap_DebtInstrumentInterestRateStatedPercentage" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:to="us-gaap_DebtInstrumentInterestRateStatedPercentage_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DebtInstrumentInterestRateStatedPercentage_lbl" xml:lang="en-US">Debt interest rate</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RepaymentsOfLongTermDebt" xlink:label="us-gaap_RepaymentsOfLongTermDebt" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RepaymentsOfLongTermDebt" xlink:to="us-gaap_RepaymentsOfLongTermDebt_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RepaymentsOfLongTermDebt_lbl" xml:lang="en-US">Repayments of long-term debt</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockSharesOutstanding" xlink:label="us-gaap_CommonStockSharesOutstanding" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommonStockSharesOutstanding" xlink:to="us-gaap_CommonStockSharesOutstanding_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CommonStockSharesOutstanding_lbl" xml:lang="en-US">Common stock, shares outstanding</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_TreasuryStockSharesAcquired" xlink:to="us-gaap_TreasuryStockSharesAcquired_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_TreasuryStockSharesAcquired_2_lbl" xml:lang="en-US">Treasury stock, shares, acquired</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_lbl" xml:lang="en-US">Risk-free interest rate</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_lbl" xml:lang="en-US">Expected dividend yield</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1" xlink:to="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_lbl" xml:lang="en-US">Expected life (in years)</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_lbl" xml:lang="en-US">Expected volatility</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_lbl" xml:lang="en-US">Shares Underlying Options Outstanding, Beginning</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_lbl" xml:lang="en-US">Weighted Average Exercise Price, Beginning Balance</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2" xlink:to="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_lbl" xml:lang="en-US">Weighted Average Remaining Contractual Term (In Years), Beginning</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_lbl" xml:lang="en-US">Shares Underlying Options Outstanding, Granted</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice" xlink:to="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_lbl" xml:lang="en-US">Weighted Average Exercise Price, Granted</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised" xlink:to="us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_2_lbl" xml:lang="en-US">Shares Underlying Options Outstanding, Exercised</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice" xlink:to="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_lbl" xml:lang="en-US">Weighted Average Exercise Price, Exercised</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_StockIssuedDuringPeriodSharesStockOptionsExpired" xlink:label="OPTT_StockIssuedDuringPeriodSharesStockOptionsExpired" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_StockIssuedDuringPeriodSharesStockOptionsExpired" xlink:to="OPTT_StockIssuedDuringPeriodSharesStockOptionsExpired_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="OPTT_StockIssuedDuringPeriodSharesStockOptionsExpired_lbl" xml:lang="en-US">Shares Underlying Options Outstanding, Expired</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice" xlink:to="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice_lbl" xml:lang="en-US">Weighted Average Exercise Price, Expired</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod_lbl" xml:lang="en-US">Shares Underlying Options Outstanding, Cancelled/forfeited</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice_lbl" xml:lang="en-US">Weighted Average Exercise Price, Cancelled/forfeited</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_2_lbl" xml:lang="en-US">Shares Underlying Options Outstanding, Ending</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_2_lbl" xml:lang="en-US">Weighted Average Exercise Price, Ending Balance</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm" xlink:label="OPTT_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm" xlink:to="OPTT_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm_lbl" xml:lang="en-US">Weighted Average Remaining Contractual Term (In Years), Ending</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_lbl" xml:lang="en-US">Shares Underlying Options Outstanding, Exercisable at Ending</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_lbl" xml:lang="en-US">Weighted Average Exercise Price, Exercisable at Ending</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1" xlink:to="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_lbl" xml:lang="en-US">Weighted Average Remaining Contractual Term (In Years), Exercisable at Ending</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable" xlink:label="us-gaap_ScheduleOfRestructuringAndRelatedCostsTable" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleOfRestructuringAndRelatedCostsTable" xlink:to="us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_lbl" xml:lang="en-US">Schedule of Restructuring and Related Costs [Table]</link:label>
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RestructuringCostAndReserveLineItems" xlink:to="us-gaap_RestructuringCostAndReserveLineItems_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RestructuringCostAndReserveLineItems_lbl" xml:lang="en-US">Restructuring Cost and Reserve [Line Items]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_AdjustedFairValue" xlink:label="OPTT_AdjustedFairValue" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_AdjustedFairValue" xlink:to="OPTT_AdjustedFairValue_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_AdjustedFairValue_lbl" xml:lang="en-US">Fair Value of Purchase</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets" xlink:label="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets" xlink:to="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_lbl" xml:lang="en-US">Total Acquired Assets</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities" xlink:label="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities" xlink:to="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_lbl" xml:lang="en-US">Total Acquired Liabilities</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_BusinessComibinationCompensationExpensesRecognized" xlink:label="OPTT_BusinessComibinationCompensationExpensesRecognized" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_BusinessComibinationCompensationExpensesRecognized" xlink:to="OPTT_BusinessComibinationCompensationExpensesRecognized_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_BusinessComibinationCompensationExpensesRecognized_lbl" xml:lang="en-US">Compensation Expense</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_BusinessComibinationQuarterlyCompensationExpensesRecognized" xlink:label="OPTT_BusinessComibinationQuarterlyCompensationExpensesRecognized" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_BusinessComibinationQuarterlyCompensationExpensesRecognized" xlink:to="OPTT_BusinessComibinationQuarterlyCompensationExpensesRecognized_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_BusinessComibinationQuarterlyCompensationExpensesRecognized_lbl" xml:lang="en-US">Quarterly Compensation Expense</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_lbl" xml:lang="en-US">Number of Shares, Issued and unvested, Beginning</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_lbl" xml:lang="en-US">Weighted Average Price per Share, Issued and Unvested, Beginning</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_lbl" xml:lang="en-US">Number of Shares, Granted</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_lbl" xml:lang="en-US">Weighted Average Price per Share, Granted</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_lbl" xml:lang="en-US">Number of Shares, Vested</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_lbl" xml:lang="en-US">Weighted Average Price per Share, Vested</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_lbl" xml:lang="en-US">Number of Shares, Cancelled/forfeited</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_lbl" xml:lang="en-US">Weighted Average Price per Share, Cancelled/forfeited</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_2_lbl" xml:lang="en-US">Number of Shares, Issued and Unvested, Ending</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_2_lbl" xml:lang="en-US">Weighted Average Price per Share, Issued and Unvested, Ending</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_EmployeeStockOptionOneMember" xlink:label="OPTT_EmployeeStockOptionOneMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_EmployeeStockOptionOneMember" xlink:to="OPTT_EmployeeStockOptionOneMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_EmployeeStockOptionOneMember_lbl" xml:lang="en-US">Employee Stock Option One [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_lbl" xml:lang="en-US">Share-based compensation arrangement shares authorized</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockCapitalSharesReservedForFutureIssuance" xlink:label="us-gaap_CommonStockCapitalSharesReservedForFutureIssuance" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommonStockCapitalSharesReservedForFutureIssuance" xlink:to="us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_lbl" xml:lang="en-US">Capital shares reserved for future issuance</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_2_lbl" xml:lang="en-US">Share-based compensation options, grants in period, gross</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_lbl" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares" xlink:to="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares_lbl" xml:lang="en-US">Options unvested</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1" xlink:to="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1_lbl" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpense" xlink:label="us-gaap_AllocatedShareBasedCompensationExpense" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AllocatedShareBasedCompensationExpense" xlink:to="us-gaap_AllocatedShareBasedCompensationExpense_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AllocatedShareBasedCompensationExpense_lbl" xml:lang="en-US">Share-based payment arrangement, expense</link:label>
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions" xlink:to="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions_lbl" xml:lang="en-US">Unrecognized compensation cost related to non-vested stock</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1" xlink:to="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_lbl" xml:lang="en-US">Share-based compensation of weighted-average period</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_FairValueOfBasePurchasePrice" xlink:label="OPTT_FairValueOfBasePurchasePrice" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_FairValueOfBasePurchasePrice" xlink:to="OPTT_FairValueOfBasePurchasePrice_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_FairValueOfBasePurchasePrice_lbl" xml:lang="en-US">Fair value of base purchase price</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesNewIssues" xlink:label="us-gaap_StockIssuedDuringPeriodSharesNewIssues" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodSharesNewIssues" xlink:to="us-gaap_StockIssuedDuringPeriodSharesNewIssues_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockIssuedDuringPeriodSharesNewIssues_lbl" xml:lang="en-US">Stock Issued During Period, Shares, New Issues</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionSharePrice" xlink:label="us-gaap_BusinessAcquisitionSharePrice" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_BusinessAcquisitionSharePrice" xlink:to="us-gaap_BusinessAcquisitionSharePrice_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_BusinessAcquisitionSharePrice_lbl" xml:lang="en-US">Business Acquisition, Share Price</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_BusinessComibinationQuarterlyCompensationExpensesConsiderationPaid" xlink:label="OPTT_BusinessComibinationQuarterlyCompensationExpensesConsiderationPaid" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_BusinessComibinationQuarterlyCompensationExpensesConsiderationPaid" xlink:to="OPTT_BusinessComibinationQuarterlyCompensationExpensesConsiderationPaid_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_BusinessComibinationQuarterlyCompensationExpensesConsiderationPaid_lbl" xml:lang="en-US">Business comibination quarterly compensation expenses recognized consideration paid</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesVestedAndOutstanding" xlink:label="OPTT_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesVestedAndOutstanding" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesVestedAndOutstanding" xlink:to="OPTT_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesVestedAndOutstanding_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesVestedAndOutstanding_lbl" xml:lang="en-US">Shares vested and outstanding</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentMaturityDate" xlink:label="us-gaap_DebtInstrumentMaturityDate" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DebtInstrumentMaturityDate" xlink:to="us-gaap_DebtInstrumentMaturityDate_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DebtInstrumentMaturityDate_lbl" xml:lang="en-US">Debt expire date</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_StockOptionsVestingPeriodDescription" xlink:label="OPTT_StockOptionsVestingPeriodDescription" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_StockOptionsVestingPeriodDescription" xlink:to="OPTT_StockOptionsVestingPeriodDescription_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_StockOptionsVestingPeriodDescription_lbl" xml:lang="en-US">Stock options vesting period description</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_2_lbl" xml:lang="en-US">Restricted stock option granted</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions" xlink:to="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_lbl" xml:lang="en-US">Unrecognized compensation cost</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable" xlink:label="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable" xlink:to="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_lbl" xml:lang="en-US">Fair Value Measurement Inputs and Valuation Techniques [Table]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems" xlink:label="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems" xlink:to="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_lbl" xml:lang="en-US">Fair Value Measurement Inputs and Valuation Techniques [Line Items]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_2_lbl" xml:lang="en-US">Dividend rate</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueNetAssetLiability" xlink:label="us-gaap_FairValueNetAssetLiability" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueNetAssetLiability" xlink:to="us-gaap_FairValueNetAssetLiability_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FairValueNetAssetLiability_lbl" xml:lang="en-US">Fair value on a recurring basis</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LossContingenciesTable" xlink:label="us-gaap_LossContingenciesTable" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LossContingenciesTable" xlink:to="us-gaap_LossContingenciesTable_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LossContingenciesTable_lbl" xml:lang="en-US">Loss Contingencies [Table]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LossContingenciesLineItems" xlink:label="us-gaap_LossContingenciesLineItems" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LossContingenciesLineItems" xlink:to="us-gaap_LossContingenciesLineItems_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LossContingenciesLineItems_lbl" xml:lang="en-US">Loss Contingencies [Line Items]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LossContingencyDamagesSoughtValue" xlink:label="us-gaap_LossContingencyDamagesSoughtValue" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LossContingencyDamagesSoughtValue" xlink:to="us-gaap_LossContingencyDamagesSoughtValue_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LossContingencyDamagesSoughtValue_lbl" xml:lang="en-US">Loss contingency, damages sought, value</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued" xlink:label="us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued" xlink:to="us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued_lbl" xml:lang="en-US">Income tax penalties</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfDeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTitleOfIndividualAndByTypeOfDeferredCompensationTable" xlink:label="us-gaap_ScheduleOfDeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTitleOfIndividualAndByTypeOfDeferredCompensationTable" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleOfDeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTitleOfIndividualAndByTypeOfDeferredCompensationTable" xlink:to="us-gaap_ScheduleOfDeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTitleOfIndividualAndByTypeOfDeferredCompensationTable_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ScheduleOfDeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTitleOfIndividualAndByTypeOfDeferredCompensationTable_lbl" xml:lang="en-US">Schedule of Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits, by Title of Individual and by Type of Deferred Compensation [Table]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsLineItems" xlink:label="us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsLineItems" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsLineItems" xlink:to="us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsLineItems_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsLineItems_lbl" xml:lang="en-US">Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingIncomeLoss" xlink:to="us-gaap_OperatingIncomeLoss_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OperatingIncomeLoss_2_lbl" xml:lang="en-US">Operating Income (Loss)</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProceedsFromDebtNetOfIssuanceCosts" xlink:label="us-gaap_ProceedsFromDebtNetOfIssuanceCosts" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ProceedsFromDebtNetOfIssuanceCosts" xlink:to="us-gaap_ProceedsFromDebtNetOfIssuanceCosts_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ProceedsFromDebtNetOfIssuanceCosts_lbl" xml:lang="en-US">Proceeds from Debt, Net of Issuance Costs</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NumberOfOperatingSegments" xlink:label="us-gaap_NumberOfOperatingSegments" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NumberOfOperatingSegments" xlink:to="us-gaap_NumberOfOperatingSegments_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NumberOfOperatingSegments_lbl" xml:lang="en-US">Number of Operating Segments</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:label="us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:to="us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_lbl" xml:lang="en-US">Schedule of Business Acquisitions, by Acquisition [Table]</link:label>
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_BusinessAcquisitionLineItems" xlink:to="us-gaap_BusinessAcquisitionLineItems_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_BusinessAcquisitionLineItems_lbl" xml:lang="en-US">Business Acquisition [Line Items]</link:label>
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_CommonWarrantsMember_doc" xml:lang="en-US">Common Warrants [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_PaycheckProtectionProgramMember" xlink:to="OPTT_PaycheckProtectionProgramMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_PaycheckProtectionProgramMember_doc" xml:lang="en-US">Paycheck Protection Program [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_DebtForgivenessDescription" xlink:to="OPTT_DebtForgivenessDescription_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_DebtForgivenessDescription_doc" xml:lang="en-US">Description for the amount decreases as the indebtedness forgiven by the holder of the debt instrument.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_AcquisitionOfPropertyPlantAndEquipmentThroughAccountsPayable" xlink:to="OPTT_AcquisitionOfPropertyPlantAndEquipmentThroughAccountsPayable_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_AcquisitionOfPropertyPlantAndEquipmentThroughAccountsPayable_doc" xml:lang="en-US">Acquisition of property plant and equipment through accounts payable.</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_InvestmentInNetOfAssetsAcquired" xlink:label="OPTT_InvestmentInNetOfAssetsAcquired" />
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_InvestmentInNetOfAssetsAcquired_doc" xml:lang="en-US">Investment in net of assets acquired.</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_SupplementalNoncashInvestingActivitiesAbstract" xlink:label="OPTT_SupplementalNoncashInvestingActivitiesAbstract" />
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_SupplementalNoncashInvestingActivitiesAbstract_doc" xml:lang="en-US">Supplemental Noncash Investing Activities [Abstract]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_SupplementalNoncashFinancingActivitiesAbstract" xlink:label="OPTT_SupplementalNoncashFinancingActivitiesAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_SupplementalNoncashFinancingActivitiesAbstract" xlink:to="OPTT_SupplementalNoncashFinancingActivitiesAbstract_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_SupplementalNoncashFinancingActivitiesAbstract_doc" xml:lang="en-US">Supplemental Noncash Financing Activities [Abstract]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_TwoThousandAndFifteenOmnibusIncentivePlanMember" xlink:to="OPTT_TwoThousandAndFifteenOmnibusIncentivePlanMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_TwoThousandAndFifteenOmnibusIncentivePlanMember_doc" xml:lang="en-US">2015 Omnibus Incentive Plan [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_TwoThousandAndEighteenInducementPlanMember" xlink:to="OPTT_TwoThousandAndEighteenInducementPlanMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_TwoThousandAndEighteenInducementPlanMember_doc" xml:lang="en-US">2018 Inducement Plan [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_PerformanceObligationSharesCompensation" xlink:label="OPTT_PerformanceObligationSharesCompensation" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_PerformanceObligationSharesCompensation" xlink:to="OPTT_PerformanceObligationSharesCompensation_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_PerformanceObligationSharesCompensation_doc" xml:lang="en-US">Performance obligation shares compensation.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_TwoExecutivesMember" xlink:to="OPTT_TwoExecutivesMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_TwoExecutivesMember_doc" xml:lang="en-US">Two Executives [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_ScheduleOfBusinessAcquisitionAndFairValueOfNetAssetsCompensationExpenseRecognized" xlink:to="OPTT_ScheduleOfBusinessAcquisitionAndFairValueOfNetAssetsCompensationExpenseRecognized_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_ScheduleOfBusinessAcquisitionAndFairValueOfNetAssetsCompensationExpenseRecognized_doc" xml:lang="en-US">Schedule of business acquisition and fair value of net assets compensation expense recognized [Table Text Block]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_ProceedsFromInitialPublicOffering" xlink:to="OPTT_ProceedsFromInitialPublicOffering_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_ProceedsFromInitialPublicOffering_doc" xml:lang="en-US">The cash inflow associated with the amount received from entity's first offering of stock to the public.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_TwoThousandNinteenATMFacilityMember" xlink:to="OPTT_TwoThousandNinteenATMFacilityMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_TwoThousandNinteenATMFacilityMember_doc" xml:lang="en-US">2019 ATM Facility [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_AGPAllianceGlobalPartnersMember" xlink:to="OPTT_AGPAllianceGlobalPartnersMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_AGPAllianceGlobalPartnersMember_doc" xml:lang="en-US">A.G.P Alliance Global Partners [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_PerformanceStockOptionsMember" xlink:to="OPTT_PerformanceStockOptionsMember_doc" xlink:type="arc" />
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_PaymentOfSalesCommission" xlink:to="OPTT_PaymentOfSalesCommission_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_PaymentOfSalesCommission_doc" xml:lang="en-US">Payment of sales commission.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_TwoThousandTwentyATMFacilityMember" xlink:to="OPTT_TwoThousandTwentyATMFacilityMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_TwoThousandTwentyATMFacilityMember_doc" xml:lang="en-US">2020 ATM Facility [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_StockIssuedDuringPeriodValueIssuedForCommitmentFee" xlink:to="OPTT_StockIssuedDuringPeriodValueIssuedForCommitmentFee_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_StockIssuedDuringPeriodValueIssuedForCommitmentFee_doc" xml:lang="en-US">Aggregate purchase of common stock.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_StockPurchaseAgreementMember" xlink:to="OPTT_StockPurchaseAgreementMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_StockPurchaseAgreementMember_doc" xml:lang="en-US">Stock Purchase Agreement [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_AspireCapitalFundLLCMember" xlink:to="OPTT_AspireCapitalFundLLCMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_AspireCapitalFundLLCMember_doc" xml:lang="en-US">Aspire Capital Fund, LLC [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_PercentageOfOutstandingCommonStockLimitForShareholderApproval" xlink:to="OPTT_PercentageOfOutstandingCommonStockLimitForShareholderApproval_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_PercentageOfOutstandingCommonStockLimitForShareholderApproval_doc" xml:lang="en-US">Percentage of outstanding common stock limit for shareholder approval.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_StockIssuedDuringPeriodSharesCanBeIssuedBasedUponOutstandingPercentage" xlink:to="OPTT_StockIssuedDuringPeriodSharesCanBeIssuedBasedUponOutstandingPercentage_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_StockIssuedDuringPeriodSharesCanBeIssuedBasedUponOutstandingPercentage_doc" xml:lang="en-US">Number of shares can be issued based upon outstanding percentage.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_StockPurchaseAgreementOneMember" xlink:to="OPTT_StockPurchaseAgreementOneMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_StockPurchaseAgreementOneMember_doc" xml:lang="en-US">Stock Purchase Agreement One [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_NumberOfAdditionalSharesThatCanBeIssuedUponShareholderApproval" xlink:to="OPTT_NumberOfAdditionalSharesThatCanBeIssuedUponShareholderApproval_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_NumberOfAdditionalSharesThatCanBeIssuedUponShareholderApproval_doc" xml:lang="en-US">Number of additional shares that can be issued upon shareholder approval.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_StockIncentivePlanMember" xlink:to="OPTT_StockIncentivePlanMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_StockIncentivePlanMember_doc" xml:lang="en-US">Stock Incentive Plan [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_StockIssuedDuringPeriodSharesStockOptionsExpired" xlink:to="OPTT_StockIssuedDuringPeriodSharesStockOptionsExpired_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_StockIssuedDuringPeriodSharesStockOptionsExpired_doc" xml:lang="en-US">Stock issued during period shares stock options expired</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm" xlink:to="OPTT_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm_doc" xml:lang="en-US">Weighted Average Remaining Contractual Term (In Years), Ending.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_ThreeDentAcquisitionMember" xlink:to="OPTT_ThreeDentAcquisitionMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_ThreeDentAcquisitionMember_doc" xml:lang="en-US">3Dent Acquisition [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_BusinessComibinationCompensationExpensesRecognized" xlink:to="OPTT_BusinessComibinationCompensationExpensesRecognized_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_BusinessComibinationCompensationExpensesRecognized_doc" xml:lang="en-US">Business comibination compensation expenses recognized.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_BusinessComibinationQuarterlyCompensationExpensesRecognized" xlink:to="OPTT_BusinessComibinationQuarterlyCompensationExpensesRecognized_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_BusinessComibinationQuarterlyCompensationExpensesRecognized_doc" xml:lang="en-US">Business comibination quarterly compensation expenses recognized.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_CheckingAndSavingsAccountsMember" xlink:to="OPTT_CheckingAndSavingsAccountsMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_CheckingAndSavingsAccountsMember_doc" xml:lang="en-US">Checking and Savings Accounts [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_AdjustedFairValue" xlink:to="OPTT_AdjustedFairValue_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_AdjustedFairValue_doc" xml:lang="en-US">Adjusted fair value.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_EniSPAMember" xlink:to="OPTT_EniSPAMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_EniSPAMember_doc" xml:lang="en-US">Eni S.p.A [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_DepartmentOfEnergyMember" xlink:to="OPTT_DepartmentOfEnergyMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_DepartmentOfEnergyMember_doc" xml:lang="en-US">Department of Energy [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_EGPMember" xlink:to="OPTT_EGPMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_EGPMember_doc" xml:lang="en-US">EGP [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_ACETMember" xlink:to="OPTT_ACETMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_ACETMember_doc" xml:lang="en-US">ACET [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_ValarisFNIMember" xlink:to="OPTT_ValarisFNIMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_ValarisFNIMember_doc" xml:lang="en-US">Valaris FNI [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_NonVestedRestrictedStockMember" xlink:to="OPTT_NonVestedRestrictedStockMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_NonVestedRestrictedStockMember_doc" xml:lang="en-US">Non-vested Restricted Stock [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_BrighamYoungUniversityMember" xlink:to="OPTT_BrighamYoungUniversityMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_BrighamYoungUniversityMember_doc" xml:lang="en-US">Brigham Young University [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_NipponKaiyoMember" xlink:to="OPTT_NipponKaiyoMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_NipponKaiyoMember_doc" xml:lang="en-US">Nippon Kaiyo [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_NavalSurfaceWarfareCenterMember" xlink:to="OPTT_NavalSurfaceWarfareCenterMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_NavalSurfaceWarfareCenterMember_doc" xml:lang="en-US">Naval Surface Warfare Center [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_OtherMember" xlink:to="OPTT_OtherMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_OtherMember_doc" xml:lang="en-US">Other [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_EmployeeStockOptionOneMember" xlink:to="OPTT_EmployeeStockOptionOneMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_EmployeeStockOptionOneMember_doc" xml:lang="en-US">Employee Stock Option One [Member]</link:label>
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_EngineeringAndProductDevelopmentMember_doc" xml:lang="en-US">Engineering and Product Development [Member]</link:label>
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_FairValueOfBasePurchasePrice_doc" xml:lang="en-US">Fair value of base purchase price.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_BusinessComibinationQuarterlyCompensationExpensesConsiderationPaid" xlink:to="OPTT_BusinessComibinationQuarterlyCompensationExpensesConsiderationPaid_doc" xlink:type="arc" />
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_RestrictedCashAndSecurityAgreementsMember_doc" xml:lang="en-US">Restricted Cash and Security Agreements [Member]</link:label>
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_SantanderBankMember_doc" xml:lang="en-US">Santander Bank [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_LetterOneMember" xlink:to="OPTT_LetterOneMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_LetterOneMember_doc" xml:lang="en-US">Letter 1 [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_LetterTwoMember" xlink:to="OPTT_LetterTwoMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_LetterTwoMember_doc" xml:lang="en-US">Letter 2 [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_AugustTwentyTwentyMember" xlink:to="OPTT_AugustTwentyTwentyMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_AugustTwentyTwentyMember_doc" xml:lang="en-US">August 2020 [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_LettersOfCreditIssuedAmount" xlink:to="OPTT_LettersOfCreditIssuedAmount_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_LettersOfCreditIssuedAmount_doc" xml:lang="en-US">Letters of credit issued, amount.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_EmployeesAndExecutivesMember" xlink:to="OPTT_EmployeesAndExecutivesMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_EmployeesAndExecutivesMember_doc" xml:lang="en-US">Employees and Executives [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_StockOptionsVestingPeriodDescription" xlink:to="OPTT_StockOptionsVestingPeriodDescription_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_StockOptionsVestingPeriodDescription_doc" xml:lang="en-US">Stock options vesting period, description.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_ForeignFinancialInstitutionsMember" xlink:to="OPTT_ForeignFinancialInstitutionsMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_ForeignFinancialInstitutionsMember_doc" xml:lang="en-US">Foreign Financial Institutions [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_RevenueRemainingPerformancesObligationPercentage" xlink:to="OPTT_RevenueRemainingPerformancesObligationPercentage_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_RevenueRemainingPerformancesObligationPercentage_doc" xml:lang="en-US">Percentage of remaining performance obligation to total remaining performance obligation not recognized as revenue.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_ScheduleOfAccountsReceivableContractAssetsAndContractLiabilitiesTableTextBlock" xlink:to="OPTT_ScheduleOfAccountsReceivableContractAssetsAndContractLiabilitiesTableTextBlock_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_ScheduleOfAccountsReceivableContractAssetsAndContractLiabilitiesTableTextBlock_doc" xml:lang="en-US">Schedule Of Accounts Receivable Contract Assets And Contract Liabilities [Table Text Block]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_EmployeeMember" xlink:to="OPTT_EmployeeMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_EmployeeMember_doc" xml:lang="en-US">Employee [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_SubjectToServiceBasedVestingRequirementsMember" xlink:to="OPTT_SubjectToServiceBasedVestingRequirementsMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_SubjectToServiceBasedVestingRequirementsMember_doc" xml:lang="en-US">Subject to Service- Based Vesting Requirements [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionTableTextBlock" xlink:to="OPTT_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionTableTextBlock_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionTableTextBlock_doc" xml:lang="en-US">Schedule Of Share Based Payment Award Stock Options Valuation Assumption [Table Text Block]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_PrepaidRecruitingAndHR" xlink:to="OPTT_PrepaidRecruitingAndHR_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_PrepaidRecruitingAndHR_doc" xml:lang="en-US">Prepaid Recruiting and HR.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_CharlesFDunleavyMember" xlink:to="OPTT_CharlesFDunleavyMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_CharlesFDunleavyMember_doc" xml:lang="en-US">Charles F. Dunleavy [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_NJNOLMember" xlink:label="OPTT_NJNOLMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_NJNOLMember" xlink:to="OPTT_NJNOLMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_NJNOLMember_doc" xml:lang="en-US">NJ NOL [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_PrepaidSoftwareAndLicenses" xlink:to="OPTT_PrepaidSoftwareAndLicenses_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_PrepaidSoftwareAndLicenses_doc" xml:lang="en-US">Prepaid software and licenses.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_PrepaidSalesAndMarketing" xlink:to="OPTT_PrepaidSalesAndMarketing_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_PrepaidSalesAndMarketing_doc" xml:lang="en-US">Prepaid sales and marketing.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_ComputerEquipmentAndSoftwareMember" xlink:to="OPTT_ComputerEquipmentAndSoftwareMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_ComputerEquipmentAndSoftwareMember_doc" xml:lang="en-US">Computer Equipment And Software [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_OfficeFurnitureAndEquipmentMember" xlink:to="OPTT_OfficeFurnitureAndEquipmentMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_OfficeFurnitureAndEquipmentMember_doc" xml:lang="en-US">Office Furniture And Equipment [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_MarineAdvancedRoboticsIncMember" xlink:to="OPTT_MarineAdvancedRoboticsIncMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_MarineAdvancedRoboticsIncMember_doc" xml:lang="en-US">Marine Advanced Robotics, Inc. [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_ScheduleOfRightofUseAssetsAndLeaseLiabilitiesTableTextBlock" xlink:to="OPTT_ScheduleOfRightofUseAssetsAndLeaseLiabilitiesTableTextBlock_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_ScheduleOfRightofUseAssetsAndLeaseLiabilitiesTableTextBlock_doc" xml:lang="en-US">Schedule Of Right of Use Assets And Lease Liabilities [Table Text Block]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_MonroeTownshipMember" xlink:to="OPTT_MonroeTownshipMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_MonroeTownshipMember_doc" xml:lang="en-US">Monroe Township [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_ProceedFromSaleOfLossCarryforwardsAndTaxCredits" xlink:label="OPTT_ProceedFromSaleOfLossCarryforwardsAndTaxCredits" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_ProceedFromSaleOfLossCarryforwardsAndTaxCredits" xlink:to="OPTT_ProceedFromSaleOfLossCarryforwardsAndTaxCredits_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_ProceedFromSaleOfLossCarryforwardsAndTaxCredits_doc" xml:lang="en-US">Amount received from sale of net operating loss carryforwards and other tax credits.</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_NJMember" xlink:label="OPTT_NJMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_NJMember" xlink:to="OPTT_NJMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_NJMember_doc" xml:lang="en-US">New Jersey [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_AccountReceivableContractAssetsAndContractLiabilitiesTextBlock" xlink:to="OPTT_AccountReceivableContractAssetsAndContractLiabilitiesTextBlock_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_AccountReceivableContractAssetsAndContractLiabilitiesTextBlock_doc" xml:lang="en-US">Account receivable contract assets and contract liabilities [Text Block]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_OutstandingReceivableForSaleOfSharesFromWarrantExercises" xlink:to="OPTT_OutstandingReceivableForSaleOfSharesFromWarrantExercises_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_OutstandingReceivableForSaleOfSharesFromWarrantExercises_doc" xml:lang="en-US">Outstanding receivable for sale of shares from warrant exercises.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_OutstandingReceivableForSaleOfSharesFromStockOptionExercises" xlink:to="OPTT_OutstandingReceivableForSaleOfSharesFromStockOptionExercises_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_OutstandingReceivableForSaleOfSharesFromStockOptionExercises_doc" xml:lang="en-US">Outstanding receivable for sale of shares from stock option exercises.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesVestedAndOutstanding" xlink:to="OPTT_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesVestedAndOutstanding_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesVestedAndOutstanding_doc" xml:lang="en-US">Share based compensation arrangement by share based payment award number of shares vested and outstanding.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_MarineAdvanceRoboticsIncMember" xlink:to="OPTT_MarineAdvanceRoboticsIncMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_MarineAdvanceRoboticsIncMember_doc" xml:lang="en-US">Marine Advance Robotics Inc [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_BusinessCombinationTextBlock" xlink:label="OPTT_BusinessCombinationTextBlock" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_BusinessCombinationTextBlock" xlink:to="OPTT_BusinessCombinationTextBlock_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_BusinessCombinationTextBlock_doc" xml:lang="en-US">Business Combination [Text Block]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_BusinessCombinationConsiderationTransferredFairValue" xlink:label="OPTT_BusinessCombinationConsiderationTransferredFairValue" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_BusinessCombinationConsiderationTransferredFairValue" xlink:to="OPTT_BusinessCombinationConsiderationTransferredFairValue_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_BusinessCombinationConsiderationTransferredFairValue_doc" xml:lang="en-US">Business combination consideration transferred fair value.</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_NonCashOperatingAndFinancingActivitiesAbstract" xlink:label="OPTT_NonCashOperatingAndFinancingActivitiesAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_NonCashOperatingAndFinancingActivitiesAbstract" xlink:to="OPTT_NonCashOperatingAndFinancingActivitiesAbstract_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_NonCashOperatingAndFinancingActivitiesAbstract_doc" xml:lang="en-US">Non Cash Operating And Financing Activities Abstract.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_ContingentLiability" xlink:to="OPTT_ContingentLiability_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_ContingentLiability_doc" xml:lang="en-US">Contingent liability.</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_IssuanceOfCommonStockInAcquisitionOfMar" xlink:label="OPTT_IssuanceOfCommonStockInAcquisitionOfMar" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_IssuanceOfCommonStockInAcquisitionOfMar" xlink:to="OPTT_IssuanceOfCommonStockInAcquisitionOfMar_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_IssuanceOfCommonStockInAcquisitionOfMar_doc" xml:lang="en-US">Issuance Of Common Stock In Acquisition Of Mar.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_IssuanceOfCommonStockInAcquisition" xlink:to="OPTT_IssuanceOfCommonStockInAcquisition_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_IssuanceOfCommonStockInAcquisition_doc" xml:lang="en-US">Issuance of common stock in acquisition.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_AdvancePayableCurrent" xlink:to="OPTT_AdvancePayableCurrent_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_AdvancePayableCurrent_doc" xml:lang="en-US">Advance payable current.</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220131.xsd#OPTT_IncreaseDecreaseInAdvancePayable" xlink:label="OPTT_IncreaseDecreaseInAdvancePayable" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_IncreaseDecreaseInAdvancePayable" xlink:to="OPTT_IncreaseDecreaseInAdvancePayable_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_IncreaseDecreaseInAdvancePayable_doc" xml:lang="en-US">Increase Decrease in Advance Payable.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_USEmployeesMember" xlink:to="OPTT_USEmployeesMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_USEmployeesMember_doc" xml:lang="en-US">US Employees [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AssetsCurrent" xlink:to="us-gaap_AssetsCurrent_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AssetsCurrent_2_lbl" xml:lang="en-US">Assets, Current</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_Assets" xlink:to="us-gaap_Assets_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_Assets_2_lbl" xml:lang="en-US">Assets</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LiabilitiesCurrent" xlink:to="us-gaap_LiabilitiesCurrent_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LiabilitiesCurrent_2_lbl" xml:lang="en-US">Liabilities, Current</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_Liabilities" xlink:to="us-gaap_Liabilities_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_Liabilities_2_lbl" xml:lang="en-US">Liabilities</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_TreasuryStockValue" xlink:to="us-gaap_TreasuryStockValue_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_TreasuryStockValue_2_lbl" xml:lang="en-US">Treasury Stock, Value</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockholdersEquity" xlink:to="us-gaap_StockholdersEquity_4_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockholdersEquity_4_lbl" xml:lang="en-US">Stockholders' Equity Attributable to Parent</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LiabilitiesAndStockholdersEquity" xlink:to="us-gaap_LiabilitiesAndStockholdersEquity_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LiabilitiesAndStockholdersEquity_2_lbl" xml:lang="en-US">Liabilities and Equity</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_GrossProfit" xlink:to="us-gaap_GrossProfit_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_GrossProfit_2_lbl" xml:lang="en-US">Gross Profit</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingExpenses" xlink:to="us-gaap_OperatingExpenses_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OperatingExpenses_2_lbl" xml:lang="en-US">Operating Expenses</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest" xlink:to="us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_2_lbl" xml:lang="en-US">Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest" xlink:to="us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_2_lbl" xml:lang="en-US">Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest</link:label>
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_GainLossOnSaleOfPropertyPlantEquipment" xlink:to="us-gaap_GainLossOnSaleOfPropertyPlantEquipment_2_lbl" xlink:type="arc" />
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_ChangeInFairValueOfContigentLiability" xlink:to="OPTT_ChangeInFairValueOfContigentLiability_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_ChangeInFairValueOfContigentLiability_2_lbl" xml:lang="en-US">ChangeInFairValueOfContigentLiability</link:label>
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInContractWithCustomerAsset" xlink:to="us-gaap_IncreaseDecreaseInContractWithCustomerAsset_3_lbl" xlink:type="arc" />
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInInventories" xlink:to="us-gaap_IncreaseDecreaseInInventories_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IncreaseDecreaseInInventories_2_lbl" xml:lang="en-US">Increase (Decrease) in Inventories</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInOtherOperatingAssets" xlink:to="us-gaap_IncreaseDecreaseInOtherOperatingAssets_2_lbl" xlink:type="arc" />
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInAccountsPayable" xlink:to="us-gaap_IncreaseDecreaseInAccountsPayable_2_lbl" xlink:type="arc" />
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_IncreaseDecreaseInLitigationPayable" xlink:to="OPTT_IncreaseDecreaseInLitigationPayable_3_lbl" xlink:type="arc" />
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired" xlink:to="us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_2_lbl" xlink:type="arc" />
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:to="us-gaap_NetCashProvidedByUsedInInvestingActivities_2_lbl" xlink:type="arc" />
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RepaymentsOfDebt" xlink:to="us-gaap_RepaymentsOfDebt_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RepaymentsOfDebt_2_lbl" xml:lang="en-US">Repayments of Debt</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PaymentsForRepurchaseOfCommonStock" xlink:to="us-gaap_PaymentsForRepurchaseOfCommonStock_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PaymentsForRepurchaseOfCommonStock_2_lbl" xml:lang="en-US">Payments for Repurchase of Common Stock</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:to="us-gaap_NetCashProvidedByUsedInFinancingActivities_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivities_2_lbl" xml:lang="en-US">Net Cash Provided by (Used in) Financing Activities</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect" xlink:to="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_2_lbl" xml:lang="en-US">Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations" xlink:to="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations_3_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations_3_lbl" xml:lang="en-US">Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LesseeOperatingLeasesTextBlock" xlink:to="us-gaap_LesseeOperatingLeasesTextBlock_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LesseeOperatingLeasesTextBlock_2_lbl" xml:lang="en-US">Lessee, Operating Leases [Text Block]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_WarrantDisclosureTextBlock" xlink:to="OPTT_WarrantDisclosureTextBlock_3_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_WarrantDisclosureTextBlock_3_lbl" xml:lang="en-US">WarrantDisclosureTextBlock</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy" xlink:to="us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy_2_lbl" xml:lang="en-US">Share-based Payment Arrangement [Policy Text Block]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ContractWithCustomerAssetNet" xlink:to="us-gaap_ContractWithCustomerAssetNet_3_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ContractWithCustomerAssetNet_3_lbl" xml:lang="en-US">Contract with Customer, Asset, after Allowance for Credit Loss</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DepositsAssetsCurrent" xlink:to="us-gaap_DepositsAssetsCurrent_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DepositsAssetsCurrent_2_lbl" xml:lang="en-US">Deposits Assets, Current</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment" xlink:to="us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_2_lbl" xml:lang="en-US">Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LeaseCost" xlink:to="us-gaap_LeaseCost_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LeaseCost_2_lbl" xml:lang="en-US">Lease, Cost</link:label>
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_2_lbl" xml:lang="en-US">Lessee, Operating Lease, Liability, to be Paid</link:label>
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_2_lbl" xml:lang="en-US">Lessee, Operating Lease, Liability, Undiscounted Excess Amount</link:label>
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_3_lbl" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price</link:label>
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_StockIssuedDuringPeriodSharesStockOptionsExpired_3_lbl" xml:lang="en-US">StockIssuedDuringPeriodSharesStockOptionsExpired</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod_2_lbl" xlink:type="arc" />
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    </link:labelLink>
</link:linkbase>
</XBRL>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-101.PRE
<SEQUENCE>10
<FILENAME>optt-20220131_pre.xml
<DESCRIPTION>XBRL PRESENTATION FILE
<TEXT>
<XBRL>
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<span style="display: none;">v3.22.0.1</span><table class="report" border="0" cellspacing="2" id="idm140163161886744">
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<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Cover - shares<br></strong></div></th>
<th class="th" colspan="1">9 Months Ended</th>
<th class="th" colspan="1"></th>
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<tr>
<th class="th"><div>Jan. 31, 2022</div></th>
<th class="th"><div>Mar. 14, 2022</div></th>
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<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_CoverAbstract', window );"><strong>Cover [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
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<td class="text">&#160;<span></span>
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<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_DocumentType', window );">Document Type</a></td>
<td class="text">10-Q<span></span>
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<td class="text">&#160;<span></span>
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<td class="text">true<span></span>
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<td class="text">&#160;<span></span>
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<td class="text">Jan. 31,  2022<span></span>
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<td class="text">&#160;<span></span>
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<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_DocumentFiscalPeriodFocus', window );">Document Fiscal Period Focus</a></td>
<td class="text">Q3<span></span>
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<td class="text">&#160;<span></span>
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<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_DocumentFiscalYearFocus', window );">Document Fiscal Year Focus</a></td>
<td class="text">2022<span></span>
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<td class="text">&#160;<span></span>
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<td class="text">&#160;<span></span>
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<td class="text">001-33417<span></span>
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<td class="text">OCEAN
POWER TECHNOLOGIES, INC.<span></span>
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<td class="text">&#160;<span></span>
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<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityCentralIndexKey', window );">Entity Central Index Key</a></td>
<td class="text">0001378140<span></span>
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<td class="text">22-2535818<span></span>
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<td class="text">&#160;<span></span>
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<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityIncorporationStateCountryCode', window );">Entity Incorporation, State or Country Code</a></td>
<td class="text">DE<span></span>
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<td class="text">&#160;<span></span>
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<td class="text">28
ENGELHARD DRIVE<span></span>
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<td class="text">&#160;<span></span>
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<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityAddressAddressLine2', window );">Entity Address, Address Line Two</a></td>
<td class="text">SUITE B<span></span>
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<td class="text">&#160;<span></span>
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<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityAddressCityOrTown', window );">Entity Address, City or Town</a></td>
<td class="text">MONROE TOWNSHIP<span></span>
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<td class="text">&#160;<span></span>
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<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityAddressStateOrProvince', window );">Entity Address, State or Province</a></td>
<td class="text">NJ<span></span>
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<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityAddressPostalZipCode', window );">Entity Address, Postal Zip Code</a></td>
<td class="text">08831<span></span>
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<td class="text">&#160;<span></span>
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<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_CityAreaCode', window );">City Area Code</a></td>
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<td class="text">&#160;<span></span>
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<td class="text">730-0400<span></span>
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<td class="text">&#160;<span></span>
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<td class="text">Common
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<td class="text">&#160;<span></span>
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<td class="text">OPTT<span></span>
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<td class="text">&#160;<span></span>
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<td class="text">NYSE<span></span>
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<td class="text">&#160;<span></span>
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<td class="text">Yes<span></span>
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<td class="text">Non-accelerated Filer<span></span>
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<td class="text">&#160;<span></span>
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<td class="text">true<span></span>
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<td class="text">false<span></span>
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<td class="text">false<span></span>
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<td class="text">&#160;<span></span>
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<td class="nump">55,894,213<span></span>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Boolean flag that is true when the XBRL content amends previously-filed or accepted submission.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Area code of city</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Cover page.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Fiscal period values are FY, Q1, Q2, and Q3.  1st, 2nd and 3rd quarter 10-Q or 10-QT statements have value Q1, Q2, and Q3 respectively, with 10-K, 10-KT or other fiscal year statements having FY.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>This is focus fiscal year of the document report in YYYY format. For a 2006 annual report, which may also provide financial information from prior periods, fiscal 2006 should be given as the fiscal year focus. Example: 2006.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>For the EDGAR submission types of Form 8-K: the date of the report, the date of the earliest event reported; for the EDGAR submission types of Form N-1A: the filing date; for all other submission types: the end of the reporting or transition period.  The format of the date is YYYY-MM-DD.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
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<td><strong> Data Type:</strong></td>
<td>xbrli:dateItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_DocumentQuarterlyReport">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Boolean flag that is true only for a form used as an quarterly report.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Form 10-Q<br> -Number 240<br> -Section 308<br> -Subsection a<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_DocumentQuarterlyReport</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:booleanItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_DocumentTransitionReport">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Boolean flag that is true only for a form used as a transition report.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Forms 10-K, 10-Q, 20-F<br> -Number 240<br> -Section 13<br> -Subsection a-1<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_DocumentTransitionReport</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:booleanItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_DocumentType">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The type of document being provided (such as 10-K, 10-Q, 485BPOS, etc). The document type is limited to the same value as the supporting SEC submission type, or the word 'Other'.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_DocumentType</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:submissionTypeItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityAddressAddressLine1">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Address Line 1 such as Attn, Building Name, Street Name</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityAddressAddressLine1</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:normalizedStringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityAddressAddressLine2">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Address Line 2 such as Street or Suite number</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityAddressAddressLine2</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:normalizedStringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityAddressCityOrTown">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Name of the City or Town</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityAddressCityOrTown</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:normalizedStringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityAddressPostalZipCode">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Code for the postal or zip code</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityAddressPostalZipCode</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:normalizedStringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityAddressStateOrProvince">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Name of the state or province.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityAddressStateOrProvince</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:stateOrProvinceItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityCentralIndexKey">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Exchange Act<br> -Number 240<br> -Section 12<br> -Subsection b-2<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityCentralIndexKey</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:centralIndexKeyItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityCommonStockSharesOutstanding">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Indicate number of shares or other units outstanding of each of registrant's classes of capital or common stock or other ownership interests, if and as stated on cover of related periodic report. Where multiple classes or units exist define each class/interest by adding class of stock items such as Common Class A [Member], Common Class B [Member] or Partnership Interest [Member] onto the Instrument [Domain] of the Entity Listings, Instrument.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityCommonStockSharesOutstanding</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityCurrentReportingStatus">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Indicate 'Yes' or 'No' whether registrants (1) have filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that registrants were required to file such reports), and (2) have been subject to such filing requirements for the past 90 days. This information should be based on the registrant's current or most recent filing containing the related disclosure.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityCurrentReportingStatus</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:yesNoItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityEmergingGrowthCompany">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Indicate if registrant meets the emerging growth company criteria.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Exchange Act<br> -Number 240<br> -Section 12<br> -Subsection b-2<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityEmergingGrowthCompany</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:booleanItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityFileNumber">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Commission file number. The field allows up to 17 characters. The prefix may contain 1-3 digits, the sequence number may contain 1-8 digits, the optional suffix may contain 1-4 characters, and the fields are separated with a hyphen.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityFileNumber</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:fileNumberItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityFilerCategory">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Indicate whether the registrant is one of the following: Large Accelerated Filer, Accelerated Filer, Non-accelerated Filer. Definitions of these categories are stated in Rule 12b-2 of the Exchange Act. This information should be based on the registrant's current or most recent filing containing the related disclosure.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Exchange Act<br> -Number 240<br> -Section 12<br> -Subsection b-2<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityFilerCategory</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:filerCategoryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityIncorporationStateCountryCode">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Two-character EDGAR code representing the state or country of incorporation.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityIncorporationStateCountryCode</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:edgarStateCountryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityInteractiveDataCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Boolean flag that is true when the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Regulation S-T<br> -Number 232<br> -Section 405<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityInteractiveDataCurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:yesNoItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityRegistrantName">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Exchange Act<br> -Number 240<br> -Section 12<br> -Subsection b-2<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityRegistrantName</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:normalizedStringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityShellCompany">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Boolean flag that is true when the registrant is a shell company as defined in Rule 12b-2 of the Exchange Act.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Exchange Act<br> -Number 240<br> -Section 12<br> -Subsection b-2<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityShellCompany</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:booleanItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntitySmallBusiness">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Indicates that the company is a Smaller Reporting Company (SRC).</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Exchange Act<br> -Number 240<br> -Section 12<br> -Subsection b-2<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntitySmallBusiness</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:booleanItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityTaxIdentificationNumber">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The Tax Identification Number (TIN), also known as an Employer Identification Number (EIN), is a unique 9-digit value assigned by the IRS.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Exchange Act<br> -Number 240<br> -Section 12<br> -Subsection b-2<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityTaxIdentificationNumber</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:employerIdItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_LocalPhoneNumber">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Local phone number for entity.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_LocalPhoneNumber</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:normalizedStringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_Security12bTitle">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Title of a 12(b) registered security.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Exchange Act<br> -Number 240<br> -Section 12<br> -Subsection b<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_Security12bTitle</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:securityTitleItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_SecurityExchangeName">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Name of the Exchange on which a security is registered.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Exchange Act<br> -Number 240<br> -Section 12<br> -Subsection d1-1<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_SecurityExchangeName</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:edgarExchangeCodeItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_TradingSymbol">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Trading symbol of an instrument as listed on an exchange.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_TradingSymbol</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:tradingSymbolItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
</div>
</body>
</html>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>XML
<SEQUENCE>12
<FILENAME>R2.htm
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
<html>
<head>
<title></title>
<link rel="stylesheet" type="text/css" href="report.css">
<script type="text/javascript" src="Show.js">/* Do Not Remove This Comment */</script><script type="text/javascript">
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<body>
<span style="display: none;">v3.22.0.1</span><table class="report" border="0" cellspacing="2" id="idm140163159038216">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Consolidated Balance Sheets - USD ($)<br> $ in Thousands</strong></div></th>
<th class="th"><div>Jan. 31, 2022</div></th>
<th class="th"><div>Apr. 30, 2021</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AssetsCurrentAbstract', window );"><strong>Current assets:</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CashAndCashEquivalentsAtCarryingValue', window );">Cash and cash equivalents</a></td>
<td class="nump">$ 63,454<span></span>
</td>
<td class="nump">$ 83,028<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_RestrictedCashCurrent', window );">Restricted cash, short-term</a></td>
<td class="nump">384<span></span>
</td>
<td class="nump">384<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AccountsReceivableNetCurrent', window );">Accounts receivable</a></td>
<td class="nump">113<span></span>
</td>
<td class="nump">350<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ContractWithCustomerAssetNetCurrent', window );">Contract assets</a></td>
<td class="nump">407<span></span>
</td>
<td class="nump">190<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_InventoryNet', window );">Inventory</a></td>
<td class="nump">193<span></span>
</td>
<td class="text"> <span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OtherAssetsCurrent', window );">Other current assets</a></td>
<td class="nump">436<span></span>
</td>
<td class="nump">487<span></span>
</td>
</tr>
<tr class="rou">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AssetsCurrent', window );">Total current assets</a></td>
<td class="nump">64,987<span></span>
</td>
<td class="nump">84,439<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PropertyPlantAndEquipmentNet', window );">Property and equipment, net</a></td>
<td class="nump">365<span></span>
</td>
<td class="nump">406<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_IntangibleAssetsNetExcludingGoodwill', window );">Intangibles, net</a></td>
<td class="nump">4,203<span></span>
</td>
<td class="nump">274<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OperatingLeaseRightOfUseAsset', window );">Right-of-use asset, net</a></td>
<td class="nump">825<span></span>
</td>
<td class="nump">1,036<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_RestrictedCashNoncurrent', window );">Restricted cash, long-term</a></td>
<td class="nump">222<span></span>
</td>
<td class="nump">222<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_Goodwill', window );">Goodwill</a></td>
<td class="nump">7,754<span></span>
</td>
<td class="text"> <span></span>
</td>
</tr>
<tr class="rou">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_Assets', window );">Total assets</a></td>
<td class="nump">78,356<span></span>
</td>
<td class="nump">86,377<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LiabilitiesCurrentAbstract', window );"><strong>Current liabilities:</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AccountsPayableCurrent', window );">Accounts payable</a></td>
<td class="nump">522<span></span>
</td>
<td class="nump">687<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AccruedLiabilitiesCurrent', window );">Accrued expenses</a></td>
<td class="nump">1,292<span></span>
</td>
<td class="nump">1,881<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ContractWithCustomerLiabilityCurrent', window );">Contract liabilities</a></td>
<td class="nump">15<span></span>
</td>
<td class="text"> <span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OperatingLeaseLiabilityCurrent', window );">Right-of-use liability, current portion</a></td>
<td class="nump">323<span></span>
</td>
<td class="nump">347<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_AdvancePayableCurrent', window );">Advance payable</a></td>
<td class="nump">456<span></span>
</td>
<td class="text"> <span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LitigationReserveCurrent', window );">Litigation payable</a></td>
<td class="text"> <span></span>
</td>
<td class="nump">1,224<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_BusinessCombinationContingentConsiderationLiabilityCurrent', window );">Contingent liabilities</a></td>
<td class="nump">1,591<span></span>
</td>
<td class="nump">60<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LongTermDebtCurrent', window );">Paycheck protection program loan- current</a></td>
<td class="text"> <span></span>
</td>
<td class="nump">495<span></span>
</td>
</tr>
<tr class="rou">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LiabilitiesCurrent', window );">Total current liabilities</a></td>
<td class="nump">4,199<span></span>
</td>
<td class="nump">4,694<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LongTermDebtNoncurrent', window );">Paycheck protection program loan, less current portion</a></td>
<td class="text"> <span></span>
</td>
<td class="nump">396<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OperatingLeaseLiabilityNoncurrent', window );">Right-of-use liability, less current portion</a></td>
<td class="nump">615<span></span>
</td>
<td class="nump">819<span></span>
</td>
</tr>
<tr class="reu">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_Liabilities', window );">Total liabilities</a></td>
<td class="nump">4,814<span></span>
</td>
<td class="nump">5,909<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CommitmentsAndContingencies', window );">Commitments and contingencies (Note 15)</a></td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockholdersEquityAbstract', window );"><strong>Shareholders&#8217; Equity:</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PreferredStockValue', window );">Preferred stock, $0.001 par value; authorized 5,000,000 shares, none issued or outstanding</a></td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CommonStockValue', window );">Common stock, $0.001 par value; authorized 100,000,000 shares, issued 55,894,213 and 52,458,011 shares, respectively</a></td>
<td class="nump">56<span></span>
</td>
<td class="nump">52<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TreasuryStockValue', window );">Treasury stock, at cost; 21,040 shares</a></td>
<td class="num">(338)<span></span>
</td>
<td class="num">(338)<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AdditionalPaidInCapital', window );">Additional paid-in capital</a></td>
<td class="nump">322,626<span></span>
</td>
<td class="nump">315,821<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_RetainedEarningsAccumulatedDeficit', window );">Accumulated deficit</a></td>
<td class="num">(248,617)<span></span>
</td>
<td class="num">(234,896)<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax', window );">Accumulated other comprehensive loss</a></td>
<td class="num">(185)<span></span>
</td>
<td class="num">(171)<span></span>
</td>
</tr>
<tr class="rou">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockholdersEquity', window );">Total shareholders&#8217; equity</a></td>
<td class="nump">73,542<span></span>
</td>
<td class="nump">80,468<span></span>
</td>
</tr>
<tr class="reu">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LiabilitiesAndStockholdersEquity', window );">Total liabilities and shareholders&#8217; equity</a></td>
<td class="nump">$ 78,356<span></span>
</td>
<td class="nump">$ 86,377<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_AdvancePayableCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Advance payable current.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_AdvancePayableCurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AccountsPayableCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.19(a))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 2: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 852<br> -SubTopic 10<br> -Section 55<br> -Paragraph 10<br> -URI http://asc.fasb.org/extlink&amp;oid=84165509&amp;loc=d3e56426-112766<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AccountsPayableCurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AccountsReceivableNetCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 310<br> -SubTopic 10<br> -Section 45<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=124259787&amp;loc=d3e4428-111522<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(3))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 3: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section 45<br> -Paragraph 1<br> -Subparagraph (c)<br> -URI http://asc.fasb.org/extlink&amp;oid=124098289&amp;loc=d3e6676-107765<br><br>Reference 4: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 310<br> -SubTopic 10<br> -Section 45<br> -Paragraph 9<br> -URI http://asc.fasb.org/extlink&amp;oid=124259787&amp;loc=d3e4531-111522<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AccountsReceivableNetCurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AccruedLiabilitiesCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.20)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AccruedLiabilitiesCurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(30)(a)(4))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 220<br> -SubTopic 10<br> -Section 45<br> -Paragraph 11<br> -URI http://asc.fasb.org/extlink&amp;oid=124509347&amp;loc=d3e637-108580<br><br>Reference 3: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 944<br> -SubTopic 210<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.7-03(a)(23)(a)(3))<br> -URI http://asc.fasb.org/extlink&amp;oid=120400017&amp;loc=d3e572229-122910<br><br>Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 220<br> -SubTopic 10<br> -Section 45<br> -Paragraph 14A<br> -URI http://asc.fasb.org/extlink&amp;oid=124509347&amp;loc=SL7669686-108580<br><br>Reference 5: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 944<br> -SubTopic 40<br> -Section 65<br> -Paragraph 2<br> -Subparagraph (h)(2)<br> -URI http://asc.fasb.org/extlink&amp;oid=124501264&amp;loc=SL117420844-207641<br><br>Reference 6: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 944<br> -SubTopic 40<br> -Section 65<br> -Paragraph 2<br> -Subparagraph (g)(2)(ii)<br> -URI http://asc.fasb.org/extlink&amp;oid=124501264&amp;loc=SL117420844-207641<br><br>Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 220<br> -SubTopic 10<br> -Section 45<br> -Paragraph 14<br> -URI http://asc.fasb.org/extlink&amp;oid=124509347&amp;loc=d3e681-108580<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AdditionalPaidInCapital">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of excess of issue price over par or stated value of stock and from other transaction involving stock or stockholder. Includes, but is not limited to, additional paid-in capital (APIC) for common and preferred stock.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 852<br> -SubTopic 10<br> -Section 55<br> -Paragraph 10<br> -URI http://asc.fasb.org/extlink&amp;oid=84165509&amp;loc=d3e56426-112766<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 65<br> -Paragraph 15<br> -Subparagraph (g)(2)<br> -URI http://asc.fasb.org/extlink&amp;oid=121322162&amp;loc=SL121327923-165333<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(30)(a)(1))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AdditionalPaidInCapital</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_Assets">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 942<br> -SubTopic 210<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.9-03(11))<br> -URI http://asc.fasb.org/extlink&amp;oid=120398452&amp;loc=d3e534808-122878<br><br>Reference 2: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 852<br> -SubTopic 10<br> -Section 55<br> -Paragraph 10<br> -URI http://asc.fasb.org/extlink&amp;oid=84165509&amp;loc=d3e56426-112766<br><br>Reference 3: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1B<br> -Subparagraph (SX 210.13-02(a)(4)(iii)(A))<br> -URI 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-Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1A<br> -Subparagraph (SX 210.13-01(a)(5))<br> -URI http://asc.fasb.org/extlink&amp;oid=124359900&amp;loc=SL124442526-122756<br><br>Reference 11: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1A<br> -Subparagraph (SX 210.13-01(a)(4)(iii)(A))<br> -URI http://asc.fasb.org/extlink&amp;oid=124359900&amp;loc=SL124442526-122756<br><br>Reference 12: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 235<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.4-08(g)(1)(ii))<br> -URI http://asc.fasb.org/extlink&amp;oid=120395691&amp;loc=d3e23780-122690<br><br>Reference 13: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1A<br> -Subparagraph (SX 210.13-01(a)(4)(i))<br> -URI http://asc.fasb.org/extlink&amp;oid=124359900&amp;loc=SL124442526-122756<br><br>Reference 14: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1A<br> -Subparagraph (SX 210.13-01(a)(4)(iii))<br> -URI http://asc.fasb.org/extlink&amp;oid=124359900&amp;loc=SL124442526-122756<br><br>Reference 15: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 825<br> -SubTopic 10<br> -Section 50<br> -Paragraph 28<br> -Subparagraph (f)<br> -URI http://asc.fasb.org/extlink&amp;oid=123596393&amp;loc=d3e14064-108612<br><br>Reference 16: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1B<br> -Subparagraph (SX 210.13-02(a)(4)(iii)(B))<br> -URI http://asc.fasb.org/extlink&amp;oid=124359900&amp;loc=SL124442552-122756<br><br>Reference 17: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 810<br> -SubTopic 10<br> -Section 50<br> -Paragraph 3<br> -Subparagraph (bb)<br> -URI http://asc.fasb.org/extlink&amp;oid=123419778&amp;loc=d3e5710-111685<br><br>Reference 18: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1B<br> -Subparagraph (SX 210.13-02(a)(5))<br> -URI http://asc.fasb.org/extlink&amp;oid=124359900&amp;loc=SL124442552-122756<br><br>Reference 19: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 810<br> -SubTopic 10<br> -Section 45<br> -Paragraph 25<br> -Subparagraph (a)<br> -URI 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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_Assets</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AssetsCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Sum of the carrying amounts as of the balance sheet date of all assets that are expected to be realized in cash, sold, or consumed within one year (or the normal operating cycle, if longer). Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section 45<br> -Paragraph 3<br> -URI http://asc.fasb.org/extlink&amp;oid=124098289&amp;loc=d3e6801-107765<br><br>Reference 2: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 852<br> -SubTopic 10<br> -Section 55<br> -Paragraph 10<br> -URI http://asc.fasb.org/extlink&amp;oid=84165509&amp;loc=d3e56426-112766<br><br>Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 852<br> -SubTopic 10<br> -Section 50<br> -Paragraph 7<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=124433192&amp;loc=SL2890621-112765<br><br>Reference 4: 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-Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1A<br> -Subparagraph (SX 210.13-01(a)(4)(iii)(A))<br> -URI http://asc.fasb.org/extlink&amp;oid=124359900&amp;loc=SL124442526-122756<br><br>Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1A<br> -Subparagraph (SX 210.13-01(a)(4)(iii))<br> -URI http://asc.fasb.org/extlink&amp;oid=124359900&amp;loc=SL124442526-122756<br><br>Reference 9: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 825<br> -SubTopic 10<br> -Section 50<br> -Paragraph 28<br> -Subparagraph (f)<br> -URI http://asc.fasb.org/extlink&amp;oid=123596393&amp;loc=d3e14064-108612<br><br>Reference 10: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1A<br> -Subparagraph (SX 210.13-01(a)(5))<br> -URI http://asc.fasb.org/extlink&amp;oid=124359900&amp;loc=SL124442526-122756<br><br>Reference 11: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1B<br> -Subparagraph (SX 210.13-02(a)(4)(iv))<br> -URI http://asc.fasb.org/extlink&amp;oid=124359900&amp;loc=SL124442552-122756<br><br>Reference 12: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 810<br> -SubTopic 10<br> -Section 45<br> -Paragraph 25<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=116870748&amp;loc=SL6758485-165988<br><br>Reference 13: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1B<br> -Subparagraph (SX 210.13-02(a)(4)(iii)(B))<br> -URI http://asc.fasb.org/extlink&amp;oid=124359900&amp;loc=SL124442552-122756<br><br>Reference 14: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 323<br> -SubTopic 10<br> -Section 50<br> -Paragraph 3<br> -Subparagraph (c)<br> -URI http://asc.fasb.org/extlink&amp;oid=114001798&amp;loc=d3e33918-111571<br><br>Reference 15: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1A<br> -Subparagraph (SX 210.13-01(a)(4)(ii))<br> -URI http://asc.fasb.org/extlink&amp;oid=124359900&amp;loc=SL124442526-122756<br><br>Reference 16: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1B<br> -Subparagraph (SX 210.13-02(a)(5))<br> -URI http://asc.fasb.org/extlink&amp;oid=124359900&amp;loc=SL124442552-122756<br><br>Reference 17: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 810<br> -SubTopic 10<br> -Section 50<br> -Paragraph 3<br> -Subparagraph (bb)<br> -URI http://asc.fasb.org/extlink&amp;oid=123419778&amp;loc=d3e5710-111685<br><br>Reference 18: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1A<br> -Subparagraph (SX 210.13-01(a)(4)(iv))<br> -URI http://asc.fasb.org/extlink&amp;oid=124359900&amp;loc=SL124442526-122756<br><br>Reference 19: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 235<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.4-08(g)(1)(ii))<br> -URI http://asc.fasb.org/extlink&amp;oid=120395691&amp;loc=d3e23780-122690<br><br>Reference 20: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section 45<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=124098289&amp;loc=d3e6676-107765<br><br>Reference 21: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1B<br> -Subparagraph (SX 210.13-02(a)(4)(i))<br> -URI http://asc.fasb.org/extlink&amp;oid=124359900&amp;loc=SL124442552-122756<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AssetsCurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AssetsCurrentAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AssetsCurrentAbstract</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_BusinessCombinationContingentConsiderationLiabilityCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of liability recognized arising from contingent consideration in a business combination, expected to be settled within one year or the normal operating cycle, if longer.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 805<br> -SubTopic 30<br> -Section 25<br> -Paragraph 6<br> -URI http://asc.fasb.org/extlink&amp;oid=6911189&amp;loc=d3e6408-128476<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 805<br> -SubTopic 30<br> -Section 35<br> -Paragraph 1<br> -Subparagraph b<br> -URI http://asc.fasb.org/extlink&amp;oid=116859824&amp;loc=d3e6819-128478<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_BusinessCombinationContingentConsiderationLiabilityCurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_CashAndCashEquivalentsAtCarryingValue">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 4<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3044-108585<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section 45<br> -Paragraph 1<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=124098289&amp;loc=d3e6676-107765<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.1)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_CashAndCashEquivalentsAtCarryingValue</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_CommitmentsAndContingencies">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Represents the caption on the face of the balance sheet to indicate that the entity has entered into (1) purchase or supply arrangements that will require expending a portion of its resources to meet the terms thereof, and (2) is exposed to potential losses or, less frequently, gains, arising from (a) possible claims against a company's resources due to future performance under contract terms, and (b) possible losses or likely gains from uncertainties that will ultimately be resolved when one or more future events that are deemed likely to occur do occur or fail to occur.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.25)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 944<br> -SubTopic 210<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.7-03.(a),19)<br> -URI http://asc.fasb.org/extlink&amp;oid=120400017&amp;loc=d3e572229-122910<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 942<br> -SubTopic 210<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.9-03.17)<br> -URI http://asc.fasb.org/extlink&amp;oid=120398452&amp;loc=d3e534808-122878<br><br>Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 450<br> -SubTopic 20<br> -Section 50<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=121557415&amp;loc=d3e14326-108349<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_CommitmentsAndContingencies</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_CommonStockValue">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 852<br> -SubTopic 10<br> -Section 55<br> -Paragraph 10<br> -URI http://asc.fasb.org/extlink&amp;oid=84165509&amp;loc=d3e56426-112766<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(29))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_CommonStockValue</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ContractWithCustomerAssetNetCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 606<br> -SubTopic 10<br> -Section 45<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=123360276&amp;loc=SL49130531-203044<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 606<br> -SubTopic 10<br> -Section 45<br> -Paragraph 3<br> -URI http://asc.fasb.org/extlink&amp;oid=123360276&amp;loc=SL49130533-203044<br><br>Reference 3: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 606<br> -SubTopic 10<br> -Section 50<br> -Paragraph 8<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123351226&amp;loc=SL49130549-203045<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ContractWithCustomerAssetNetCurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ContractWithCustomerLiabilityCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 606<br> -SubTopic 10<br> -Section 45<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=123360276&amp;loc=SL49130531-203044<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 606<br> -SubTopic 10<br> -Section 45<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=123360276&amp;loc=SL49130532-203044<br><br>Reference 3: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 606<br> -SubTopic 10<br> -Section 50<br> -Paragraph 8<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123351226&amp;loc=SL49130549-203045<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ContractWithCustomerLiabilityCurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_Goodwill">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 942<br> -SubTopic 210<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.9-03(10)(1))<br> -URI http://asc.fasb.org/extlink&amp;oid=120398452&amp;loc=d3e534808-122878<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 350<br> -SubTopic 20<br> -Section 45<br> -Paragraph 5<br> -URI http://asc.fasb.org/extlink&amp;oid=120320667&amp;loc=SL49117168-202975<br><br>Reference 3: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 852<br> -SubTopic 10<br> -Section 55<br> -Paragraph 10<br> -URI http://asc.fasb.org/extlink&amp;oid=84165509&amp;loc=d3e56426-112766<br><br>Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 350<br> -SubTopic 20<br> -Section 45<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=99380562&amp;loc=d3e13770-109266<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_Goodwill</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_IntangibleAssetsNetExcludingGoodwill">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 350<br> -SubTopic 30<br> -Section 50<br> -Paragraph 2<br> -Subparagraph ((a)(1),(b))<br> -URI http://asc.fasb.org/extlink&amp;oid=66006027&amp;loc=d3e16323-109275<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 350<br> -SubTopic 30<br> -Section 45<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=6388964&amp;loc=d3e16212-109274<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_IntangibleAssetsNetExcludingGoodwill</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_InventoryNet">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section 45<br> -Paragraph 1<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=124098289&amp;loc=d3e6676-107765<br><br>Reference 2: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 852<br> -SubTopic 10<br> -Section 55<br> -Paragraph 10<br> -URI http://asc.fasb.org/extlink&amp;oid=84165509&amp;loc=d3e56426-112766<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.6(a))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_InventoryNet</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_Liabilities">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.19-26)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 852<br> -SubTopic 10<br> -Section 50<br> -Paragraph 7<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=124433192&amp;loc=SL2890621-112765<br><br>Reference 3: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 30<br> -Subparagraph (d)<br> -URI 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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_Liabilities</td>
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<tr>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of liabilities and equity items, including the portion of equity attributable to noncontrolling interests, if any.</p></div>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_LiabilitiesAndStockholdersEquity</td>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Total obligations incurred as part of normal operations that are expected to be paid during the following twelve months or within one business cycle, if longer.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 852<br> -SubTopic 10<br> -Section 55<br> -Paragraph 10<br> -URI http://asc.fasb.org/extlink&amp;oid=84165509&amp;loc=d3e56426-112766<br><br>Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 852<br> -SubTopic 10<br> -Section 50<br> -Paragraph 7<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=124433192&amp;loc=SL2890621-112765<br><br>Reference 3: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1B<br> -Subparagraph (SX 210.13-02(a)(4)(iii)(A))<br> -URI 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-Subparagraph (f)<br> -URI http://asc.fasb.org/extlink&amp;oid=123596393&amp;loc=d3e14064-108612<br><br>Reference 20: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.21)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_LiabilitiesCurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<td><strong> Data Type:</strong></td>
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<td><strong> Period Type:</strong></td>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_LiabilitiesCurrentAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_LiabilitiesCurrentAbstract</td>
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<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<tr>
<td><strong> Balance Type:</strong></td>
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<td><strong> Period Type:</strong></td>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_LitigationReserveCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Carrying amount of reserve for known or estimated probable loss from litigation, which may include attorneys' fees and other litigation costs, which is expected to be paid within one year of the date of the statement of financial position.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.25)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 450<br> -SubTopic 20<br> -Section 55<br> -Paragraph 11<br> -URI http://asc.fasb.org/extlink&amp;oid=116646759&amp;loc=d3e15243-108350<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 450<br> -SubTopic 20<br> -Section 50<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=121557415&amp;loc=d3e14326-108349<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_LitigationReserveCurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_LongTermDebtCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.19,20)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_LongTermDebtCurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_LongTermDebtNoncurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.22)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_LongTermDebtNoncurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_OperatingLeaseLiabilityCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Present value of lessee's discounted obligation for lease payments from operating lease, classified as current.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 45<br> -Paragraph 1<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=123391704&amp;loc=SL77918627-209977<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OperatingLeaseLiabilityCurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_OperatingLeaseLiabilityNoncurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 45<br> -Paragraph 1<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=123391704&amp;loc=SL77918627-209977<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OperatingLeaseLiabilityNoncurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_OperatingLeaseRightOfUseAsset">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of lessee's right to use underlying asset under operating lease.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 45<br> -Paragraph 1<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123391704&amp;loc=SL77918627-209977<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OperatingLeaseRightOfUseAsset</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_OtherAssetsCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of current assets classified as other.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.8)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 2: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 852<br> -SubTopic 10<br> -Section 55<br> -Paragraph 10<br> -URI http://asc.fasb.org/extlink&amp;oid=84165509&amp;loc=d3e56426-112766<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OtherAssetsCurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_PreferredStockValue">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Aggregate par or stated value of issued nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable preferred shares, par value and other disclosure concepts are in another section within stockholders' equity.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(28))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 2: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 852<br> -SubTopic 10<br> -Section 55<br> -Paragraph 10<br> -URI http://asc.fasb.org/extlink&amp;oid=84165509&amp;loc=d3e56426-112766<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_PreferredStockValue</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_PropertyPlantAndEquipmentNet">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(14))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 360<br> -SubTopic 10<br> -Section 50<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=6391035&amp;loc=d3e2868-110229<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 944<br> -SubTopic 210<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.7-03(a)(8))<br> -URI http://asc.fasb.org/extlink&amp;oid=120400017&amp;loc=d3e572229-122910<br><br>Reference 4: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 942<br> -SubTopic 360<br> -Section 50<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=124429447&amp;loc=SL124453093-239630<br><br>Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(13))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 6: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 852<br> -SubTopic 10<br> -Section 55<br> -Paragraph 10<br> -URI http://asc.fasb.org/extlink&amp;oid=84165509&amp;loc=d3e56426-112766<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_PropertyPlantAndEquipmentNet</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_RestrictedCashCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of cash restricted as to withdrawal or usage, classified as current. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 50<br> -Paragraph 8<br> -URI http://asc.fasb.org/extlink&amp;oid=123431023&amp;loc=SL98516268-108586<br><br>Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(1))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section 45<br> -Paragraph 1<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=124098289&amp;loc=d3e6676-107765<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_RestrictedCashCurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_RestrictedCashNoncurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of cash restricted as to withdrawal or usage, classified as noncurrent. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section 45<br> -Paragraph 4<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=124098289&amp;loc=d3e6812-107765<br><br>Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(17))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 50<br> -Paragraph 8<br> -URI http://asc.fasb.org/extlink&amp;oid=123431023&amp;loc=SL98516268-108586<br><br>Reference 4: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 954<br> -SubTopic 210<br> -Section 45<br> -Paragraph 5<br> -URI http://asc.fasb.org/extlink&amp;oid=120413173&amp;loc=SL116631458-115580<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_RestrictedCashNoncurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_RetainedEarningsAccumulatedDeficit">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The cumulative amount of the reporting entity's undistributed earnings or deficit.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(30)(a)(3))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 2: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 852<br> -SubTopic 10<br> -Section 55<br> -Paragraph 10<br> -URI http://asc.fasb.org/extlink&amp;oid=84165509&amp;loc=d3e56426-112766<br><br>Reference 3: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 65<br> -Paragraph 15<br> -Subparagraph (g)(2)<br> -URI http://asc.fasb.org/extlink&amp;oid=121322162&amp;loc=SL121327923-165333<br><br>Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 944<br> -SubTopic 210<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.7-03(a)(23)(a)(4))<br> -URI http://asc.fasb.org/extlink&amp;oid=120400017&amp;loc=d3e572229-122910<br><br>Reference 5: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 944<br> -SubTopic 40<br> -Section 65<br> -Paragraph 2<br> -Subparagraph (h)(2)<br> -URI http://asc.fasb.org/extlink&amp;oid=124501264&amp;loc=SL117420844-207641<br><br>Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.3-04)<br> -URI http://asc.fasb.org/extlink&amp;oid=120397183&amp;loc=d3e187085-122770<br><br>Reference 7: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 944<br> -SubTopic 40<br> -Section 65<br> -Paragraph 2<br> -Subparagraph (g)(2)(i)<br> -URI http://asc.fasb.org/extlink&amp;oid=124501264&amp;loc=SL117420844-207641<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_RetainedEarningsAccumulatedDeficit</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_StockholdersEquity">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 235<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.4-08(g)(1)(ii))<br> -URI http://asc.fasb.org/extlink&amp;oid=120395691&amp;loc=d3e23780-122690<br><br>Reference 2: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 852<br> -SubTopic 10<br> -Section 55<br> -Paragraph 10<br> -URI http://asc.fasb.org/extlink&amp;oid=84165509&amp;loc=d3e56426-112766<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 310<br> -SubTopic 10<br> -Section S99<br> -Paragraph 2<br> -Subparagraph (SAB Topic 4.E)<br> -URI http://asc.fasb.org/extlink&amp;oid=122038336&amp;loc=d3e74512-122707<br><br>Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(31))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(29))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(30))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 825<br> -SubTopic 10<br> -Section 50<br> -Paragraph 28<br> -Subparagraph (f)<br> -URI http://asc.fasb.org/extlink&amp;oid=123596393&amp;loc=d3e14064-108612<br><br>Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 323<br> -SubTopic 10<br> -Section 50<br> -Paragraph 3<br> -Subparagraph (c)<br> -URI http://asc.fasb.org/extlink&amp;oid=114001798&amp;loc=d3e33918-111571<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_StockholdersEquity</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_StockholdersEquityAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_StockholdersEquityAbstract</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
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<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
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<td><strong> Balance Type:</strong></td>
<td>na</td>
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<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_TreasuryStockValue">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 30<br> -Section 50<br> -Paragraph 4<br> -URI http://asc.fasb.org/extlink&amp;oid=6405834&amp;loc=d3e23315-112656<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.29,30)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 30<br> -Section 45<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=6405813&amp;loc=d3e23239-112655<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_TreasuryStockValue</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
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<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
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<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
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<span style="display: none;">v3.22.0.1</span><table class="report" border="0" cellspacing="2" id="idm140163161859064">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Consolidated Balance Sheets (Parenthetical) - $ / shares<br></strong></div></th>
<th class="th"><div>Jan. 31, 2022</div></th>
<th class="th"><div>Apr. 30, 2021</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StatementOfFinancialPositionAbstract', window );"><strong>Statement of Financial Position [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PreferredStockParOrStatedValuePerShare', window );">Preferred stock, par value</a></td>
<td class="nump">$ 0.001<span></span>
</td>
<td class="nump">$ 0.001<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PreferredStockSharesAuthorized', window );">Preferred stock, shares authorized</a></td>
<td class="nump">5,000,000<span></span>
</td>
<td class="nump">5,000,000<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PreferredStockSharesIssued', window );">Preferred stock, shares issued</a></td>
<td class="nump">0<span></span>
</td>
<td class="nump">0<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PreferredStockSharesOutstanding', window );">Preferred stock, shares outstanding</a></td>
<td class="nump">0<span></span>
</td>
<td class="nump">0<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CommonStockParOrStatedValuePerShare', window );">Common stock, par value</a></td>
<td class="nump">$ 0.001<span></span>
</td>
<td class="nump">$ 0.001<span></span>
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<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CommonStockSharesAuthorized', window );">Common stock, shares authorized</a></td>
<td class="nump">100,000,000<span></span>
</td>
<td class="nump">100,000,000<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CommonStockSharesIssued', window );">Common stock, shares issued</a></td>
<td class="nump">55,894,213<span></span>
</td>
<td class="nump">52,458,011<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TreasuryStockShares', window );">Treasury stock, shares</a></td>
<td class="nump">21,040<span></span>
</td>
<td class="nump">21,040<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_CommonStockParOrStatedValuePerShare">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Face amount or stated value per share of common stock.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(29))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_CommonStockParOrStatedValuePerShare</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dtr-types:perShareItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_CommonStockSharesAuthorized">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The maximum number of common shares permitted to be issued by an entity's charter and bylaws.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(29))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_CommonStockSharesAuthorized</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
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<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
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<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
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<tr>
<td><strong> Period Type:</strong></td>
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</tr>
</table></div>
</div></td></tr>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_CommonStockSharesIssued">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(29))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_CommonStockSharesIssued</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_PreferredStockParOrStatedValuePerShare">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(28))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section 50<br> -Paragraph 13<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123467817&amp;loc=SL123496158-112644<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_PreferredStockParOrStatedValuePerShare</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dtr-types:perShareItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_PreferredStockSharesAuthorized">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(28))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_PreferredStockSharesAuthorized</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_PreferredStockSharesIssued">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(28))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section 50<br> -Paragraph 13<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123467817&amp;loc=SL123496158-112644<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_PreferredStockSharesIssued</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_PreferredStockSharesOutstanding">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(28))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_PreferredStockSharesOutstanding</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_StatementOfFinancialPositionAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_StatementOfFinancialPositionAbstract</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_TreasuryStockShares">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.29,30)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 30<br> -Section 45<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=6405813&amp;loc=d3e23239-112655<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_TreasuryStockShares</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
</div>
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<span style="display: none;">v3.22.0.1</span><table class="report" border="0" cellspacing="2" id="idm140163162783448">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Consolidated Statements of Operations (Unaudited) - USD ($)<br> shares in Thousands, $ in Thousands</strong></div></th>
<th class="th" colspan="2">3 Months Ended</th>
<th class="th" colspan="2">9 Months Ended</th>
</tr>
<tr>
<th class="th"><div>Jan. 31, 2022</div></th>
<th class="th"><div>Jan. 31, 2021</div></th>
<th class="th"><div>Jan. 31, 2022</div></th>
<th class="th"><div>Jan. 31, 2021</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_IncomeStatementAbstract', window );"><strong>Income Statement [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax', window );">Revenues</a></td>
<td class="nump">$ 484<span></span>
</td>
<td class="nump">$ 317<span></span>
</td>
<td class="nump">$ 1,003<span></span>
</td>
<td class="nump">$ 604<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CostOfRevenue', window );">Cost of revenues</a></td>
<td class="nump">597<span></span>
</td>
<td class="nump">698<span></span>
</td>
<td class="nump">1,320<span></span>
</td>
<td class="nump">1,248<span></span>
</td>
</tr>
<tr class="rou">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_GrossProfit', window );">Gross loss</a></td>
<td class="num">(113)<span></span>
</td>
<td class="num">(381)<span></span>
</td>
<td class="num">(317)<span></span>
</td>
<td class="num">(644)<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OperatingExpensesAbstract', window );"><strong>Operating expenses:</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost', window );">Engineering and product development costs</a></td>
<td class="nump">2,465<span></span>
</td>
<td class="nump">1,019<span></span>
</td>
<td class="nump">7,518<span></span>
</td>
<td class="nump">3,334<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SellingGeneralAndAdministrativeExpense', window );">Selling, general and administrative costs</a></td>
<td class="nump">2,974<span></span>
</td>
<td class="nump">1,763<span></span>
</td>
<td class="nump">7,933<span></span>
</td>
<td class="nump">5,591<span></span>
</td>
</tr>
<tr class="rou">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OperatingExpenses', window );">Total operating expenses</a></td>
<td class="nump">5,439<span></span>
</td>
<td class="nump">2,782<span></span>
</td>
<td class="nump">15,451<span></span>
</td>
<td class="nump">8,925<span></span>
</td>
</tr>
<tr class="reu">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OperatingIncomeLoss', window );">Operating loss</a></td>
<td class="num">(5,552)<span></span>
</td>
<td class="num">(3,163)<span></span>
</td>
<td class="num">(15,768)<span></span>
</td>
<td class="num">(9,569)<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_InterestIncomeExpenseNet', window );">Interest income, net</a></td>
<td class="nump">16<span></span>
</td>
<td class="nump">25<span></span>
</td>
<td class="nump">56<span></span>
</td>
<td class="nump">45<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OtherNonoperatingIncomeExpense', window );">Other income (expense), net</a></td>
<td class="nump">60<span></span>
</td>
<td class="num">(16)<span></span>
</td>
<td class="nump">60<span></span>
</td>
<td class="num">(49)<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_GainsLossesOnExtinguishmentOfDebt', window );">Gain on extinguishment of PPP loan</a></td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">890<span></span>
</td>
<td class="text"> <span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ForeignCurrencyTransactionGainLossBeforeTax', window );">Foreign exchange gain</a></td>
<td class="nump">5<span></span>
</td>
<td class="nump">3<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">13<span></span>
</td>
</tr>
<tr class="rou">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest', window );">Loss before income taxes</a></td>
<td class="num">(5,471)<span></span>
</td>
<td class="num">(3,151)<span></span>
</td>
<td class="num">(14,762)<span></span>
</td>
<td class="num">(9,560)<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_IncomeTaxExpenseBenefit', window );">Income tax benefit</a></td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">1,041<span></span>
</td>
<td class="text"> <span></span>
</td>
</tr>
<tr class="rou">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_NetIncomeLoss', window );">Net loss</a></td>
<td class="num">$ (5,471)<span></span>
</td>
<td class="num">$ (3,151)<span></span>
</td>
<td class="num">$ (13,721)<span></span>
</td>
<td class="num">$ (9,560)<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_EarningsPerShareBasicAndDiluted', window );">Basic and diluted net loss per common share</a></td>
<td class="num">$ (0.10)<span></span>
</td>
<td class="num">$ (0.09)<span></span>
</td>
<td class="num">$ (0.26)<span></span>
</td>
<td class="num">$ (0.41)<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted', window );">Weighted average common shares used to compute basic and diluted net loss per common share</a></td>
<td class="nump">55,308,799<span></span>
</td>
<td class="nump">33,715,334<span></span>
</td>
<td class="nump">53,408,998<span></span>
</td>
<td class="nump">23,160,885<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_CostOfRevenue">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The aggregate cost of goods produced and sold and services rendered during the reporting period.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1B<br> -Subparagraph (SX 210.13-02(a)(5))<br> -URI http://asc.fasb.org/extlink&amp;oid=124359900&amp;loc=SL124442552-122756<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 825<br> -SubTopic 10<br> -Section 50<br> -Paragraph 28<br> -Subparagraph (f)<br> -URI http://asc.fasb.org/extlink&amp;oid=123596393&amp;loc=d3e14064-108612<br><br>Reference 3: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 235<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.4-08(g)(1)(ii))<br> -URI http://asc.fasb.org/extlink&amp;oid=120395691&amp;loc=d3e23780-122690<br><br>Reference 4: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1A<br> -Subparagraph (SX 210.13-01(a)(4)(iv))<br> -URI http://asc.fasb.org/extlink&amp;oid=124359900&amp;loc=SL124442526-122756<br><br>Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 220<br> -SubTopic 10<br> -Section S99<br> -Paragraph 2<br> -Subparagraph (SX 210.5-03.2)<br> -URI http://asc.fasb.org/extlink&amp;oid=123367319&amp;loc=SL114868664-224227<br><br>Reference 6: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 323<br> -SubTopic 10<br> -Section 50<br> -Paragraph 3<br> -Subparagraph (c)<br> -URI http://asc.fasb.org/extlink&amp;oid=114001798&amp;loc=d3e33918-111571<br><br>Reference 7: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1A<br> -Subparagraph (SX 210.13-01(a)(5))<br> -URI http://asc.fasb.org/extlink&amp;oid=124359900&amp;loc=SL124442526-122756<br><br>Reference 8: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1B<br> -Subparagraph (SX 210.13-02(a)(4)(i))<br> -URI http://asc.fasb.org/extlink&amp;oid=124359900&amp;loc=SL124442552-122756<br><br>Reference 9: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1B<br> -Subparagraph (SX 210.13-02(a)(4)(iii)(B))<br> -URI http://asc.fasb.org/extlink&amp;oid=124359900&amp;loc=SL124442552-122756<br><br>Reference 10: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1B<br> -Subparagraph (SX 210.13-02(a)(4)(iii)(A))<br> -URI http://asc.fasb.org/extlink&amp;oid=124359900&amp;loc=SL124442552-122756<br><br>Reference 11: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1A<br> -Subparagraph (SX 210.13-01(a)(4)(i))<br> -URI http://asc.fasb.org/extlink&amp;oid=124359900&amp;loc=SL124442526-122756<br><br>Reference 12: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1A<br> -Subparagraph (SX 210.13-01(a)(4)(iii)(A))<br> -URI http://asc.fasb.org/extlink&amp;oid=124359900&amp;loc=SL124442526-122756<br><br>Reference 13: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1A<br> -Subparagraph (SX 210.13-01(a)(4)(ii))<br> -URI http://asc.fasb.org/extlink&amp;oid=124359900&amp;loc=SL124442526-122756<br><br>Reference 14: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1B<br> -Subparagraph (SX 210.13-02(a)(4)(iv))<br> -URI http://asc.fasb.org/extlink&amp;oid=124359900&amp;loc=SL124442552-122756<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_CostOfRevenue</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_EarningsPerShareBasicAndDiluted">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements.  Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period.  Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 260<br> -SubTopic 10<br> -Section 45<br> -Paragraph 7<br> -URI http://asc.fasb.org/extlink&amp;oid=125511455&amp;loc=d3e1337-109256<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_EarningsPerShareBasicAndDiluted</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dtr-types:perShareItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ForeignCurrencyTransactionGainLossBeforeTax">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 830<br> -SubTopic 20<br> -Section 45<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=125521441&amp;loc=d3e30690-110894<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 830<br> -SubTopic 20<br> -Section 35<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=123602790&amp;loc=d3e30226-110892<br><br>Reference 3: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 830<br> -SubTopic 10<br> -Section 45<br> -Paragraph 17<br> -URI http://asc.fasb.org/extlink&amp;oid=120253306&amp;loc=d3e28228-110885<br><br>Reference 4: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 830<br> -SubTopic 20<br> -Section 50<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=124440516&amp;loc=d3e30840-110895<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ForeignCurrencyTransactionGainLossBeforeTax</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_GainsLossesOnExtinguishmentOfDebt">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 50<br> -Section 40<br> -Paragraph 4<br> -URI http://asc.fasb.org/extlink&amp;oid=123467658&amp;loc=d3e12355-112629<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 50<br> -Section 40<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=123467658&amp;loc=d3e12317-112629<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 28<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3602-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_GainsLossesOnExtinguishmentOfDebt</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_GrossProfit">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 31<br> -URI http://asc.fasb.org/extlink&amp;oid=123359005&amp;loc=d3e8924-108599<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 30<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=123359005&amp;loc=d3e8906-108599<br><br>Reference 3: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 22<br> -URI http://asc.fasb.org/extlink&amp;oid=123359005&amp;loc=d3e8736-108599<br><br>Reference 4: 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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_GrossProfit</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 32<br> -Subparagraph (c)<br> -URI http://asc.fasb.org/extlink&amp;oid=123359005&amp;loc=d3e8933-108599<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 30<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=123359005&amp;loc=d3e8906-108599<br><br>Reference 3: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 32<br> -Subparagraph (f)<br> -URI http://asc.fasb.org/extlink&amp;oid=123359005&amp;loc=d3e8933-108599<br><br>Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 940<br> -SubTopic 20<br> -Section 25<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=123384075&amp;loc=d3e41242-110953<br><br>Reference 5: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 22<br> -URI http://asc.fasb.org/extlink&amp;oid=123359005&amp;loc=d3e8736-108599<br><br>Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 220<br> -SubTopic 10<br> -Section S99<br> -Paragraph 2<br> -Subparagraph (SX 210.5-03(10))<br> -URI http://asc.fasb.org/extlink&amp;oid=123367319&amp;loc=SL114868664-224227<br><br>Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 944<br> -SubTopic 220<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.7-04(8))<br> -URI http://asc.fasb.org/extlink&amp;oid=120400993&amp;loc=SL114874131-224263<br><br>Reference 8: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 942<br> -SubTopic 235<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.9-05(b)(2))<br> -URI http://asc.fasb.org/extlink&amp;oid=120399901&amp;loc=d3e537907-122884<br><br>Reference 9: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 31<br> -URI http://asc.fasb.org/extlink&amp;oid=123359005&amp;loc=d3e8924-108599<br><br>Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 942<br> -SubTopic 220<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.9-04(15))<br> -URI http://asc.fasb.org/extlink&amp;oid=120399700&amp;loc=SL114874048-224260<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_IncomeStatementAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_IncomeStatementAbstract</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_IncomeTaxExpenseBenefit">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 740<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SAB TOPIC 6.I.7)<br> -URI http://asc.fasb.org/extlink&amp;oid=122134291&amp;loc=d3e330036-122817<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 740<br> -SubTopic 10<br> -Section 50<br> -Paragraph 10<br> -URI http://asc.fasb.org/extlink&amp;oid=121826272&amp;loc=d3e32672-109319<br><br>Reference 3: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 22<br> -Subparagraph (h)<br> -URI http://asc.fasb.org/extlink&amp;oid=123359005&amp;loc=d3e8736-108599<br><br>Reference 4: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 235<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.4-08(h))<br> -URI http://asc.fasb.org/extlink&amp;oid=120395691&amp;loc=d3e23780-122690<br><br>Reference 5: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 250<br> -SubTopic 10<br> -Section 50<br> -Paragraph 9<br> -URI http://asc.fasb.org/extlink&amp;oid=124431687&amp;loc=d3e22663-107794<br><br>Reference 6: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 740<br> -SubTopic 20<br> -Section 45<br> -Paragraph 2<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123586238&amp;loc=d3e38679-109324<br><br>Reference 7: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 944<br> -SubTopic 220<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.7-04(9))<br> -URI http://asc.fasb.org/extlink&amp;oid=120400993&amp;loc=SL114874131-224263<br><br>Reference 8: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 250<br> -SubTopic 10<br> -Section 50<br> -Paragraph 8<br> -URI http://asc.fasb.org/extlink&amp;oid=124431687&amp;loc=d3e22658-107794<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_IncomeTaxExpenseBenefit</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_InterestIncomeExpenseNet">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The net amount of operating interest income (expense).</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 942<br> -SubTopic 220<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.9-04.10)<br> -URI http://asc.fasb.org/extlink&amp;oid=120399700&amp;loc=SL114874048-224260<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_InterestIncomeExpenseNet</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
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</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_NetIncomeLoss">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.</p></div>
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http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 22<br> -URI http://asc.fasb.org/extlink&amp;oid=123359005&amp;loc=d3e8736-108599<br><br>Reference 31: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1A<br> -Subparagraph (SX 210.13-01(a)(5))<br> -URI http://asc.fasb.org/extlink&amp;oid=124359900&amp;loc=SL124442526-122756<br><br>Reference 32: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1B<br> -Subparagraph (SX 210.13-02(a)(4)(iii)(B))<br> -URI http://asc.fasb.org/extlink&amp;oid=124359900&amp;loc=SL124442552-122756<br><br>Reference 33: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1B<br> -Subparagraph (SX 210.13-02(a)(4)(iii)(A))<br> -URI http://asc.fasb.org/extlink&amp;oid=124359900&amp;loc=SL124442552-122756<br><br>Reference 34: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 30<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=123359005&amp;loc=d3e8906-108599<br><br>Reference 35: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 32<br> -Subparagraph (c)<br> -URI http://asc.fasb.org/extlink&amp;oid=123359005&amp;loc=d3e8933-108599<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_NetIncomeLoss</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
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<td><strong> Data Type:</strong></td>
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<tr>
<td><strong> Balance Type:</strong></td>
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<td><strong> Period Type:</strong></td>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_OperatingExpenses">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Includes selling, general and administrative expense.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OperatingExpenses</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
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<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_OperatingExpensesAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OperatingExpensesAbstract</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_OperatingIncomeLoss">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The net result for the period of deducting operating expenses from operating revenues.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 31<br> -URI http://asc.fasb.org/extlink&amp;oid=123359005&amp;loc=d3e8924-108599<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 30<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=123359005&amp;loc=d3e8906-108599<br><br>Reference 3: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 32<br> -Subparagraph (c)<br> -URI http://asc.fasb.org/extlink&amp;oid=123359005&amp;loc=d3e8933-108599<br><br>Reference 4: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 32<br> -Subparagraph (f)<br> -URI http://asc.fasb.org/extlink&amp;oid=123359005&amp;loc=d3e8933-108599<br><br>Reference 5: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 22<br> -URI http://asc.fasb.org/extlink&amp;oid=123359005&amp;loc=d3e8736-108599<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OperatingIncomeLoss</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_OtherNonoperatingIncomeExpense">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of income (expense) related to nonoperating activities, classified as other.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 220<br> -SubTopic 10<br> -Section S99<br> -Paragraph 2<br> -Subparagraph (SX 210.5-03.9)<br> -URI http://asc.fasb.org/extlink&amp;oid=123367319&amp;loc=SL114868664-224227<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OtherNonoperatingIncomeExpense</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The costs incurred in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, excluding in-process research and development acquired in a business combination consummated during the period. Excludes software research and development, which has a separate concept.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 730<br> -SubTopic 10<br> -Section 50<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=6420194&amp;loc=d3e21568-108373<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 30<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123359005&amp;loc=d3e8906-108599<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 40<br> -URI http://asc.fasb.org/extlink&amp;oid=123359005&amp;loc=d3e9031-108599<br><br>Reference 3: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 41<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123359005&amp;loc=d3e9038-108599<br><br>Reference 4: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 32<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=123359005&amp;loc=d3e8933-108599<br><br>Reference 5: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 32<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123359005&amp;loc=d3e8933-108599<br><br>Reference 6: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 606<br> -SubTopic 10<br> -Section 50<br> -Paragraph 4<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123351226&amp;loc=SL49130543-203045<br><br>Reference 7: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 22<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=123359005&amp;loc=d3e8736-108599<br><br>Reference 8: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 22<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123359005&amp;loc=d3e8736-108599<br><br>Reference 9: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 42<br> -URI http://asc.fasb.org/extlink&amp;oid=123359005&amp;loc=d3e9054-108599<br><br>Reference 10: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 606<br> -SubTopic 10<br> -Section 50<br> -Paragraph 5<br> -URI http://asc.fasb.org/extlink&amp;oid=123351226&amp;loc=SL49130545-203045<br><br>Reference 11: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 924<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SAB Topic 11.L)<br> -URI http://asc.fasb.org/extlink&amp;oid=6472922&amp;loc=d3e499488-122856<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_SellingGeneralAndAdministrativeExpense">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 220<br> -SubTopic 10<br> -Section S99<br> -Paragraph 2<br> -Subparagraph (SX 210.5-03.4)<br> -URI http://asc.fasb.org/extlink&amp;oid=123367319&amp;loc=SL114868664-224227<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_SellingGeneralAndAdministrativeExpense</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Average number of shares or units issued and outstanding that are used in calculating basic and diluted earnings per share (EPS).</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
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<span style="display: none;">v3.22.0.1</span><table class="report" border="0" cellspacing="2" id="idm140163162570232">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($)<br> $ in Thousands</strong></div></th>
<th class="th" colspan="2">3 Months Ended</th>
<th class="th" colspan="2">9 Months Ended</th>
</tr>
<tr>
<th class="th"><div>Jan. 31, 2022</div></th>
<th class="th"><div>Jan. 31, 2021</div></th>
<th class="th"><div>Jan. 31, 2022</div></th>
<th class="th"><div>Jan. 31, 2021</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_IncomeStatementAbstract', window );"><strong>Income Statement [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_NetIncomeLoss', window );">Net loss</a></td>
<td class="num">$ (5,471)<span></span>
</td>
<td class="num">$ (3,151)<span></span>
</td>
<td class="num">$ (13,721)<span></span>
</td>
<td class="num">$ (9,560)<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax', window );">Foreign currency translation adjustment</a></td>
<td class="num">(1)<span></span>
</td>
<td class="num">(2)<span></span>
</td>
<td class="num">(14)<span></span>
</td>
<td class="nump">6<span></span>
</td>
</tr>
<tr class="rou">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest', window );">Total comprehensive loss</a></td>
<td class="num">$ (5,472)<span></span>
</td>
<td class="num">$ (3,153)<span></span>
</td>
<td class="num">$ (13,735)<span></span>
</td>
<td class="num">$ (9,554)<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income. Excludes changes in equity resulting from investments by owners and distributions to owners.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 810<br> -SubTopic 10<br> -Section 55<br> -Paragraph 4K<br> -URI http://asc.fasb.org/extlink&amp;oid=120409616&amp;loc=SL4591552-111686<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 220<br> -SubTopic 10<br> -Section 45<br> -Paragraph 1A<br> -Subparagraph (c)<br> -URI http://asc.fasb.org/extlink&amp;oid=124509347&amp;loc=SL7669619-108580<br><br>Reference 3: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 944<br> -SubTopic 220<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.7-04(20))<br> -URI http://asc.fasb.org/extlink&amp;oid=120400993&amp;loc=SL114874131-224263<br><br>Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 810<br> -SubTopic 10<br> -Section 45<br> -Paragraph 19<br> -URI http://asc.fasb.org/extlink&amp;oid=123454820&amp;loc=SL4569616-111683<br><br>Reference 5: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 220<br> -SubTopic 10<br> -Section 45<br> -Paragraph 1B<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=124509347&amp;loc=SL7669625-108580<br><br>Reference 6: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 220<br> -SubTopic 10<br> -Section S99<br> -Paragraph 2<br> -Subparagraph (SX 210.5-03(22))<br> -URI http://asc.fasb.org/extlink&amp;oid=123367319&amp;loc=SL114868664-224227<br><br>Reference 7: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 942<br> -SubTopic 220<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.9-04(24))<br> -URI http://asc.fasb.org/extlink&amp;oid=120399700&amp;loc=SL114874048-224260<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest</td>
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<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<td><strong> Data Type:</strong></td>
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<td><strong> Balance Type:</strong></td>
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<td><strong> Period Type:</strong></td>
<td>duration</td>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_IncomeStatementAbstract</td>
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<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
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<td><strong> Balance Type:</strong></td>
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<td><strong> Period Type:</strong></td>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_NetIncomeLoss">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.</p></div>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_NetIncomeLoss</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
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<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
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<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
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<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 220<br> -SubTopic 10<br> -Section 45<br> -Paragraph 10A<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=124509347&amp;loc=SL7669646-108580<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
</div>
</body>
</html>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>XML
<SEQUENCE>16
<FILENAME>R6.htm
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
<html>
<head>
<title></title>
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<span style="display: none;">v3.22.0.1</span><table class="report" border="0" cellspacing="2" id="idm140163156958504">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Consolidated Statement of Stockholders' Equity (Unaudited) - USD ($)<br> $ in Thousands</strong></div></th>
<th class="th"><div>Common Stock [Member]</div></th>
<th class="th"><div>Treasury Stock [Member]</div></th>
<th class="th"><div>Additional Paid-in Capital [Member]</div></th>
<th class="th"><div>Stock Subscription Receivable [Member]</div></th>
<th class="th"><div>Retained Earnings [Member]</div></th>
<th class="th"><div>AOCI Attributable to Parent [Member]</div></th>
<th class="th"><div>Total</div></th>
</tr>
<tr class="rc">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockholdersEquity', window );">Beginning balances at Apr. 30, 2020</a></td>
<td class="nump">$ 13<span></span>
</td>
<td class="num">$ (302)<span></span>
</td>
<td class="nump">$ 231,101<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="num">$ (220,136)<span></span>
</td>
<td class="num">$ (183)<span></span>
</td>
<td class="nump">$ 10,492<span></span>
</td>
</tr>
<tr class="rc">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharesOutstanding', window );">Beginning balance, shares at Apr. 30, 2020</a></td>
<td class="nump">12,939,420<span></span>
</td>
<td class="num">(4,251)<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_NetIncomeLoss', window );">Net loss</a></td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="num">(9,560)<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="num">(9,560)<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue', window );">Share-based compensation</a></td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">338<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">338<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised', window );">Proceeds from stock options exercises</a></td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">184<span></span>
</td>
<td class="num">(144)<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">40<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised', window );">Proceeds from stock options exercises, shares</a></td>
<td class="nump">175,500<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_ExerciseOfCommonWarrantsNetOfCosts', window );">Exercise of common warrants, net of costs</a></td>
<td class="nump">$ 1<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">2,607<span></span>
</td>
<td class="num">(1,839)<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">769<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_ExerciseOfCommonWarrantsNetOfCostsShares', window );">Exercise of common warrants, net of costs, shares</a></td>
<td class="nump">677,500<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_StockIssuedDuringPeriodValueNewIssuesOne', window );">Issuance of common stock- Aspire financing, net of issuance costs</a></td>
<td class="nump">$ 7<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">9,976<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">9,983<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_StockIssuedDuringPeriodSharesNewIssuesOne', window );">Issuance of common stock- Aspire financing, net of issuance costs, shares</a></td>
<td class="nump">7,275,000<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockIssuedDuringPeriodValueOther', window );">Issuance of common stock- AGP At The Market offering, net of issuance costs</a></td>
<td class="nump">$ 30<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">66,136<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">66,166<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockIssuedDuringPeriodSharesOther', window );">Issuance of common stock- AGP At The Market offering, net of issuance costs, shares</a></td>
<td class="nump">29,522,389<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TreasuryStockValueAcquiredCostMethod', window );">Acquisition of treasury stock</a></td>
<td class="text"> <span></span>
</td>
<td class="num">$ (36)<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="num">$ (36)<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TreasuryStockSharesAcquired', window );">Acquisition of treasury stock, shares</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="num">(16,789)<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">0<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OtherComprehensiveIncomeLossNetOfTax', window );">Other comprehensive gain/(loss)</a></td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">6<span></span>
</td>
<td class="nump">$ 6<span></span>
</td>
</tr>
<tr class="rc">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockholdersEquity', window );">Ending Balances at Jan. 31, 2021</a></td>
<td class="nump">$ 51<span></span>
</td>
<td class="num">$ (338)<span></span>
</td>
<td class="nump">310,342<span></span>
</td>
<td class="num">(1,983)<span></span>
</td>
<td class="num">(229,696)<span></span>
</td>
<td class="num">(177)<span></span>
</td>
<td class="nump">78,199<span></span>
</td>
</tr>
<tr class="rc">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharesOutstanding', window );">Ending balance, shares at Jan. 31, 2021</a></td>
<td class="nump">50,589,809<span></span>
</td>
<td class="num">(21,040)<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rc">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockholdersEquity', window );">Beginning balances at Apr. 30, 2020</a></td>
<td class="nump">$ 13<span></span>
</td>
<td class="num">$ (302)<span></span>
</td>
<td class="nump">231,101<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="num">(220,136)<span></span>
</td>
<td class="num">(183)<span></span>
</td>
<td class="nump">10,492<span></span>
</td>
</tr>
<tr class="rc">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharesOutstanding', window );">Beginning balance, shares at Apr. 30, 2020</a></td>
<td class="nump">12,939,420<span></span>
</td>
<td class="num">(4,251)<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_NetIncomeLoss', window );">Net loss</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="num">(14,800)<span></span>
</td>
</tr>
<tr class="rc">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockholdersEquity', window );">Ending Balances at Apr. 30, 2021</a></td>
<td class="nump">$ 52<span></span>
</td>
<td class="num">$ (338)<span></span>
</td>
<td class="nump">315,821<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="num">(234,896)<span></span>
</td>
<td class="num">(171)<span></span>
</td>
<td class="nump">80,468<span></span>
</td>
</tr>
<tr class="rc">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharesOutstanding', window );">Ending balance, shares at Apr. 30, 2021</a></td>
<td class="nump">52,479,051<span></span>
</td>
<td class="num">(21,040)<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rc">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockholdersEquity', window );">Beginning balances at Oct. 31, 2020</a></td>
<td class="nump">$ 24<span></span>
</td>
<td class="num">$ (302)<span></span>
</td>
<td class="nump">240,782<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="num">(226,545)<span></span>
</td>
<td class="num">(175)<span></span>
</td>
<td class="nump">13,784<span></span>
</td>
</tr>
<tr class="rc">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharesOutstanding', window );">Beginning balance, shares at Oct. 31, 2020</a></td>
<td class="nump">24,153,554<span></span>
</td>
<td class="num">(4,251)<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_NetIncomeLoss', window );">Net loss</a></td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="num">(3,151)<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="num">(3,151)<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue', window );">Share-based compensation</a></td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">115<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">115<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised', window );">Proceeds from stock options exercises</a></td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">184<span></span>
</td>
<td class="num">(144)<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">40<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised', window );">Proceeds from stock options exercises, shares</a></td>
<td class="nump">175,500<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_ExerciseOfCommonWarrantsNetOfCosts', window );">Exercise of common warrants, net of costs</a></td>
<td class="nump">$ 1<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">2,607<span></span>
</td>
<td class="num">(1,839)<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">769<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_ExerciseOfCommonWarrantsNetOfCostsShares', window );">Exercise of common warrants, net of costs, shares</a></td>
<td class="nump">677,500<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_StockIssuedDuringPeriodValueNewIssuesOne', window );">Issuance of common stock- Aspire financing, net of issuance costs</a></td>
<td class="nump">$ 2<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">6,740<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">6,742<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_StockIssuedDuringPeriodSharesNewIssuesOne', window );">Issuance of common stock- Aspire financing, net of issuance costs, shares</a></td>
<td class="nump">1,750,000<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockIssuedDuringPeriodValueOther', window );">Issuance of common stock- AGP At The Market offering, net of issuance costs</a></td>
<td class="nump">$ 24<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">59,914<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">59,938<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockIssuedDuringPeriodSharesOther', window );">Issuance of common stock- AGP At The Market offering, net of issuance costs, shares</a></td>
<td class="nump">23,833,255<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TreasuryStockValueAcquiredCostMethod', window );">Acquisition of treasury stock</a></td>
<td class="text"> <span></span>
</td>
<td class="num">$ (36)<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="num">(36)<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TreasuryStockSharesAcquired', window );">Acquisition of treasury stock, shares</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="num">(16,789)<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OtherComprehensiveIncomeLossNetOfTax', window );">Other comprehensive gain/(loss)</a></td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="num">(2)<span></span>
</td>
<td class="num">(2)<span></span>
</td>
</tr>
<tr class="rc">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockholdersEquity', window );">Ending Balances at Jan. 31, 2021</a></td>
<td class="nump">$ 51<span></span>
</td>
<td class="num">$ (338)<span></span>
</td>
<td class="nump">310,342<span></span>
</td>
<td class="num">(1,983)<span></span>
</td>
<td class="num">(229,696)<span></span>
</td>
<td class="num">(177)<span></span>
</td>
<td class="nump">78,199<span></span>
</td>
</tr>
<tr class="rc">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharesOutstanding', window );">Ending balance, shares at Jan. 31, 2021</a></td>
<td class="nump">50,589,809<span></span>
</td>
<td class="num">(21,040)<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rc">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockholdersEquity', window );">Beginning balances at Apr. 30, 2021</a></td>
<td class="nump">$ 52<span></span>
</td>
<td class="num">$ (338)<span></span>
</td>
<td class="nump">315,821<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="num">(234,896)<span></span>
</td>
<td class="num">(171)<span></span>
</td>
<td class="nump">80,468<span></span>
</td>
</tr>
<tr class="rc">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharesOutstanding', window );">Beginning balance, shares at Apr. 30, 2021</a></td>
<td class="nump">52,479,051<span></span>
</td>
<td class="num">(21,040)<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_NetIncomeLoss', window );">Net loss</a></td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="num">(13,721)<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="num">(13,721)<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue', window );">Share-based compensation</a></td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">864<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">864<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised', window );">Proceeds from stock options exercises</a></td>
<td class="nump">$ 1<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">89<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">$ 90<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised', window );">Proceeds from stock options exercises, shares</a></td>
<td class="nump">85,000<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TreasuryStockSharesAcquired', window );">Acquisition of treasury stock, shares</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">0<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockIssuedDuringPeriodValueAcquisitions', window );">Issuance of shares for acquisition</a></td>
<td class="nump">$ 3<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">5,852<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">$ 5,855<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockIssuedDuringPeriodSharesAcquisitions', window );">Issuance of shares in acquisition, shares</a></td>
<td class="nump">3,330,162<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OtherComprehensiveIncomeLossNetOfTax', window );">Other comprehensive gain/(loss)</a></td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="num">(14)<span></span>
</td>
<td class="num">(14)<span></span>
</td>
</tr>
<tr class="rc">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockholdersEquity', window );">Ending Balances at Jan. 31, 2022</a></td>
<td class="nump">$ 56<span></span>
</td>
<td class="num">$ (338)<span></span>
</td>
<td class="nump">322,626<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="num">(248,617)<span></span>
</td>
<td class="num">(185)<span></span>
</td>
<td class="nump">73,542<span></span>
</td>
</tr>
<tr class="rc">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharesOutstanding', window );">Ending balance, shares at Jan. 31, 2022</a></td>
<td class="nump">55,894,213<span></span>
</td>
<td class="num">(21,040)<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rc">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockholdersEquity', window );">Beginning balances at Oct. 31, 2021</a></td>
<td class="nump">$ 52<span></span>
</td>
<td class="num">$ (338)<span></span>
</td>
<td class="nump">316,389<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="num">(243,191)<span></span>
</td>
<td class="num">(139)<span></span>
</td>
<td class="nump">72,773<span></span>
</td>
</tr>
<tr class="rc">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharesOutstanding', window );">Beginning balance, shares at Oct. 31, 2021</a></td>
<td class="nump">52,499,051<span></span>
</td>
<td class="num">(21,040)<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_NetIncomeLoss', window );">Net loss</a></td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="num">(5,471)<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="num">(5,471)<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue', window );">Share-based compensation</a></td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">317<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">317<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised', window );">Proceeds from stock options exercises</a></td>
<td class="nump">$ 1<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">68<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">69<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised', window );">Proceeds from stock options exercises, shares</a></td>
<td class="nump">65,000<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockIssuedDuringPeriodValueAcquisitions', window );">Issuance of shares for acquisition</a></td>
<td class="nump">$ 3<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">5,852<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">5,855<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockIssuedDuringPeriodSharesAcquisitions', window );">Issuance of shares in acquisition, shares</a></td>
<td class="nump">3,330,162<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OtherComprehensiveIncomeLossNetOfTax', window );">Other comprehensive gain/(loss)</a></td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">45<span></span>
</td>
<td class="num">(46)<span></span>
</td>
<td class="num">(1)<span></span>
</td>
</tr>
<tr class="rc">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockholdersEquity', window );">Ending Balances at Jan. 31, 2022</a></td>
<td class="nump">$ 56<span></span>
</td>
<td class="num">$ (338)<span></span>
</td>
<td class="nump">$ 322,626<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="num">$ (248,617)<span></span>
</td>
<td class="num">$ (185)<span></span>
</td>
<td class="nump">$ 73,542<span></span>
</td>
</tr>
<tr class="rc">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharesOutstanding', window );">Ending balance, shares at Jan. 31, 2022</a></td>
<td class="nump">55,894,213<span></span>
</td>
<td class="num">(21,040)<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_ExerciseOfCommonWarrantsNetOfCosts">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Exercise of common warrants, net of costs.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_ExerciseOfCommonWarrantsNetOfCosts</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_ExerciseOfCommonWarrantsNetOfCostsShares">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Exercise of common warrants, net of costs, shares.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_ExerciseOfCommonWarrantsNetOfCostsShares</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_StockIssuedDuringPeriodSharesNewIssuesOne">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Stock issued during period shares new issue one.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_StockIssuedDuringPeriodSharesNewIssuesOne</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_StockIssuedDuringPeriodValueNewIssuesOne">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Issuance of common stock at the market offering, net of issuance costs.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_StockIssuedDuringPeriodValueNewIssuesOne</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of increase to additional paid-in capital (APIC) for recognition of cost for award under share-based payment arrangement.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 20<br> -Section 55<br> -Paragraph 12<br> -URI http://asc.fasb.org/extlink&amp;oid=122142933&amp;loc=d3e11149-113907<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 1<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5047-113901<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 20<br> -Section 55<br> -Paragraph 13<br> -URI http://asc.fasb.org/extlink&amp;oid=122142933&amp;loc=d3e11178-113907<br><br>Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 35<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=123468992&amp;loc=d3e4534-113899<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_NetIncomeLoss">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 942<br> -SubTopic 220<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.9-04(22))<br> -URI http://asc.fasb.org/extlink&amp;oid=120399700&amp;loc=SL114874048-224260<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 32<br> -Subparagraph (f)<br> -URI http://asc.fasb.org/extlink&amp;oid=123359005&amp;loc=d3e8933-108599<br><br>Reference 3: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 250<br> -SubTopic 10<br> -Section 50<br> -Paragraph 4<br> -URI 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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_NetIncomeLoss</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_OtherComprehensiveIncomeLossNetOfTax">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount after tax and reclassification adjustments of other comprehensive income (loss).</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 220<br> -SubTopic 10<br> -Section 45<br> -Paragraph 1A<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=124509347&amp;loc=SL7669619-108580<br><br>Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 220<br> -SubTopic 10<br> -Section 50<br> -Paragraph 4<br> -URI http://asc.fasb.org/extlink&amp;oid=124431353&amp;loc=SL124442407-227067<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=123467817&amp;loc=d3e21463-112644<br><br>Reference 4: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 830<br> -SubTopic 30<br> -Section 45<br> -Paragraph 17<br> -URI http://asc.fasb.org/extlink&amp;oid=118261656&amp;loc=d3e32136-110900<br><br>Reference 5: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 220<br> -SubTopic 10<br> -Section S99<br> -Paragraph 2<br> -Subparagraph (SX 210.5-03(21))<br> -URI http://asc.fasb.org/extlink&amp;oid=123367319&amp;loc=SL114868664-224227<br><br>Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 220<br> -SubTopic 10<br> -Section 55<br> -Paragraph 15<br> -URI http://asc.fasb.org/extlink&amp;oid=124507222&amp;loc=d3e1436-108581<br><br>Reference 7: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 830<br> -SubTopic 30<br> -Section 45<br> -Paragraph 20<br> -URI http://asc.fasb.org/extlink&amp;oid=118261656&amp;loc=d3e32211-110900<br><br>Reference 8: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 830<br> -SubTopic 30<br> -Section 50<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=6450520&amp;loc=d3e32583-110901<br><br>Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 220<br> -SubTopic 10<br> -Section 50<br> -Paragraph 5<br> -URI http://asc.fasb.org/extlink&amp;oid=124431353&amp;loc=SL124442411-227067<br><br>Reference 10: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 220<br> -SubTopic 10<br> -Section 45<br> -Paragraph 1B<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=124509347&amp;loc=SL7669625-108580<br><br>Reference 11: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 942<br> -SubTopic 220<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.9-04(23))<br> -URI http://asc.fasb.org/extlink&amp;oid=120399700&amp;loc=SL114874048-224260<br><br>Reference 12: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 944<br> -SubTopic 220<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.7-04(19))<br> -URI http://asc.fasb.org/extlink&amp;oid=120400993&amp;loc=SL114874131-224263<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OtherComprehensiveIncomeLossNetOfTax</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_SharesOutstanding">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Number of shares issued which are neither cancelled nor held in the treasury.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_SharesOutstanding</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_StockIssuedDuringPeriodSharesAcquisitions">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Number of shares of stock issued during the period pursuant to acquisitions.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(29))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.3-04)<br> -URI http://asc.fasb.org/extlink&amp;oid=120397183&amp;loc=d3e187085-122770<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(28))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_StockIssuedDuringPeriodSharesAcquisitions</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_StockIssuedDuringPeriodSharesOther">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Number of shares of stock issued attributable to transactions classified as other.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_StockIssuedDuringPeriodSharesOther</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Number of share options (or share units) exercised during the current period.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(1)(iv)(2)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.3-04)<br> -URI http://asc.fasb.org/extlink&amp;oid=120397183&amp;loc=d3e187085-122770<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(28))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(29))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=123467817&amp;loc=d3e21463-112644<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_StockIssuedDuringPeriodValueAcquisitions">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Value of stock issued pursuant to acquisitions during the period.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=123467817&amp;loc=d3e21463-112644<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.3-04)<br> -URI http://asc.fasb.org/extlink&amp;oid=120397183&amp;loc=d3e187085-122770<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.29-31)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_StockIssuedDuringPeriodValueAcquisitions</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_StockIssuedDuringPeriodValueOther">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Value of shares of stock issued attributable to transactions classified as other.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_StockIssuedDuringPeriodValueOther</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Value of stock issued as a result of the exercise of stock options.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=123467817&amp;loc=d3e21463-112644<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.3-04)<br> -URI http://asc.fasb.org/extlink&amp;oid=120397183&amp;loc=d3e187085-122770<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.29-31)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_StockholdersEquity">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 235<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.4-08(g)(1)(ii))<br> -URI http://asc.fasb.org/extlink&amp;oid=120395691&amp;loc=d3e23780-122690<br><br>Reference 2: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 852<br> -SubTopic 10<br> -Section 55<br> -Paragraph 10<br> -URI http://asc.fasb.org/extlink&amp;oid=84165509&amp;loc=d3e56426-112766<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 310<br> -SubTopic 10<br> -Section S99<br> -Paragraph 2<br> -Subparagraph (SAB Topic 4.E)<br> -URI http://asc.fasb.org/extlink&amp;oid=122038336&amp;loc=d3e74512-122707<br><br>Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(31))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(29))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(30))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 825<br> -SubTopic 10<br> -Section 50<br> -Paragraph 28<br> -Subparagraph (f)<br> -URI http://asc.fasb.org/extlink&amp;oid=123596393&amp;loc=d3e14064-108612<br><br>Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 323<br> -SubTopic 10<br> -Section 50<br> -Paragraph 3<br> -Subparagraph (c)<br> -URI http://asc.fasb.org/extlink&amp;oid=114001798&amp;loc=d3e33918-111571<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_StockholdersEquity</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_TreasuryStockSharesAcquired">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Number of shares that have been repurchased during the period and are being held in treasury.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=123467817&amp;loc=d3e21463-112644<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.3-04)<br> -URI http://asc.fasb.org/extlink&amp;oid=120397183&amp;loc=d3e187085-122770<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(29))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_TreasuryStockSharesAcquired</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_TreasuryStockValueAcquiredCostMethod">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=123467817&amp;loc=d3e21463-112644<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 30<br> -Section 45<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=6405813&amp;loc=d3e23239-112655<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.3-04)<br> -URI http://asc.fasb.org/extlink&amp;oid=120397183&amp;loc=d3e187085-122770<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
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<td style="white-space:nowrap;">us-gaap_TreasuryStockValueAcquiredCostMethod</td>
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<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
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<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
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<td><strong> Period Type:</strong></td>
<td>duration</td>
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<span style="display: none;">v3.22.0.1</span><table class="report" border="0" cellspacing="2" id="idm140163156169016">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Consolidated Statements of Cash Flows (Unaudited) - USD ($)<br> $ in Thousands</strong></div></th>
<th class="th" colspan="2">3 Months Ended</th>
<th class="th" colspan="2">9 Months Ended</th>
<th class="th" colspan="1">12 Months Ended</th>
</tr>
<tr>
<th class="th"><div>Jan. 31, 2022</div></th>
<th class="th"><div>Jan. 31, 2021</div></th>
<th class="th"><div>Jan. 31, 2022</div></th>
<th class="th"><div>Jan. 31, 2021</div></th>
<th class="th"><div>Apr. 30, 2021</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract', window );"><strong>Cash flows from operating activities:</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_NetIncomeLoss', window );">Net loss</a></td>
<td class="num">$ (5,471)<span></span>
</td>
<td class="num">$ (3,151)<span></span>
</td>
<td class="num">$ (13,721)<span></span>
</td>
<td class="num">$ (9,560)<span></span>
</td>
<td class="num">$ (14,800)<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract', window );"><strong>Adjustments to reconcile net loss to net cash used in operating activities:</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ForeignCurrencyTransactionGainLossBeforeTax', window );">Foreign exchange loss (gain)</a></td>
<td class="num">(5)<span></span>
</td>
<td class="num">(3)<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="num">(13)<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_DepreciationDepletionAndAmortization', window );">Depreciation of fixed assets</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">104<span></span>
</td>
<td class="nump">106<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AmortizationOfIntangibleAssets', window );">Amortization of intangible assets</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">18<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OperatingLeaseRightOfUseAssetAmortizationExpense', window );">Amortization of right of use asset</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">211<span></span>
</td>
<td class="nump">159<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_GainLossOnSaleOfPropertyPlantEquipment', window );">Loss on disposal of property, plant and equipment</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">2<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_GainsLossesOnExtinguishmentOfDebt', window );">Gain on extinguishment of PPP Loan</a></td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="num">(890)<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensation', window );">Stock-based compensation</a></td>
<td class="nump">317<span></span>
</td>
<td class="nump">115<span></span>
</td>
<td class="nump">864<span></span>
</td>
<td class="nump">338<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_ChangeInFairValueOfContigentLiability', window );">Change in fair value of contingent liability</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="num">(60)<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract', window );"><strong>Changes in operating assets and liabilities, net of acquisition:</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_IncreaseDecreaseInAccountsReceivable', window );">Accounts receivable</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">237<span></span>
</td>
<td class="nump">105<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_IncreaseDecreaseInContractWithCustomerAsset', window );">Contract assets</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="num">(217)<span></span>
</td>
<td class="nump">188<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_IncreaseDecreaseInInventories', window );">Inventory</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="num">(193)<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_IncreaseDecreaseInOtherOperatingAssets', window );">Other assets</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">51<span></span>
</td>
<td class="num">(310)<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_IncreaseDecreaseInAccountsPayable', window );">Accounts payable</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="num">(165)<span></span>
</td>
<td class="num">(473)<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_IncreaseDecreaseInAccruedLiabilities', window );">Accrued expenses</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="num">(589)<span></span>
</td>
<td class="nump">1,192<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_IncreaseDecreaseInLeaseLiability', window );">Change in lease liability</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="num">(228)<span></span>
</td>
<td class="num">(169)<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_IncreaseDecreaseInContractWithCustomerLiability', window );">Contract liabilities</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">15<span></span>
</td>
<td class="num">(90)<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_IncreaseDecreaseInLitigationPayable', window );">Litigation payable</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="num">(1,224)<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rou">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_NetCashProvidedByUsedInOperatingActivities', window );">Net cash used in operating activities</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="num">(15,787)<span></span>
</td>
<td class="num">(8,525)<span></span>
</td>
<td class="num">(11,700)<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract', window );"><strong>Cash flows from investing activities:</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PaymentsToAcquireProductiveAssets', window );">Purchase of property, plant and equipment</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="num">(319)<span></span>
</td>
<td class="num">(17)<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired', window );">Payments for MAR acquisition, net of cash acquired</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="num">(3,544)<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rou">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_NetCashProvidedByUsedInInvestingActivities', window );">Net cash used in investing activities</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="num">(3,863)<span></span>
</td>
<td class="num">(17)<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract', window );"><strong>Cash flows from financing activities:</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ProceedsFromIssuanceOfLongTermDebt', window );">Proceeds from Paycheck Protection Program Loan</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">890<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ProceedsFromConstructionLoansPayable', window );">Proceeds from loan payable</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">467<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_RepaymentsOfDebt', window );">Payments of loan payable</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="num">(292)<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ProceedsFromStockOptionsExercised', window );">Proceeds from stock option exercises</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">90<span></span>
</td>
<td class="nump">40<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ProceedsFromIssuanceOfCommonStock', window );">Proceeds from issuance of common stock- Aspire financing net of issuance costs</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">9,983<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ProceedsFromIssuanceInitialPublicOffering', window );">Proceeds from issuance of common stock- AGP At The Market offering, net of issuance costs</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">66,166<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ProceedsFromWarrantExercises', window );">Proceeds associated with exercise of common stock warrants</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">769<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PaymentsForRepurchaseOfCommonStock', window );">Acquisition of treasury stock</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="num">(36)<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rou">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_NetCashProvidedByUsedInFinancingActivities', window );">Net cash provided by financing activities</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">90<span></span>
</td>
<td class="nump">77,987<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents', window );">Effect of exchange rate changes on cash, cash equivalents and restricted cash</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="num">(14)<span></span>
</td>
<td class="nump">32<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rou">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect', window );">Net (decrease) / increase in cash, cash equivalents and restricted cash</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="num">(19,574)<span></span>
</td>
<td class="nump">69,477<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations', window );">Cash, cash equivalents and restricted cash, beginning of period</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">83,634<span></span>
</td>
<td class="nump">10,930<span></span>
</td>
<td class="nump">10,930<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations', window );">Cash, cash equivalents and restricted cash, end of period</a></td>
<td class="nump">$ 64,060<span></span>
</td>
<td class="nump">$ 80,407<span></span>
</td>
<td class="nump">64,060<span></span>
</td>
<td class="nump">80,407<span></span>
</td>
<td class="nump">$ 83,634<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SupplementalCashFlowElementsAbstract', window );"><strong>Supplemental disclosure of noncash operating activities:</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_PrepaidFinancingCostsReportedInAccruedExpenses', window );">Prepaid financing costs reported in accrued expenses</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">62<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_NonCashOperatingAndInvestingActivitiesAbstract', window );"><strong>Supplemental disclosure of noncash investing and financing activities:</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_AcquisitionOfPropertyPlantAndEquipmentThroughAccountsPayable', window );">Acquisition of property, plant and equipment through accounts payable</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">9<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_IssuanceOfCommonStockInAcquisition', window );">Issuance of common stock in acquisition of MAR</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">5,855<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_AdvancePayable', window );">Advance payable &#8211; MAR</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">456<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_ContingentLiability', window );">Contingent liability</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">1,591<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_OutstandingReceivableForSaleOfSharesFromWarrantExercises', window );">Outstanding receivable for sale of shares from warrant exercises</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">1,838<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_OutstandingReceivableForSaleOfSharesFromStockOptionExercises', window );">Outstanding receivable for sale of shares from stock option exercises</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">$ 144<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_AcquisitionOfPropertyPlantAndEquipmentThroughAccountsPayable">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Acquisition of property plant and equipment through accounts payable.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_AcquisitionOfPropertyPlantAndEquipmentThroughAccountsPayable</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_AdvancePayable">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_AdvancePayable</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_ChangeInFairValueOfContigentLiability">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_ChangeInFairValueOfContigentLiability</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_ContingentLiability">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Contingent liability.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_ContingentLiability</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_IncreaseDecreaseInLeaseLiability">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Increase decrease in lease liabilitiy.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_IncreaseDecreaseInLeaseLiability</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_IncreaseDecreaseInLitigationPayable">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Increase decrease in litigation payable.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_IncreaseDecreaseInLitigationPayable</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_IssuanceOfCommonStockInAcquisition">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Issuance of common stock in acquisition.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_IssuanceOfCommonStockInAcquisition</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_NonCashOperatingAndInvestingActivitiesAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_NonCashOperatingAndInvestingActivitiesAbstract</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
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<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
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<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_OutstandingReceivableForSaleOfSharesFromStockOptionExercises">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Outstanding receivable for sale of shares from stock option exercises.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_OutstandingReceivableForSaleOfSharesFromStockOptionExercises</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_OutstandingReceivableForSaleOfSharesFromWarrantExercises">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Outstanding receivable for sale of shares from warrant exercises.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_OutstandingReceivableForSaleOfSharesFromWarrantExercises</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_PrepaidFinancingCostsReportedInAccruedExpenses">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Prepaid financing costs reported in acrued expnses.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_PrepaidFinancingCostsReportedInAccruedExpenses</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
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</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AmortizationOfIntangibleAssets">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 28<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3602-108585<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 350<br> -SubTopic 30<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (a)(2)<br> -URI http://asc.fasb.org/extlink&amp;oid=66006027&amp;loc=d3e16323-109275<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 350<br> -SubTopic 30<br> -Section 45<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=6388964&amp;loc=d3e16225-109274<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AmortizationOfIntangibleAssets</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
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</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; including, but not limited to, disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 50<br> -Paragraph 8<br> -URI http://asc.fasb.org/extlink&amp;oid=123431023&amp;loc=SL98516268-108586<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 24<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3521-108585<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 4<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3044-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of increase (decrease) in cash, cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; including effect from exchange rate change. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 830<br> -SubTopic 230<br> -Section 45<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=123444420&amp;loc=d3e33268-110906<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 24<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3521-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_DepreciationDepletionAndAmortization">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 22<br> -Subparagraph (e)<br> -URI http://asc.fasb.org/extlink&amp;oid=123359005&amp;loc=d3e8736-108599<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 28<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3602-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_DepreciationDepletionAndAmortization</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of increase (decrease) from effect of exchange rate changes on cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; held in foreign currencies. Excludes amounts for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 830<br> -SubTopic 230<br> -Section 45<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=123444420&amp;loc=d3e33268-110906<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ForeignCurrencyTransactionGainLossBeforeTax">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 830<br> -SubTopic 20<br> -Section 45<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=125521441&amp;loc=d3e30690-110894<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 830<br> -SubTopic 20<br> -Section 35<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=123602790&amp;loc=d3e30226-110892<br><br>Reference 3: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 830<br> -SubTopic 10<br> -Section 45<br> -Paragraph 17<br> -URI http://asc.fasb.org/extlink&amp;oid=120253306&amp;loc=d3e28228-110885<br><br>Reference 4: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 830<br> -SubTopic 20<br> -Section 50<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=124440516&amp;loc=d3e30840-110895<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ForeignCurrencyTransactionGainLossBeforeTax</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_GainLossOnSaleOfPropertyPlantEquipment">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 28<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3602-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_GainLossOnSaleOfPropertyPlantEquipment</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_GainsLossesOnExtinguishmentOfDebt">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 50<br> -Section 40<br> -Paragraph 4<br> -URI http://asc.fasb.org/extlink&amp;oid=123467658&amp;loc=d3e12355-112629<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 50<br> -Section 40<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=123467658&amp;loc=d3e12317-112629<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 28<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3602-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_GainsLossesOnExtinguishmentOfDebt</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_IncreaseDecreaseInAccountsPayable">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The increase (decrease) during the reporting period in the aggregate amount of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 28<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3602-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_IncreaseDecreaseInAccountsPayable</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_IncreaseDecreaseInAccountsReceivable">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The increase (decrease) during the reporting period in amount due within one year (or one business cycle) from customers for the credit sale of goods and services.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 28<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3602-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_IncreaseDecreaseInAccountsReceivable</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_IncreaseDecreaseInAccruedLiabilities">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The increase (decrease) during the reporting period in the aggregate amount of expenses incurred but not yet paid.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 28<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3602-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_IncreaseDecreaseInAccruedLiabilities</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_IncreaseDecreaseInContractWithCustomerAsset">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of increase (decrease) in right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 28<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3602-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_IncreaseDecreaseInContractWithCustomerAsset</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_IncreaseDecreaseInContractWithCustomerLiability">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of increase (decrease) in obligation to transfer good or service to customer for which consideration has been received or is receivable.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 28<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3602-108585<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 912<br> -SubTopic 310<br> -Section 45<br> -Paragraph 11<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=123371682&amp;loc=d3e55415-109406<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_IncreaseDecreaseInContractWithCustomerLiability</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_IncreaseDecreaseInInventories">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The increase (decrease) during the reporting period in the aggregate value of all inventory held by the reporting entity, associated with underlying transactions that are classified as operating activities.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 28<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3602-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_IncreaseDecreaseInInventories</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_IncreaseDecreaseInOperatingCapitalAbstract</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_IncreaseDecreaseInOtherOperatingAssets">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of increase (decrease) in operating assets classified as other.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 28<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3602-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_IncreaseDecreaseInOtherOperatingAssets</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_NetCashProvidedByUsedInFinancingActivities">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 24<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3521-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_NetCashProvidedByUsedInFinancingActivities</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_NetCashProvidedByUsedInInvestingActivities">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 24<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3521-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_NetCashProvidedByUsedInInvestingActivities</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_NetCashProvidedByUsedInOperatingActivities">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 25<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3536-108585<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 24<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3521-108585<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 28<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3602-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_NetCashProvidedByUsedInOperatingActivities</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<td><strong> Balance Type:</strong></td>
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<tr>
<td><strong> Period Type:</strong></td>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
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<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_NetIncomeLoss">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 942<br> -SubTopic 220<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.9-04(22))<br> -URI http://asc.fasb.org/extlink&amp;oid=120399700&amp;loc=SL114874048-224260<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 32<br> -Subparagraph (f)<br> -URI http://asc.fasb.org/extlink&amp;oid=123359005&amp;loc=d3e8933-108599<br><br>Reference 3: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 250<br> -SubTopic 10<br> -Section 50<br> -Paragraph 4<br> -URI 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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_NetIncomeLoss</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_OperatingLeaseRightOfUseAssetAmortizationExpense">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of amortization expense for right-of-use asset from operating lease.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 28<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3602-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OperatingLeaseRightOfUseAssetAmortizationExpense</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_PaymentsForRepurchaseOfCommonStock">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The cash outflow to reacquire common stock during the period.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 15<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3291-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_PaymentsForRepurchaseOfCommonStock</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 13<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3213-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired</td>
</tr>
<tr>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 13<br> -Subparagraph (c)<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3213-108585<br><br>Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 805<br> -SubTopic 50<br> -Section 30<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=123362884&amp;loc=d3e9212-128498<br><br>Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 805<br> -SubTopic 50<br> -Section 30<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=123362884&amp;loc=d3e9215-128498<br><br>Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 805<br> -SubTopic 50<br> -Section 25<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=123385561&amp;loc=d3e9135-128495<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_PaymentsToAcquireProductiveAssets</td>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The cash inflow from borrowings to finance the cost of construction.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 14<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3255-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ProceedsFromConstructionLoansPayable</td>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The cash inflow associated with the amount received from entity's first offering of stock to the public.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 14<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3255-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
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<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The cash inflow from the additional capital contribution to the entity.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 14<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3255-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ProceedsFromIssuanceOfCommonStock</td>
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<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<td><strong> Balance Type:</strong></td>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 14<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3255-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ProceedsFromIssuanceOfLongTermDebt</td>
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<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of cash inflow from exercise of option under share-based payment arrangement.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2A<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=SL79508275-113901<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 14<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3255-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ProceedsFromStockOptionsExercised</td>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The cash inflow associated with the amount received from holders exercising their stock warrants.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 14<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3255-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 15<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3291-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of noncash expense for share-based payment arrangement.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 28<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3602-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
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<span style="display: none;">v3.22.0.1</span><table class="report" border="0" cellspacing="2" id="idm140163162450808">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Background, Basis of Presentation and Liquidity<br></strong></div></th>
<th class="th" colspan="1">9 Months Ended</th>
</tr>
<tr><th class="th"><div>Jan. 31, 2022</div></th></tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract', window );"><strong>Organization, Consolidation and Presentation of Financial Statements [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_BusinessDescriptionAndBasisOfPresentationTextBlock', window );">Background, Basis of Presentation and Liquidity</a></td>
<td class="text"><p id="xdx_806_eus-gaap--BusinessDescriptionAndBasisOfPresentationTextBlock_zkWcjBuhQ4L5" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(1)
<span id="xdx_826_zS6TElivvWR2">Background, Basis of Presentation and Liquidity</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>(a)
Background</i></b></span></p>



<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.25in; text-indent: -0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>&#160;</i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Ocean
Power Technologies, Inc. (the &#8220;Company&#8221;) was founded in 1984 in New Jersey, commenced business operations in 1994 and re-incorporated
in Delaware in 2007. We are a complete solutions provider, controlling the design, manufacturing, sales, installation, operations and
maintenance of our products and services. Our solutions provide distributed offshore power which is persistent, reliable, and economical
along with power and communications for remote surface and subsea applications. Historically, funding from government agencies, such
as research and development grants, accounted for a significant portion of the Company&#8217;s revenues. Today our goal is to generate
the majority of our revenue from the sale or lease of our products and solutions, and sales of services to support our business operations.
As we continue to develop and commercialize our products and services, we expect to have a net decrease in cash due to the use of cash
from operating activities unless and until we achieve positive cash flow from the commercialization of products, solutions and services.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>(b)
Basis of Presentation</i></b></span></p>



<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.25in; text-indent: -0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>&#160;</i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
accompanying unaudited consolidated financial statements have been prepared in accordance with accounting principles generally accepted
in the United States of America (&#8220;GAAP&#8221;) and for interim financial information in accordance with the Securities and Exchange
Commission (&#8220;SEC&#8221;), instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all the
information and footnotes required by GAAP for complete financial statements. In the opinion of management, all adjustments (consisting
of normal recurring adjustments) considered necessary for a fair presentation have been included. The interim operating results are not
necessarily indicative of the results for a full year or for any other interim period. Further information on potential factors that
could affect the Company&#8217;s financial results can be found in the Company&#8217;s Annual Report on Form 10-K for the year ended
April 30, 2021, as filed with the SEC and elsewhere in this Form 10-Q. Certain items have been reclassified from prior periods to be
consistent with current GAAP presentations.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>(c)
Liquidity</i></b></span></p>



<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.25in; text-indent: -0.25in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>&#160;</i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">For
the nine months ended January 31, 2022, and the fiscal year ended April 30, 2021, the Company incurred net losses of approximately $<span id="xdx_905_eus-gaap--NetIncomeLoss_iN_pn5n6_di_c20210501__20220131_zJzs7XuJKCr8" title="Net loss">13.7
</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">million and $<span id="xdx_906_eus-gaap--NetIncomeLoss_iN_pn5n6_di_c20200501__20210430_zqag8EAq5Vch" title="Net loss">14.8
</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">million, respectively, and used cash in operating
activities of approximately $<span id="xdx_908_eus-gaap--NetCashProvidedByUsedInOperatingActivities_iN_pn5n6_di_c20210501__20220131_zSVVxKozt4Rj" title="Net cash in operating activities">15.8
</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">million and $<span id="xdx_900_eus-gaap--NetCashProvidedByUsedInOperatingActivities_iN_pn5n6_di_c20200501__20210430_zPz2ST3dW749" title="Net cash in operating activities">11.7
</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">million, respectively. The Company has continued
to make investments in ongoing product development efforts in anticipation of future growth, including its recent acquisition of Marine
Advanced Robotics, Inc., as described in Note 18. The Company&#8217;s future results of operations involve significant risks and uncertainties.
Factors that could affect the Company&#8217;s future operating results and could cause actual results to vary materially from expectations
include, but are not limited to, performance of its products, its ability to market and commercialize its products and new products that
it may develop, technology development, scalability of technology and production, ability to attract and retain key personnel, concentration
of customers and suppliers, deployment risks and integration of acquisitions, pending or threatened litigation, and the impact of COVID-19,
and any variants on its business. The Company previously obtained equity financing through its At the Market Offering Agreement (&#8220;ATM&#8221;)
with A.G.P/Alliance Global Partners (&#8220;AGP&#8221;) and through its equity line financing with Aspire Capital Fund, LLC (&#8220;Aspire
Capital&#8221;), but the Company cannot be sure that additional equity and/or debt financing will be available to the Company as needed
on acceptable terms, or at all. For fiscal year 2022 to date, management has not obtained any additional capital financing. Management
believes the Company&#8217;s current cash balance of $<span id="xdx_907_eus-gaap--Cash_iI_pn5n6_c20220131_zzYnUqU3V4sh">63.5</span></span>
<span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">million is sufficient to fund its planned expenditures through
at least March 2023.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">On
January 7, 2019, the Company entered into an At the Market Offering Agreement with AGP (the &#8220;2019 ATM Facility&#8221;), under which
the Company could issue and sell to or through AGP, acting as agent and/or principal, shares of the Company&#8217;s common stock having
an aggregate offering price of up to $<span id="xdx_904_eus-gaap--ProceedsFromIssuanceInitialPublicOffering_pn5n6_c20190106__20190107__us-gaap--TypeOfArrangementAxis__custom--TwoThousandNinteenATMFacilityMember__dei--LegalEntityAxis__custom--AGPAllianceGlobalPartnersMember_zqyQZ18NAmnh" title="Proceeds from initial public offering">25.0</span> million. From inception of the program through its termination on December 8, 2020, under
the 2019 ATM Facility, the Company sold and issued an aggregate of <span id="xdx_90E_eus-gaap--SaleOfStockNumberOfSharesIssuedInTransaction_pid_c20190106__20190107__us-gaap--TypeOfArrangementAxis__custom--TwoThousandNinteenATMFacilityMember__dei--LegalEntityAxis__custom--AGPAllianceGlobalPartnersMember_zDTm2R3uSKvi" title="Number of common stock shares sold">17,595,472</span> shares of its common stock with an aggregate market value
of $<span id="xdx_903_eus-gaap--SaleOfStockConsiderationReceivedPerTransaction_pn5n6_c20190106__20190107__us-gaap--TypeOfArrangementAxis__custom--TwoThousandNinteenATMFacilityMember__dei--LegalEntityAxis__custom--AGPAllianceGlobalPartnersMember_zspnLaf4ker1" title="Proceeds from issuance or sale of equity, net of issuance costs">23.4</span> million at an average price of $<span id="xdx_90F_eus-gaap--SaleOfStockPricePerShare_iI_pid_c20190107__us-gaap--TypeOfArrangementAxis__custom--TwoThousandNinteenATMFacilityMember__dei--LegalEntityAxis__custom--AGPAllianceGlobalPartnersMember_z6Wv99wrEUl5" title="Average purchase price per share">1.33</span> per share, including <span id="xdx_908_eus-gaap--SaleOfStockNumberOfSharesIssuedInTransaction_pid_c20190106__20190107__dei--LegalEntityAxis__custom--AGPAllianceGlobalPartnersMember_zVH1837TVZXe" title="Number of common stock shares sold">12,342,506</span> shares in fiscal year 2021 with an aggregate market value
of $<span id="xdx_900_eus-gaap--SaleOfStockConsiderationReceivedPerTransaction_pn5n6_c20190106__20190107__dei--LegalEntityAxis__custom--AGPAllianceGlobalPartnersMember_zBjAoYMsRVD7" title="Proceeds from issuance or sale of equity, net of issuance costs">18.7</span> million at an average price of $<span id="xdx_906_eus-gaap--SaleOfStockPricePerShare_iI_pid_c20190701__dei--LegalEntityAxis__custom--AGPAllianceGlobalPartnersMember_zJqwl1LzcXb5" title="Combined purchase price per share">1.51</span> per share and paid AGP a sales commission of approximately $<span id="xdx_905_ecustom--PaymentOfSalesCommission_pn5n6_c20190106__20190107__us-gaap--TypeOfArrangementAxis__custom--TwoThousandNinteenATMFacilityMember__dei--LegalEntityAxis__custom--AGPAllianceGlobalPartnersMember_zKrYzQkr3Xna" title="Payment of sales commission">0.8</span> million related to those
shares. The agreement was fully utilized and terminated on December 8, 2020.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"/>



<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">On
November 20, 2020, the Company entered into another At the Market Offering Agreement with AGP (the &#8220;2020 ATM Facility&#8221;),
having capacity up to $<span id="xdx_901_eus-gaap--DeferredOfferingCosts_iI_pn5n6_c20201120_zrwXDFFFR2Ha" title="Deferred Offering Costs">100.0</span> million. On December 4, 2020, the Company filed a prospectus with the Securities and Exchange Commission
whereby, the Company could issue and sell to or through AGP, acting as agent and/or principal, shares of the Company&#8217;s common stock
having an aggregate offering price of up to $<span id="xdx_900_ecustom--ProceedsFromInitialPublicOffering_pn5n6_c20201118__20201120__us-gaap--TypeOfArrangementAxis__custom--TwoThousandTwentyATMFacilityMember__dei--LegalEntityAxis__custom--AGPAllianceGlobalPartnersMember_z9CC9Z2TQ58c" title="Proceeds from initial public offering">50.0</span> million. From inception of the 2020 ATM Facility through January 31, 2022, the Company
had sold and issued an aggregate of <span id="xdx_900_eus-gaap--SaleOfStockNumberOfSharesIssuedInTransaction_pid_c20210501__20220131__us-gaap--TypeOfArrangementAxis__custom--TwoThousandTwentyATMFacilityMember__dei--LegalEntityAxis__custom--AGPAllianceGlobalPartnersMember_zxlJY405TmBk" title="Number of common stock shares sold">17,179,883</span> shares of its common stock with an aggregate market value of $<span id="xdx_90F_eus-gaap--SaleOfStockConsiderationReceivedPerTransaction_pn5n6_c20210501__20220131__us-gaap--TypeOfArrangementAxis__custom--TwoThousandTwentyATMFacilityMember__dei--LegalEntityAxis__custom--AGPAllianceGlobalPartnersMember_zpcxC0lXPuCk" title="Proceeds from issuance or sale of equity, net of issuance costs">50.0</span> million at an average
price of $<span id="xdx_90E_eus-gaap--SaleOfStockPricePerShare_iI_pid_c20220131__us-gaap--TypeOfArrangementAxis__custom--TwoThousandTwentyATMFacilityMember__dei--LegalEntityAxis__custom--AGPAllianceGlobalPartnersMember_z2SqAYI9mROl" title="Combined purchase price per share">2.91</span> per share and paid AGP a sales commission of approximately $<span id="xdx_905_ecustom--PaymentOfSalesCommission_pn5n6_c20210501__20220131__us-gaap--TypeOfArrangementAxis__custom--TwoThousandTwentyATMFacilityMember__dei--LegalEntityAxis__custom--AGPAllianceGlobalPartnersMember_zjuJmXNgWEO5" title="Payment of sales commission">1.6</span> million related to those shares. A prospectus supplement
was filed on January 10, 2022 to allow the Company to sell an additional $<span id="xdx_905_ecustom--PaymentOfSalesCommission_pn5n6_c20210501__20220131__us-gaap--TypeOfArrangementAxis__custom--TwoThousandTwentyATMFacilityMember_zCFYS4sCujfi" title="Payment of sales commission">25.0</span> million (or an aggregate of $<span id="xdx_909_eus-gaap--SaleOfStockConsiderationReceivedPerTransaction_pn5n6_c20210501__20220131__us-gaap--TypeOfArrangementAxis__custom--TwoThousandTwentyATMFacilityMember_zciOEyO60asf">75.0</span> million) under the 2020
ATM Facility, none of which has been sold to date.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Equity
Line Common Stock Purchase Agreements</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">On
October 24, 2019, the Company entered into a common stock purchase agreement with Aspire Capital which provided that, subject to certain
terms, conditions and limitations, Aspire Capital was committed to purchase up to an aggregate of $<span id="xdx_902_ecustom--StockIssuedDuringPeriodValueIssuedForCommitmentFee_pn5n6_c20191023__20191024__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember__srt--RangeAxis__srt--MaximumMember_zgtUWceEB0Q8" title="Aggregate purchase of common stock">10.0</span> million shares of the Company&#8217;s
common stock over a 30-month period. Through September 18, 2020, the Company had sold an aggregate of <span id="xdx_909_eus-gaap--SaleOfStockNumberOfSharesIssuedInTransaction_pid_c20200914__20200918__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_zJuEfYsjX7Fc" title="Number of common stock shares sold">6,424,205</span> shares of common stock
with an aggregate market value of $<span id="xdx_903_eus-gaap--SaleOfStockConsiderationReceivedPerTransaction_pn5n6_c20200914__20200918__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_zbAfuslQKKgl" title="Proceeds from issuance or sale of equity, net of issuance costs">4.0</span> million at an average price of $<span id="xdx_90A_eus-gaap--SaleOfStockPricePerShare_iI_pid_c20200918__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_z2PvKI00qNC4" title="Combined purchase price per share">0.63</span> per share pursuant to this common stock purchase agreement,
including <span id="xdx_900_eus-gaap--SaleOfStockNumberOfSharesIssuedInTransaction_pid_c20200501__20210430__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementOneMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_zLzAqaMsuZMl" title="Number of common stock shares sold">5,025,000</span> shares in fiscal year 2021 with an aggregate market value of $<span id="xdx_902_eus-gaap--SaleOfStockConsiderationReceivedPerTransaction_pn5n6_c20200501__20210430__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementOneMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_zZ2rT7ofQ4hg" title="Proceeds from issuance or sale of equity, net of issuance costs">2.9</span> million at an average price of $<span id="xdx_909_eus-gaap--SaleOfStockPricePerShare_iI_pid_c20210430__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementOneMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_zpsbcKPZwiAi" title="Combined purchase price per share">0.57</span> per share.
The agreement was fully utilized and terminated on September 18, 2020.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">On
September 18, 2020, the Company entered into a new common stock purchase agreement with Aspire Capital which provided that, subject to
certain terms, conditions and limitations, Aspire Capital was committed to purchase up to an aggregate of $<span id="xdx_90E_ecustom--StockIssuedDuringPeriodValueIssuedForCommitmentFee_pn5n6_c20200914__20200918__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_zvEikLWYvK4d" title="Aggregate purchase of common stock">12.5</span> million shares of the
Company&#8217;s common stock over a 30-month period subject to a limit of <span id="xdx_901_ecustom--PercentageOfOutstandingCommonStockLimitForShareholderApproval_pid_dp_uPure_c20200914__20200918__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_zAWYU80dtFy4" title="Percentage of outstanding common stock">19.99</span>% of the outstanding common stock on the date of the agreement
if the price did not exceed a specified price in the agreement. The number of shares the Company could issue within the 19.99% limit
was <span id="xdx_904_ecustom--StockIssuedDuringPeriodSharesCanBeIssuedBasedUponOutstandingPercentage_pid_c20200914__20200918__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_zZxo3TAECS3i" title="Shares can be issued based upon outstanding percentage">3,722,251</span> shares without shareholder approval. Shareholder approval was received at the Company&#8217;s annual meeting of shareholders
on December 23, 2020 for the sale of <span id="xdx_90E_ecustom--NumberOfAdditionalSharesThatCanBeIssuedUponShareholderApproval_pid_c20201222__20201223__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_zw4qynmfrBfi" title="Additional sales of common stock shares sold">9,864,706</span> additional shares of common stock to Aspire Capital, which exceeded the <span id="xdx_902_ecustom--PercentageOfOutstandingCommonStockLimitForShareholderApproval_pid_dp_uPure_c20201222__20201223__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_zSefBVri8Fj3" title="Percentage of outstanding common stock">19.99</span>% limit of
the outstanding common stock on the date of the agreement. Through January 31, 2022, the Company had sold an aggregate of <span id="xdx_902_eus-gaap--SaleOfStockNumberOfSharesIssuedInTransaction_c20210730__20210731__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_pdd" title="Number of common stock shares sold">3,722,251</span> shares
of common stock with an aggregate market value of $<span id="xdx_90D_eus-gaap--SaleOfStockConsiderationReceivedPerTransaction_c20210730__20210731__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_pn5n6" title="Proceeds from issuance or sale of equity, net of issuance costs">11.8</span> million at an average price of $<span id="xdx_904_eus-gaap--SaleOfStockPricePerShare_iI_pid_c20211031__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_zKVSQQxuzm59" title="Combined purchase price per share">3.17</span> per share pursuant to this common stock
purchase agreement with approximately $<span id="xdx_905_eus-gaap--SaleOfStockConsiderationReceivedPerTransaction_pn5n6_c20220130__20220131__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_z5ObdanhfAy8" title="Proceeds from issuance or sale of equity, net of issuance costs">1.0</span> million remaining on the facility as of January 31, 2022.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<span></span>
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<span style="display: none;">v3.22.0.1</span><table class="report" border="0" cellspacing="2" id="idm140163165289368">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Summary of Significant Accounting Policies<br></strong></div></th>
<th class="th" colspan="1">9 Months Ended</th>
</tr>
<tr><th class="th"><div>Jan. 31, 2022</div></th></tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AccountingPoliciesAbstract', window );"><strong>Accounting Policies [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SignificantAccountingPoliciesTextBlock', window );">Summary of Significant Accounting Policies</a></td>
<td class="text"><p id="xdx_80C_eus-gaap--SignificantAccountingPoliciesTextBlock_zDdxXQXSsfD2" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(2)
<span id="xdx_82F_zJmLXtGm5CU2">Summary of Significant Accounting Policies</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p id="xdx_84C_eus-gaap--ConsolidationPolicyTextBlock_zBFiVSgwIaz9" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>(a)
<span id="xdx_865_zDBhF8X9gW9c">Consolidation</span></i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
accompanying consolidated financial statements include the accounts of the Company and its majority-owned subsidiaries. All significant
intercompany balances and transactions have been eliminated in consolidation.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p id="xdx_841_eus-gaap--UseOfEstimates_z7LQTREayaS5" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>(b)
<span id="xdx_86A_zL8LNwapiU0c">Use of Estimates</span></i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
preparation of the consolidated financial statements requires management of the Company to make a number of estimates and assumptions
relating to the reported amounts of assets and liabilities at the date of the consolidated financial statements and the reported amounts
of revenues and expenses during the period. Significant items subject to such estimates and assumptions include, among other items, valuations,
purchase price allocations and contingent consideration related to business combinations, expected future cash flows including growth
rates, discount rates, terminal values and other assumptions and estimates used to evaluate the recoverability of long-lived assets,
goodwill and other intangible assets and the related amortization methods and periods, estimated costs to complete projects and percentage
of completion of customer contracts for purposes of revenue recognition. Actual results could differ from those estimates.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"/>



<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p id="xdx_84A_eus-gaap--CashAndCashEquivalentsRestrictedCashAndCashEquivalentsPolicy_zN4kSXA5PL1d" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>(c)
<span id="xdx_865_zh6i9EThGaZ2">Cash, Cash Equivalents, Restricted Cash and Security Agreements</span></i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Cash
and Cash Equivalents</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company considers all highly liquid investments with a maturity of three months or less when purchased to be cash equivalents. The Company
invests excess cash in a money market account. The following table summarizes cash and cash equivalents as of January 31, 2022 and April
30, 2021:</span></p>

<p id="xdx_893_eus-gaap--ScheduleOfCashAndCashEquivalentsTableTextBlock_z1g40OImlpYg" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;<span id="xdx_8BC_zp9nKkjhsHHl" style="display: none">Schedule of Cash and Cash Equivalents</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">January
    31, 2022</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">April
    30, 2021</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="6" style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(in
    thousands)</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 64%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Checking
    and savings accounts</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td id="xdx_98E_eus-gaap--CashAndCashEquivalentsAtCarryingValue_c20220131__us-gaap--CashAndCashEquivalentsAxis__custom--CheckingAndSavingsAccountsMember_pn3n3" style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right" title="Cash and cash equivalents"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">1,519</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td id="xdx_98D_eus-gaap--CashAndCashEquivalentsAtCarryingValue_c20210430__us-gaap--CashAndCashEquivalentsAxis__custom--CheckingAndSavingsAccountsMember_pn3n3" style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right" title="Cash and cash equivalents"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">1,850</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Money
    market account</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td id="xdx_988_eus-gaap--CashAndCashEquivalentsAtCarryingValue_c20220131__us-gaap--CashAndCashEquivalentsAxis__us-gaap--MoneyMarketFundsMember_pn3n3" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Cash and cash equivalents"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">61,935</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td id="xdx_989_eus-gaap--CashAndCashEquivalentsAtCarryingValue_c20210430__us-gaap--CashAndCashEquivalentsAxis__us-gaap--MoneyMarketFundsMember_pn3n3" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Cash and cash equivalents"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">81,178</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td id="xdx_982_eus-gaap--CashAndCashEquivalentsAtCarryingValue_c20220131_pn3n3" style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Cash and cash equivalents"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">63,454</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td id="xdx_98E_eus-gaap--CashAndCashEquivalentsAtCarryingValue_c20210430_pn3n3" style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Cash and cash equivalents"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">83,028</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  </table>

<p id="xdx_8AA_zetvsuuSeyZf" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Restricted
Cash and Security Agreements</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company has a letter of credit agreement with Santander Bank, N.A. (&#8220;Santander&#8221;). Cash of $<span id="xdx_90E_eus-gaap--Deposits_c20220131__us-gaap--TypeOfArrangementAxis__custom--RestrictedCashAndSecurityAgreementsMember__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--SantanderBankMember__us-gaap--ShortTermDebtTypeAxis__us-gaap--LetterOfCreditMember_pp0p0" title="Deposits">157,000</span> is on deposit at Santander
and serves as security for a letter of credit issued by Santander for the lease of warehouse/office space in Monroe Township, New Jersey.
This agreement cannot be extended beyond July 31, 2025 and is cancellable at the discretion of Santander.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Santander
also issued two letters of credit to subsidiaries of Enel Green Power (&#8220;EGP&#8221;) pursuant to the Company&#8217;s contracts with
EGP. The first letter of credit was issued in the amount of $<span id="xdx_906_eus-gaap--LettersOfCreditOutstandingAmount_c20220131__us-gaap--TypeOfArrangementAxis__custom--RestrictedCashAndSecurityAgreementsMember__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--SantanderBankMember__us-gaap--ShortTermDebtTypeAxis__custom--LetterOneMember_pp0p0">126,000
</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">that will be released 12 months after the PB3
PowerBuoy<sup>&#174; </sup>(&#8220;PB3&#8221;) is fully deployed. The second letter of credit was issued in the amount of $<span id="xdx_90C_eus-gaap--LettersOfCreditOutstandingAmount_c20220131__us-gaap--TypeOfArrangementAxis__custom--RestrictedCashAndSecurityAgreementsMember__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--SantanderBankMember__us-gaap--ShortTermDebtTypeAxis__custom--LetterTwoMember_pp0p0">645,000
</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">and was reduced to $<span id="xdx_908_eus-gaap--LettersOfCreditOutstandingAmount_c20200831__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--SantanderBankMember__us-gaap--ShortTermDebtTypeAxis__custom--LetterTwoMember__us-gaap--AwardDateAxis__custom--AugustTwentyTwentyMember_pp0p0">323,000
</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">in August 2020. The second letter of credit will
be reduced by $<span id="xdx_900_ecustom--LettersOfCreditIssuedAmount_iI_pp0p0_c20220131__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--SantanderBankMember__us-gaap--ShortTermDebtTypeAxis__custom--LetterTwoMember_zBZcN1vaN5D3" title="Letters of credit issued amount">259,000
</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">once the PB3 is fully deployed and passes
final acceptance testing. The remaining restricted amount of $<span id="xdx_901_ecustom--LettersOfCreditIssuedAmount_iI_pp0p0_c20220131__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--SantanderBankMember_zY2nQsgGT38a" title="Letters of credit issued amount">64,000
</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">will be released 12 months after the buoy
is fully deployed.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p id="xdx_89F_eus-gaap--ScheduleOfRestrictedCashAndCashEquivalentsTextBlock_zFgX8DyXBl54" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
following table provides a reconciliation of cash, cash equivalents and restricted cash reported within the Consolidated Balance Sheets
that total to the same amounts shown in the Consolidated Statements of Cash Flows.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;<span id="xdx_8B1_zzRbhmGQtXKi" style="display: none">Schedule of Cash and Cash Equivalents and Restricted Cash</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" id="xdx_499_20220131_zWmhr3VYpfF6" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">January
    31, 2022</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" id="xdx_499_20210430_zeSCmu5tUIAl" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">April
    30, 2021</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="6" style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(in
    thousands)</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_40E_eus-gaap--CashAndCashEquivalentsAtCarryingValue_iI_pn3n3" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 64%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Cash
    and cash equivalents</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">63,454</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">83,028</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_401_eus-gaap--RestrictedCashCurrent_iI_pn3n3" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Restricted
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    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">384</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Restricted
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  </table>

<p id="xdx_8A8_ztfYL56COu66" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p id="xdx_841_eus-gaap--ConcentrationRiskCreditRisk_zLv29a9Vu6D1" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>(d)
<span id="xdx_860_zscMqxtILrm2">Concentration of Credit Risk</span></i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Financial
instruments that potentially subject the Company to credit risk consist principally of accounts receivable and cash and cash equivalents.
The Company believes that its current contracts do not represent a risk of collectability on its receivables. The Company invests its
excess cash in a money market account and does not believe that it is exposed to any significant risks related to its cash and money
market accounts. Cash and cash equivalents are also maintained at foreign financial institutions. Cash and cash equivalents in foreign
financial institutions as of January 31, 2022 was $<span id="xdx_901_eus-gaap--CashAndCashEquivalentsAtCarryingValue_c20220131__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--ForeignFinancialInstitutionsMember_pp0p0" title="Cash and Cash Equivalents, at Carrying Value">30,000</span>.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"/>



<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p id="xdx_896_eus-gaap--ScheduleOfRevenueByMajorCustomersByReportingSegmentsTableTextBlock_zE4Zaw2bCATl" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
table below shows the amount of the Company&#8217;s revenues derived from customers whose revenues accounted for at least 10% of the
Company&#8217;s consolidated revenues for at least one of the periods indicated:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;<span id="xdx_8BF_zpKS8GyJEw06" style="display: none">Schedule of Revenue by Major Customers by Reporting Segments</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
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  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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  <tr id="xdx_408_eus-gaap--RevenueFromContractWithCustomerExcludingAssessedTax_pn3n3_hus-gaap--ConcentrationRiskByBenchmarkAxis__us-gaap--SalesRevenueNetMember__us-gaap--ConcentrationRiskByTypeAxis__us-gaap--CustomerConcentrationRiskMember__srt--MajorCustomersAxis__custom--EniSPAMember_zki3jOC14VUc" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 36%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Eni
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  <tr id="xdx_402_eus-gaap--RevenueFromContractWithCustomerExcludingAssessedTax_pn3n3_hus-gaap--ConcentrationRiskByBenchmarkAxis__us-gaap--SalesRevenueNetMember__us-gaap--ConcentrationRiskByTypeAxis__us-gaap--CustomerConcentrationRiskMember__srt--MajorCustomersAxis__custom--EGPMember_zajw0pFUuPlk" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
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  <tr id="xdx_406_eus-gaap--RevenueFromContractWithCustomerExcludingAssessedTax_pn3n3_hus-gaap--ConcentrationRiskByBenchmarkAxis__us-gaap--SalesRevenueNetMember__us-gaap--ConcentrationRiskByTypeAxis__us-gaap--CustomerConcentrationRiskMember__srt--MajorCustomersAxis__custom--ACETMember_zGXHpKdgpmu2" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
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  <tr id="xdx_406_eus-gaap--RevenueFromContractWithCustomerExcludingAssessedTax_pn3n3_hus-gaap--ConcentrationRiskByBenchmarkAxis__us-gaap--SalesRevenueNetMember__us-gaap--ConcentrationRiskByTypeAxis__us-gaap--CustomerConcentrationRiskMember__srt--MajorCustomersAxis__custom--ValarisFNIMember_zGv69smIwPYb" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Valaris
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    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">7</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span style="-sec-ix-hidden: xdx2ixbrl1038">&#8212;</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span style="-sec-ix-hidden: xdx2ixbrl1040">&#8212;</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_405_eus-gaap--RevenueFromContractWithCustomerExcludingAssessedTax_pn3n3_hus-gaap--ConcentrationRiskByBenchmarkAxis__us-gaap--SalesRevenueNetMember__us-gaap--ConcentrationRiskByTypeAxis__us-gaap--CustomerConcentrationRiskMember__srt--MajorCustomersAxis__custom--BrighamYoungUniversityMember_zB91P7eS4Nll" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Brigham
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    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">66</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span style="-sec-ix-hidden: xdx2ixbrl1043">&#8212;</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">66</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span style="-sec-ix-hidden: xdx2ixbrl1045">&#8212;</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_407_eus-gaap--RevenueFromContractWithCustomerExcludingAssessedTax_pn3n3_hus-gaap--ConcentrationRiskByBenchmarkAxis__us-gaap--SalesRevenueNetMember__us-gaap--ConcentrationRiskByTypeAxis__us-gaap--CustomerConcentrationRiskMember__srt--MajorCustomersAxis__custom--NipponKaiyoMember_zB2to4fwMr6e" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Nippon
    Kaiyo <span id="xdx_F49_z1y4V90JpmDd">(2)</span></span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">78</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span style="-sec-ix-hidden: xdx2ixbrl1048">&#8212;</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">78</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span style="-sec-ix-hidden: xdx2ixbrl1050">&#8212;</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_40A_eus-gaap--RevenueFromContractWithCustomerExcludingAssessedTax_pn3n3_hus-gaap--ConcentrationRiskByBenchmarkAxis__us-gaap--SalesRevenueNetMember__us-gaap--ConcentrationRiskByTypeAxis__us-gaap--CustomerConcentrationRiskMember__srt--MajorCustomersAxis__custom--NavalSurfaceWarfareCenterMember_zlqYIer8uzHa" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Naval
    Surface Warfare Center <span id="xdx_F42_zFJYGlZukXIh">(2)</span></span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">98</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span style="-sec-ix-hidden: xdx2ixbrl1053">&#8212;</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">98</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span style="-sec-ix-hidden: xdx2ixbrl1055">&#8212;</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_404_eus-gaap--RevenueFromContractWithCustomerExcludingAssessedTax_pn3n3_hus-gaap--ConcentrationRiskByBenchmarkAxis__us-gaap--SalesRevenueNetMember__us-gaap--ConcentrationRiskByTypeAxis__us-gaap--CustomerConcentrationRiskMember__srt--MajorCustomersAxis__custom--OtherMember_zUrHidpm8dM" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Other
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    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">27</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">260</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">53</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_409_eus-gaap--RevenueFromContractWithCustomerExcludingAssessedTax_pn3n3_z5v4hi74KIla" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
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    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">1,003</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">604</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  </table>


<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif; padding-right: 2.65pt; text-align: right; width: 40%"><span id="xdx_F04_zZURkolW8eg4" style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(1)</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; padding-right: 0.75pt; padding-left: 2.65pt; width: 60%"><span id="xdx_F1C_zMbXUlposoBd" style="font-family: Times New Roman, Times, Serif; font-size: 10pt">3Dent
    related consulting</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: #CCEEFF">
    <td style="font: 10pt Times New Roman, Times, Serif; padding-right: 2.65pt; text-align: right"><span id="xdx_F0C_ztPx7WLQvE09" style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(2)</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; padding-right: 0.75pt; padding-left: 2.65pt"><span id="xdx_F12_zM9DZUJLvCT" style="font-family: Times New Roman, Times, Serif; font-size: 10pt">MAR
    related sales</span></td></tr>
  </table>
<p id="xdx_8A2_zpoEBfu5dakd" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>&#160;</b></span></p>

<p id="xdx_849_eus-gaap--ShareBasedCompensationOptionAndIncentivePlansPolicy_zuPdUUyPHCpd" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>(e)
<span id="xdx_86E_zrwZKoyPUhQ5">Share-Based Compensation</span></i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Costs
resulting from all share-based payment transactions are recognized in the consolidated financial statements at their fair values. The
following table summarizes share-based compensation related to the Company&#8217;s share-based plans by expense category for the three
and nine months ended January 31, 2022 and 2021:</span></p>

<p id="xdx_89D_eus-gaap--ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock_zD5DdwwOJ1E2" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;<span id="xdx_8BF_z6z14Asmywua" style="display: none">Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="font: 10pt Times New Roman, Times, Serif; display: none; vertical-align: bottom">
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<tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">2022</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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    thousands)</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_408_eus-gaap--ShareBasedCompensation_hus-gaap--IncomeStatementLocationAxis__custom--EngineeringAndProductDevelopmentMember_zHoaC2eo4ba1" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 36%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Engineering
    and product development</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 12%; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">91</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_40D_eus-gaap--ShareBasedCompensation_hus-gaap--IncomeStatementLocationAxis__us-gaap--SellingGeneralAndAdministrativeExpensesMember_zxINEzOp9n77" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Selling,
    general and administrative</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">108</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">83</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">313</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">247</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_403_eus-gaap--ShareBasedCompensation_i_pn3n3" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Total
    share-based compensation expense</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">317</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">115</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">338</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  </table>

<p id="xdx_8AE_zUTay3HR9Vs4" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p id="xdx_844_eus-gaap--RevenueFromContractWithCustomerPolicyTextBlock_zrwrCS2Zd6D7" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(f)
<i><span id="xdx_869_z0nOgDU7qY93">Revenue Recognition</span></i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">A
performance obligation is the unit of account for revenue recognition. The Company assesses the goods or services promised in a contract
with a customer and identifies as a performance obligation either: a) a good or service (or a bundle of goods or services) that is distinct;
or b) a series of distinct goods or services that are substantially the same and that have the same pattern of transfer to the customer.
A contract may contain a single or multiple performance obligations. For contracts with multiple performance obligations, the Company
allocates the contracted transaction price to each performance obligation based upon the relative standalone selling price, which represents
the price the Company would sell a promised good or service separately to a customer. The Company determines the standalone selling price
based upon the facts and circumstances of each obligated good or service. The majority of the Company&#8217;s contracts have no observable
standalone selling price since the associated products and services are customized to customer specifications. As such, the standalone
selling price generally reflects the Company&#8217;s forecast of the total cost to satisfy the performance obligation plus an appropriate
profit margin.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
nature of the Company&#8217;s contracts may give rise to several types of variable consideration, including unpriced change orders and
liquidated damages and penalties. Variable consideration can also arise from modifications to the scope of services. Variable consideration
is included in the transaction price to the extent it is probable that a significant reversal of cumulative revenue recognized will not
occur once the uncertainty associated with the variable consideration is resolved. Our estimates of variable consideration and determination
of whether to include such amounts in the transaction price are based largely on our assessment of legal enforceability, performance,
and any other information (historical, current, and forecasted) that is reasonably available to us. There was no variable consideration
as of January 31, 2022 or 2021. The Company presents shipping and handling costs, that occur after control of the promised goods or services
transfer to the customer, as fulfillment costs rather than evaluating whether the shipping and handling activities are promised services
to the customer.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"/>



<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company recognizes revenue when or as it satisfies a performance obligation by transferring a good or service to a customer, either (1)
at a point in time or (2) over time. A good or service is transferred when, or as, the customer obtains control. The evaluation of whether
control of each performance obligation is transferred at a point in time or over time is made at contract inception. Input measures such
as costs incurred or time elapsed are utilized to assess progress against specific contractual performance obligations for the Company&#8217;s
services. The selection of the method to measure progress towards completion requires judgment and is based on the nature of the services
to be provided. For the Company, the input method using costs incurred or time elapsed best represents the measure of progress against
the performance obligations incorporated within the contractual agreements. If estimated total costs on any contract project a loss,
the Company charges the entire estimated loss to operations in the period the loss becomes known. The cumulative effect of revisions
to revenue, estimated costs to complete contracts, including penalties, incentive awards, change orders, claims, anticipated losses,
and others are recorded in the accounting period in which the events indicating a loss are known and the loss can be reasonably estimated.
These loss projects are re-assessed for each subsequent reporting period until the project is complete. Such revisions could occur at
any time and the effects may be material.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company&#8217;s contracts are either cost plus or fixed price contracts. Under cost plus contracts, customers are billed for actual expenses
incurred plus an agreed-upon fee. Under cost plus contracts, a profit or loss on a project is recognized depending on whether actual
costs are more or less than the agreed upon amount.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company has two types of fixed price contracts, firm fixed price and cost-sharing. Under firm fixed price contracts, the Company receives
an agreed-upon amount for providing products and services specified in the contract, and a profit or loss is recognized depending on
whether actual costs are more or less than the agreed upon amount. Under cost-sharing contracts, the fixed amount agreed upon with the
customer is only intended to fund a portion of the costs on a specific project. Under cost sharing contracts, an amount corresponding
to the revenue is recorded in cost of revenues, resulting in gross profit on these contracts of zero. The Company&#8217;s share of the
costs is recorded as product development expense. The Company reports its disaggregation of revenue by contract type since this method
best represents the Company&#8217;s business. For the nine-month periods ended January 31, 2022 and 2021, all of the Company&#8217;s
contracts were classified as firm fixed price.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">As
of January 31, 2022, the Company&#8217;s total remaining performance obligations, also referred to as backlog, totaled $<span id="xdx_908_eus-gaap--RevenueRemainingPerformanceObligation_iI_pn5n6_c20220131_zPQxAxDAE4c2" title="Revenue remaining performance obligation">0.8</span> million.
The Company expects to recognize <span id="xdx_900_ecustom--RevenueRemainingPerformancesObligationPercentage_pid_dp_uPure_c20210501__20220131_zLCFe6fEpFU8" title="Revenue remaining performance obligation, percentage">100</span>% of the remaining performance obligations as revenue over the next twelve months.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company also enters into lease arrangements for its PB3 and our Wave Adaptive Modular Vessels (&#8220;WAM-V&#8221;) with certain customers.
Revenue related to multiple-element arrangements is allocated to lease and non-lease elements based on their relative standalone selling
prices or expected cost plus a margin approach. Lease elements generally include a PB3 and components, while non-lease elements generally
include engineering, monitoring and support services. In the lease arrangement, the customer is provided an option to extend the lease
term or purchase the leased PB3 at some point during and/or at the end of the lease term.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Products
and Solutions Leasing</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company enters into lease arrangements with certain customers for their products and solutions. As of January 31, 2022, the Company had
one lease arrangement with a remaining operating lease term of less than 7 months. Revenue related to multiple-element arrangements is
allocated to lease and non-lease elements based on their relative standalone selling prices or expected cost plus a margin approach.
Lease elements generally include a PB3 and components, while non-lease elements generally include engineering, monitoring and support
services. In the lease arrangement, the customer is provided an option to extend the lease term or purchase the leased PB3 at some point
during and/or at the end of the lease term.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"/>



<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company classifies leases as either operating or financing in accordance with the authoritative accounting guidance contained within
ASC Topic 842, <i>&#8220;Leases&#8221;.</i> At inception of the contract, the Company evaluates the lease against the lease classification
criteria within ASC Topic 842. If the direct financing or sales-type classification criteria are met, then the lease is accounted for
as a finance lease. All other leases are treated as operating leases.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company recognizes revenue from operating lease arrangements generally on a straight-line basis over the lease term which is presented
in Revenues in the Consolidated Statements of Operations. The lease revenue for the nine months ended January 31, 2022 and 2021 was immaterial.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p id="xdx_84E_eus-gaap--EarningsPerSharePolicyTextBlock_zZvX1ipIWb21" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>(g)
<span id="xdx_868_znU2KJI53lPd">Net Loss per Common Share</span></i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Basic
and diluted net loss per common share for all periods presented is computed by dividing net loss by the weighted average number of shares
of common stock and common stock equivalents outstanding during the periods. The pre-funded warrants were determined to be common stock
equivalents and have been included in the weighted average number of shares outstanding for calculation of basic net loss per common
share . Due to the Company&#8217;s net losses, potentially dilutive securities, consisting of options to purchase shares of common stock,
warrants on common stock and unvested restricted stock issued to employees and non-employee directors, were excluded from the diluted
net loss per common share calculation due to their anti-dilutive effect.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">In
computing diluted net loss per common share on the Consolidated Statements of Operations, warrants exercisable for common stock, options
to purchase shares of common stock and non-vested restricted stock issued to employees and non-employee directors, totaling <span id="xdx_909_eus-gaap--AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_c20210501__20220131_pdd" title="Antidilutive securities excluded from computation of earnings per share, amount">6,356,123</span>
and <span id="xdx_90F_eus-gaap--AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_c20200501__20210131_pdd" title="Antidilutive securities excluded from computation of earnings per share, amount">5,221,258</span> for the nine months ended January 31, 2022 and 2021, respectively, were excluded from each of the computations as the effect
would be anti-dilutive due to the Company&#8217;s net losses.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p id="xdx_84E_eus-gaap--NewAccountingPronouncementsPolicyPolicyTextBlock_zjFZOjb69SVc" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>(h)
<span id="xdx_867_zg3Bffmmat3d">Recently Issued Accounting Standards</span></i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">In
June 2016, the Financial Accounting Standards Board (&#8220;FASB&#8221;) issued ASU No. 2016-13, &#8220;<i>Financial Instruments </i>-
<i>Credit Losses (Topic 326), Measurement of Credit Losses on Financial Instruments.&#8221; </i>This amendment replaces the incurred
loss impairment methodology in current GAAP with a methodology that reflects expected credit losses on instruments within its scope,
including trade receivables. This update is intended to provide financial statement users with more decision-useful information about
the expected credit losses. In November 2019, the FASB issued No. 2019-10, <i>Financial Instruments&#8212;Credit Losses (Topic 326),
Derivatives and Hedging (Topic 815), and Leases (Topic 842)</i>, which deferred the effective date of ASU 2016-13 for Smaller Reporting
Companies for fiscal years beginning after December 15, 2022, including interim periods within those fiscal years. The Company is
currently evaluating the impact of the adoption of ASU 2016-13 on its consolidated financial statements.</span></p>

<p id="xdx_853_zsQeUyeZ5Ko5" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

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<span style="display: none;">v3.22.0.1</span><table class="report" border="0" cellspacing="2" id="idm140163162529528">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Account Receivable and Contract Assets<br></strong></div></th>
<th class="th" colspan="1">9 Months Ended</th>
</tr>
<tr><th class="th"><div>Jan. 31, 2022</div></th></tr>
<tr class="re">
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<td class="text">&#160;<span></span>
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</tr>
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<td class="text"><p id="xdx_80B_ecustom--AccountReceivableContractAssetsAndContractLiabilitiesTextBlock_zkx9qyT015w4" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(3)
<span id="xdx_824_zVP50WQzirT3">Account Receivable and Contract Assets</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p id="xdx_893_ecustom--ScheduleOfAccountsReceivableContractAssetsAndContractLiabilitiesTableTextBlock_zX37aYccAexj" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
following provides further details on the balance sheet accounts of accounts receivable and contract assets from contracts with customers:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;<span id="xdx_8B3_zG1WN85sW172" style="display: none">Schedule of Accounts Receivable, Contract Assets and Contract Liabilities</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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<p id="xdx_8A3_z0tmZ0DjSym2" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>&#160;</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Accounts
Receivable</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company grants credit to its customers, generally without collateral, under normal payment terms (typically 30 to 60 days after invoicing).
Generally, invoicing occurs after the related services are performed or control of goods have transferred to the customer. Accounts receivable
represent an unconditional right to consideration arising from the Company&#8217;s performance under contracts with customers. The carrying
value of such receivables represents their estimated realizable value.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"/>



<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Contract
Assets</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Contract
assets include unbilled amounts typically resulting from arrangements whereby the right to payment is conditioned on completing additional
tasks or services for a performance obligation. Significant changes in the contract assets balance during the period were as follows:</span></p>

<p id="xdx_895_eus-gaap--ContractWithCustomerAssetAndLiabilityTableTextBlock_zu9tO89eHz01" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;<span id="xdx_8BC_zY5tgvGeojuj" style="display: none">Schedule of Significant Changes in Contract Assets and Contract Liabilities</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" id="xdx_498_20210501__20220131_zwQ2ZRbPzNdl" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Nine
    months ended January 31, 2022</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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  <tr id="xdx_406_eus-gaap--ContractWithCustomerAssetNet_iNS_pn3n3_di_zRWeyQ6sTHa2" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
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    to receivables from contract assets recognized at the beginning of the period</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 18%; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(190</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">)</span></td></tr>
  <tr id="xdx_40A_eus-gaap--ContractWithCustomerAssetNet_iE_pn3n3_zSo6j0097m1c" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
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    recognized and not billed as of the end of the period</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">407</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_401_eus-gaap--IncreaseDecreaseInContractWithCustomerAsset_iT_pn3n3_zsLykBp0ml1h" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Net
    change in contract assets</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">217</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
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<p id="xdx_8A2_z3gj4aGrrpEg" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

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<span style="display: none;">v3.22.0.1</span><table class="report" border="0" cellspacing="2" id="idm140163162429928">
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<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Other Current Assets<br></strong></div></th>
<th class="th" colspan="1">9 Months Ended</th>
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<tr><th class="th"><div>Jan. 31, 2022</div></th></tr>
<tr class="re">
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<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OtherCurrentAssetsTextBlock', window );">Other Current Assets</a></td>
<td class="text"><p id="xdx_80E_eus-gaap--OtherCurrentAssetsTextBlock_zxbOhOnsA2tl" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(4)
<span id="xdx_82E_zWWy2HdMU7Qf">Other Current Assets</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>&#160;</b></span></p>

<p id="xdx_894_eus-gaap--ScheduleOfOtherCurrentAssetsTableTextBlock_zOb9oIGBliWe" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Other
current assets consisted of the following at January 31, 2022 and April 30, 2021:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;<span id="xdx_8BE_zUQHnlgidtGh" style="display: none">Schedule of Other Current Assets</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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  <tr id="xdx_402_eus-gaap--PrepaidInsurance_iI_pn3n3_maOACz300_z2YxsIiPOxw3" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
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    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">21</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
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<span style="display: none;">v3.22.0.1</span><table class="report" border="0" cellspacing="2" id="idm140163162394504">
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<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Property and Equipment, net<br></strong></div></th>
<th class="th" colspan="1">9 Months Ended</th>
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<tr><th class="th"><div>Jan. 31, 2022</div></th></tr>
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<td class="text">&#160;<span></span>
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<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock', window );">Property and Equipment, net</a></td>
<td class="text"><p id="xdx_809_eus-gaap--PropertyPlantAndEquipmentDisclosureTextBlock_zoHgeImTxWsg" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(5)
<span id="xdx_825_zEsi0YOlGtvk">Property and Equipment, net</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p id="xdx_89B_eus-gaap--PropertyPlantAndEquipmentTextBlock_zkS29BFv5Ahj" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
components of property and equipment, net as of January 31, 2022 and April 30, 2021 consisted of the following:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;<span id="xdx_8BA_zQ9sv7Oqikt5" style="display: none">Schedule of Components of Property and Equipment</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
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    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" id="xdx_498_20220131_zLd1JW1a8JH8" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">January
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  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
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    <td style="font: 10pt Times New Roman, Times, Serif; width: 64%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Equipment</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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  <tr id="xdx_402_eus-gaap--PropertyPlantAndEquipmentGross_iI_pn3n3_hus-gaap--PropertyPlantAndEquipmentByTypeAxis__custom--ComputerEquipmentAndSoftwareMember_zTwHEFIoBx4i" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
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  <tr id="xdx_402_eus-gaap--PropertyPlantAndEquipmentGross_iI_pn3n3_hus-gaap--PropertyPlantAndEquipmentByTypeAxis__custom--OfficeFurnitureAndEquipmentMember_zePmHkVEU5B8" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Office
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    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">341</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
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    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">474</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
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    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left; padding-bottom: 1pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Construction
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    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">15</span></td><td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
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    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">406</span></td><td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
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<p id="xdx_8A7_zX05log2E8hg" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Depreciation
expense was approximately $<span id="xdx_90D_eus-gaap--Depreciation_pn3n3_c20210501__20220131_zwhH3OsO1ep1" title="Depreciation expense">104,000</span> and $<span id="xdx_909_eus-gaap--Depreciation_pn3n3_c20200501__20210131_zTtgmcnN90v1" title="Depreciation expense">106,000</span> for the nine month periods ended January 31, 2022 and 2021, respectively.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"/>



<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections.</p></div>
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<span style="display: none;">v3.22.0.1</span><table class="report" border="0" cellspacing="2" id="idm140163162465864">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Leases<br></strong></div></th>
<th class="th" colspan="1">9 Months Ended</th>
</tr>
<tr><th class="th"><div>Jan. 31, 2022</div></th></tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_DisclosureLeasesAbstract', window );"><strong>Leases</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LesseeOperatingLeasesTextBlock', window );">Leases</a></td>
<td class="text"><p id="xdx_807_eus-gaap--LesseeOperatingLeasesTextBlock_zCfunVCrZRD2" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(6)
<span id="xdx_822_zdMHWb6q1UKg">Leases</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>&#160;</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Lessor
Information</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">As
of January 31, 2022, the Company has one lease which has been classified as an operating lease per accounting guidance contained within
ASC Topic 842,&#8221; <i>Leases&#8221;</i>. The Company&#8217;s remaining term on this operating lease is less than 7 months. The maturity
of lease payments remaining on this lease is immaterial.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Lessee
Information</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company has a lease for its facility located in Monroe Township, New Jersey that is used as warehouse/production space and the Company&#8217;s
principal offices and corporate headquarters. <span id="xdx_90D_eus-gaap--LesseeOperatingLeaseOptionToExtend_c20210501__20220131__srt--StatementGeographicalAxis__custom--MonroeTownshipMember_zoTrr3SiP1Z7" title="Lessee, operating lease, option to extend">The initial lease term is for <span id="xdx_90E_eus-gaap--LesseeOperatingLeaseTermOfContract_c20220131__srt--StatementGeographicalAxis__custom--MonroeTownshipMember" title="Lessee, operating lease, term of contract">seven years</span> which expires in November of 2024 with an option
to extend the lease for another five years.</span> The lease is classified as an operating lease. The operating lease is included in right-of-use
assets, lease liabilities- current and lease liabilities- long-term on the Company&#8217;s Consolidated Balance Sheets.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company also has two leases for properties located in Houston, Texas. The first was acquired as part of the 3Dent acquisition
(see Note 18) that is used as office space. The lease term is for <span id="xdx_90D_eus-gaap--LesseeOperatingLeaseTermOfContract_iI_dtY_c20220131__us-gaap--BusinessAcquisitionAxis__custom--ThreeDentAcquisitionMember_zOEJzlVy1RYh" title="Lessee, operating lease, term of contract">3
</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">years and is set to <span id="xdx_906_eus-gaap--LesseeOperatingLeaseOptionToExtend_c20210501__20220131__us-gaap--BusinessAcquisitionAxis__custom--ThreeDentAcquisitionMember_zqfKMeBDwd8d" title="Lessee, operating lease, option to extend">expire
in January of 2023</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">. The lease is classified as
an operating lease and included in the right-of-use assets, lease liabilities- current and lease liabilities- long-term on the Company&#8217;s
Consolidated Balance Sheets.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
other Houston lease is for additional office space and was renewed for a 12-month term ending on June 30, 2022.
In accordance with ASC 842-20-5-2, since the lease term at the time of renewal was 12 months, the asset was recognized directly
to the profit and loss statement on a straight-line basis and was not recognized as a right-of-use asset.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt; background-color: white">The
Company also has a lease with the University of California Berkeley in Berkeley, California that was acquired as part of the MAR
acquisition (see Note 18). The lease expires on <span id="xdx_90F_eus-gaap--LeaseExpirationDate1_c20210501__20220131__us-gaap--BusinessAcquisitionAxis__custom--ThreeDentAcquisitionMember_zT6osmei8Lh9" title="Lease expiration date">June
30, 2022</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt; background-color: white">. </span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">In
accordance with ASC 842-20-5-2, since the remaining lease term at the time of the acquisition of MAR was less
than 12 months, the asset was recognized directly to the profit and loss statement on a straight-line basis and was not recognized
as a right-of-use asset.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt; background-color: white">Right-of-use
asset and operating lease liabilities are recognized based on the present value of futur</span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">e
minimum lease payments over the lease term at commencement date. When the implicit rate of the lease is not provided or cannot be determined,
the Company uses the incremental borrowing rate based on the information available at the effective date to determine the present value
of future payments. Lease terms may include options to extend or terminate the lease when it is reasonably certain that the Company will
exercise those options. The renewal options have not been included in the lease term as they are not reasonably certain of exercise.
Lease expense for minimum lease payments is recognized on a straight- line basis over the lease term and consists of interest on the
lease liability and the amortization of the right of use asset. Variable lease expenses, if any, are recorded as incurred.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
operating lease cash flow payments for the three months ended January 31, 2022 and 2021 were $<span id="xdx_906_eus-gaap--OperatingLeasePayments_c20211101__20220131_pp0p0" title="Operating lease payments">111,000</span> and $<span id="xdx_900_eus-gaap--OperatingLeasePayments_c20201101__20210131_pp0p0" title="Operating lease payments">91,000</span>, respectively. The
operating lease cash flow payments for the nine months ended January 31, 2022 and 2021 were $<span id="xdx_905_eus-gaap--OperatingLeasePayments_c20210501__20220131_pp0p0" title="Operating lease payments">315,000</span> and $<span id="xdx_907_eus-gaap--OperatingLeasePayments_c20200501__20210131_pp0p0" title="Operating lease payments">259,000</span>, respectively.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"/>



<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p id="xdx_89F_eus-gaap--LeaseCostTableTextBlock_zZrDl53ft1ud" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
components of lease expense in the Consolidated Statements of Operations for the three and nine months ended January 31, 2022 and 2021
were as follows:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;<span id="xdx_8BD_zCe6TVq7bgl2" style="display: none">Schedule of Operating Lease Costs</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
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<tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="6" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Three
    months ended January 31,</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="6" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Nine
    months ended January 31,</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">2022</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">2021</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">2022</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">2021</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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  <tr id="xdx_40B_eus-gaap--OperatingLeaseCost_maLCzBwM_zmSUgfJ9eNI9" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 36%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Operating
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    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 12%; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">92</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 12%; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">238</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_40F_eus-gaap--ShortTermLeaseCost_maLCzBwM_zqBdE4uVBEV2" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Short-term
    lease cost</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">12</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">7</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">22</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">12</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_409_eus-gaap--LeaseCost_iT_pn3n3_mtLCzBwM_zQVUYr6oRHti" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Total
    lease cost</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">104</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">86</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">298</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">250</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  </table>

<p id="xdx_8A1_zt73tT2yM3Wl" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p id="xdx_896_ecustom--ScheduleOfRightofUseAssetsAndLeaseLiabilitiesTableTextBlock_ztFBYrfPIe9h" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Information
related to the Company&#8217;s right-of use assets and lease liabilities as of January 31, 2022 was as follows:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;<span id="xdx_8B8_zitTl4PqwDad" style="display: none">Schedule of Right-of Use Assets and Lease Liabilities</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" id="xdx_490_20220131_zAG3VTEOvvm3" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">January
    31, 2022</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(in
                                            thousands) </span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; text-decoration: underline; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Operating
    lease:</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_40C_eus-gaap--OperatingLeaseRightOfUseAsset_iI_pn3n3" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 80%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Operating
    right-of-use asset, net</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; width: 16%; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">825</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_40F_eus-gaap--OperatingLeaseLiabilityCurrent_iI_pn3n3_maOLLzIil_zpvnlDtVLio1" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; padding-left: 10pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Right-of-use
    liability- current</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">323</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_403_eus-gaap--OperatingLeaseLiabilityNoncurrent_iI_pn3n3_maOLLzIil_zCnU2SCKPiCa" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; padding-left: 10pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Right-of-use
    liability- long term</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">615</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_403_eus-gaap--OperatingLeaseLiability_iTI_pn3n3_mtOLLzIil_zQW5UrsDPMul" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Total
    lease liability</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">938</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Weighted
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    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_904_eus-gaap--OperatingLeaseWeightedAverageRemainingLeaseTerm1_iI_dtY_c20220131_zc9i0zCos5oh" title="Weighted average remaining lease term- operating leases">2.61</span>
                                            years</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Weighted
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    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_90B_eus-gaap--OperatingLeaseWeightedAverageDiscountRatePercent_iI_pid_dp_uPure_c20220131_zzxzmM87Mdeb" title="Weighted average discount rate- operating leases">8.2</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">%</span></td></tr>
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<p id="xdx_8A2_z27mbRdoAv5j" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p id="xdx_89F_eus-gaap--LesseeOperatingLeaseLiabilityMaturityTableTextBlock_zk1Cc1oYnOQ4" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Total
remaining lease payments under the Company&#8217;s operating leases are as follows:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;<span id="xdx_8B1_zWpYTmNFPUk9" style="display: none">Schedule of Future Minimum Lease Payments Under Operating Lease</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" id="xdx_493_20220131_zGKX5lWXUqu" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">January
    31, 2022</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(in
    thousands)</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_408_eus-gaap--LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_iI_pn3n3_maLOLLPzbOq_zplVcKBPaBRe" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 80%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Remainder
    of fiscal year 2022</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 16%; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">99</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_40A_eus-gaap--LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_iI_pn3n3_maLOLLPzbOq_zKlMGr0PknV4" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">2023</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">391</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_401_eus-gaap--LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_iI_pn3n3_maLOLLPzbOq_zTCvMfPcgFi3" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">2024</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">362</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_403_eus-gaap--LesseeOperatingLeaseLiabilityPaymentsDueYearThree_iI_pn3n3_maLOLLPzbOq_ztcFDWbeWcF4" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">2025</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">184</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_407_eus-gaap--LesseeOperatingLeaseLiabilityPaymentsDue_iTI_pn3n3_mtLOLLPzbOq_zM7Ffr6Jyiwh" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Total
    future minimum lease payments</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">1,036</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_408_eus-gaap--LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_iNI_pn3n3_di_zxIt73wmWnR4" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Less
    imputed interest</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(98</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">)</span></td></tr>
  <tr id="xdx_401_eus-gaap--OperatingLeaseLiability_iI_pn3n3" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Total</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">938</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
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<p id="xdx_8A8_zKxnbUNqe7n5" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"/>



<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<span></span>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The entire disclosure for operating leases of lessee. Includes, but is not limited to, description of operating lease and maturity analysis of operating lease liability.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -URI http://asc.fasb.org/subtopic&amp;trid=77888251<br></p></div>
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<span style="display: none;">v3.22.0.1</span><table class="report" border="0" cellspacing="2" id="idm140163162501768">
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<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Accrued Expenses<br></strong></div></th>
<th class="th" colspan="1">9 Months Ended</th>
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<tr><th class="th"><div>Jan. 31, 2022</div></th></tr>
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<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AccountsPayableAndAccruedLiabilitiesDisclosureTextBlock', window );">Accrued Expenses</a></td>
<td class="text"><p id="xdx_808_eus-gaap--AccountsPayableAndAccruedLiabilitiesDisclosureTextBlock_zTj6eYHyQ82e" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(7)
<span id="xdx_82A_zjg4175tMeLk">Accrued Expenses</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>&#160;</b></span></p>

<p id="xdx_895_eus-gaap--ScheduleOfAccruedLiabilitiesTableTextBlock_z1TUMTLUEYTk" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Accrued
expenses consisted of the following at January 31, 2022 and April 30, 2021:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;<span id="xdx_8B1_zwqSHtG4zde8" style="display: none">Schedule of Accrued Expenses</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
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    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" id="xdx_495_20220131_z1r0lzKjL3N4" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">January
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    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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<p id="xdx_8AB_zoh2YUoFwzf5" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"/>



<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

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<span style="display: none;">v3.22.0.1</span><table class="report" border="0" cellspacing="2" id="idm140163162517736">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Warrants<br></strong></div></th>
<th class="th" colspan="1">9 Months Ended</th>
</tr>
<tr><th class="th"><div>Jan. 31, 2022</div></th></tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_DisclosureWarrantsAbstract', window );"><strong>Warrants</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_WarrantDisclosureTextBlock', window );">Warrants</a></td>
<td class="text"><p id="xdx_805_ecustom--WarrantDisclosureTextBlock_zAqjhc3JX067" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(8)
<span id="xdx_822_zp3b90MKJKUd">Warrants</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Liability
Classified Warrants</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">On
June 2, 2016, the Company entered into a securities purchase agreement, which was amended on June 7, 2016 (as amended, the &#8220;June
Purchase Agreement&#8221;) with certain institutional purchasers (the &#8220;June Purchasers&#8221;). Pursuant to the terms of the June
Purchase Agreement, the Company sold an aggregate of <span id="xdx_902_eus-gaap--SaleOfStockNumberOfSharesIssuedInTransaction_pid_c20160601__20160602__us-gaap--TypeOfArrangementAxis__custom--JunePurchaseAgreementMember_zdhIBEnDbcRe" title="Number of common stock shares sold">20,850</span> shares of Common Stock together with warrants to purchase up to an aggregate
of <span id="xdx_90D_eus-gaap--ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights_iI_pid_c20160602__us-gaap--TypeOfArrangementAxis__custom--JunePurchaseAgreementMember_zXg1olcZgxY7" title="Purchase of warrants">7,298</span> shares of Common Stock. Each share of common stock was sold together with a warrant to purchase <span id="xdx_902_eus-gaap--ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight_iI_pid_c20160602__us-gaap--TypeOfArrangementAxis__custom--JunePurchaseAgreementMember_zmwqblH8CCLf" title="Purchase of common stock warrants">0.35</span> of a share of common stock
at a combined purchase price of $<span id="xdx_90F_ecustom--CommonStockCombinedPurchasePricePerShare_iI_pid_c20160602__us-gaap--TypeOfArrangementAxis__custom--JunePurchaseAgreementMember_zjRgijf2CZK4" title="Common stock combined purchase price per share">92.00</span>. The warrants have an exercise price of $<span id="xdx_906_eus-gaap--ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_iI_pid_c20160602__us-gaap--TypeOfArrangementAxis__custom--JunePurchaseAgreementMember_zy1QeqkOWR52" title="Exercise price of warrants">121.60</span> per share, became exercisable on December 3, 2016
(&#8220;Initial Exercise Date&#8221;), and expired on December 3, 2021, <span id="xdx_908_eus-gaap--WarrantsAndRightsOutstandingTerm_iI_dc_c20160602__us-gaap--TypeOfArrangementAxis__custom--JunePurchaseAgreementMember_zfh3ZLSZbe9l" title="Warrants and rights outstanding, term">five years</span> following the Initial Exercise Date. As of the expiration
date, <span id="xdx_900_ecustom--NumberOfExercisedWarrants_iI_pid_dn_c20160602__us-gaap--TypeOfArrangementAxis__custom--JunePurchaseAgreementMember_zAewyaW9hg9k" title="Number of exercised warrants">none</span> of the warrants had been exercised.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">On
July 22, 2016, the Company entered into a Second Amendment to the Purchase Agreement (the &#8220;Second Amended Purchase Agreement&#8221;)
with certain institutional purchasers (the &#8220;July Purchasers&#8221;). Pursuant to the terms of the Second Amended Purchase Agreement,
the Company sold an aggregate of <span id="xdx_90E_eus-gaap--SaleOfStockNumberOfSharesIssuedInTransaction_pid_c20160721__20160722__us-gaap--TypeOfArrangementAxis__custom--SecondAmendedPurchaseAgreementMember_zGHYMDcO7SY">29,750
</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">shares of Common Stock together with warrants
to purchase up to an aggregate of <span id="xdx_905_eus-gaap--ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights_iI_pid_c20160722__us-gaap--TypeOfArrangementAxis__custom--SecondAmendedPurchaseAgreementMember_zVPFyz5bHLW">8,925
</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">shares of Common Stock. Each share of common
stock was sold together with a warrant to purchase <span id="xdx_908_eus-gaap--ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight_iI_pid_c20160722__us-gaap--TypeOfArrangementAxis__custom--SecondAmendedPurchaseAgreementMember_zcI6OyKq7aci">0.30
</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">of a share of common stock at a combined purchase
price of $<span id="xdx_904_ecustom--CommonStockCombinedPurchasePricePerShare_iI_pid_c20160722__us-gaap--TypeOfArrangementAxis__custom--SecondAmendedPurchaseAgreementMember_zxCP97f4Mi6i">135.00</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">.
The warrants were exercisable immediately at an exercise price of $<span id="xdx_905_eus-gaap--ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_iI_pid_c20160722__us-gaap--TypeOfArrangementAxis__custom--SecondAmendedPurchaseAgreementMember_z5YlmAP0zq5h">187.20
</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">per share. The warrants expired on <span id="xdx_90B_eus-gaap--WarrantsAndRightsOutstandingMaturityDate_iI_dd_c20160722__us-gaap--TypeOfArrangementAxis__custom--SecondAmendedPurchaseAgreementMember_z4Vz2et7jnQ">January
23, 2022</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">, the fifth (<span id="xdx_90A_eus-gaap--WarrantsAndRightsOutstandingTerm_iI_dtY_c20160722__us-gaap--TypeOfArrangementAxis__custom--SecondAmendedPurchaseAgreementMember_zyhdpDZV8GNh">5</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">th)
anniversary of the initial exercise date of January 23, 2017. As of the expiration date, <span id="xdx_902_ecustom--NumberOfExercisedWarrants_iI_pid_dn_c20160722__us-gaap--TypeOfArrangementAxis__custom--SecondAmendedPurchaseAgreementMember_zOJTElIUBnZj">none
</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">of the warrants had been exercised.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Equity
Classified Warrants</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">On
April 8, 2019, the Company issued and sold <span id="xdx_903_eus-gaap--SaleOfStockNumberOfSharesIssuedInTransaction_pid_c20190407__20190408_zh7i4PrcXq6b" title="Number of common stock shares sold">1,542,000</span> shares of common stock and pre-funded warrants to purchase up to <span id="xdx_90F_eus-gaap--ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights_iI_pid_c20190408__us-gaap--StatementEquityComponentsAxis__custom--PreFundedWarrantsMember_znGb5S4Taub8" title="Purchase of warrants">3,385,680</span> shares
of common stock and common warrants to purchase up to <span id="xdx_901_eus-gaap--ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights_iI_pid_c20190408__us-gaap--StatementEquityComponentsAxis__custom--CommonWarrantsMember_zjLUTX0mFJ89" title="Purchase of warrants">4,927,680</span> shares of our common stock in an underwritten public offering. The public
offering price for the pre-funded warrants was equal to the public offering price of the common stock, less the $<span id="xdx_908_eus-gaap--ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_iI_pid_c20190408__us-gaap--StatementEquityComponentsAxis__custom--PreFundedWarrantsMember_zf5NZT0Xb6uh" title="Exercise price of warrants">0.01</span> per share exercise
price of each warrant. The pre-funded warrants have no expiration date. As of January 31, 2022, all of the pre-funded warrants had been
exercised. The common stock warrants have an exercise price of $<span id="xdx_905_eus-gaap--ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_iI_pid_c20190408__us-gaap--StatementEquityComponentsAxis__custom--CommonWarrantsMember_zY3lQEdmPMd" title="Exercise price of warrants">3.85</span> per share and expire <span id="xdx_903_eus-gaap--WarrantsAndRightsOutstandingTerm_iI_dc_c20190408__us-gaap--StatementEquityComponentsAxis__custom--CommonWarrantsMember_zVPqRLMLYEfk" title="Warrants and rights outstanding, term">five years</span> from the issuance date. As of January
31, 2022, all of the common warrants had been exercised.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company accounts for warrants issued in connection with its June 2016 and July 2016 public offerings in accordance with the guidance
on &#8220;<i>Accounting for Certain Financial Instruments with Characteristics of Both Liabilities and Equity</i>&#8221; in Topic 480
which provides that the Company classify the warrant instruments as a liability at its fair value. The warrant liabilities are subject
to re-measurement at each balance sheet date using the Black-Scholes option pricing model. The June 2016 and July 2016 warrants contained
a feature whereby they could require the transfer of assets and therefore are classified as a liability award in accordance with the
guidance in Topic 480. The warrants were all expired as of January 31, 2022 and had a value near zero as of </span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">April 30, 2021. The pre-funded and
common warrants issued in the Company&#8217;s April 8, 2019 public offering did not meet the criteria to be classified as a liability
award and therefore were treated as an equity award and recorded as a component of shareholders&#8217; equity in the Consolidated Balance
Sheets.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"/>



<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<span></span>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
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<span style="display: none;">v3.22.0.1</span><table class="report" border="0" cellspacing="2" id="idm140163162501768">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Paycheck Protection Program Loan<br></strong></div></th>
<th class="th" colspan="1">9 Months Ended</th>
</tr>
<tr><th class="th"><div>Jan. 31, 2022</div></th></tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_DebtDisclosureAbstract', window );"><strong>Debt Disclosure [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_DebtDisclosureTextBlock', window );">Paycheck Protection Program Loan</a></td>
<td class="text"><p id="xdx_801_eus-gaap--DebtDisclosureTextBlock_zogtgjNXwXBa" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(9)
<span id="xdx_82E_zZh36Vz1giuh">Paycheck Protection Program Loan</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>&#160;</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">On
March 27, 2020, the U.S. Government passed into law the Coronavirus Aid, Relief and Economic Security Act, or the (&#8220;CARES Act&#8221;).
On May 3, 2020, the Company signed a Paycheck Protection Program (&#8220;PPP&#8221;) loan with Santander as the lender for approximately
$<span id="xdx_907_eus-gaap--ProceedsFromLoanOriginations1_c20200501__20200503__us-gaap--TypeOfArrangementAxis__custom--PaycheckProtectionProgramMember_pp0p0" title="Proceeds from loan originations">890,000</span> in support through the Small Business Association (&#8220;SBA&#8221;) under the PPP Loan. The PPP Loan was unsecured and evidenced
by a note in favor of Santander as the lender and governed by a Loan Agreement with Santander. The Company received the proceeds on May
5, 2020.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_906_ecustom--DebtForgivenessDescription_c20200501__20200503__us-gaap--TypeOfArrangementAxis__custom--PaycheckProtectionProgramMember_zBmMYTCywIXf" title="Debt forgiveness, description">The
Company filed its loan forgiveness application at the end of February 2021 asking for <span id="xdx_90C_eus-gaap--DebtInstrumentInterestRateStatedPercentage_iI_pid_dp_c20200503__us-gaap--TypeOfArrangementAxis__custom--PaycheckProtectionProgramMember_zPsNYjhcoO9j" title="Debt interest rate">100</span>% forgiveness of the loan. In June 2021, the
Company was informed that its application was approved, and that the loan is now fully forgiven. The Company recognized a gain on extinguishment
of PPP loan of approximately $<span id="xdx_905_eus-gaap--RepaymentsOfLongTermDebt_pp0p0_c20210202__20211031__us-gaap--TypeOfArrangementAxis__custom--PaycheckProtectionProgramMember_ztMXdZv6vRHj" title="Repayments of long-term debt">890,000</span> during the nine months ended October 31, 2021 as reflected on the Consolidated Statement of Operations.</span></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -URI http://asc.fasb.org/topic&amp;trid=2208564<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 20<br> -Section 50<br> -Paragraph 1B<br> -Subparagraph (h)<br> -URI http://asc.fasb.org/extlink&amp;oid=123466505&amp;loc=SL123495323-112611<br><br>Reference 3: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 20<br> -Section 50<br> -Paragraph 1C<br> -Subparagraph (c)<br> -URI http://asc.fasb.org/extlink&amp;oid=123466505&amp;loc=SL123495334-112611<br><br>Reference 4: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 20<br> -Section 50<br> -Paragraph 1I<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123466505&amp;loc=SL123495371-112611<br><br>Reference 5: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 20<br> -Section 50<br> -Paragraph 1I<br> -Subparagraph (d)<br> -URI http://asc.fasb.org/extlink&amp;oid=123466505&amp;loc=SL123495371-112611<br><br>Reference 6: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 235<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.4-08(c))<br> -URI http://asc.fasb.org/extlink&amp;oid=120395691&amp;loc=d3e23780-122690<br><br>Reference 7: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 20<br> -Section 50<br> -Paragraph 1B<br> -Subparagraph (g)<br> -URI http://asc.fasb.org/extlink&amp;oid=123466505&amp;loc=SL123495323-112611<br><br>Reference 8: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 20<br> -Section 50<br> -Paragraph 1C<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=123466505&amp;loc=SL123495334-112611<br><br>Reference 9: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 20<br> -Section 50<br> -Paragraph 1C<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123466505&amp;loc=SL123495334-112611<br><br>Reference 10: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 20<br> -Section 50<br> -Paragraph 1E<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=123466505&amp;loc=SL123495348-112611<br><br>Reference 11: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 20<br> -Section 50<br> -Paragraph 1B<br> -URI http://asc.fasb.org/extlink&amp;oid=123466505&amp;loc=SL123495323-112611<br><br>Reference 12: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 20<br> -Section 50<br> -Paragraph 1I<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=123466505&amp;loc=SL123495371-112611<br><br>Reference 13: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 20<br> -Section 50<br> -Paragraph 1B<br> -Subparagraph (i)<br> -URI http://asc.fasb.org/extlink&amp;oid=123466505&amp;loc=SL123495323-112611<br></p></div>
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<span style="display: none;">v3.22.0.1</span><table class="report" border="0" cellspacing="2" id="idm140163162517736">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Preferred Stock<br></strong></div></th>
<th class="th" colspan="1">9 Months Ended</th>
</tr>
<tr><th class="th"><div>Jan. 31, 2022</div></th></tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_EquityAbstract', window );"><strong>Equity [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
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<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PreferredStockTextBlock', window );">Preferred Stock</a></td>
<td class="text"><p id="xdx_80E_eus-gaap--PreferredStockTextBlock_zQ2qEZB56wd4" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(10)
<span id="xdx_822_z6ctCEBR8aT5">Preferred Stock</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>&#160;</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<span></span>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The entire disclosure for terms, amounts, nature of changes, rights and privileges, dividends, and other matters related to preferred stock.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -URI http://asc.fasb.org/topic&amp;trid=2208762<br></p></div>
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<span style="display: none;">v3.22.0.1</span><table class="report" border="0" cellspacing="2" id="idm140163162830120">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Common Stock<br></strong></div></th>
<th class="th" colspan="1">9 Months Ended</th>
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<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_EquityAbstract', window );"><strong>Equity [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
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<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockholdersEquityNoteDisclosureTextBlock', window );">Common Stock</a></td>
<td class="text"><p id="xdx_80F_eus-gaap--StockholdersEquityNoteDisclosureTextBlock_zVNhMxmWvUue" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(11)
<span id="xdx_82C_zAV1WBwr0pLa">Common Stock</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>&#160;</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
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had been issued and are outstanding.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section 50<br> -Paragraph 13<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=123467817&amp;loc=SL123496158-112644<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section 50<br> -Paragraph 13<br> -URI http://asc.fasb.org/extlink&amp;oid=123467817&amp;loc=SL123496158-112644<br><br>Reference 3: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section 50<br> -Paragraph 14<br> -Subparagraph (c)<br> -URI http://asc.fasb.org/extlink&amp;oid=123467817&amp;loc=SL123496171-112644<br><br>Reference 4: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section 50<br> -Paragraph 14<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=123467817&amp;loc=SL123496171-112644<br><br>Reference 5: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.3-04)<br> -URI http://asc.fasb.org/extlink&amp;oid=120397183&amp;loc=d3e187085-122770<br><br>Reference 6: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section 50<br> -Paragraph 18<br> -Subparagraph (d)<br> -URI http://asc.fasb.org/extlink&amp;oid=123467817&amp;loc=SL123496189-112644<br><br>Reference 7: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section 50<br> -Paragraph 13<br> -Subparagraph (g)<br> -URI http://asc.fasb.org/extlink&amp;oid=123467817&amp;loc=SL123496158-112644<br><br>Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -URI http://asc.fasb.org/topic&amp;trid=2208762<br><br>Reference 9: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section 50<br> -Paragraph 18<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123467817&amp;loc=SL123496189-112644<br><br>Reference 10: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section 50<br> -Paragraph 13<br> -Subparagraph (h)<br> -URI http://asc.fasb.org/extlink&amp;oid=123467817&amp;loc=SL123496158-112644<br><br>Reference 11: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section 50<br> -Paragraph 14<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123467817&amp;loc=SL123496171-112644<br><br>Reference 12: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section 50<br> -Paragraph 18<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=123467817&amp;loc=SL123496189-112644<br><br>Reference 13: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section 50<br> -Paragraph 16<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=123467817&amp;loc=SL123496180-112644<br><br>Reference 14: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section 50<br> -Paragraph 13<br> -Subparagraph (i)<br> -URI http://asc.fasb.org/extlink&amp;oid=123467817&amp;loc=SL123496158-112644<br><br>Reference 15: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 235<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.4-08(e)(1))<br> -URI http://asc.fasb.org/extlink&amp;oid=120395691&amp;loc=d3e23780-122690<br></p></div>
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<span style="display: none;">v3.22.0.1</span><table class="report" border="0" cellspacing="2" id="idm140163162507928">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Treasury Shares<br></strong></div></th>
<th class="th" colspan="1">9 Months Ended</th>
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<td class="text">&#160;<span></span>
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<span id="xdx_82B_zQQs684KTUc4">Treasury Shares</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">During
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The entire disclosure for treasury stock, including, but not limited to, average cost per share, description of share repurchase program, shares repurchased, shares held for each class of treasury stock.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 30<br> -URI http://asc.fasb.org/subtopic&amp;trid=2208821<br></p></div>
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<span style="display: none;">v3.22.0.1</span><table class="report" border="0" cellspacing="2" id="idm140163162441992">
<tr>
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<td class="text">&#160;<span></span>
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<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock', window );">Share-Based Compensation</a></td>
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<span id="xdx_828_zJK2Avg8SfW2">Share-Based Compensation</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>&#160;</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">In
2015, upon approval by the Company&#8217;s shareholders, the Company&#8217;s 2015 Omnibus Incentive Plan (the &#8220;2015 Plan&#8221;)
became effective. A total of <span id="xdx_90C_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_c20151231__us-gaap--PlanNameAxis__custom--TwoThousandAndFifteenOmnibusIncentivePlanMember_pdd" title="Share-based compensation arrangement shares authorized">1,332,036</span> shares were authorized for issuance under the 2015 Omnibus Incentive Plan, including shares available
for awards under the 2006 Stock Incentive Plan remaining at the time that plan terminated, or that were subject to awards under the 2006
Stock Incentive Plan that thereafter terminated by reason of expiration, forfeiture, cancellation or otherwise. If any award under the
2006 Stock Incentive Plan or 2015 Plan expires, is cancelled, terminates unexercised or is forfeited, those shares become again available
for grant under the 2015 Plan. The 2015 Plan will terminate ten years after its effective date, in October 2025, but is subject to earlier
termination as provided in the 2015 Plan. As of January 31, 2022, the Company has <span id="xdx_908_eus-gaap--CommonStockCapitalSharesReservedForFutureIssuance_c20220131__us-gaap--PlanNameAxis__custom--TwoThousandAndFifteenOmnibusIncentivePlanMember_pdd" title="Capital shares reserved for future issuance">696,627</span> shares available for future issuance under
the 2015 Plan which reflects adjustments made for the departure of our former CEO as well as other departures.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">On
January 18, 2018, the Company&#8217;s Board of Directors adopted the Company&#8217;s Employment Inducement Incentive Award Plan (the
&#8220;2018 Inducement Plan&#8221;) pursuant to which the Company reserved <span id="xdx_902_eus-gaap--CommonStockCapitalSharesReservedForFutureIssuance_c20180118__us-gaap--PlanNameAxis__custom--TwoThousandAndEighteenInducementPlanMember_pdd" title="Capital shares reserved for future issuance">25,000</span> shares of common stock for issuance under the Inducement
Plan. In accordance with Rule 711(a) of the NYSE American Company Guide, awards under the Inducement Plan may only be made to individuals
not previously employed by the Company (or following such individuals&#8217; bona fide period of non-employment with the Company), as
an inducement material to the individuals&#8217; entry into employment with the Company. An award is any right to receive the Company&#8217;s
common stock pursuant to the 2018 Inducement Plan, consisting of a performance share award, restricted stock award, a restricted stock
unit award or a stock payment award. As of January 31, 2022, there were <span id="xdx_90F_eus-gaap--CommonStockCapitalSharesReservedForFutureIssuance_c20220131__us-gaap--PlanNameAxis__custom--TwoThousandAndEighteenInducementPlanMember_pdd" title="Capital shares reserved for future issuance">11,487</span> shares available for grant under the 2018 Inducement Plan.
On February 9, 2022 the 2018 Inducement Plan was amended to increase the authorized shares by <span id="xdx_901_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_iI_pid_c20220208__us-gaap--PlanNameAxis__custom--TwoThousandAndEighteenInducementPlanMember_zTufnVQDbdfb" title="Share-based compensation arrangement shares authorized">250,000</span> to <span id="xdx_904_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_iI_pid_c20220209__us-gaap--PlanNameAxis__custom--TwoThousandAndEighteenInducementPlanMember_zaFhKeiXz2Sf" title="Share-based compensation arrangement shares authorized">275,000</span>.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"/>



<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Stock
Options</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company estimates the fair value of each stock option award granted with service-based vesting requirements, using the Black-Scholes
option pricing model, assuming no dividends, and using the weighted average valuation assumptions noted in the following table. The risk-free
rate is based on the US Treasury yield curve in effect at the time of grant. The expected life (estimated period of time outstanding)
of the stock options granted is estimated using the &#8220;simplified&#8221; method as permitted by the SEC&#8217;s Staff Accounting
Bulletin No. 110, <i>Share-Based Payment.</i> Expected volatility is based on the Company&#8217;s historical volatility over the expected
life of the stock option granted. The Company granted options to acquire <span id="xdx_909_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_pid_c20211101__20220131__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zAZgXjAhasJ1">793,850
</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">and <span id="xdx_901_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_pid_c20200501__20210131__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zqqZtjTtbJk9">248,876
</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">shares of stock options during
the three and nine months ended January 31, 2022 and 2021, respectively. The following assumptions were used to value the awards:</span></p>

<p id="xdx_890_eus-gaap--ScheduleOfAssumptionsUsedTableTextBlock_z8EiUHTn0w23" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;<span id="xdx_8B3_zWaD8s0syXn3" style="display: none">Schedule
of Valuation Assumptions</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="6" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Nine
    months ended January 31,</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">2022</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">2021</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 64%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Risk-free
    interest rate</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_90B_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_pid_dp_uPure_c20210501__20220131__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zqQydPnN40E3" title="Risk-free interest rate">1.5</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">%</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_904_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_pid_dp_uPure_c20200501__20210131__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zrCiQQnB8bR3" title="Risk-free interest rate">6.0</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">%</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Expected
    dividend yield</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td id="xdx_983_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_pid_dp_uPure_c20210501__20220131__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zWTySAUWOzV7" style="font: 10pt Times New Roman, Times, Serif; text-align: right" title="Expected dividend yield"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span style="-sec-ix-hidden: xdx2ixbrl1367">&#8212;</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">%</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td id="xdx_980_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_pid_dp_uPure_c20200501__20210131__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zel3u5Dy7gy7" style="font: 10pt Times New Roman, Times, Serif; text-align: right" title="Expected dividend yield"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span style="-sec-ix-hidden: xdx2ixbrl1369">&#8212;</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">%</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Expected
    life (in years)</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span id="xdx_90E_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_dtY_c20210501__20220131__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zdJIGWaFClLg" style="font-family: Times New Roman, Times, Serif; font-size: 10pt" title="Expected life (in years)">5.6</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span id="xdx_90F_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_dtY_c20200501__20210131__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_z0xdwpHQxkv" style="font-family: Times New Roman, Times, Serif; font-size: 10pt" title="Expected life (in years)">5.9</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Expected
    volatility</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_90E_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_pid_dp_uPure_c20210501__20220131__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_z6HtrJ1CpUp2" title="Expected volatility">121.9</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">%</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_906_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_pid_dp_uPure_c20200501__20210131__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zL99UmdIUMP1" title="Expected volatility">136.5</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">%</span></td></tr>
  </table>

<p id="xdx_8AE_zpvZwbbiFL1f" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p id="xdx_899_eus-gaap--ScheduleOfShareBasedCompensationActivityTableTextBlock_zNdOtyMulPaf" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">A
summary of stock options under our stock incentive plans is detailed in the following table.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;<span id="xdx_8B3_zIs0aCObVAve" style="display: none">Schedule of Stock Option Activity</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Shares
                                            </b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Underlying
         </b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Options
         </b></span></p></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Weighted</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Average</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Exercise</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Price</b></span></p></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Weighted</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Average</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Remaining</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Contractual</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Term</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(In
                                            Years)</b></span></p></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 45%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Outstanding
    as of April 30, 2021</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 2%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td id="xdx_983_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_iS_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--StockIncentivePlanMember_zsgUbprFPaO2" style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right" title="Shares Underlying Options Outstanding, Beginning"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">516,827</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td id="xdx_982_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_iS_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--StockIncentivePlanMember_zxx2fXTAKgp3" style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right" title="Weighted Average Exercise Price, Beginning Balance"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">3.89</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_904_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_dtY_c20210501__20220131__us-gaap--AwardTypeAxis__custom--StockIncentivePlanMember_zalNpmAWqtF6" title="Weighted Average Remaining Contractual Term (In Years), Beginning">9.0</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Granted</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td id="xdx_980_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--StockIncentivePlanMember_zpk2SKgMqdof" style="font: 10pt Times New Roman, Times, Serif; text-align: right" title="Shares Underlying Options Outstanding, Granted"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">793,850</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
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  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
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  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
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    <td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
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    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td id="xdx_987_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_iE_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--StockIncentivePlanMember_znfZs9B7YiEe" style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Shares Underlying Options Outstanding, Ending"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">1,143,156</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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    <td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_905_ecustom--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm_dtY_c20210501__20220131__us-gaap--AwardTypeAxis__custom--StockIncentivePlanMember_z386QtOBAAAk" title="Weighted Average Remaining Contractual Term (In Years), Ending">9.4</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Exercisable
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    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td id="xdx_988_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_iI_pid_c20220131__us-gaap--AwardTypeAxis__custom--StockIncentivePlanMember_z9Ya0TtZtO6i" style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Shares Underlying Options Outstanding, Exercisable at Ending"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">308,481</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td id="xdx_989_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_iI_pid_c20220131__us-gaap--AwardTypeAxis__custom--StockIncentivePlanMember_zade9x7Yfja" style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: right" title="Weighted Average Exercise Price, Exercisable at Ending"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">4.59</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_907_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_dtY_c20210501__20220131__us-gaap--AwardTypeAxis__custom--StockIncentivePlanMember_zCvtrEkhkB66" title="Weighted Average Remaining Contractual Term (In Years), Exercisable at Ending">8.1</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  </table>

<p id="xdx_8A0_zdAmDOFbz0ph" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">As
of January 31, 2022, the total intrinsic value of outstanding and exercisable options was approximately $<span id="xdx_900_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_iI_pp0p0_c20220131__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_z4rzomtctzBd" title="Intrinsic value of outstanding and exercisable options">11,560</span>. As of January 31, 2022,
approximately <span id="xdx_907_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares_iI_pid_c20220131__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_z1VT3kRgCgZg" title="Options unvested">835,000</span> additional options were unvested, which had an intrinsic value of <span id="xdx_904_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_iI_pp0p0_do_c20220131__us-gaap--AwardTypeAxis__custom--EmployeeStockOptionOneMember_zPDtyXZ4Benl" title="Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value">zero</span> and a weighted average remaining contractual
term of <span id="xdx_909_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1_dtY_c20210501__20220131__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zxPHN8j3Ykqb" title="Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term">9.9</span> years. There was approximately $<span id="xdx_900_eus-gaap--AllocatedShareBasedCompensationExpense_pp0p0_c20210501__20220131__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zcr1ZBL2qg98" title="Share-based payment arrangement, expense">183,000</span> and $<span id="xdx_903_eus-gaap--AllocatedShareBasedCompensationExpense_pp0p0_c20200501__20210131__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_ztO1SMZ7NYZ3" title="Share-based payment arrangement, expense">296,000</span> of total recognized compensation cost related to stock options during
each of the nine months ended January 31, 2022 and 2021, respectively. As of January 31, 2022, there was approximately $<span id="xdx_900_eus-gaap--EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions_iI_pp0p0_c20220131__us-gaap--AwardTypeAxis__custom--NonVestedStockMember_zEXvKiBjJk5" title="Unrecognized compensation cost related to non-vested stock">102,000</span> of total
unrecognized compensation cost related to non-vested stock options granted under the plans. This cost is expected to be recognized over
a weighted-average period of <span id="xdx_900_eus-gaap--EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_dtY_c20210501__20220131__us-gaap--AwardTypeAxis__custom--NonVestedStockMember_zMQJfGt4PHm3" title="Share-based compensation of weighted-average period">1.0</span> year.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company&#8217;s acquisition of 3Dent (See Note 18) was valued at the fair value of the stock on the acquisition date of $<span id="xdx_90D_ecustom--FairValueOfBasePurchasePrice_iI_pp0p0_c20210201__us-gaap--BusinessAcquisitionAxis__custom--ThreeDentAcquisitionMember_zAcoJdLPEEF2">1,451,584
</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(<span id="xdx_902_eus-gaap--StockIssuedDuringPeriodSharesNewIssues_pid_c20210130__20210201__us-gaap--BusinessAcquisitionAxis__custom--ThreeDentAcquisitionMember_zQBRKKv72pUg">361,991
</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">shares at $<span id="xdx_907_eus-gaap--BusinessAcquisitionSharePrice_iI_pid_c20210201__us-gaap--BusinessAcquisitionAxis__custom--ThreeDentAcquisitionMember_zGyxaEbaEwfj">4.01</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">).
Since the share restrictions were set to expire on February 1, 2022, within one year of the closing of the acquisition,
and lacked marketability, the Company applied a 20% discount to the purchase price making the adjusted fair value $<span id="xdx_90F_ecustom--AdjustedFairValue_iI_pp0p0_c20210201__us-gaap--BusinessAcquisitionAxis__custom--ThreeDentAcquisitionMember_z6IWXjXgR8Za" title="Fair Value of Purchase">1,161,267</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">.
Additionally, as the sellers must be employed for 12 months from the date of acquisition to retain all of their shares, the difference
between the calculated fair value and the net assets acquired represents the value of the compensation expense to be recognized over
the period of the agreed upon employment.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"/>



<p id="xdx_89E_ecustom--ScheduleOfBusinessAcquisitionAndFairValueOfNetAssetsCompensationExpenseRecognized_zu1LsraQHi47" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;<span id="xdx_8B7_zVIRlnvi8VIa" style="display: none">Schedule of Business Acquisition and Fair Value of Net Assets, Compensation Expense Recognized</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 80%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Fair
    Value of Purchase</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td id="xdx_985_ecustom--AdjustedFairValue_iI_pp0p0_c20210201__us-gaap--BusinessAcquisitionAxis__custom--ThreeDentAcquisitionMember_z1HaqeEVrnDl" style="font: 10pt Times New Roman, Times, Serif; width: 16%; text-align: right" title="Fair Value of Purchase"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">1,161,267</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Total
    Acquired Assets</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td id="xdx_988_eus-gaap--BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_iNI_pp0p0_di_c20210201__us-gaap--BusinessAcquisitionAxis__custom--ThreeDentAcquisitionMember_zwtrNIbtnlr" style="font: 10pt Times New Roman, Times, Serif; text-align: right" title="Total Acquired Assets"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(593,571</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">)</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Total
    Acquired Liabilities</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td id="xdx_980_eus-gaap--BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_c20210201__us-gaap--BusinessAcquisitionAxis__custom--ThreeDentAcquisitionMember_pp0p0" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Total Acquired Liabilities"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">117,106</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Compensation
    Expense</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td id="xdx_987_ecustom--BusinessComibinationCompensationExpensesRecognized_c20210201__us-gaap--BusinessAcquisitionAxis__custom--ThreeDentAcquisitionMember_pp0p0" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Compensation Expense"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">684,802</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Quarterly
    Compensation Expense</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td id="xdx_98F_ecustom--BusinessComibinationQuarterlyCompensationExpensesRecognized_c20210201__us-gaap--BusinessAcquisitionAxis__custom--ThreeDentAcquisitionMember_pp0p0" style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Quarterly Compensation Expense"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">171,201</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  </table>

<p id="xdx_8AD_zQNuBmqABTW6" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company has recognized approximately $<span id="xdx_90D_ecustom--BusinessComibinationQuarterlyCompensationExpensesConsiderationPaid_iI_pp0p0_c20210201__us-gaap--BusinessAcquisitionAxis__custom--ThreeDentAcquisitionMember_zjRKvmVxsrB8">171,000
</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">of compensation expense on a quarterly basis
for the consideration paid for 12 months from the acquisition date of February 2, 2021. The last of this compensation expense was
recognized during the quarter ended January 31, 2022.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Performance
Stock Options</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">In
January 2020, the Company issued <span id="xdx_907_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_pid_c20200101__20200131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember__srt--TitleOfIndividualAxis__custom--TwoExecutivesMember_zXsNMBhtuj13" title="Share-based compensation options, grants in period, gross">81,337</span> performance-based stock options to two of its executives. There were <span id="xdx_903_ecustom--ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesVestedAndOutstanding_pid_c20200101__20200131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zo36TUwD8eAb" title="Shares vested and outstanding">40,668</span> shares that were
vested and outstanding, which were set to expire on <span id="xdx_902_eus-gaap--DebtInstrumentMaturityDate_dd_c20200101__20200131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zWrbzjEny6qb" title="Debt expire date">December 15, 2021</span>, all of which were exercised prior to the expiration date.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">In
January 2021, the Company issued <span id="xdx_906_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_c20210101__20210131__srt--TitleOfIndividualAxis__custom--EmployeesAndExecutivesMember__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_z0Qxs80nHFF8" title="Share-based compensation options, grants in period, gross">344,723</span> performance-based stock options to employees and executives. <span id="xdx_907_ecustom--StockOptionsVestingPeriodDescription_c20210101__20210131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember__srt--TitleOfIndividualAxis__custom--EmployeesAndExecutivesMember_zeMSnzrmH4ni" title="Stock options vesting period description">The awards vest over 2 years provided
there is positive total shareholder return (e.g. share price increase) as measured by the closing share price on January 14, 2022 and
January 14, 2023.</span> There were <span id="xdx_909_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember__srt--TitleOfIndividualAxis__custom--EmployeesAndExecutivesMember_zRBCSkzPuKhc" title="Share-based compensation options, grants in period, gross">230,000</span> shares unvested and outstanding at January 31, 2022. None of the shares granted to our former President
and CEO under this issuance vested prior to June 18, 2021, his last day of employment. These unvested shares are included in the Cancelled/forfeited
figure in the table below. A summary of performance stock options under our stock incentive plans is detailed in the following table.</span></p>

<p id="xdx_89C_eus-gaap--ScheduleOfShareBasedCompensationActivityTableTextBlock_hus-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zsBGn3sj6mZ3" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_8BB_zwlWRkSpuRQa" style="display: none">Schedule of Stock Option Activity</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Shares
                                            </b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Underlying
         </b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Options
         </b></span></p></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Weighted</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Average</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Exercise</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Price</b></span></p></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Weighted</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Average</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Remaining</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Contractual</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Term</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(In
                                            Years)</b></span></p></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 45%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Outstanding
    as of April 30, 2021</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 2%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td id="xdx_98F_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_iS_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zpZOduwCR1K5" style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right" title="Shares Underlying Options Outstanding, Beginning"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">424,790</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td id="xdx_98E_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_iS_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zWm9CAIx8hYh" style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right" title="Weighted Average Exercise Price, Beginning Balance"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">2.57</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_907_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_dtY_c20210501__20220131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zR57w3q9OVj" title="Weighted Average Remaining Contractual Term (In Years), Beginning">9.5</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Granted</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td id="xdx_981_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zbLr6999tpSj" style="font: 10pt Times New Roman, Times, Serif; text-align: right" title="Shares Underlying Options Outstanding, Granted"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">66,667</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td id="xdx_98A_eus-gaap--ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zAYnFuENvlW9" style="font: 10pt Times New Roman, Times, Serif; text-align: right" title="Weighted Average Exercise Price, Granted"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">0.62</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Exercised</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td id="xdx_981_eus-gaap--StockIssuedDuringPeriodSharesStockOptionsExercised_iN_pid_di_c20210501__20220131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zKN4XIWDSAMg" style="font: 10pt Times New Roman, Times, Serif; text-align: right" title="Shares Underlying Options Outstanding, Exercised"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(40,668</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">)</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td id="xdx_98F_eus-gaap--ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zO5LvWqHy7bd" style="font: 10pt Times New Roman, Times, Serif; text-align: right" title="Weighted Average Exercise Price, Exercised"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">1.05</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Cancelled/forfeited</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td id="xdx_981_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod_iN_pid_di_c20210501__20220131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zzC8R4uvYmF" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Shares Underlying Options Outstanding, Cancelled/forfeited"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(220,766</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">)</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td id="xdx_981_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zKLpt4Sljkl1" style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt; text-align: right" title="Weighted Average Exercise Price, Cancelled/forfeited"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">2.58</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Outstanding
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    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td id="xdx_98C_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_iE_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_z0YVn8VoTCR2" style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Shares Underlying Options Outstanding, Ending"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">230,023</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td id="xdx_98F_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_iE_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zmjJERO74tbh" style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: right" title="Weighted Average Exercise Price, Ending Balance"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">2.26</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_908_ecustom--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm_dtY_c20210501__20220131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zgrPuzbbED14" title="Weighted Average Remaining Contractual Term (In Years), Ending">9.1</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Exercisable
    as of January 31, 2022</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td id="xdx_981_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_iI_pid_c20220131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zRwUilKWg8f6" style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Shares Underlying Options Outstanding, Exercisable at Ending"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span style="-sec-ix-hidden: xdx2ixbrl1487">&#8212;</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_904_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_dtY_c20210501__20220131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zYkatqvHiQX3" title="Weighted Average Remaining Contractual Term (In Years), Exercisable at Ending">0.0</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  </table>

<p id="xdx_8A2_zfrN1x4xjgbk" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">As
of January 31, 2022, the total intrinsic value of both outstanding and exercisable options was approximately <span id="xdx_90C_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_iI_dc_c20220131__us-gaap--AwardTypeAxis__us-gaap--PerformanceSharesMember_zBEQ89GLkmud">zero</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">.
As of January 31, 2022, approximately <span id="xdx_90A_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares_iI_pid_c20220131__us-gaap--AwardTypeAxis__us-gaap--PerformanceSharesMember_zWezoRw5IWR5">230,000
</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">options were unvested, which had an intrinsic
value of <span id="xdx_90C_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_iI_dc_c20220131__us-gaap--AwardTypeAxis__us-gaap--PerformanceSharesMember_zAOZzkuHKFl9">zero
</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">and a weighted average remaining contractual
term of <span id="xdx_900_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1_dtY_c20210501__20220131__us-gaap--AwardTypeAxis__us-gaap--PerformanceSharesMember_zUFeUbgg79Jj">9.1
</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">years. There was approximately $<span id="xdx_90C_eus-gaap--AllocatedShareBasedCompensationExpense_pp0p0_c20210501__20220131__us-gaap--AwardTypeAxis__us-gaap--PerformanceSharesMember_z9L4OV1YLVwc">123,000
</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">and $<span id="xdx_90E_eus-gaap--AllocatedShareBasedCompensationExpense_pp0p0_c20200501__20210131__us-gaap--AwardTypeAxis__us-gaap--PerformanceSharesMember_zc9oB0U8TA89">43,000
</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">of total recognized compensation cost related
to stock options during each of the nine months ended January 31, 2022 and 2021, respectively. As of January 31, 2022, there was approximately
$<span id="xdx_905_eus-gaap--EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions_c20220131__us-gaap--AwardTypeAxis__us-gaap--PerformanceSharesMember_pn5n6">242,000
</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">of total unrecognized compensation cost related
to non-vested stock options granted under the plans. This cost is expected to be recognized over a weighted-average period of <span id="xdx_904_eus-gaap--EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_dtY_c20210501__20220131__us-gaap--AwardTypeAxis__us-gaap--PerformanceSharesMember_z0YGbXUIF6Ff">1.1
</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">years.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Restricted
Stock</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Compensation
expense for non-vested restricted stock is generally recorded based on its market value on the date of grant and recognized ratably over
the associated service and performance period. During the nine months ended January 31, 2022 and 2021, the Company granted <span id="xdx_904_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_zLyL07jC0jc">777,764
</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">and <span id="xdx_902_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_pid_c20200501__20210131__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_z6jh4LrEkM9k">10,000
</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">shares,</span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">
respectively, that were subject to service-based vesting requirements.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"/>



<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p id="xdx_893_eus-gaap--ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityTableTextBlock_zQuOLPwbSsAg" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">A
summary of non-vested restricted stock under our stock incentive plans is as follows:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;<span id="xdx_8B0_zvGSHaVa6s6a" style="display: none">Schedule of Non-vested Restricted Stock Activity</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Number</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"/> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>of
                                            Shares</b></span></p></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Weighted</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"/> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Average
                                            Price per</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"/> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Share</b></span></p></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 64%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Issued
    and unvested at April 30, 2021</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td id="xdx_983_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_iS_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_ze7Z2QDf8j2b" style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right" title="Number of Shares, Issued and unvested, Beginning"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">10,000</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td id="xdx_98F_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_iS_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_zoRAJ945JUeb" style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right" title="Weighted Average Price per Share, Issued and Unvested, Beginning"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">2.93</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Granted</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td id="xdx_98D_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_zRQBpF0rN3bk" style="font: 10pt Times New Roman, Times, Serif; text-align: right" title="Number of Shares, Granted"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">777,764</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td id="xdx_983_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_zGuHf0UmNwua" style="font: 10pt Times New Roman, Times, Serif; text-align: right" title="Weighted Average Price per Share, Granted"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">1.42</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Vested</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td id="xdx_98C_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_iN_pid_di_c20210501__20220131__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_zzacWTXXIQn2" style="font: 10pt Times New Roman, Times, Serif; text-align: right" title="Number of Shares, Vested"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(10,000</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">)</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td id="xdx_986_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_zQQYIdEqq0p4" style="font: 10pt Times New Roman, Times, Serif; text-align: right" title="Weighted Average Price per Share, Vested"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">2.93</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Cancelled/forfeited</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td id="xdx_981_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_zDeqjNnbT3si" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Number of Shares, Cancelled/forfeited"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span style="-sec-ix-hidden: xdx2ixbrl1515">&#8212;</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td id="xdx_980_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_zpLKFWhk7Rx9" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Weighted Average Price per Share, Cancelled/forfeited"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span style="-sec-ix-hidden: xdx2ixbrl1517">&#8212;</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Issued
    and unvested at January 31, 2022</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td id="xdx_980_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_iE_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_z6uC7agcOCD" style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Number of Shares, Issued and Unvested, Ending"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">777,764</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td id="xdx_982_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_iE_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_z3ZlSS1WJbF2" style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Weighted Average Price per Share, Issued and Unvested, Ending"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">1.42</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
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<p id="xdx_8A8_z0ybN5zc3oi4" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">There
was approximately $<span id="xdx_906_eus-gaap--AllocatedShareBasedCompensationExpense_pp0p0_c20210501__20220131__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_zBcwBrnBDoW6" title="Share-based payment arrangement, expense">43,000</span>
and $<span id="xdx_905_eus-gaap--AllocatedShareBasedCompensationExpense_pp0p0_c20200501__20210131__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_zXYEprwGorLf" title="Share-based payment arrangement, expense">12,000</span>
of total recognized compensation cost related to restricted stock for the nine months ended January 31, 2022 and 2021, respectively.
As of January 31, 2022, there is approximately $<span id="xdx_902_eus-gaap--EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_iI_pp0p0_c20220131__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_z7800wMVYQUl" title="Unrecognized compensation cost">54,000</span>
of unrecognized compensation cost remaining related to unvested restricted stock granted under our plans. This cost is expected to
be recognized over a weighted-average period of approximately <span id="xdx_903_eus-gaap--EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_dtY_c20210501__20220131__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_zeU7becczWZ6" title="Share-based compensation of weighted-average period">1.4</span>
years.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">In
December 2019, the Company granted <span id="xdx_90B_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_pid_c20210501__20220131__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember__srt--TitleOfIndividualAxis__custom--EmployeeMember__srt--StatementScenarioAxis__custom--SubjectToServiceBasedVestingRequirementsMember_zZCWVPmFWna" title="Restricted stock option granted">51,547</span> shares to an employee, subject to service-based vesting requirements, that were outside the
Company stock incentive plans. There was approximately <span id="xdx_904_eus-gaap--AllocatedShareBasedCompensationExpense_pp0p0_dc_c20210501__20220131__us-gaap--AwardTypeAxis__us-gaap--StockOptionMember__srt--TitleOfIndividualAxis__custom--EmployeeMember__srt--StatementScenarioAxis__custom--SubjectToServiceBasedVestingRequirementsMember_zQwlTKbGZKA8" title="Share-based payment arrangement, expense">zero</span> and $<span id="xdx_90D_eus-gaap--AllocatedShareBasedCompensationExpense_pp0p0_c20200501__20210131__us-gaap--AwardTypeAxis__us-gaap--StockOptionMember__srt--TitleOfIndividualAxis__custom--EmployeeMember__srt--StatementScenarioAxis__custom--SubjectToServiceBasedVestingRequirementsMember_zReJgHF5df49" title="Share-based payment arrangement, expense">30,000</span> of total recognized compensation cost related to this award for
the three months ended January 31, 2022 and 2021, respectively. As of January 31, 2022, there was <span id="xdx_904_eus-gaap--EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions_iI_pp0p0_do_c20220131__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember__srt--TitleOfIndividualAxis__custom--EmployeeMember__srt--StatementScenarioAxis__custom--SubjectToServiceBasedVestingRequirementsMember_zazTO3GsWw7f" title="Unrecognized compensation cost related to non-vested stock">no</span> unrecognized compensation cost remaining
related to this award.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<span></span>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The entire disclosure for share-based payment arrangement.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -URI http://asc.fasb.org/topic&amp;trid=2228938<br></p></div>
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<span style="display: none;">v3.22.0.1</span><table class="report" border="0" cellspacing="2" id="idm140163162843480">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Fair Value Measurements<br></strong></div></th>
<th class="th" colspan="1">9 Months Ended</th>
</tr>
<tr><th class="th"><div>Jan. 31, 2022</div></th></tr>
<tr class="re">
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<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_FairValueDisclosuresTextBlock', window );">Fair Value Measurements</a></td>
<td class="text"><p id="xdx_806_eus-gaap--FairValueDisclosuresTextBlock_zk6lv0GKpfqd" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(14)
<span id="xdx_827_zXSgzeGfvhS4">Fair Value Measurements</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>&#160;</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">ASC
Topic 820, &#8220;<i>Fair Value Measurements&#8221;</i> states that fair value is an exit price, representing the amount that would be
received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date.
Assets and liabilities that are measured at fair value are reported using a three-level fair value hierarchy that prioritizes the inputs
used to measure fair value. This hierarchy maximizes the use of observable input and minimizes the use of unobservable inputs. The following
is a description of the three hierarchy levels.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
  <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify; width: 0.65in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Level
  1</span></td>
  <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Unadjusted
  quoted prices in active markets for identical assets or liabilities that the Company has the ability to access at the measurement date.</span></td></tr>

<tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
  <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
  <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
<tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
  <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Level
  2</span></td>
  <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Inputs
  other than quoted prices in active markets that are observable for the asset or liability, either directly or indirectly.</span></td></tr>

<tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
  <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
  <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
<tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
  <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Level
  3</span></td>
  <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Inputs
  that are unobservable for the asset or liability.</span></td></tr>
</table>


<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 45pt; text-align: justify; text-indent: -45pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Disclosure
of Fair Values</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company&#8217;s financial instruments that are not re-measured at fair value include cash, cash equivalents, restricted cash, accounts
receivable, contract assets and liabilities, deposits, accounts payable, and accrued expenses. The carrying values of these financial
instruments approximate their fair values and are viewed as Level 1 items. The Company&#8217;s warrant liabilities represent the only
asset or liability classified financial instrument that is measured at fair value on a recurring basis.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
fair value of the Company&#8217;s warrant liabilities (refer to Note 8) is based on the Black-Scholes pricing model which is based on
Level 3 unobservable inputs for which there is little or no market data, requiring the Company to develop its own assumptions. The assumptions
used by the Company are the quoted price of the Company&#8217;s common stock in an active market, risk-free interest rate, volatility
and expected life, and assumes no dividends. Volatility is based on the actual market activity of the Company&#8217;s stock. The expected
life is based on the remaining contractual term of the warrants and the risk-free interest rate is based on the implied yield available
on U.S. Treasury Securities with a maturity equivalent to the warrants&#8217; expected life. The fair value on a recurring basis as of
January 31, 2022 and April 30, 2021 was near <span id="xdx_90F_eus-gaap--FairValueNetAssetLiability_iI_dc_c20220131_zPSAHAmKwz5e" title="Fair value on a recurring basis"><span id="xdx_90D_eus-gaap--FairValueNetAssetLiability_iI_dc_c20210430_zA9MSc24JGje">zero</span></span>.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"/>



<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">There
were no unrealized gains or losses for the three and nine months ended January 31, 2022 or 2021. When incurred, gains and losses are
included within &#8220;Gain (loss) due to change in fair value of warrant liabilities&#8221; in the Consolidated Statements of Operations.
The Company determined the fair value using the Black-Scholes pricing model with the following assumptions:</span></p>

<p id="xdx_89F_ecustom--ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionTableTextBlock_zNrIMIELlQZd" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;<span id="xdx_8BE_zDeU3UdWaWYd" style="display: none">Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">January
    31, 2022</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">January
    31, 2021</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
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                                            - <span id="xdx_900_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_pid_dp_c20200501__20210131__srt--RangeAxis__srt--MaximumMember_zHWeCICoZjw8" title="Risk-free interest rate">0.08</span>%</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
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                                            - <span id="xdx_90D_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_dtY_c20200501__20210131__srt--RangeAxis__srt--MaximumMember_zgypZz5666vi" title="Expected life (in years)">0.8</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
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<p id="xdx_8AD_zV3eA4hLrsHa" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Transfers
into or out of any hierarchy level are recognized at the end of the reporting period in which the transfers occurred. There were no transfers
between any hierarchy levels during each of the three and nine months ended January 31, 2022 or 2021.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 820<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=123874694&amp;loc=d3e19207-110258<br></p></div>
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<span style="display: none;">v3.22.0.1</span><table class="report" border="0" cellspacing="2" id="idm140163162483448">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Commitments and Contingencies<br></strong></div></th>
<th class="th" colspan="1">9 Months Ended</th>
</tr>
<tr><th class="th"><div>Jan. 31, 2022</div></th></tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CommitmentsAndContingenciesDisclosureAbstract', window );"><strong>Commitments and Contingencies Disclosure [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
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<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CommitmentsAndContingenciesDisclosureTextBlock', window );">Commitments and Contingencies</a></td>
<td class="text"><p id="xdx_80A_eus-gaap--CommitmentsAndContingenciesDisclosureTextBlock_zkDBzammzTh5" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(15)
<span id="xdx_826_zvaYjfUo89kb">Commitments and Contingencies</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>&#160;</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Employment
Litigation </i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>&#160;</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">On
August 28, 2018, counsel for Charles Dunleavy, the Company&#8217;s former President &amp; Chief Executive Officer who was terminated
for cause effective June 9, 2014, filed a demand for arbitration, captioned Charles F. Dunleavy v. Ocean Power Technologies, Inc., Case
No. 01-18-0003-2374, before the American Arbitration Association in New Jersey. The demand alleged various claims relating to Mr. Dunleavy&#8217;s
termination. After the hearings in the proceeding were conducted, on December 11, 2020, the arbitration panel issued an interim award
finding, among other things, that the termination for cause of Mr. Dunleavy was in breach of his employment contract and awarded him
compensatory damages in the amount of $<span id="xdx_90F_eus-gaap--LossContingencyDamagesSoughtValue_pp2p0_c20180827__20180828__us-gaap--RelatedPartyTransactionsByRelatedPartyAxis__custom--CharlesFDunleavyMember_zj01hPvLMX59" title="Loss contingency, damages sought, value">438,254.54</span>. On May 3, 2021, the panel issued a second interim award and therein awarded Mr. Dunleavy
attorneys&#8217; fees, costs and pre-judgment interest. The Company agreed, on May 24, 2021, to pay Mr. Dunleavy $<span id="xdx_90D_eus-gaap--LossContingencyDamagesSoughtValue_pp2p0_c20210523__20210524__us-gaap--RelatedPartyTransactionsByRelatedPartyAxis__custom--CharlesFDunleavyMember_zvXV4dNfGOtk" title="Loss contingency, damages sought, value">1,223,963.14</span>, representing
the total compensatory damages, attorneys&#8217; fees, costs and pre-judgment interest, which is the full amount awarded by the arbitration
panel. The Company made the required payment on May 26, 2021, and the matter is now closed.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Spain
Income Tax Audit</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>&#160;</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company underwent an income tax audit in Spain for the period from 2011 to 2014, when our Spanish branch was closed. On July 30, 2018,
the Spanish tax inspector concluded that although there was no tax owed in light of losses reported, the Company&#8217;s Spanish branch
owed penalties for failure to properly account for the income associated with the funding grant. During the nine months ended January
31, 2021, the Company received notice from the Spanish Central Economic and Administrative Tribunal that it agreed with the inspector
and ruled that the Company owes the full amount of the penalty in the amount of &#8364;<span id="xdx_901_eus-gaap--IncomeTaxExaminationPenaltiesAndInterestAccrued_iI_pp0p0_uEuro_c20210131__us-gaap--IncomeStatementLocationAxis__us-gaap--SellingGeneralAndAdministrativeExpensesMember__us-gaap--IncomeTaxAuthorityNameAxis__us-gaap--TaxAuthoritySpainMember_zCI5gOd7amHc" title="Income tax penalties">279,870</span> or approximately $<span id="xdx_908_eus-gaap--IncomeTaxExaminationPenaltiesAndInterestAccrued_iI_pp0p0_c20210131__us-gaap--IncomeStatementLocationAxis__us-gaap--SellingGeneralAndAdministrativeExpensesMember__us-gaap--IncomeTaxAuthorityNameAxis__us-gaap--TaxAuthoritySpainMember_zmf1ZljMw74f" title="Income tax penalties">331,000</span>. On January 25,
2021, the Company paid the Spanish Tax Administration &#8364;<span id="xdx_906_eus-gaap--IncomeTaxExaminationPenaltiesAndInterestAccrued_iI_pp0p0_uEuro_c20210125__us-gaap--IncomeStatementLocationAxis__us-gaap--SellingGeneralAndAdministrativeExpensesMember__us-gaap--IncomeTaxAuthorityNameAxis__us-gaap--TaxAuthoritySpainMember_zq8RRGcAdLsj" title="Income tax penalties">279,870</span>. Notwithstanding that payment, on April 30, 2021, the Company filed
its appeal of the decision of the Central Court to the Spanish National Court. There is no schedule for a ruling from the Spanish National
Court.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<span></span>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The entire disclosure for commitments and contingencies.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 450<br> -URI http://asc.fasb.org/topic&amp;trid=2127136<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 440<br> -URI http://asc.fasb.org/topic&amp;trid=2144648<br><br>Reference 3: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 954<br> -SubTopic 440<br> -Section 50<br> -Paragraph 1<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=6491277&amp;loc=d3e6429-115629<br><br>Reference 4: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 440<br> -SubTopic 10<br> -Section 50<br> -Paragraph 4<br> -Subparagraph (c)<br> -URI http://asc.fasb.org/extlink&amp;oid=123406679&amp;loc=d3e25336-109308<br><br>Reference 5: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 440<br> -SubTopic 10<br> -Section 50<br> -Paragraph 4<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123406679&amp;loc=d3e25336-109308<br></p></div>
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<span style="display: none;">v3.22.0.1</span><table class="report" border="0" cellspacing="2" id="idm140163162376456">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Income Taxes<br></strong></div></th>
<th class="th" colspan="1">9 Months Ended</th>
</tr>
<tr><th class="th"><div>Jan. 31, 2022</div></th></tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_IncomeTaxDisclosureAbstract', window );"><strong>Income Tax Disclosure [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_IncomeTaxDisclosureTextBlock', window );">Income Taxes</a></td>
<td class="text"><p id="xdx_80E_eus-gaap--IncomeTaxDisclosureTextBlock_zelmQyUhowv1" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(16)
<span id="xdx_82C_z1TOwrFCjXG2">Income Taxes</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>&#160;</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Uncertain
Tax Positions</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company applies the guidance issued by the FASB for the accounting and reporting of uncertain tax positions. The guidance requires the
Company to recognize in its consolidated financial statements the impact of a tax position if that position is more likely than not to
be sustained upon examination, based on the technical merits of the position. At January 31, 2022, the Company had no unrecognized tax
positions. The Company does not expect any material increase or decrease in its income tax expense in the next twelve months, related
to examinations or uncertain tax positions. U.S. federal and state income tax returns were audited through fiscal 2014 and fiscal 2010
respectively. Net operating loss and credit carry forwards since inception remain open to examination by taxing authorities and will
continue to remain open for a period of time after utilization.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"/>



<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Income
Tax Benefit</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company sold New Jersey State net operating losses and research development credits under the NJEDA Tax Transfer program in the amount
of approximately $<span id="xdx_902_eus-gaap--OperatingIncomeLoss_pn5n6_c20200501__20210430_z0sBB1UGo5Kc">12.0
</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">million for the year ended April 30, 2021, for
net proceeds of approximately $<span id="xdx_907_eus-gaap--ProceedsFromDebtNetOfIssuanceCosts_pn5n6_c20200501__20210430_zqmomDTqenQf">1.0
</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">million which was received in May 2021 and recorded
in the Company&#8217;s Statement of Operations in fiscal year 2022. <span style="background-color: white">This results from a program
where New Jersey-based technology or biotechnology companies with fewer than 225 US employees may be eligible to sell net operating losses
and research and development tax credits to unaffiliated corporations, up to a maximum lifetime benefit of $<span id="xdx_906_eus-gaap--OperatingIncomeLoss_pn5n6_c20200501__20210430__srt--TitleOfIndividualAxis__custom--USEmployeesMember_zYZltBHHCqbi">20.0
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per business. As of January 31, 2022 we have approximately $<span id="xdx_90D_eus-gaap--OperatingIncomeLoss_pn5n6_c20210501__20220430_z5gPxIj8U6Yb">5.0
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available to sell should we chose to do so.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<span></span>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 740<br> -SubTopic 10<br> -Section 50<br> -Paragraph 21<br> -URI http://asc.fasb.org/extlink&amp;oid=121826272&amp;loc=d3e32857-109319<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 740<br> -SubTopic 10<br> -Section S99<br> -Paragraph 2<br> -Subparagraph (SAB Topic 11.C)<br> -URI http://asc.fasb.org/extlink&amp;oid=122134291&amp;loc=d3e330215-122817<br><br>Reference 3: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 740<br> -SubTopic 10<br> -Section 50<br> -Paragraph 17<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=121826272&amp;loc=d3e32809-109319<br><br>Reference 4: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 740<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SAB TOPIC 6.I.5.Q1)<br> -URI http://asc.fasb.org/extlink&amp;oid=122134291&amp;loc=d3e330036-122817<br><br>Reference 5: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 740<br> -SubTopic 10<br> -Section 50<br> -Paragraph 14<br> -URI http://asc.fasb.org/extlink&amp;oid=121826272&amp;loc=d3e32705-109319<br><br>Reference 6: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 740<br> -SubTopic 270<br> -Section 50<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=6424409&amp;loc=d3e44925-109338<br><br>Reference 7: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 740<br> -URI http://asc.fasb.org/topic&amp;trid=2144680<br><br>Reference 8: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 740<br> -SubTopic 30<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=6424122&amp;loc=d3e41874-109331<br><br>Reference 9: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 235<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.4-08(h)(2))<br> -URI http://asc.fasb.org/extlink&amp;oid=120395691&amp;loc=d3e23780-122690<br></p></div>
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<span style="display: none;">v3.22.0.1</span><table class="report" border="0" cellspacing="2" id="idm140163162820008">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Operating Segments and Geographic Information<br></strong></div></th>
<th class="th" colspan="1">9 Months Ended</th>
</tr>
<tr><th class="th"><div>Jan. 31, 2022</div></th></tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SegmentReportingAbstract', window );"><strong>Segment Reporting [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SegmentReportingDisclosureTextBlock', window );">Operating Segments and Geographic Information</a></td>
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<span id="xdx_822_zKmQ4i11p7Lj">Operating Segments and Geographic Information</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>&#160;</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
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wholly-owned subsidiaries, 3Dent and MAR, and subsidiaries in the UK and in Australia. Revenues and expenses are generally attributed
to the operating company that bills the customers. During each of the nine months ended January 31, 2022 and 2021, the Company&#8217;s
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.</p></div>
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<span style="display: none;">v3.22.0.1</span><table class="report" border="0" cellspacing="2" id="idm140163162847720">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Business Combination<br></strong></div></th>
<th class="th" colspan="1">9 Months Ended</th>
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<tr><th class="th"><div>Jan. 31, 2022</div></th></tr>
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<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_BusinessCombinationDisclosureTextBlock', window );">Business Combination</a></td>
<td class="text"><p id="xdx_80F_eus-gaap--BusinessCombinationDisclosureTextBlock_zJoPAycELxV3" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(18)
<span id="xdx_82B_zDJXGqRmabqe">Business Combination</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>&#160;</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>3dent
Technologies, LLC</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>&#160;</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">On
February 1, 2021, the Company acquired all of the outstanding equity interest of 3dent Technologies, LLC (&#8220;3Dent&#8221;), a Houston,
Texas based company that offers offshore energy engineering and design services that are complementary to the Company&#8217;s technology
and products. As consideration for the purchase, the Company issued <span id="xdx_905_eus-gaap--StockIssuedDuringPeriodSharesAcquisitions_pid_c20210130__20210201__us-gaap--BusinessAcquisitionAxis__custom--ThreeDentAcquisitionMember_zstBYe769FC8">361,991
</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">shares of its common stock to the sellers, subject
to a 12-month post acquisition employment condition, which has now been achieved. In addition, the former owners of 3Dent would have
been eligible for awards of performance stock with a potential value of $<span id="xdx_909_eus-gaap--StockIssuedDuringPeriodValueAcquisitions_pp0p0_c20210130__20210201__us-gaap--BusinessAcquisitionAxis__custom--ThreeDentAcquisitionMember_z87blyFe1db4">360,000
</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">if certain revenue targets are achieved over
the 12 month-period post acquisition. As of January 31, 2022, it was determined that 3Dent did not meet these
revenue targets.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"/></p>
<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"/>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"/>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"/></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Marine
Advance Robotics, Inc.</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>&#160;</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">On
November 15, 2021, the Company acquired all of the outstanding equity interest of Marine Advanced Robotics, Inc. (&#8220;MAR&#8221;),
a Richmond (San Francisco Bay Area), California-based developer and manufacturer of autonomous surface vehicles.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"/>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company accounted for the transaction as a business combination under ASC 805, <i>&#8220;Business Combinations.&#8221; </i>Accordingly,
the assets and liabilities acquired were recorded at their estimated fair value on the date of acquisition. Under ASC 805, acquisition-related
transaction costs of approximately $<span id="xdx_908_eus-gaap--BusinessCombinationAcquisitionRelatedCosts_pn5n6_c20210501__20220131_zit1szN38eHc" title="Acquisition related costs">0.3</span> million (such as advisory, legal, valuation, other professional fees) were expensed in the Consolidated
Statement of Operations in the period incurred.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company paid cash consideration of $<span id="xdx_902_eus-gaap--PaymentsToAcquireBusinessesGross_pn5n6_c20211114__20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvancedRoboticsIncMember_zRwrT74QqaMc">4.0 </span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">million
and issued <span id="xdx_906_eus-gaap--BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_pid_c20211114__20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvancedRoboticsIncMember__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_zfAhFnUNp6vi">3,330,162 </span></span> <span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">shares
of our</span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"> common stock valued at <span id="xdx_901_eus-gaap--BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned_iI_pn5n6_c20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvancedRoboticsIncMember__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_zIvtrzQPzLr7">approximately
$5.9</span></span> <span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">million based on the closing
price of $<span id="xdx_90F_eus-gaap--BusinessAcquisitionSharePrice_iI_pid_c20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvancedRoboticsIncMember__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_zvGEfnDzCOqg">2.10
and </span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">reduced by a lack of
marketability discount since they were restricted. The Company assumed liability for advances payable to the former owners
of MAR for approximately $456,000.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
contingent consideration is based on the achievement of certain milestones over a 30-month period. As of the acquisition date, the
contingent consideration had a fair value of $<span id="xdx_908_eus-gaap--BusinessCombinationContingentConsiderationAsset_iI_pn5n6_c20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvancedRoboticsIncMember_zKAEXOrVQcTb">1.6 </span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">million.
Under the terms of the MAR purchase agreement, <span id="xdx_905_eus-gaap--BusinessAcquisitionProFormaInformationDescription_c20211114__20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvancedRoboticsIncMember_z65nc7cCn45l" title="Business combination, description">the
contingent consideration consists of two earn-out periods, one running from the date of the acquisition through April 30, 2023 in
which the maximum earn-out is $1.5 million and the other from May 1, 2023 through April 30, 2024 where the maximum earn-out is $2
million. The fair value as of the date of acquisition was determined using a simulation model based on an estimate of revenues
during these periods and discount factors ranging from 5.8% to 14.5%.</span> As discussed in Note 14 per ASC Topic 820 we consider
this to be a Level 3 liability.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>
<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Total
consid</span>eration including cash, restricted shares, liabilities assumed, and contingent consideration was valued at
approximately $<span id="xdx_902_eus-gaap--BusinessCombinationConsiderationTransferred1_pn5n6_c20211114__20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvancedRoboticsIncMember_zGyyHjpqPvT9">11.9 </span>million.</p>
<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"/></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"/>



<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"/></p>

<p id="xdx_892_eus-gaap--ScheduleOfBusinessAcquisitionsByAcquisitionContingentConsiderationTextBlock_zk0exgbolm37" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Purchase
consideration consisted of the following:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;<span id="xdx_8B7_zL6lB3OeLppl" style="display: none">Schedule
of Purchase Consideration</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 80%">
  <tr style="vertical-align: bottom">
    <td style="padding-bottom: 1pt">&#160;</td><td style="padding-bottom: 1pt">&#160;</td>
    <td colspan="2" style="border-bottom: Black 1pt solid; text-align: center">(in thousands)</td><td style="padding-bottom: 1pt">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="width: 78%">Cash</td><td style="width: 2%">&#160;</td>
    <td style="width: 1%; text-align: left">$</td><td id="xdx_987_eus-gaap--PaymentsToAcquireBusinessesGross_pn3n3_c20211114__20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvancedRoboticsIncMember_zAC7R75eClFk" style="width: 18%; text-align: right" title="Cash">4,000</td><td style="width: 1%; text-align: left">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td style="text-align: left">Liabilities assumed</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td id="xdx_98A_eus-gaap--BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_c20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvancedRoboticsIncMember_pn3n3" style="text-align: right" title="Liabilities assumed">456</td><td style="text-align: left">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td>Fair value of restricted shares</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td id="xdx_986_eus-gaap--BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_pn3n3_c20211114__20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvancedRoboticsIncMember_z2X9CcrrX7qg" style="text-align: right" title="Fair value of restricted shares">5,855</td><td style="text-align: left">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td style="padding-bottom: 1pt">Fair value of contingent consideration</td><td style="padding-bottom: 1pt">&#160;</td>
    <td style="border-bottom: Black 1pt solid; text-align: left">&#160;</td><td id="xdx_98C_eus-gaap--BusinessCombinationContingentConsiderationAsset_c20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvancedRoboticsIncMember_pn3n3" style="border-bottom: Black 1pt solid; text-align: right" title="Fair value of contingent consideration">1,591</td><td style="padding-bottom: 1pt; text-align: left">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="padding-bottom: 2.5pt; text-align: left">Total consideration</td><td style="padding-bottom: 2.5pt">&#160;</td>
    <td style="border-bottom: Black 2.5pt double; text-align: left">$</td><td id="xdx_98A_eus-gaap--BusinessCombinationConsiderationTransferred1_pn3n3_c20211114__20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvancedRoboticsIncMember_zjM5zKnEr232" style="border-bottom: Black 2.5pt double; text-align: right" title="Total consideration">11,902</td><td style="padding-bottom: 2.5pt; text-align: left">&#160;</td></tr>
  </table>

<p id="xdx_8A9_z5NIg0ZrRH1d" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"/>

<p id="xdx_89F_eus-gaap--ScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedTableTextBlock_zA8Uzs4chd34" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
preliminary allocation of the fair value of the MAR acquisition is shown in the table below. The allocation of the fair value will be
finalized when the valuation is completed, and the differences will be trued up for the final allocated amounts, hence, actual results may differ from preliminary estimate.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_8BF_zbQMjUdwsWa7" style="display: none">Schedule
of Allocated Fair Value of Purchase Consideration</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 80%">
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="padding-bottom: 1pt; width: 78%; text-align: left">Total Purchase Consideration</td><td style="padding-bottom: 1pt; width: 2%">&#160;</td>
    <td style="border-bottom: Black 1pt solid; width: 1%; text-align: left">$</td><td id="xdx_98D_eus-gaap--BusinessCombinationConsiderationTransferred1_pn3n3_c20211114__20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvancedRoboticsIncMember_zX5kdPw2dvmj" style="border-bottom: Black 1pt solid; width: 18%; text-align: right" title="Total Purchase Consideration">11,902</td><td style="padding-bottom: 1pt; width: 1%; text-align: left">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td>&#160;</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td style="text-align: right">&#160;</td><td style="text-align: left">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td>Cash</td><td>&#160;</td>
    <td style="text-align: left">$</td><td id="xdx_981_eus-gaap--BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_iI_pn3n3_c20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvanceRoboticsIncMember_zNyZ5jprcmU5" style="text-align: right" title="Cash">12</td><td style="text-align: left">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td>Inventory</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td id="xdx_98A_eus-gaap--BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory_iI_pn3n3_c20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvanceRoboticsIncMember_zG2baDro8uX7" style="text-align: right" title="Inventories">150</td><td style="text-align: left">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left">Property and equipment, net</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td id="xdx_983_eus-gaap--BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_iI_pn3n3_c20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvanceRoboticsIncMember_z9dooLl4Jy0l" style="text-align: right" title="Property and equipment, net">38</td><td style="text-align: left">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td>Trademarks</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td id="xdx_98D_eus-gaap--BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_iI_pn3n3_c20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvanceRoboticsIncMember__us-gaap--IndefiniteLivedIntangibleAssetsByMajorClassAxis__us-gaap--TradeNamesMember_z6L0E06lAlKe" style="text-align: right" title="Intangible assets">2,755</td><td style="text-align: left">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td>Patents</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td id="xdx_988_eus-gaap--BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_iI_pn3n3_c20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvanceRoboticsIncMember__us-gaap--FiniteLivedIntangibleAssetsByMajorClassAxis__us-gaap--PatentsMember_zlRkOjeJ1Hye" style="text-align: right" title="Intangible assets">1,193</td><td style="text-align: left">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td style="padding-bottom: 1pt">Goodwill</td><td style="padding-bottom: 1pt">&#160;</td>
    <td style="border-bottom: Black 1pt solid; text-align: left">&#160;</td><td id="xdx_985_eus-gaap--Goodwill_iI_pn3n3_c20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvanceRoboticsIncMember_zuYmZv3w8ON5" style="border-bottom: Black 1pt solid; text-align: right" title="Goodwill">7,754</td><td style="padding-bottom: 1pt; text-align: left">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="padding-bottom: 2.5pt; text-align: left">Net assets acquired</td><td style="padding-bottom: 2.5pt">&#160;</td>
    <td style="border-bottom: Black 2.5pt double; text-align: left">$</td><td id="xdx_989_eus-gaap--BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_iI_pn3n3_c20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvanceRoboticsIncMember_zxM5Z3nCk0C2" style="border-bottom: Black 2.5pt double; text-align: right" title="Net assets acquired">11,902</td><td style="padding-bottom: 2.5pt; text-align: left">&#160;</td></tr>
  </table>

<p id="xdx_8A1_zsZjQPc9fb32" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; background-color: white"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
net assets were recorded at their estimated fair value. In valuing acquired assets and liabilities, fair value estimates were based
primarily on future expected cash flows, market rate assumptions, and appropriate discount rates. In connection with the acquisition
of MAR, we acquired approximately $<span id="xdx_909_eus-gaap--BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_iI_pn5n6_c20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvancedRoboticsIncMember_z4yYiI9qOch2" title="Business acquistion intangible assets">3.9</span>
million of intangible assets including trademarks with an indefinite life and patents that will be amortized over a useful life of
nine years. </span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; background-color: white"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; background-color: white"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Goodwill
is considered an indefinite-lived asset that relates primarily to intangible assets that do not qualify for separate recognition.
The Company is currently evaluating the tax implications on the business combination accounting and compiling the information needed
for a pro forma disclosure related to the acquisition of MAR which is expected in our year end reporting.</span></p>





<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"/></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"/>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"/></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"/></p>

<span></span>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The entire disclosure for a business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities. The disclosure may include leverage buyout transactions (as applicable).</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 805<br> -URI http://asc.fasb.org/topic&amp;trid=2303972<br></p></div>
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<span style="display: none;">v3.22.0.1</span><table class="report" border="0" cellspacing="2" id="idm140163162465864">
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<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Subsequent Events<br></strong></div></th>
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<tr><th class="th"><div>Jan. 31, 2022</div></th></tr>
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<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SubsequentEventsTextBlock', window );">Subsequent Events</a></td>
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Events</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b/></span>&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"/>

<p style="font: 10pt/120% Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="background-color: white"><i>New
Jersey Net Operating Loss Transfer Program</i></span></p>
<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>&#160;</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt; background-color: white"/></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"/></p>

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February 2022, the Company sold New Jersey State net operating losses and research and development credits in
the amount of $<span id="xdx_901_eus-gaap--OperatingLossCarryforwards_iI_pn5n6_c20220228__us-gaap--SubsequentEventTypeAxis__us-gaap--SubsequentEventMember__us-gaap--IncomeTaxAuthorityNameAxis__us-gaap--NewJerseyDivisionOfTaxationMember_zJNsorBXYVk6">4.0
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 855<br> -URI http://asc.fasb.org/topic&amp;trid=2122774<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 855<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=6842918&amp;loc=SL6314017-165662<br></p></div>
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<span style="display: none;">v3.22.0.1</span><table class="report" border="0" cellspacing="2" id="idm140163162735304">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Summary of Significant Accounting Policies (Policies)<br></strong></div></th>
<th class="th" colspan="1">9 Months Ended</th>
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<tr><th class="th"><div>Jan. 31, 2022</div></th></tr>
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<td class="text">&#160;<span></span>
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<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ConsolidationPolicyTextBlock', window );">Consolidation</a></td>
<td class="text"><p id="xdx_84C_eus-gaap--ConsolidationPolicyTextBlock_zBFiVSgwIaz9" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>(a)
<span id="xdx_865_zDBhF8X9gW9c">Consolidation</span></i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
accompanying consolidated financial statements include the accounts of the Company and its majority-owned subsidiaries. All significant
intercompany balances and transactions have been eliminated in consolidation.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<span></span>
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<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_UseOfEstimates', window );">Use of Estimates</a></td>
<td class="text"><p id="xdx_841_eus-gaap--UseOfEstimates_z7LQTREayaS5" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>(b)
<span id="xdx_86A_zL8LNwapiU0c">Use of Estimates</span></i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
preparation of the consolidated financial statements requires management of the Company to make a number of estimates and assumptions
relating to the reported amounts of assets and liabilities at the date of the consolidated financial statements and the reported amounts
of revenues and expenses during the period. Significant items subject to such estimates and assumptions include, among other items, valuations,
purchase price allocations and contingent consideration related to business combinations, expected future cash flows including growth
rates, discount rates, terminal values and other assumptions and estimates used to evaluate the recoverability of long-lived assets,
goodwill and other intangible assets and the related amortization methods and periods, estimated costs to complete projects and percentage
of completion of customer contracts for purposes of revenue recognition. Actual results could differ from those estimates.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"/>



<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<span></span>
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<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CashAndCashEquivalentsRestrictedCashAndCashEquivalentsPolicy', window );">Cash, Cash Equivalents, Restricted Cash and Security Agreements</a></td>
<td class="text"><p id="xdx_84A_eus-gaap--CashAndCashEquivalentsRestrictedCashAndCashEquivalentsPolicy_zN4kSXA5PL1d" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>(c)
<span id="xdx_865_zh6i9EThGaZ2">Cash, Cash Equivalents, Restricted Cash and Security Agreements</span></i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Cash
and Cash Equivalents</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company considers all highly liquid investments with a maturity of three months or less when purchased to be cash equivalents. The Company
invests excess cash in a money market account. The following table summarizes cash and cash equivalents as of January 31, 2022 and April
30, 2021:</span></p>

<p id="xdx_893_eus-gaap--ScheduleOfCashAndCashEquivalentsTableTextBlock_z1g40OImlpYg" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;<span id="xdx_8BC_zp9nKkjhsHHl" style="display: none">Schedule of Cash and Cash Equivalents</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
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    <td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">April
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    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="6" style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(in
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    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td id="xdx_98E_eus-gaap--CashAndCashEquivalentsAtCarryingValue_c20220131__us-gaap--CashAndCashEquivalentsAxis__custom--CheckingAndSavingsAccountsMember_pn3n3" style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right" title="Cash and cash equivalents"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">1,519</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td id="xdx_98D_eus-gaap--CashAndCashEquivalentsAtCarryingValue_c20210430__us-gaap--CashAndCashEquivalentsAxis__custom--CheckingAndSavingsAccountsMember_pn3n3" style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right" title="Cash and cash equivalents"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">1,850</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
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    market account</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td id="xdx_988_eus-gaap--CashAndCashEquivalentsAtCarryingValue_c20220131__us-gaap--CashAndCashEquivalentsAxis__us-gaap--MoneyMarketFundsMember_pn3n3" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Cash and cash equivalents"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">61,935</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td id="xdx_989_eus-gaap--CashAndCashEquivalentsAtCarryingValue_c20210430__us-gaap--CashAndCashEquivalentsAxis__us-gaap--MoneyMarketFundsMember_pn3n3" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Cash and cash equivalents"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">81,178</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td id="xdx_982_eus-gaap--CashAndCashEquivalentsAtCarryingValue_c20220131_pn3n3" style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Cash and cash equivalents"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">63,454</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td id="xdx_98E_eus-gaap--CashAndCashEquivalentsAtCarryingValue_c20210430_pn3n3" style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Cash and cash equivalents"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">83,028</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  </table>

<p id="xdx_8AA_zetvsuuSeyZf" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Restricted
Cash and Security Agreements</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company has a letter of credit agreement with Santander Bank, N.A. (&#8220;Santander&#8221;). Cash of $<span id="xdx_90E_eus-gaap--Deposits_c20220131__us-gaap--TypeOfArrangementAxis__custom--RestrictedCashAndSecurityAgreementsMember__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--SantanderBankMember__us-gaap--ShortTermDebtTypeAxis__us-gaap--LetterOfCreditMember_pp0p0" title="Deposits">157,000</span> is on deposit at Santander
and serves as security for a letter of credit issued by Santander for the lease of warehouse/office space in Monroe Township, New Jersey.
This agreement cannot be extended beyond July 31, 2025 and is cancellable at the discretion of Santander.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Santander
also issued two letters of credit to subsidiaries of Enel Green Power (&#8220;EGP&#8221;) pursuant to the Company&#8217;s contracts with
EGP. The first letter of credit was issued in the amount of $<span id="xdx_906_eus-gaap--LettersOfCreditOutstandingAmount_c20220131__us-gaap--TypeOfArrangementAxis__custom--RestrictedCashAndSecurityAgreementsMember__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--SantanderBankMember__us-gaap--ShortTermDebtTypeAxis__custom--LetterOneMember_pp0p0">126,000
</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">that will be released 12 months after the PB3
PowerBuoy<sup>&#174; </sup>(&#8220;PB3&#8221;) is fully deployed. The second letter of credit was issued in the amount of $<span id="xdx_90C_eus-gaap--LettersOfCreditOutstandingAmount_c20220131__us-gaap--TypeOfArrangementAxis__custom--RestrictedCashAndSecurityAgreementsMember__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--SantanderBankMember__us-gaap--ShortTermDebtTypeAxis__custom--LetterTwoMember_pp0p0">645,000
</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">and was reduced to $<span id="xdx_908_eus-gaap--LettersOfCreditOutstandingAmount_c20200831__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--SantanderBankMember__us-gaap--ShortTermDebtTypeAxis__custom--LetterTwoMember__us-gaap--AwardDateAxis__custom--AugustTwentyTwentyMember_pp0p0">323,000
</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">in August 2020. The second letter of credit will
be reduced by $<span id="xdx_900_ecustom--LettersOfCreditIssuedAmount_iI_pp0p0_c20220131__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--SantanderBankMember__us-gaap--ShortTermDebtTypeAxis__custom--LetterTwoMember_zBZcN1vaN5D3" title="Letters of credit issued amount">259,000
</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">once the PB3 is fully deployed and passes
final acceptance testing. The remaining restricted amount of $<span id="xdx_901_ecustom--LettersOfCreditIssuedAmount_iI_pp0p0_c20220131__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--SantanderBankMember_zY2nQsgGT38a" title="Letters of credit issued amount">64,000
</span></span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">will be released 12 months after the buoy
is fully deployed.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p id="xdx_89F_eus-gaap--ScheduleOfRestrictedCashAndCashEquivalentsTextBlock_zFgX8DyXBl54" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
following table provides a reconciliation of cash, cash equivalents and restricted cash reported within the Consolidated Balance Sheets
that total to the same amounts shown in the Consolidated Statements of Cash Flows.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;<span id="xdx_8B1_zzRbhmGQtXKi" style="display: none">Schedule of Cash and Cash Equivalents and Restricted Cash</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" id="xdx_499_20220131_zWmhr3VYpfF6" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">January
    31, 2022</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" id="xdx_499_20210430_zeSCmu5tUIAl" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">April
    30, 2021</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="6" style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(in
    thousands)</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_40E_eus-gaap--CashAndCashEquivalentsAtCarryingValue_iI_pn3n3" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 64%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Cash
    and cash equivalents</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">63,454</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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  <tr id="xdx_401_eus-gaap--RestrictedCashCurrent_iI_pn3n3" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Restricted
    cash- short term</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">384</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">384</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_40F_eus-gaap--RestrictedCashNoncurrent_iI_pn3n3" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Restricted
    cash- long term</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">222</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">222</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_40B_eus-gaap--CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_iI_pn3n3" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="display: none; font-family: Times New Roman, Times, Serif; font-size: 10pt">Cash,
    cash equivalents and restricted cash</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">64,060</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">83,634</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  </table>

<p id="xdx_8A8_ztfYL56COu66" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ConcentrationRiskCreditRisk', window );">Concentration of Credit Risk</a></td>
<td class="text"><p id="xdx_841_eus-gaap--ConcentrationRiskCreditRisk_zLv29a9Vu6D1" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>(d)
<span id="xdx_860_zscMqxtILrm2">Concentration of Credit Risk</span></i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Financial
instruments that potentially subject the Company to credit risk consist principally of accounts receivable and cash and cash equivalents.
The Company believes that its current contracts do not represent a risk of collectability on its receivables. The Company invests its
excess cash in a money market account and does not believe that it is exposed to any significant risks related to its cash and money
market accounts. Cash and cash equivalents are also maintained at foreign financial institutions. Cash and cash equivalents in foreign
financial institutions as of January 31, 2022 was $<span id="xdx_901_eus-gaap--CashAndCashEquivalentsAtCarryingValue_c20220131__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--ForeignFinancialInstitutionsMember_pp0p0" title="Cash and Cash Equivalents, at Carrying Value">30,000</span>.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"/>



<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p id="xdx_896_eus-gaap--ScheduleOfRevenueByMajorCustomersByReportingSegmentsTableTextBlock_zE4Zaw2bCATl" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
table below shows the amount of the Company&#8217;s revenues derived from customers whose revenues accounted for at least 10% of the
Company&#8217;s consolidated revenues for at least one of the periods indicated:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;<span id="xdx_8BF_zpKS8GyJEw06" style="display: none">Schedule of Revenue by Major Customers by Reporting Segments</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="font: 10pt Times New Roman, Times, Serif; display: none; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" id="xdx_490_20211101__20220131_ze45TaeFeBRj" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">2022</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" id="xdx_493_20201101__20210131_zmg6Jp1On4D9" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">2021</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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    <td colspan="2" id="xdx_494_20200501__20210131_zvNGSdxep4g5" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">2021</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="6" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Three
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    <td colspan="6" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Nine
    months ended January 31,</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
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  <tr id="xdx_408_eus-gaap--RevenueFromContractWithCustomerExcludingAssessedTax_pn3n3_hus-gaap--ConcentrationRiskByBenchmarkAxis__us-gaap--SalesRevenueNetMember__us-gaap--ConcentrationRiskByTypeAxis__us-gaap--CustomerConcentrationRiskMember__srt--MajorCustomersAxis__custom--EniSPAMember_zki3jOC14VUc" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
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  <tr id="xdx_403_eus-gaap--RevenueFromContractWithCustomerExcludingAssessedTax_pn3n3_hus-gaap--ConcentrationRiskByBenchmarkAxis__us-gaap--SalesRevenueNetMember__us-gaap--ConcentrationRiskByTypeAxis__us-gaap--CustomerConcentrationRiskMember__srt--MajorCustomersAxis__custom--DepartmentOfEnergyMember_zj3dzoPzdQ4e" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
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  <tr id="xdx_402_eus-gaap--RevenueFromContractWithCustomerExcludingAssessedTax_pn3n3_hus-gaap--ConcentrationRiskByBenchmarkAxis__us-gaap--SalesRevenueNetMember__us-gaap--ConcentrationRiskByTypeAxis__us-gaap--CustomerConcentrationRiskMember__srt--MajorCustomersAxis__custom--EGPMember_zajw0pFUuPlk" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
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  <tr id="xdx_406_eus-gaap--RevenueFromContractWithCustomerExcludingAssessedTax_pn3n3_hus-gaap--ConcentrationRiskByBenchmarkAxis__us-gaap--SalesRevenueNetMember__us-gaap--ConcentrationRiskByTypeAxis__us-gaap--CustomerConcentrationRiskMember__srt--MajorCustomersAxis__custom--ACETMember_zGXHpKdgpmu2" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
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    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">33</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span style="-sec-ix-hidden: xdx2ixbrl1034">&#8212;</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">37</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_406_eus-gaap--RevenueFromContractWithCustomerExcludingAssessedTax_pn3n3_hus-gaap--ConcentrationRiskByBenchmarkAxis__us-gaap--SalesRevenueNetMember__us-gaap--ConcentrationRiskByTypeAxis__us-gaap--CustomerConcentrationRiskMember__srt--MajorCustomersAxis__custom--ValarisFNIMember_zGv69smIwPYb" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Valaris
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    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span style="-sec-ix-hidden: xdx2ixbrl1038">&#8212;</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span style="-sec-ix-hidden: xdx2ixbrl1040">&#8212;</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_405_eus-gaap--RevenueFromContractWithCustomerExcludingAssessedTax_pn3n3_hus-gaap--ConcentrationRiskByBenchmarkAxis__us-gaap--SalesRevenueNetMember__us-gaap--ConcentrationRiskByTypeAxis__us-gaap--CustomerConcentrationRiskMember__srt--MajorCustomersAxis__custom--BrighamYoungUniversityMember_zB91P7eS4Nll" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
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    Young University <span id="xdx_F5E_zVuXMILQPuSi">(2)</span></span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span style="-sec-ix-hidden: xdx2ixbrl1043">&#8212;</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">66</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span style="-sec-ix-hidden: xdx2ixbrl1045">&#8212;</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_407_eus-gaap--RevenueFromContractWithCustomerExcludingAssessedTax_pn3n3_hus-gaap--ConcentrationRiskByBenchmarkAxis__us-gaap--SalesRevenueNetMember__us-gaap--ConcentrationRiskByTypeAxis__us-gaap--CustomerConcentrationRiskMember__srt--MajorCustomersAxis__custom--NipponKaiyoMember_zB2to4fwMr6e" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Nippon
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  <tr id="xdx_404_eus-gaap--RevenueFromContractWithCustomerExcludingAssessedTax_pn3n3_hus-gaap--ConcentrationRiskByBenchmarkAxis__us-gaap--SalesRevenueNetMember__us-gaap--ConcentrationRiskByTypeAxis__us-gaap--CustomerConcentrationRiskMember__srt--MajorCustomersAxis__custom--OtherMember_zUrHidpm8dM" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
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  </table>


<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif; padding-right: 2.65pt; text-align: right; width: 40%"><span id="xdx_F04_zZURkolW8eg4" style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(1)</span></td>
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  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: #CCEEFF">
    <td style="font: 10pt Times New Roman, Times, Serif; padding-right: 2.65pt; text-align: right"><span id="xdx_F0C_ztPx7WLQvE09" style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(2)</span></td>
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  </table>
<p id="xdx_8A2_zpoEBfu5dakd" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>&#160;</b></span></p>

<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy', window );">Share-Based Compensation</a></td>
<td class="text"><p id="xdx_849_eus-gaap--ShareBasedCompensationOptionAndIncentivePlansPolicy_zuPdUUyPHCpd" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>(e)
<span id="xdx_86E_zrwZKoyPUhQ5">Share-Based Compensation</span></i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Costs
resulting from all share-based payment transactions are recognized in the consolidated financial statements at their fair values. The
following table summarizes share-based compensation related to the Company&#8217;s share-based plans by expense category for the three
and nine months ended January 31, 2022 and 2021:</span></p>

<p id="xdx_89D_eus-gaap--ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock_zD5DdwwOJ1E2" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;<span id="xdx_8BF_z6z14Asmywua" style="display: none">Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
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<tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
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    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 12%; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">91</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_40D_eus-gaap--ShareBasedCompensation_hus-gaap--IncomeStatementLocationAxis__us-gaap--SellingGeneralAndAdministrativeExpensesMember_zxINEzOp9n77" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Selling,
    general and administrative</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">108</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">83</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">313</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">247</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_403_eus-gaap--ShareBasedCompensation_i_pn3n3" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Total
    share-based compensation expense</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">317</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">115</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">864</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">338</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  </table>

<p id="xdx_8AE_zUTay3HR9Vs4" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_RevenueFromContractWithCustomerPolicyTextBlock', window );">Revenue Recognition</a></td>
<td class="text"><p id="xdx_844_eus-gaap--RevenueFromContractWithCustomerPolicyTextBlock_zrwrCS2Zd6D7" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(f)
<i><span id="xdx_869_z0nOgDU7qY93">Revenue Recognition</span></i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">A
performance obligation is the unit of account for revenue recognition. The Company assesses the goods or services promised in a contract
with a customer and identifies as a performance obligation either: a) a good or service (or a bundle of goods or services) that is distinct;
or b) a series of distinct goods or services that are substantially the same and that have the same pattern of transfer to the customer.
A contract may contain a single or multiple performance obligations. For contracts with multiple performance obligations, the Company
allocates the contracted transaction price to each performance obligation based upon the relative standalone selling price, which represents
the price the Company would sell a promised good or service separately to a customer. The Company determines the standalone selling price
based upon the facts and circumstances of each obligated good or service. The majority of the Company&#8217;s contracts have no observable
standalone selling price since the associated products and services are customized to customer specifications. As such, the standalone
selling price generally reflects the Company&#8217;s forecast of the total cost to satisfy the performance obligation plus an appropriate
profit margin.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
nature of the Company&#8217;s contracts may give rise to several types of variable consideration, including unpriced change orders and
liquidated damages and penalties. Variable consideration can also arise from modifications to the scope of services. Variable consideration
is included in the transaction price to the extent it is probable that a significant reversal of cumulative revenue recognized will not
occur once the uncertainty associated with the variable consideration is resolved. Our estimates of variable consideration and determination
of whether to include such amounts in the transaction price are based largely on our assessment of legal enforceability, performance,
and any other information (historical, current, and forecasted) that is reasonably available to us. There was no variable consideration
as of January 31, 2022 or 2021. The Company presents shipping and handling costs, that occur after control of the promised goods or services
transfer to the customer, as fulfillment costs rather than evaluating whether the shipping and handling activities are promised services
to the customer.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"/>



<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company recognizes revenue when or as it satisfies a performance obligation by transferring a good or service to a customer, either (1)
at a point in time or (2) over time. A good or service is transferred when, or as, the customer obtains control. The evaluation of whether
control of each performance obligation is transferred at a point in time or over time is made at contract inception. Input measures such
as costs incurred or time elapsed are utilized to assess progress against specific contractual performance obligations for the Company&#8217;s
services. The selection of the method to measure progress towards completion requires judgment and is based on the nature of the services
to be provided. For the Company, the input method using costs incurred or time elapsed best represents the measure of progress against
the performance obligations incorporated within the contractual agreements. If estimated total costs on any contract project a loss,
the Company charges the entire estimated loss to operations in the period the loss becomes known. The cumulative effect of revisions
to revenue, estimated costs to complete contracts, including penalties, incentive awards, change orders, claims, anticipated losses,
and others are recorded in the accounting period in which the events indicating a loss are known and the loss can be reasonably estimated.
These loss projects are re-assessed for each subsequent reporting period until the project is complete. Such revisions could occur at
any time and the effects may be material.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company&#8217;s contracts are either cost plus or fixed price contracts. Under cost plus contracts, customers are billed for actual expenses
incurred plus an agreed-upon fee. Under cost plus contracts, a profit or loss on a project is recognized depending on whether actual
costs are more or less than the agreed upon amount.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company has two types of fixed price contracts, firm fixed price and cost-sharing. Under firm fixed price contracts, the Company receives
an agreed-upon amount for providing products and services specified in the contract, and a profit or loss is recognized depending on
whether actual costs are more or less than the agreed upon amount. Under cost-sharing contracts, the fixed amount agreed upon with the
customer is only intended to fund a portion of the costs on a specific project. Under cost sharing contracts, an amount corresponding
to the revenue is recorded in cost of revenues, resulting in gross profit on these contracts of zero. The Company&#8217;s share of the
costs is recorded as product development expense. The Company reports its disaggregation of revenue by contract type since this method
best represents the Company&#8217;s business. For the nine-month periods ended January 31, 2022 and 2021, all of the Company&#8217;s
contracts were classified as firm fixed price.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">As
of January 31, 2022, the Company&#8217;s total remaining performance obligations, also referred to as backlog, totaled $<span id="xdx_908_eus-gaap--RevenueRemainingPerformanceObligation_iI_pn5n6_c20220131_zPQxAxDAE4c2" title="Revenue remaining performance obligation">0.8</span> million.
The Company expects to recognize <span id="xdx_900_ecustom--RevenueRemainingPerformancesObligationPercentage_pid_dp_uPure_c20210501__20220131_zLCFe6fEpFU8" title="Revenue remaining performance obligation, percentage">100</span>% of the remaining performance obligations as revenue over the next twelve months.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company also enters into lease arrangements for its PB3 and our Wave Adaptive Modular Vessels (&#8220;WAM-V&#8221;) with certain customers.
Revenue related to multiple-element arrangements is allocated to lease and non-lease elements based on their relative standalone selling
prices or expected cost plus a margin approach. Lease elements generally include a PB3 and components, while non-lease elements generally
include engineering, monitoring and support services. In the lease arrangement, the customer is provided an option to extend the lease
term or purchase the leased PB3 at some point during and/or at the end of the lease term.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Products
and Solutions Leasing</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company enters into lease arrangements with certain customers for their products and solutions. As of January 31, 2022, the Company had
one lease arrangement with a remaining operating lease term of less than 7 months. Revenue related to multiple-element arrangements is
allocated to lease and non-lease elements based on their relative standalone selling prices or expected cost plus a margin approach.
Lease elements generally include a PB3 and components, while non-lease elements generally include engineering, monitoring and support
services. In the lease arrangement, the customer is provided an option to extend the lease term or purchase the leased PB3 at some point
during and/or at the end of the lease term.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"/>



<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company classifies leases as either operating or financing in accordance with the authoritative accounting guidance contained within
ASC Topic 842, <i>&#8220;Leases&#8221;.</i> At inception of the contract, the Company evaluates the lease against the lease classification
criteria within ASC Topic 842. If the direct financing or sales-type classification criteria are met, then the lease is accounted for
as a finance lease. All other leases are treated as operating leases.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company recognizes revenue from operating lease arrangements generally on a straight-line basis over the lease term which is presented
in Revenues in the Consolidated Statements of Operations. The lease revenue for the nine months ended January 31, 2022 and 2021 was immaterial.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_EarningsPerSharePolicyTextBlock', window );">Net Loss per Common Share</a></td>
<td class="text"><p id="xdx_84E_eus-gaap--EarningsPerSharePolicyTextBlock_zZvX1ipIWb21" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>(g)
<span id="xdx_868_znU2KJI53lPd">Net Loss per Common Share</span></i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Basic
and diluted net loss per common share for all periods presented is computed by dividing net loss by the weighted average number of shares
of common stock and common stock equivalents outstanding during the periods. The pre-funded warrants were determined to be common stock
equivalents and have been included in the weighted average number of shares outstanding for calculation of basic net loss per common
share . Due to the Company&#8217;s net losses, potentially dilutive securities, consisting of options to purchase shares of common stock,
warrants on common stock and unvested restricted stock issued to employees and non-employee directors, were excluded from the diluted
net loss per common share calculation due to their anti-dilutive effect.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">In
computing diluted net loss per common share on the Consolidated Statements of Operations, warrants exercisable for common stock, options
to purchase shares of common stock and non-vested restricted stock issued to employees and non-employee directors, totaling <span id="xdx_909_eus-gaap--AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_c20210501__20220131_pdd" title="Antidilutive securities excluded from computation of earnings per share, amount">6,356,123</span>
and <span id="xdx_90F_eus-gaap--AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_c20200501__20210131_pdd" title="Antidilutive securities excluded from computation of earnings per share, amount">5,221,258</span> for the nine months ended January 31, 2022 and 2021, respectively, were excluded from each of the computations as the effect
would be anti-dilutive due to the Company&#8217;s net losses.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock', window );">Recently Issued Accounting Standards</a></td>
<td class="text"><p id="xdx_84E_eus-gaap--NewAccountingPronouncementsPolicyPolicyTextBlock_zjFZOjb69SVc" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>(h)
<span id="xdx_867_zg3Bffmmat3d">Recently Issued Accounting Standards</span></i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">In
June 2016, the Financial Accounting Standards Board (&#8220;FASB&#8221;) issued ASU No. 2016-13, &#8220;<i>Financial Instruments </i>-
<i>Credit Losses (Topic 326), Measurement of Credit Losses on Financial Instruments.&#8221; </i>This amendment replaces the incurred
loss impairment methodology in current GAAP with a methodology that reflects expected credit losses on instruments within its scope,
including trade receivables. This update is intended to provide financial statement users with more decision-useful information about
the expected credit losses. In November 2019, the FASB issued No. 2019-10, <i>Financial Instruments&#8212;Credit Losses (Topic 326),
Derivatives and Hedging (Topic 815), and Leases (Topic 842)</i>, which deferred the effective date of ASU 2016-13 for Smaller Reporting
Companies for fiscal years beginning after December 15, 2022, including interim periods within those fiscal years. The Company is
currently evaluating the impact of the adoption of ASU 2016-13 on its consolidated financial statements.</span></p>

<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AccountingPoliciesAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Entity's cash and cash equivalents accounting policy with respect to restricted balances.  Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 942<br> -SubTopic 210<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.9-03(1)(a))<br> -URI http://asc.fasb.org/extlink&amp;oid=120398452&amp;loc=d3e534808-122878<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(1))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 50<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=123431023&amp;loc=d3e4273-108586<br></p></div>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Disclosure of accounting policy for credit risk.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 275<br> -SubTopic 10<br> -Section 50<br> -Paragraph 1<br> -Subparagraph (d)<br> -URI http://asc.fasb.org/extlink&amp;oid=99393423&amp;loc=d3e5967-108592<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 942<br> -SubTopic 825<br> -Section 50<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=123345438&amp;loc=d3e61044-112788<br></p></div>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Disclosure of accounting policy regarding (1) the principles it follows in consolidating or combining the separate financial statements, including the principles followed in determining the inclusion or exclusion of subsidiaries or other entities in the consolidated or combined financial statements and (2) its treatment of interests (for example, common stock, a partnership interest or other means of exerting influence) in other entities, for example consolidation or use of the equity or cost methods of accounting.  The accounting policy may also address the accounting treatment for intercompany accounts and transactions, noncontrolling interest, and the income statement treatment in consolidation for issuances of stock by a subsidiary.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 235<br> -SubTopic 10<br> -Section 50<br> -Paragraph 4<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123372394&amp;loc=d3e18823-107790<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 810<br> -SubTopic 10<br> -Section 50<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=109239629&amp;loc=d3e5614-111684<br></p></div>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Disclosure of accounting policy for computing basic and diluted earnings or loss per share for each class of common stock and participating security. Addresses all significant policy factors, including any antidilutive items that have been excluded from the computation and takes into account stock dividends, splits and reverse splits that occur after the balance sheet date of the latest reporting period but before the issuance of the financial statements.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 260<br> -SubTopic 10<br> -Section 50<br> -Paragraph 1<br> -Subparagraph (c)<br> -URI http://asc.fasb.org/extlink&amp;oid=124432515&amp;loc=d3e3550-109257<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 260<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=124432515&amp;loc=d3e3630-109257<br></p></div>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Disclosure of accounting policy pertaining to new accounting pronouncements that may impact the entity's financial reporting. Includes, but is not limited to, quantification of the expected or actual impact.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Disclosure of accounting policy for revenue from contract with customer.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 606<br> -SubTopic 10<br> -Section 50<br> -Paragraph 17<br> -URI http://asc.fasb.org/extlink&amp;oid=123351226&amp;loc=SL49130561-203045<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 606<br> -SubTopic 10<br> -Section 50<br> -Paragraph 20<br> -Subparagraph (d)<br> -URI http://asc.fasb.org/extlink&amp;oid=123351226&amp;loc=SL49130566-203045<br><br>Reference 3: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 606<br> -SubTopic 10<br> -Section 50<br> -Paragraph 18<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=123351226&amp;loc=SL49130563-203045<br><br>Reference 4: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 606<br> -URI http://asc.fasb.org/topic&amp;trid=49130388<br><br>Reference 5: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 606<br> -SubTopic 10<br> -Section 50<br> -Paragraph 20<br> -Subparagraph (c)<br> -URI http://asc.fasb.org/extlink&amp;oid=123351226&amp;loc=SL49130566-203045<br><br>Reference 6: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 606<br> -SubTopic 10<br> -Section 50<br> -Paragraph 18<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123351226&amp;loc=SL49130563-203045<br><br>Reference 7: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 235<br> -SubTopic 10<br> -Section 50<br> -Paragraph 4<br> -Subparagraph (e)<br> -URI http://asc.fasb.org/extlink&amp;oid=123372394&amp;loc=d3e18823-107790<br><br>Reference 8: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 606<br> -SubTopic 10<br> -Section 50<br> -Paragraph 20<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=123351226&amp;loc=SL49130566-203045<br><br>Reference 9: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 606<br> -SubTopic 10<br> -Section 50<br> -Paragraph 19<br> -URI http://asc.fasb.org/extlink&amp;oid=123351226&amp;loc=SL49130564-203045<br><br>Reference 10: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 606<br> -SubTopic 10<br> -Section 50<br> -Paragraph 20<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123351226&amp;loc=SL49130566-203045<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Disclosure of accounting policy for award under share-based payment arrangement. Includes, but is not limited to, methodology and assumption used in measuring cost.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (b),(f)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5047-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Disclosure of accounting policy for the use of estimates in the preparation of financial statements in conformity with generally accepted accounting principles.</p></div>
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<span style="display: none;">v3.22.0.1</span><table class="report" border="0" cellspacing="2" id="idm140163163135464">
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<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Summary of Significant Accounting Policies (Tables)<br></strong></div></th>
<th class="th" colspan="1">9 Months Ended</th>
</tr>
<tr><th class="th"><div>Jan. 31, 2022</div></th></tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AccountingPoliciesAbstract', window );"><strong>Accounting Policies [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ScheduleOfCashAndCashEquivalentsTableTextBlock', window );">Schedule of Cash and Cash Equivalents</a></td>
<td class="text"><p id="xdx_893_eus-gaap--ScheduleOfCashAndCashEquivalentsTableTextBlock_z1g40OImlpYg" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;<span id="xdx_8BC_zp9nKkjhsHHl" style="display: none">Schedule of Cash and Cash Equivalents</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">January
    31, 2022</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">April
    30, 2021</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="6" style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(in
    thousands)</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 64%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Checking
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    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td id="xdx_98E_eus-gaap--CashAndCashEquivalentsAtCarryingValue_c20220131__us-gaap--CashAndCashEquivalentsAxis__custom--CheckingAndSavingsAccountsMember_pn3n3" style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right" title="Cash and cash equivalents"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">1,519</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td id="xdx_98D_eus-gaap--CashAndCashEquivalentsAtCarryingValue_c20210430__us-gaap--CashAndCashEquivalentsAxis__custom--CheckingAndSavingsAccountsMember_pn3n3" style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right" title="Cash and cash equivalents"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">1,850</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Money
    market account</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td id="xdx_988_eus-gaap--CashAndCashEquivalentsAtCarryingValue_c20220131__us-gaap--CashAndCashEquivalentsAxis__us-gaap--MoneyMarketFundsMember_pn3n3" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Cash and cash equivalents"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">61,935</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td id="xdx_989_eus-gaap--CashAndCashEquivalentsAtCarryingValue_c20210430__us-gaap--CashAndCashEquivalentsAxis__us-gaap--MoneyMarketFundsMember_pn3n3" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Cash and cash equivalents"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">81,178</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td id="xdx_982_eus-gaap--CashAndCashEquivalentsAtCarryingValue_c20220131_pn3n3" style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Cash and cash equivalents"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">63,454</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td id="xdx_98E_eus-gaap--CashAndCashEquivalentsAtCarryingValue_c20210430_pn3n3" style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Cash and cash equivalents"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">83,028</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  </table>

<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ScheduleOfRestrictedCashAndCashEquivalentsTextBlock', window );">Schedule of Cash and Cash Equivalents and Restricted Cash</a></td>
<td class="text"><p id="xdx_89F_eus-gaap--ScheduleOfRestrictedCashAndCashEquivalentsTextBlock_zFgX8DyXBl54" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
following table provides a reconciliation of cash, cash equivalents and restricted cash reported within the Consolidated Balance Sheets
that total to the same amounts shown in the Consolidated Statements of Cash Flows.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;<span id="xdx_8B1_zzRbhmGQtXKi" style="display: none">Schedule of Cash and Cash Equivalents and Restricted Cash</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" id="xdx_499_20220131_zWmhr3VYpfF6" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">January
    31, 2022</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" id="xdx_499_20210430_zeSCmu5tUIAl" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">April
    30, 2021</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="6" style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(in
    thousands)</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_40E_eus-gaap--CashAndCashEquivalentsAtCarryingValue_iI_pn3n3" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 64%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Cash
    and cash equivalents</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">63,454</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">83,028</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_401_eus-gaap--RestrictedCashCurrent_iI_pn3n3" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Restricted
    cash- short term</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">384</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">384</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_40F_eus-gaap--RestrictedCashNoncurrent_iI_pn3n3" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Restricted
    cash- long term</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">222</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">222</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_40B_eus-gaap--CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_iI_pn3n3" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="display: none; font-family: Times New Roman, Times, Serif; font-size: 10pt">Cash,
    cash equivalents and restricted cash</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">64,060</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">83,634</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  </table>

<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ScheduleOfRevenueByMajorCustomersByReportingSegmentsTableTextBlock', window );">Schedule of Revenue by Major Customers by Reporting Segments</a></td>
<td class="text"><p id="xdx_896_eus-gaap--ScheduleOfRevenueByMajorCustomersByReportingSegmentsTableTextBlock_zE4Zaw2bCATl" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
table below shows the amount of the Company&#8217;s revenues derived from customers whose revenues accounted for at least 10% of the
Company&#8217;s consolidated revenues for at least one of the periods indicated:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;<span id="xdx_8BF_zpKS8GyJEw06" style="display: none">Schedule of Revenue by Major Customers by Reporting Segments</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="font: 10pt Times New Roman, Times, Serif; display: none; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" id="xdx_490_20211101__20220131_ze45TaeFeBRj" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">2022</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" id="xdx_493_20201101__20210131_zmg6Jp1On4D9" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">2021</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" id="xdx_49C_20210501__20220131_zj0XbYPKsZuj" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">2022</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
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  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
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  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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  <tr id="xdx_408_eus-gaap--RevenueFromContractWithCustomerExcludingAssessedTax_pn3n3_hus-gaap--ConcentrationRiskByBenchmarkAxis__us-gaap--SalesRevenueNetMember__us-gaap--ConcentrationRiskByTypeAxis__us-gaap--CustomerConcentrationRiskMember__srt--MajorCustomersAxis__custom--EniSPAMember_zki3jOC14VUc" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
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  <tr id="xdx_403_eus-gaap--RevenueFromContractWithCustomerExcludingAssessedTax_pn3n3_hus-gaap--ConcentrationRiskByBenchmarkAxis__us-gaap--SalesRevenueNetMember__us-gaap--ConcentrationRiskByTypeAxis__us-gaap--CustomerConcentrationRiskMember__srt--MajorCustomersAxis__custom--DepartmentOfEnergyMember_zj3dzoPzdQ4e" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
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  <tr id="xdx_402_eus-gaap--RevenueFromContractWithCustomerExcludingAssessedTax_pn3n3_hus-gaap--ConcentrationRiskByBenchmarkAxis__us-gaap--SalesRevenueNetMember__us-gaap--ConcentrationRiskByTypeAxis__us-gaap--CustomerConcentrationRiskMember__srt--MajorCustomersAxis__custom--EGPMember_zajw0pFUuPlk" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
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  <tr id="xdx_406_eus-gaap--RevenueFromContractWithCustomerExcludingAssessedTax_pn3n3_hus-gaap--ConcentrationRiskByBenchmarkAxis__us-gaap--SalesRevenueNetMember__us-gaap--ConcentrationRiskByTypeAxis__us-gaap--CustomerConcentrationRiskMember__srt--MajorCustomersAxis__custom--ACETMember_zGXHpKdgpmu2" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
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  <tr id="xdx_406_eus-gaap--RevenueFromContractWithCustomerExcludingAssessedTax_pn3n3_hus-gaap--ConcentrationRiskByBenchmarkAxis__us-gaap--SalesRevenueNetMember__us-gaap--ConcentrationRiskByTypeAxis__us-gaap--CustomerConcentrationRiskMember__srt--MajorCustomersAxis__custom--ValarisFNIMember_zGv69smIwPYb" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Valaris
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    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span style="-sec-ix-hidden: xdx2ixbrl1038">&#8212;</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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  <tr id="xdx_405_eus-gaap--RevenueFromContractWithCustomerExcludingAssessedTax_pn3n3_hus-gaap--ConcentrationRiskByBenchmarkAxis__us-gaap--SalesRevenueNetMember__us-gaap--ConcentrationRiskByTypeAxis__us-gaap--CustomerConcentrationRiskMember__srt--MajorCustomersAxis__custom--BrighamYoungUniversityMember_zB91P7eS4Nll" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Brigham
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  <tr id="xdx_40A_eus-gaap--RevenueFromContractWithCustomerExcludingAssessedTax_pn3n3_hus-gaap--ConcentrationRiskByBenchmarkAxis__us-gaap--SalesRevenueNetMember__us-gaap--ConcentrationRiskByTypeAxis__us-gaap--CustomerConcentrationRiskMember__srt--MajorCustomersAxis__custom--NavalSurfaceWarfareCenterMember_zlqYIer8uzHa" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
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  <tr id="xdx_404_eus-gaap--RevenueFromContractWithCustomerExcludingAssessedTax_pn3n3_hus-gaap--ConcentrationRiskByBenchmarkAxis__us-gaap--SalesRevenueNetMember__us-gaap--ConcentrationRiskByTypeAxis__us-gaap--CustomerConcentrationRiskMember__srt--MajorCustomersAxis__custom--OtherMember_zUrHidpm8dM" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Other
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    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">27</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">260</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif; padding-right: 2.65pt; text-align: right; width: 40%"><span id="xdx_F04_zZURkolW8eg4" style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(1)</span></td>
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  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: #CCEEFF">
    <td style="font: 10pt Times New Roman, Times, Serif; padding-right: 2.65pt; text-align: right"><span id="xdx_F0C_ztPx7WLQvE09" style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(2)</span></td>
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  </table>
<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock', window );">Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs</a></td>
<td class="text"><p id="xdx_89D_eus-gaap--ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock_zD5DdwwOJ1E2" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;<span id="xdx_8BF_z6z14Asmywua" style="display: none">Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
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<tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
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    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Tabular disclosure of cash and cash equivalents restricted as to withdrawal or usage.</p></div>
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<span style="display: none;">v3.22.0.1</span><table class="report" border="0" cellspacing="2" id="idm140163161875112">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Account Receivable and Contract Assets (Tables)<br></strong></div></th>
<th class="th" colspan="1">9 Months Ended</th>
</tr>
<tr><th class="th"><div>Jan. 31, 2022</div></th></tr>
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;<span id="xdx_8B3_zG1WN85sW172" style="display: none">Schedule of Accounts Receivable, Contract Assets and Contract Liabilities</span></span></p>

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  <tr id="xdx_401_eus-gaap--AccountsReceivableNetCurrent_iI_pn3n3" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 64%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Accounts
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<span></span>
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<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ContractWithCustomerAssetAndLiabilityTableTextBlock', window );">Schedule of Significant Changes in Contract Assets and Contract Liabilities</a></td>
<td class="text"><p id="xdx_895_eus-gaap--ContractWithCustomerAssetAndLiabilityTableTextBlock_zu9tO89eHz01" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;<span id="xdx_8BC_zY5tgvGeojuj" style="display: none">Schedule of Significant Changes in Contract Assets and Contract Liabilities</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
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    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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    months ended January 31, 2022</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
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    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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  <tr id="xdx_40A_eus-gaap--ContractWithCustomerAssetNet_iE_pn3n3_zSo6j0097m1c" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
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<span></span>
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<span style="display: none;">v3.22.0.1</span><table class="report" border="0" cellspacing="2" id="idm140163162485688">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Other Current Assets (Tables)<br></strong></div></th>
<th class="th" colspan="1">9 Months Ended</th>
</tr>
<tr><th class="th"><div>Jan. 31, 2022</div></th></tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_DeferredCostsCapitalizedPrepaidAndOtherAssetsDisclosureAbstract', window );"><strong>Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]</strong></a></td>
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</td>
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<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ScheduleOfOtherCurrentAssetsTableTextBlock', window );">Schedule of Other Current Assets</a></td>
<td class="text"><p id="xdx_894_eus-gaap--ScheduleOfOtherCurrentAssetsTableTextBlock_zOb9oIGBliWe" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Other
current assets consisted of the following at January 31, 2022 and April 30, 2021:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;<span id="xdx_8BE_zUQHnlgidtGh" style="display: none">Schedule of Other Current Assets</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
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    <td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" id="xdx_499_20220131_zyvdMlf294i6" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">January
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  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
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  <tr id="xdx_40D_ecustom--PrepaidRecruitingAndHR_iI_pn3n3_maOACz300_zAWlyggL0ss8" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
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<span style="display: none;">v3.22.0.1</span><table class="report" border="0" cellspacing="2" id="idm140163162497784">
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<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Property and Equipment, net (Tables)<br></strong></div></th>
<th class="th" colspan="1">9 Months Ended</th>
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<tr><th class="th"><div>Jan. 31, 2022</div></th></tr>
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<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PropertyPlantAndEquipmentTextBlock', window );">Schedule of Components of Property and Equipment</a></td>
<td class="text"><p id="xdx_89B_eus-gaap--PropertyPlantAndEquipmentTextBlock_zkS29BFv5Ahj" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
components of property and equipment, net as of January 31, 2022 and April 30, 2021 consisted of the following:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;<span id="xdx_8BA_zQ9sv7Oqikt5" style="display: none">Schedule of Components of Property and Equipment</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
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    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" id="xdx_498_20220131_zLd1JW1a8JH8" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">January
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  <tr id="xdx_404_eus-gaap--PropertyPlantAndEquipmentGross_iI_pn3n3_hus-gaap--PropertyPlantAndEquipmentByTypeAxis__us-gaap--ConstructionInProgressMember_zRNP9TiPcXw3" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
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  <tr id="xdx_407_eus-gaap--PropertyPlantAndEquipmentGross_iI_pn3n3_maPPAENzI8F_znZZYA4b0Jg7" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
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<span style="display: none;">v3.22.0.1</span><table class="report" border="0" cellspacing="2" id="idm140163246321512">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Leases (Tables)<br></strong></div></th>
<th class="th" colspan="1">9 Months Ended</th>
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<tr><th class="th"><div>Jan. 31, 2022</div></th></tr>
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<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_DisclosureLeasesAbstract', window );"><strong>Leases</strong></a></td>
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<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LeaseCostTableTextBlock', window );">Schedule of Operating Lease Costs</a></td>
<td class="text"><p id="xdx_89F_eus-gaap--LeaseCostTableTextBlock_zZrDl53ft1ud" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
components of lease expense in the Consolidated Statements of Operations for the three and nine months ended January 31, 2022 and 2021
were as follows:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;<span id="xdx_8BD_zCe6TVq7bgl2" style="display: none">Schedule of Operating Lease Costs</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
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<tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
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    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 12%; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">276</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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  <tr id="xdx_40F_eus-gaap--ShortTermLeaseCost_maLCzBwM_zqBdE4uVBEV2" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Short-term
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    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">12</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">7</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">22</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">12</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_409_eus-gaap--LeaseCost_iT_pn3n3_mtLCzBwM_zQVUYr6oRHti" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Total
    lease cost</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">104</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">298</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">250</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  </table>

<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_ScheduleOfRightofUseAssetsAndLeaseLiabilitiesTableTextBlock', window );">Schedule of Right-of Use Assets and Lease Liabilities</a></td>
<td class="text"><p id="xdx_896_ecustom--ScheduleOfRightofUseAssetsAndLeaseLiabilitiesTableTextBlock_ztFBYrfPIe9h" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Information
related to the Company&#8217;s right-of use assets and lease liabilities as of January 31, 2022 was as follows:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;<span id="xdx_8B8_zitTl4PqwDad" style="display: none">Schedule of Right-of Use Assets and Lease Liabilities</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" id="xdx_490_20220131_zAG3VTEOvvm3" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">January
    31, 2022</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(in
                                            thousands) </span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; text-decoration: underline; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Operating
    lease:</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_40C_eus-gaap--OperatingLeaseRightOfUseAsset_iI_pn3n3" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 80%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Operating
    right-of-use asset, net</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; width: 16%; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">825</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_40F_eus-gaap--OperatingLeaseLiabilityCurrent_iI_pn3n3_maOLLzIil_zpvnlDtVLio1" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; padding-left: 10pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Right-of-use
    liability- current</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">323</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_403_eus-gaap--OperatingLeaseLiabilityNoncurrent_iI_pn3n3_maOLLzIil_zCnU2SCKPiCa" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; padding-left: 10pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Right-of-use
    liability- long term</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">615</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_403_eus-gaap--OperatingLeaseLiability_iTI_pn3n3_mtOLLzIil_zQW5UrsDPMul" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Total
    lease liability</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">938</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Weighted
    average remaining lease term- operating leases</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_904_eus-gaap--OperatingLeaseWeightedAverageRemainingLeaseTerm1_iI_dtY_c20220131_zc9i0zCos5oh" title="Weighted average remaining lease term- operating leases">2.61</span>
                                            years</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Weighted
    average discount rate- operating leases</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_90B_eus-gaap--OperatingLeaseWeightedAverageDiscountRatePercent_iI_pid_dp_uPure_c20220131_zzxzmM87Mdeb" title="Weighted average discount rate- operating leases">8.2</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">%</span></td></tr>
  </table>

<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock', window );">Schedule of Future Minimum Lease Payments Under Operating Lease</a></td>
<td class="text"><p id="xdx_89F_eus-gaap--LesseeOperatingLeaseLiabilityMaturityTableTextBlock_zk1Cc1oYnOQ4" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Total
remaining lease payments under the Company&#8217;s operating leases are as follows:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;<span id="xdx_8B1_zWpYTmNFPUk9" style="display: none">Schedule of Future Minimum Lease Payments Under Operating Lease</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" id="xdx_493_20220131_zGKX5lWXUqu" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">January
    31, 2022</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(in
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    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
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  <tr id="xdx_40A_eus-gaap--LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_iI_pn3n3_maLOLLPzbOq_zKlMGr0PknV4" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">2023</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">391</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr id="xdx_401_eus-gaap--LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_iI_pn3n3_maLOLLPzbOq_zTCvMfPcgFi3" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
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  <tr id="xdx_403_eus-gaap--LesseeOperatingLeaseLiabilityPaymentsDueYearThree_iI_pn3n3_maLOLLPzbOq_ztcFDWbeWcF4" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
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  <tr id="xdx_401_eus-gaap--OperatingLeaseLiability_iI_pn3n3" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 50<br> -Paragraph 4<br> -URI http://asc.fasb.org/extlink&amp;oid=123408670&amp;loc=SL77918686-209980<br></p></div>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Tabular disclosure of undiscounted cash flows of lessee's operating lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to operating lease liability recognized in statement of financial position.</p></div>
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<span style="display: none;">v3.22.0.1</span><table class="report" border="0" cellspacing="2" id="idm140163162404696">
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<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Accrued Expenses (Tables)<br></strong></div></th>
<th class="th" colspan="1">9 Months Ended</th>
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<tr><th class="th"><div>Jan. 31, 2022</div></th></tr>
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<span style="display: none;">v3.22.0.1</span><table class="report" border="0" cellspacing="2" id="idm140163156139400">
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<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Share-Based Compensation (Tables)<br></strong></div></th>
<th class="th" colspan="1">9 Months Ended</th>
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<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
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    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="6" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Nine
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    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td id="xdx_983_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_pid_dp_uPure_c20210501__20220131__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zWTySAUWOzV7" style="font: 10pt Times New Roman, Times, Serif; text-align: right" title="Expected dividend yield"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span style="-sec-ix-hidden: xdx2ixbrl1367">&#8212;</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">%</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Expected
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    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_90E_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_pid_dp_uPure_c20210501__20220131__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_z6HtrJ1CpUp2" title="Expected volatility">121.9</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">%</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_906_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_pid_dp_uPure_c20200501__20210131__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zL99UmdIUMP1" title="Expected volatility">136.5</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">%</span></td></tr>
  </table>

<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ScheduleOfShareBasedCompensationActivityTableTextBlock', window );">Schedule of Stock Option Activity</a></td>
<td class="text"><p id="xdx_899_eus-gaap--ScheduleOfShareBasedCompensationActivityTableTextBlock_zNdOtyMulPaf" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">A
summary of stock options under our stock incentive plans is detailed in the following table.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;<span id="xdx_8B3_zIs0aCObVAve" style="display: none">Schedule of Stock Option Activity</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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                                            </b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Underlying
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    <td colspan="2" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Weighted</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Average</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Remaining</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Contractual</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Term</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(In
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  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
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    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_904_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_dtY_c20210501__20220131__us-gaap--AwardTypeAxis__custom--StockIncentivePlanMember_zalNpmAWqtF6" title="Weighted Average Remaining Contractual Term (In Years), Beginning">9.0</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Granted</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td id="xdx_980_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--StockIncentivePlanMember_zpk2SKgMqdof" style="font: 10pt Times New Roman, Times, Serif; text-align: right" title="Shares Underlying Options Outstanding, Granted"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">793,850</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td id="xdx_980_eus-gaap--ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--StockIncentivePlanMember_zaVeoxKQSUuc" style="font: 10pt Times New Roman, Times, Serif; text-align: right" title="Weighted Average Exercise Price, Granted"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">1.43</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Exercised</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td id="xdx_987_eus-gaap--StockIssuedDuringPeriodSharesStockOptionsExercised_iN_pid_di_c20210501__20220131__us-gaap--AwardTypeAxis__custom--StockIncentivePlanMember_zVEVDtjjACXf" style="font: 10pt Times New Roman, Times, Serif; text-align: right" title="Shares Underlying Options Outstanding, Exercised"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(44,332</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">)</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Expired</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td id="xdx_985_ecustom--StockIssuedDuringPeriodSharesStockOptionsExpired_iN_pid_di_c20210501__20220131__us-gaap--AwardTypeAxis__custom--StockIncentivePlanMember_zyUOaKcFuSQ3" style="font: 10pt Times New Roman, Times, Serif; text-align: right" title="Shares Underlying Options Outstanding, Expired"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(1,806</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">)</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
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    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td id="xdx_984_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod_iN_pid_di_c20210501__20220131__us-gaap--AwardTypeAxis__custom--StockIncentivePlanMember_zTEKDg1m29N9" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Shares Underlying Options Outstanding, Cancelled/forfeited"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(121,383</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">)</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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    <td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Outstanding
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    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td id="xdx_987_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_iE_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--StockIncentivePlanMember_znfZs9B7YiEe" style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Shares Underlying Options Outstanding, Ending"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">1,143,156</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
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    <td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_905_ecustom--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm_dtY_c20210501__20220131__us-gaap--AwardTypeAxis__custom--StockIncentivePlanMember_z386QtOBAAAk" title="Weighted Average Remaining Contractual Term (In Years), Ending">9.4</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Exercisable
    as of January 31, 2022</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td id="xdx_988_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_iI_pid_c20220131__us-gaap--AwardTypeAxis__custom--StockIncentivePlanMember_z9Ya0TtZtO6i" style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Shares Underlying Options Outstanding, Exercisable at Ending"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">308,481</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td id="xdx_989_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_iI_pid_c20220131__us-gaap--AwardTypeAxis__custom--StockIncentivePlanMember_zade9x7Yfja" style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: right" title="Weighted Average Exercise Price, Exercisable at Ending"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">4.59</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_907_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_dtY_c20210501__20220131__us-gaap--AwardTypeAxis__custom--StockIncentivePlanMember_zCvtrEkhkB66" title="Weighted Average Remaining Contractual Term (In Years), Exercisable at Ending">8.1</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  </table>

<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_ScheduleOfBusinessAcquisitionAndFairValueOfNetAssetsCompensationExpenseRecognized', window );">Schedule of Business Acquisition and Fair Value of Net Assets, Compensation Expense Recognized</a></td>
<td class="text"><p id="xdx_89E_ecustom--ScheduleOfBusinessAcquisitionAndFairValueOfNetAssetsCompensationExpenseRecognized_zu1LsraQHi47" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;<span id="xdx_8B7_zVIRlnvi8VIa" style="display: none">Schedule of Business Acquisition and Fair Value of Net Assets, Compensation Expense Recognized</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 80%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Fair
    Value of Purchase</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td id="xdx_985_ecustom--AdjustedFairValue_iI_pp0p0_c20210201__us-gaap--BusinessAcquisitionAxis__custom--ThreeDentAcquisitionMember_z1HaqeEVrnDl" style="font: 10pt Times New Roman, Times, Serif; width: 16%; text-align: right" title="Fair Value of Purchase"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">1,161,267</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Total
    Acquired Assets</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td id="xdx_988_eus-gaap--BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_iNI_pp0p0_di_c20210201__us-gaap--BusinessAcquisitionAxis__custom--ThreeDentAcquisitionMember_zwtrNIbtnlr" style="font: 10pt Times New Roman, Times, Serif; text-align: right" title="Total Acquired Assets"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(593,571</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">)</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Total
    Acquired Liabilities</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td id="xdx_980_eus-gaap--BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_c20210201__us-gaap--BusinessAcquisitionAxis__custom--ThreeDentAcquisitionMember_pp0p0" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Total Acquired Liabilities"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">117,106</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Compensation
    Expense</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td id="xdx_987_ecustom--BusinessComibinationCompensationExpensesRecognized_c20210201__us-gaap--BusinessAcquisitionAxis__custom--ThreeDentAcquisitionMember_pp0p0" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Compensation Expense"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">684,802</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Quarterly
    Compensation Expense</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td id="xdx_98F_ecustom--BusinessComibinationQuarterlyCompensationExpensesRecognized_c20210201__us-gaap--BusinessAcquisitionAxis__custom--ThreeDentAcquisitionMember_pp0p0" style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Quarterly Compensation Expense"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">171,201</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  </table>

<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityTableTextBlock', window );">Schedule of Non-vested Restricted Stock Activity</a></td>
<td class="text"><p id="xdx_893_eus-gaap--ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityTableTextBlock_zQuOLPwbSsAg" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">A
summary of non-vested restricted stock under our stock incentive plans is as follows:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;<span id="xdx_8B0_zvGSHaVa6s6a" style="display: none">Schedule of Non-vested Restricted Stock Activity</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Number</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"/> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>of
                                            Shares</b></span></p></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Weighted</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"/> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Average
                                            Price per</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"/> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Share</b></span></p></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 64%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Issued
    and unvested at April 30, 2021</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td id="xdx_983_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_iS_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_ze7Z2QDf8j2b" style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right" title="Number of Shares, Issued and unvested, Beginning"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">10,000</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td id="xdx_98F_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_iS_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_zoRAJ945JUeb" style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right" title="Weighted Average Price per Share, Issued and Unvested, Beginning"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">2.93</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Granted</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td id="xdx_98D_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_zRQBpF0rN3bk" style="font: 10pt Times New Roman, Times, Serif; text-align: right" title="Number of Shares, Granted"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">777,764</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td id="xdx_983_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_zGuHf0UmNwua" style="font: 10pt Times New Roman, Times, Serif; text-align: right" title="Weighted Average Price per Share, Granted"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">1.42</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Vested</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td id="xdx_98C_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_iN_pid_di_c20210501__20220131__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_zzacWTXXIQn2" style="font: 10pt Times New Roman, Times, Serif; text-align: right" title="Number of Shares, Vested"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(10,000</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">)</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td id="xdx_986_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_zQQYIdEqq0p4" style="font: 10pt Times New Roman, Times, Serif; text-align: right" title="Weighted Average Price per Share, Vested"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">2.93</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Cancelled/forfeited</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td id="xdx_981_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_zDeqjNnbT3si" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Number of Shares, Cancelled/forfeited"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span style="-sec-ix-hidden: xdx2ixbrl1515">&#8212;</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td id="xdx_980_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_zpLKFWhk7Rx9" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Weighted Average Price per Share, Cancelled/forfeited"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span style="-sec-ix-hidden: xdx2ixbrl1517">&#8212;</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Issued
    and unvested at January 31, 2022</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td id="xdx_980_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_iE_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_z6uC7agcOCD" style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Number of Shares, Issued and Unvested, Ending"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">777,764</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td id="xdx_982_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_iE_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_z3ZlSS1WJbF2" style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Weighted Average Price per Share, Issued and Unvested, Ending"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">1.42</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  </table>

<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AwardTypeAxis=OPTT_PerformanceStockOptionsMember', window );">Performance Stock Options [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems', window );"><strong>Share-based Compensation Arrangement by Share-based Payment Award [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ScheduleOfShareBasedCompensationActivityTableTextBlock', window );">Schedule of Stock Option Activity</a></td>
<td class="text"><p id="xdx_89C_eus-gaap--ScheduleOfShareBasedCompensationActivityTableTextBlock_hus-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zsBGn3sj6mZ3" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_8BB_zwlWRkSpuRQa" style="display: none">Schedule of Stock Option Activity</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Shares
                                            </b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Underlying
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    <td colspan="2" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Weighted</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Average</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Exercise</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Price</b></span></p></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Weighted</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Average</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Remaining</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Contractual</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Term</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(In
                                            Years)</b></span></p></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 45%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Outstanding
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    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_907_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_dtY_c20210501__20220131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zR57w3q9OVj" title="Weighted Average Remaining Contractual Term (In Years), Beginning">9.5</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Granted</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td id="xdx_981_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zbLr6999tpSj" style="font: 10pt Times New Roman, Times, Serif; text-align: right" title="Shares Underlying Options Outstanding, Granted"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">66,667</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td id="xdx_98A_eus-gaap--ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zAYnFuENvlW9" style="font: 10pt Times New Roman, Times, Serif; text-align: right" title="Weighted Average Exercise Price, Granted"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">0.62</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Exercised</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td id="xdx_981_eus-gaap--StockIssuedDuringPeriodSharesStockOptionsExercised_iN_pid_di_c20210501__20220131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zKN4XIWDSAMg" style="font: 10pt Times New Roman, Times, Serif; text-align: right" title="Shares Underlying Options Outstanding, Exercised"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(40,668</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">)</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td id="xdx_98F_eus-gaap--ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zO5LvWqHy7bd" style="font: 10pt Times New Roman, Times, Serif; text-align: right" title="Weighted Average Exercise Price, Exercised"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">1.05</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Cancelled/forfeited</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td id="xdx_981_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod_iN_pid_di_c20210501__20220131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zzC8R4uvYmF" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Shares Underlying Options Outstanding, Cancelled/forfeited"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">(220,766</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">)</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td id="xdx_981_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zKLpt4Sljkl1" style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt; text-align: right" title="Weighted Average Exercise Price, Cancelled/forfeited"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">2.58</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Outstanding
    as of January 31, 2022</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td id="xdx_98C_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_iE_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_z0YVn8VoTCR2" style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Shares Underlying Options Outstanding, Ending"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">230,023</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</span></td><td id="xdx_98F_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_iE_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zmjJERO74tbh" style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: right" title="Weighted Average Exercise Price, Ending Balance"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">2.26</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_908_ecustom--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm_dtY_c20210501__20220131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zgrPuzbbED14" title="Weighted Average Remaining Contractual Term (In Years), Ending">9.1</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Exercisable
    as of January 31, 2022</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td id="xdx_981_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_iI_pid_c20220131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zRwUilKWg8f6" style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Shares Underlying Options Outstanding, Exercisable at Ending"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span style="-sec-ix-hidden: xdx2ixbrl1487">&#8212;</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: right"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_904_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_dtY_c20210501__20220131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zYkatqvHiQX3" title="Weighted Average Remaining Contractual Term (In Years), Exercisable at Ending">0.0</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td></tr>
  </table>

<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_ScheduleOfBusinessAcquisitionAndFairValueOfNetAssetsCompensationExpenseRecognized">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Schedule of business acquisition and fair value of net assets compensation expense recognized [Table Text Block]</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_ScheduleOfBusinessAcquisitionAndFairValueOfNetAssetsCompensationExpenseRecognized</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dtr-types:textBlockItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
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<span style="display: none;">v3.22.0.1</span><table class="report" border="0" cellspacing="2" id="idm140163162394504">
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<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Fair Value Measurements (Tables)<br></strong></div></th>
<th class="th" colspan="1">9 Months Ended</th>
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<html>
<head>
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<span style="display: none;">v3.22.0.1</span><table class="report" border="0" cellspacing="2" id="idm140163162448520">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Business Combination (Tables)<br></strong></div></th>
<th class="th" colspan="1">9 Months Ended</th>
</tr>
<tr><th class="th"><div>Jan. 31, 2022</div></th></tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_BusinessCombinationAndAssetAcquisitionAbstract', window );"><strong>Business Combination and Asset Acquisition [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionContingentConsiderationTextBlock', window );">Schedule of Purchase Consideration</a></td>
<td class="text"><p id="xdx_892_eus-gaap--ScheduleOfBusinessAcquisitionsByAcquisitionContingentConsiderationTextBlock_zk0exgbolm37" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Purchase
consideration consisted of the following:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;<span id="xdx_8B7_zL6lB3OeLppl" style="display: none">Schedule
of Purchase Consideration</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 80%">
  <tr style="vertical-align: bottom">
    <td style="padding-bottom: 1pt">&#160;</td><td style="padding-bottom: 1pt">&#160;</td>
    <td colspan="2" style="border-bottom: Black 1pt solid; text-align: center">(in thousands)</td><td style="padding-bottom: 1pt">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="width: 78%">Cash</td><td style="width: 2%">&#160;</td>
    <td style="width: 1%; text-align: left">$</td><td id="xdx_987_eus-gaap--PaymentsToAcquireBusinessesGross_pn3n3_c20211114__20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvancedRoboticsIncMember_zAC7R75eClFk" style="width: 18%; text-align: right" title="Cash">4,000</td><td style="width: 1%; text-align: left">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td style="text-align: left">Liabilities assumed</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td id="xdx_98A_eus-gaap--BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_c20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvancedRoboticsIncMember_pn3n3" style="text-align: right" title="Liabilities assumed">456</td><td style="text-align: left">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td>Fair value of restricted shares</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td id="xdx_986_eus-gaap--BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_pn3n3_c20211114__20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvancedRoboticsIncMember_z2X9CcrrX7qg" style="text-align: right" title="Fair value of restricted shares">5,855</td><td style="text-align: left">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td style="padding-bottom: 1pt">Fair value of contingent consideration</td><td style="padding-bottom: 1pt">&#160;</td>
    <td style="border-bottom: Black 1pt solid; text-align: left">&#160;</td><td id="xdx_98C_eus-gaap--BusinessCombinationContingentConsiderationAsset_c20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvancedRoboticsIncMember_pn3n3" style="border-bottom: Black 1pt solid; text-align: right" title="Fair value of contingent consideration">1,591</td><td style="padding-bottom: 1pt; text-align: left">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="padding-bottom: 2.5pt; text-align: left">Total consideration</td><td style="padding-bottom: 2.5pt">&#160;</td>
    <td style="border-bottom: Black 2.5pt double; text-align: left">$</td><td id="xdx_98A_eus-gaap--BusinessCombinationConsiderationTransferred1_pn3n3_c20211114__20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvancedRoboticsIncMember_zjM5zKnEr232" style="border-bottom: Black 2.5pt double; text-align: right" title="Total consideration">11,902</td><td style="padding-bottom: 2.5pt; text-align: left">&#160;</td></tr>
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<span></span>
</td>
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<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedTableTextBlock', window );">Schedule of Allocated Fair Value of Purchase Consideration</a></td>
<td class="text"><p id="xdx_89F_eus-gaap--ScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedTableTextBlock_zA8Uzs4chd34" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
preliminary allocation of the fair value of the MAR acquisition is shown in the table below. The allocation of the fair value will be
finalized when the valuation is completed, and the differences will be trued up for the final allocated amounts, hence, actual results may differ from preliminary estimate.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_8BF_zbQMjUdwsWa7" style="display: none">Schedule
of Allocated Fair Value of Purchase Consideration</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 80%">
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    <td style="padding-bottom: 1pt; width: 78%; text-align: left">Total Purchase Consideration</td><td style="padding-bottom: 1pt; width: 2%">&#160;</td>
    <td style="border-bottom: Black 1pt solid; width: 1%; text-align: left">$</td><td id="xdx_98D_eus-gaap--BusinessCombinationConsiderationTransferred1_pn3n3_c20211114__20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvancedRoboticsIncMember_zX5kdPw2dvmj" style="border-bottom: Black 1pt solid; width: 18%; text-align: right" title="Total Purchase Consideration">11,902</td><td style="padding-bottom: 1pt; width: 1%; text-align: left">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td>&#160;</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td style="text-align: right">&#160;</td><td style="text-align: left">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td>Cash</td><td>&#160;</td>
    <td style="text-align: left">$</td><td id="xdx_981_eus-gaap--BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_iI_pn3n3_c20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvanceRoboticsIncMember_zNyZ5jprcmU5" style="text-align: right" title="Cash">12</td><td style="text-align: left">&#160;</td></tr>
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    <td>Inventory</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td id="xdx_98A_eus-gaap--BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory_iI_pn3n3_c20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvanceRoboticsIncMember_zG2baDro8uX7" style="text-align: right" title="Inventories">150</td><td style="text-align: left">&#160;</td></tr>
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    <td style="text-align: left">Property and equipment, net</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td id="xdx_983_eus-gaap--BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_iI_pn3n3_c20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvanceRoboticsIncMember_z9dooLl4Jy0l" style="text-align: right" title="Property and equipment, net">38</td><td style="text-align: left">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td>Trademarks</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td id="xdx_98D_eus-gaap--BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_iI_pn3n3_c20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvanceRoboticsIncMember__us-gaap--IndefiniteLivedIntangibleAssetsByMajorClassAxis__us-gaap--TradeNamesMember_z6L0E06lAlKe" style="text-align: right" title="Intangible assets">2,755</td><td style="text-align: left">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td>Patents</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td id="xdx_988_eus-gaap--BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_iI_pn3n3_c20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvanceRoboticsIncMember__us-gaap--FiniteLivedIntangibleAssetsByMajorClassAxis__us-gaap--PatentsMember_zlRkOjeJ1Hye" style="text-align: right" title="Intangible assets">1,193</td><td style="text-align: left">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td style="padding-bottom: 1pt">Goodwill</td><td style="padding-bottom: 1pt">&#160;</td>
    <td style="border-bottom: Black 1pt solid; text-align: left">&#160;</td><td id="xdx_985_eus-gaap--Goodwill_iI_pn3n3_c20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvanceRoboticsIncMember_zuYmZv3w8ON5" style="border-bottom: Black 1pt solid; text-align: right" title="Goodwill">7,754</td><td style="padding-bottom: 1pt; text-align: left">&#160;</td></tr>
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    <td style="padding-bottom: 2.5pt; text-align: left">Net assets acquired</td><td style="padding-bottom: 2.5pt">&#160;</td>
    <td style="border-bottom: Black 2.5pt double; text-align: left">$</td><td id="xdx_989_eus-gaap--BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_iI_pn3n3_c20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvanceRoboticsIncMember_zxM5Z3nCk0C2" style="border-bottom: Black 2.5pt double; text-align: right" title="Net assets acquired">11,902</td><td style="padding-bottom: 2.5pt; text-align: left">&#160;</td></tr>
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<span></span>
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<TEXT>
<html>
<head>
<title></title>
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<script type="text/javascript" src="Show.js">/* Do Not Remove This Comment */</script><script type="text/javascript">
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<span style="display: none;">v3.22.0.1</span><table class="report" border="0" cellspacing="2" id="idm140163153834504">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Background, Basis of Presentation and Liquidity (Details Narrative) - USD ($)<br> $ / shares in Units, $ in Thousands</strong></div></th>
<th class="th" colspan="1"></th>
<th class="th" colspan="1"></th>
<th class="th" colspan="1"></th>
<th class="th" colspan="1"></th>
<th class="th" colspan="1"></th>
<th class="th" colspan="1"></th>
<th class="th" colspan="1"></th>
<th class="th" colspan="1"></th>
<th class="th" colspan="2">3 Months Ended</th>
<th class="th" colspan="2">9 Months Ended</th>
<th class="th" colspan="1">12 Months Ended</th>
<th class="th" colspan="1"></th>
<th class="th" colspan="1"></th>
</tr>
<tr>
<th class="th"><div>Jan. 31, 2022</div></th>
<th class="th"><div>Jul. 31, 2021</div></th>
<th class="th"><div>Dec. 23, 2020</div></th>
<th class="th"><div>Nov. 20, 2020</div></th>
<th class="th"><div>Sep. 18, 2020</div></th>
<th class="th"><div>Oct. 24, 2019</div></th>
<th class="th"><div>Apr. 08, 2019</div></th>
<th class="th"><div>Jan. 07, 2019</div></th>
<th class="th"><div>Jan. 31, 2022</div></th>
<th class="th"><div>Jan. 31, 2021</div></th>
<th class="th"><div>Jan. 31, 2022</div></th>
<th class="th"><div>Jan. 31, 2021</div></th>
<th class="th"><div>Apr. 30, 2021</div></th>
<th class="th"><div>Oct. 31, 2021</div></th>
<th class="th"><div>Jul. 01, 2019</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_NetIncomeLoss', window );">Net loss</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 5,471<span></span>
</td>
<td class="nump">$ 3,151<span></span>
</td>
<td class="nump">$ 13,721<span></span>
</td>
<td class="nump">$ 9,560<span></span>
</td>
<td class="nump">$ 14,800<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_NetCashProvidedByUsedInOperatingActivities', window );">Net cash in operating activities</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">15,787<span></span>
</td>
<td class="nump">8,525<span></span>
</td>
<td class="nump">$ 11,700<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_Cash', window );">Cash</a></td>
<td class="nump">$ 63,500<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 63,500<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">63,500<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
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<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">$ 66,166<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction', window );">Number of common stock shares sold</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">1,542,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_DeferredOfferingCosts', window );">Deferred Offering Costs</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 100,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_LegalEntityAxis=OPTT_AGPAllianceGlobalPartnersMember', window );">A.G.P Alliance Global Partners [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction', window );">Number of common stock shares sold</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">12,342,506<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SaleOfStockConsiderationReceivedPerTransaction', window );">Proceeds from issuance or sale of equity, net of issuance costs</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 18,700<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SaleOfStockPricePerShare', window );">Combined purchase price per share</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 1.51<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TypeOfArrangementAxis=OPTT_TwoThousandNinteenATMFacilityMember', window );">2019 ATM Facility [Member] | A.G.P Alliance Global Partners [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ProceedsFromIssuanceInitialPublicOffering', window );">Proceeds from initial public offering</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 25,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction', window );">Number of common stock shares sold</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">17,595,472<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SaleOfStockConsiderationReceivedPerTransaction', window );">Proceeds from issuance or sale of equity, net of issuance costs</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 23,400<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SaleOfStockPricePerShare', window );">Combined purchase price per share</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 1.33<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_PaymentOfSalesCommission', window );">Payment of sales commission</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 800<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TypeOfArrangementAxis=OPTT_TwoThousandTwentyATMFacilityMember', window );">2020 ATM Facility [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SaleOfStockConsiderationReceivedPerTransaction', window );">Proceeds from issuance or sale of equity, net of issuance costs</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">75,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_PaymentOfSalesCommission', window );">Payment of sales commission</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 25,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TypeOfArrangementAxis=OPTT_TwoThousandTwentyATMFacilityMember', window );">2020 ATM Facility [Member] | A.G.P Alliance Global Partners [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction', window );">Number of common stock shares sold</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">17,179,883<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SaleOfStockConsiderationReceivedPerTransaction', window );">Proceeds from issuance or sale of equity, net of issuance costs</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 50,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SaleOfStockPricePerShare', window );">Combined purchase price per share</a></td>
<td class="nump">$ 2.91<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 2.91<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 2.91<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_PaymentOfSalesCommission', window );">Payment of sales commission</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 1,600<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_ProceedsFromInitialPublicOffering', window );">Proceeds from initial public offering</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 50,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TypeOfArrangementAxis=OPTT_StockPurchaseAgreementMember', window );">Stock Purchase Agreement [Member] | Aspire Capital Fund, LLC [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction', window );">Number of common stock shares sold</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">3,722,251<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">6,424,205<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SaleOfStockConsiderationReceivedPerTransaction', window );">Proceeds from issuance or sale of equity, net of issuance costs</a></td>
<td class="nump">$ 1,000<span></span>
</td>
<td class="nump">$ 11,800<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 4,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SaleOfStockPricePerShare', window );">Combined purchase price per share</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 0.63<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 3.17<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_StockIssuedDuringPeriodValueIssuedForCommitmentFee', window );">Aggregate purchase of common stock</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 12,500<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_PercentageOfOutstandingCommonStockLimitForShareholderApproval', window );">Percentage of outstanding common stock</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">19.99%<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">19.99%<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_StockIssuedDuringPeriodSharesCanBeIssuedBasedUponOutstandingPercentage', window );">Shares can be issued based upon outstanding percentage</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">3,722,251<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_NumberOfAdditionalSharesThatCanBeIssuedUponShareholderApproval', window );">Additional sales of common stock shares sold</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">9,864,706<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TypeOfArrangementAxis=OPTT_StockPurchaseAgreementMember', window );">Stock Purchase Agreement [Member] | Aspire Capital Fund, LLC [Member] | Maximum [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_StockIssuedDuringPeriodValueIssuedForCommitmentFee', window );">Aggregate purchase of common stock</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 10,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TypeOfArrangementAxis=OPTT_StockPurchaseAgreementOneMember', window );">Stock Purchase Agreement One [Member] | Aspire Capital Fund, LLC [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction', window );">Number of common stock shares sold</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">5,025,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SaleOfStockConsiderationReceivedPerTransaction', window );">Proceeds from issuance or sale of equity, net of issuance costs</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 2,900<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SaleOfStockPricePerShare', window );">Combined purchase price per share</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 0.57<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_NumberOfAdditionalSharesThatCanBeIssuedUponShareholderApproval">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Number of additional shares that can be issued upon shareholder approval.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_NumberOfAdditionalSharesThatCanBeIssuedUponShareholderApproval</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_PaymentOfSalesCommission">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Payment of sales commission.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_PaymentOfSalesCommission</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_PercentageOfOutstandingCommonStockLimitForShareholderApproval">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Percentage of outstanding common stock limit for shareholder approval.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_PercentageOfOutstandingCommonStockLimitForShareholderApproval</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dtr-types:percentItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_ProceedsFromInitialPublicOffering">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The cash inflow associated with the amount received from entity's first offering of stock to the public.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_ProceedsFromInitialPublicOffering</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_StockIssuedDuringPeriodSharesCanBeIssuedBasedUponOutstandingPercentage">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Number of shares can be issued based upon outstanding percentage.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_StockIssuedDuringPeriodSharesCanBeIssuedBasedUponOutstandingPercentage</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_StockIssuedDuringPeriodValueIssuedForCommitmentFee">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Aggregate purchase of common stock.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_StockIssuedDuringPeriodValueIssuedForCommitmentFee</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_Cash">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 946<br> -SubTopic 210<br> -Section 45<br> -Paragraph 20<br> -URI http://asc.fasb.org/extlink&amp;oid=118262064&amp;loc=SL116631418-115840<br><br>Reference 2: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 852<br> -SubTopic 10<br> -Section 55<br> -Paragraph 10<br> -URI http://asc.fasb.org/extlink&amp;oid=84165509&amp;loc=d3e56426-112766<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.1)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 4: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 946<br> -SubTopic 210<br> -Section 45<br> -Paragraph 21<br> -URI http://asc.fasb.org/extlink&amp;oid=118262064&amp;loc=SL116631419-115840<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_Cash</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_DeferredOfferingCosts">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Specific incremental costs directly attributable to a proposed or actual offering of securities which are deferred at the end of the reporting period.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.8)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 340<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SAB Topic 5.A)<br> -URI http://asc.fasb.org/extlink&amp;oid=122040515&amp;loc=d3e105025-122735<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_DeferredOfferingCosts</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_NetCashProvidedByUsedInOperatingActivities">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 25<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3536-108585<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 24<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3521-108585<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 28<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3602-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_NetCashProvidedByUsedInOperatingActivities</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_NetIncomeLoss">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 942<br> -SubTopic 220<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.9-04(22))<br> -URI http://asc.fasb.org/extlink&amp;oid=120399700&amp;loc=SL114874048-224260<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 32<br> -Subparagraph (f)<br> -URI http://asc.fasb.org/extlink&amp;oid=123359005&amp;loc=d3e8933-108599<br><br>Reference 3: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 250<br> -SubTopic 10<br> -Section 50<br> -Paragraph 4<br> -URI 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Codification<br> -Topic 250<br> -SubTopic 10<br> -Section 50<br> -Paragraph 1<br> -Subparagraph (b)(2)<br> -URI http://asc.fasb.org/extlink&amp;oid=124431687&amp;loc=d3e22499-107794<br><br>Reference 11: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1A<br> -Subparagraph (SX 210.13-01(a)(4)(iv))<br> -URI http://asc.fasb.org/extlink&amp;oid=124359900&amp;loc=SL124442526-122756<br><br>Reference 12: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1A<br> -Subparagraph (SX 210.13-01(a)(4)(iii)(A))<br> -URI http://asc.fasb.org/extlink&amp;oid=124359900&amp;loc=SL124442526-122756<br><br>Reference 13: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1B<br> -Subparagraph (SX 210.13-02(a)(4)(i))<br> -URI http://asc.fasb.org/extlink&amp;oid=124359900&amp;loc=SL124442552-122756<br><br>Reference 14: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1A<br> -Subparagraph (SX 210.13-01(a)(4)(i))<br> -URI http://asc.fasb.org/extlink&amp;oid=124359900&amp;loc=SL124442526-122756<br><br>Reference 15: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 250<br> -SubTopic 10<br> -Section 50<br> -Paragraph 9<br> -URI http://asc.fasb.org/extlink&amp;oid=124431687&amp;loc=d3e22663-107794<br><br>Reference 16: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1B<br> -Subparagraph (SX 210.13-02(a)(4)(iv))<br> -URI 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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_NetIncomeLoss</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The cash inflow associated with the amount received from entity's first offering of stock to the public.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 14<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3255-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ProceedsFromIssuanceInitialPublicOffering</td>
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<td>duration</td>
</tr>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_SaleOfStockConsiderationReceivedPerTransaction">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of consideration received by subsidiary or equity investee in exchange for shares of stock issued or sold. Includes amount of cash received, fair value of noncash assets received, and fair value of liabilities assumed by the investor.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_SaleOfStockConsiderationReceivedPerTransaction</td>
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<tr>
<td><strong> Period Type:</strong></td>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction</td>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_SaleOfStockPricePerShare">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_SaleOfStockPricePerShare</td>
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<td><strong> Period Type:</strong></td>
<td>instant</td>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
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<td><strong> Name:</strong></td>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_TypeOfArrangementAxis=OPTT_TwoThousandNinteenATMFacilityMember</td>
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<tr>
<td><strong> Name:</strong></td>
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<td><strong> Name:</strong></td>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
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<span style="display: none;">v3.22.0.1</span><table class="report" border="0" cellspacing="2" id="idm140163156108680">
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<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Schedule of Cash and Cash Equivalents (Details) - USD ($)<br> $ in Thousands</strong></div></th>
<th class="th"><div>Jan. 31, 2022</div></th>
<th class="th"><div>Apr. 30, 2021</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CashAndCashEquivalentsLineItems', window );"><strong>Cash and Cash Equivalents [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
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<td class="nump">$ 63,454<span></span>
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<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CashAndCashEquivalentsAxis=OPTT_CheckingAndSavingsAccountsMember', window );">Checking and Savings Accounts [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
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<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CashAndCashEquivalentsLineItems', window );"><strong>Cash and Cash Equivalents [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
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<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CashAndCashEquivalentsAtCarryingValue', window );">Cash and cash equivalents</a></td>
<td class="nump">1,519<span></span>
</td>
<td class="nump">1,850<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CashAndCashEquivalentsAxis=us-gaap_MoneyMarketFundsMember', window );">Money Market Funds [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CashAndCashEquivalentsLineItems', window );"><strong>Cash and Cash Equivalents [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CashAndCashEquivalentsAtCarryingValue', window );">Cash and cash equivalents</a></td>
<td class="nump">$ 61,935<span></span>
</td>
<td class="nump">$ 81,178<span></span>
</td>
</tr>
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<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_CashAndCashEquivalentsAtCarryingValue">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 4<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3044-108585<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section 45<br> -Paragraph 1<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=124098289&amp;loc=d3e6676-107765<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.1)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_CashAndCashEquivalentsAtCarryingValue</td>
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<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
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<tr>
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<span style="display: none;">v3.22.0.1</span><table class="report" border="0" cellspacing="2" id="idm140163161846184">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Schedule of Cash and Cash Equivalents and Restricted Cash (Details) - USD ($)<br> $ in Thousands</strong></div></th>
<th class="th"><div>Jan. 31, 2022</div></th>
<th class="th"><div>Apr. 30, 2021</div></th>
</tr>
<tr class="re">
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<td class="text">&#160;<span></span>
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<td class="text">&#160;<span></span>
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<tr class="ro">
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<td class="nump">$ 63,454<span></span>
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<td class="nump">$ 83,028<span></span>
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<tr class="re">
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<td class="nump">384<span></span>
</td>
<td class="nump">384<span></span>
</td>
</tr>
<tr class="ro">
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<td class="nump">222<span></span>
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<td class="nump">222<span></span>
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<td class="nump">$ 64,060<span></span>
</td>
<td class="nump">$ 83,634<span></span>
</td>
</tr>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 4<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3044-108585<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section 45<br> -Paragraph 1<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=124098289&amp;loc=d3e6676-107765<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.1)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 24<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3521-108585<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 4<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3044-108585<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 50<br> -Paragraph 8<br> -URI http://asc.fasb.org/extlink&amp;oid=123431023&amp;loc=SL98516268-108586<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of cash restricted as to withdrawal or usage, classified as current. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 50<br> -Paragraph 8<br> -URI http://asc.fasb.org/extlink&amp;oid=123431023&amp;loc=SL98516268-108586<br><br>Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(1))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section 45<br> -Paragraph 1<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=124098289&amp;loc=d3e6676-107765<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
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<td style="white-space:nowrap;">us-gaap_RestrictedCashCurrent</td>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of cash restricted as to withdrawal or usage, classified as noncurrent. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section 45<br> -Paragraph 4<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=124098289&amp;loc=d3e6812-107765<br><br>Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(17))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 50<br> -Paragraph 8<br> -URI http://asc.fasb.org/extlink&amp;oid=123431023&amp;loc=SL98516268-108586<br><br>Reference 4: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 954<br> -SubTopic 210<br> -Section 45<br> -Paragraph 5<br> -URI http://asc.fasb.org/extlink&amp;oid=120413173&amp;loc=SL116631458-115580<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
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<span style="display: none;">v3.22.0.1</span><table class="report" border="0" cellspacing="2" id="idm140163153625192">
<tr>
<th class="tl" colspan="2" rowspan="2"><div style="width: 200px;"><strong>Schedule of Revenue by Major Customers by Reporting Segments (Details) - USD ($)<br> $ in Thousands</strong></div></th>
<th class="th" colspan="2">3 Months Ended</th>
<th class="th" colspan="2">9 Months Ended</th>
</tr>
<tr>
<th class="th"><div>Jan. 31, 2022</div></th>
<th class="th"><div>Jan. 31, 2021</div></th>
<th class="th"><div>Jan. 31, 2022</div></th>
<th class="th"><div>Jan. 31, 2021</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ProductInformationLineItems', window );"><strong>Product Information [Line Items]</strong></a></td>
<td class="th" style="border-bottom: 0px;"><sup></sup></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
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<td class="th" style="border-bottom: 0px;"><sup></sup></td>
<td class="nump">$ 484<span></span>
</td>
<td class="nump">$ 317<span></span>
</td>
<td class="nump">$ 1,003<span></span>
</td>
<td class="nump">$ 604<span></span>
</td>
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<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_SalesRevenueNetMember', window );">Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Eni S.p.A [Member]</a></td>
<td class="th" style="border-bottom: 0px;"><sup></sup></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ProductInformationLineItems', window );"><strong>Product Information [Line Items]</strong></a></td>
<td class="th" style="border-bottom: 0px;"><sup></sup></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax', window );">Revenues</a></td>
<td class="th" style="border-bottom: 0px;"><sup></sup></td>
<td class="text"> <span></span>
</td>
<td class="nump">34<span></span>
</td>
<td class="nump">14<span></span>
</td>
<td class="nump">135<span></span>
</td>
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<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_SalesRevenueNetMember', window );">Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Department of Energy [Member]</a></td>
<td class="th" style="border-bottom: 0px;"><sup></sup></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ProductInformationLineItems', window );"><strong>Product Information [Line Items]</strong></a></td>
<td class="th" style="border-bottom: 0px;"><sup></sup></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax', window );">Revenues</a></td>
<td class="th" style="border-bottom: 0px;"><sup></sup></td>
<td class="nump">102<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">182<span></span>
</td>
<td class="text"> <span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_SalesRevenueNetMember', window );">Revenue Benchmark [Member] | Customer Concentration Risk [Member] | EGP [Member]</a></td>
<td class="th" style="border-bottom: 0px;"><sup></sup></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ProductInformationLineItems', window );"><strong>Product Information [Line Items]</strong></a></td>
<td class="th" style="border-bottom: 0px;"><sup></sup></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax', window );">Revenues</a></td>
<td class="th" style="border-bottom: 0px;"><sup></sup></td>
<td class="text"> <span></span>
</td>
<td class="nump">223<span></span>
</td>
<td class="nump">163<span></span>
</td>
<td class="nump">379<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_SalesRevenueNetMember', window );">Revenue Benchmark [Member] | Customer Concentration Risk [Member] | ACET [Member]</a></td>
<td class="th" style="border-bottom: 0px;"><sup></sup></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ProductInformationLineItems', window );"><strong>Product Information [Line Items]</strong></a></td>
<td class="th" style="border-bottom: 0px;"><sup></sup></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax', window );">Revenues</a></td>
<td class="th" style="border-bottom: 0px;"><sup></sup></td>
<td class="text"> <span></span>
</td>
<td class="nump">33<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">37<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_SalesRevenueNetMember', window );">Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Valaris FNI [Member]</a></td>
<td class="th" style="border-bottom: 0px;"><sup></sup></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ProductInformationLineItems', window );"><strong>Product Information [Line Items]</strong></a></td>
<td class="th" style="border-bottom: 0px;"><sup></sup></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax', window );">Revenues</a></td>
<td class="th" style="border-bottom: 0px;"><sup>[1]</sup></td>
<td class="nump">7<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">142<span></span>
</td>
<td class="text"> <span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_SalesRevenueNetMember', window );">Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Brigham Young University [Member]</a></td>
<td class="th" style="border-bottom: 0px;"><sup></sup></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ProductInformationLineItems', window );"><strong>Product Information [Line Items]</strong></a></td>
<td class="th" style="border-bottom: 0px;"><sup></sup></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax', window );">Revenues</a></td>
<td class="th" style="border-bottom: 0px;"><sup></sup></td>
<td class="nump">66<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">66<span></span>
</td>
<td class="text"> <span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_SalesRevenueNetMember', window );">Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Nippon Kaiyo [Member]</a></td>
<td class="th" style="border-bottom: 0px;"><sup></sup></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ProductInformationLineItems', window );"><strong>Product Information [Line Items]</strong></a></td>
<td class="th" style="border-bottom: 0px;"><sup></sup></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax', window );">Revenues</a></td>
<td class="th" style="border-bottom: 0px;"><sup>[2]</sup></td>
<td class="nump">78<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">78<span></span>
</td>
<td class="text"> <span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_SalesRevenueNetMember', window );">Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Naval Surface Warfare Center [Member]</a></td>
<td class="th" style="border-bottom: 0px;"><sup></sup></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ProductInformationLineItems', window );"><strong>Product Information [Line Items]</strong></a></td>
<td class="th" style="border-bottom: 0px;"><sup></sup></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax', window );">Revenues</a></td>
<td class="th" style="border-bottom: 0px;"><sup>[2]</sup></td>
<td class="nump">98<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">98<span></span>
</td>
<td class="text"> <span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_SalesRevenueNetMember', window );">Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Other [Member]</a></td>
<td class="th" style="border-bottom: 0px;"><sup></sup></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ProductInformationLineItems', window );"><strong>Product Information [Line Items]</strong></a></td>
<td class="th" style="border-bottom: 0px;"><sup></sup></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax', window );">Revenues</a></td>
<td class="th" style="border-bottom: 0px;"><sup></sup></td>
<td class="nump">$ 133<span></span>
</td>
<td class="nump">$ 27<span></span>
</td>
<td class="nump">$ 260<span></span>
</td>
<td class="nump">$ 53<span></span>
</td>
</tr>
<tr><td colspan="5"></td></tr>
<tr><td colspan="5"><table class="outerFootnotes" width="100%">
<tr class="outerFootnote">
<td style="vertical-align: top; width: 12pt;" valign="top">[1]</td>
<td style="vertical-align: top;" valign="top">3Dent
    related consulting</td>
</tr>
<tr class="outerFootnote">
<td style="vertical-align: top; width: 12pt;" valign="top">[2]</td>
<td style="vertical-align: top;" valign="top">MAR
    related sales</td>
</tr>
</table></td></tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ProductInformationLineItems">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 30<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123359005&amp;loc=d3e8906-108599<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 40<br> -URI http://asc.fasb.org/extlink&amp;oid=123359005&amp;loc=d3e9031-108599<br><br>Reference 3: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 41<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123359005&amp;loc=d3e9038-108599<br><br>Reference 4: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 32<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=123359005&amp;loc=d3e8933-108599<br><br>Reference 5: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 32<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123359005&amp;loc=d3e8933-108599<br><br>Reference 6: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 606<br> -SubTopic 10<br> -Section 50<br> -Paragraph 4<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123351226&amp;loc=SL49130543-203045<br><br>Reference 7: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 22<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=123359005&amp;loc=d3e8736-108599<br><br>Reference 8: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 22<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123359005&amp;loc=d3e8736-108599<br><br>Reference 9: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 42<br> -URI http://asc.fasb.org/extlink&amp;oid=123359005&amp;loc=d3e9054-108599<br><br>Reference 10: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 606<br> -SubTopic 10<br> -Section 50<br> -Paragraph 5<br> -URI http://asc.fasb.org/extlink&amp;oid=123351226&amp;loc=SL49130545-203045<br><br>Reference 11: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 924<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SAB Topic 11.L)<br> -URI http://asc.fasb.org/extlink&amp;oid=6472922&amp;loc=d3e499488-122856<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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</tr>
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<td><strong> Data Type:</strong></td>
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</tr>
<tr>
<td><strong> Balance Type:</strong></td>
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<td><strong> Period Type:</strong></td>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_SalesRevenueNetMember</td>
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<td><strong> Period Type:</strong></td>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ConcentrationRiskByTypeAxis=us-gaap_CustomerConcentrationRiskMember</td>
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<td><strong> Data Type:</strong></td>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">srt_MajorCustomersAxis=OPTT_EniSPAMember</td>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">srt_MajorCustomersAxis=OPTT_DepartmentOfEnergyMember</td>
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<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<td><strong> Balance Type:</strong></td>
<td></td>
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<td><strong> Period Type:</strong></td>
<td></td>
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</table></div>
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</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_srt_MajorCustomersAxis=OPTT_EGPMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">srt_MajorCustomersAxis=OPTT_EGPMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_srt_MajorCustomersAxis=OPTT_ACETMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">srt_MajorCustomersAxis=OPTT_ACETMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_srt_MajorCustomersAxis=OPTT_ValarisFNIMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">srt_MajorCustomersAxis=OPTT_ValarisFNIMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_srt_MajorCustomersAxis=OPTT_BrighamYoungUniversityMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">srt_MajorCustomersAxis=OPTT_BrighamYoungUniversityMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_srt_MajorCustomersAxis=OPTT_NipponKaiyoMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">srt_MajorCustomersAxis=OPTT_NipponKaiyoMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_srt_MajorCustomersAxis=OPTT_NavalSurfaceWarfareCenterMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">srt_MajorCustomersAxis=OPTT_NavalSurfaceWarfareCenterMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_srt_MajorCustomersAxis=OPTT_OtherMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">srt_MajorCustomersAxis=OPTT_OtherMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
</div>
</body>
</html>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>XML
<SEQUENCE>51
<FILENAME>R41.htm
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
<html>
<head>
<title></title>
<link rel="stylesheet" type="text/css" href="report.css">
<script type="text/javascript" src="Show.js">/* Do Not Remove This Comment */</script><script type="text/javascript">
							function toggleNextSibling (e) {
							if (e.nextSibling.style.display=='none') {
							e.nextSibling.style.display='block';
							} else { e.nextSibling.style.display='none'; }
							}</script>
</head>
<body>
<span style="display: none;">v3.22.0.1</span><table class="report" border="0" cellspacing="2" id="idm140163156117304">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs (Details) - USD ($)<br> $ in Thousands</strong></div></th>
<th class="th" colspan="2">3 Months Ended</th>
<th class="th" colspan="2">9 Months Ended</th>
</tr>
<tr>
<th class="th"><div>Jan. 31, 2022</div></th>
<th class="th"><div>Jan. 31, 2021</div></th>
<th class="th"><div>Jan. 31, 2022</div></th>
<th class="th"><div>Jan. 31, 2021</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensation', window );">Total share-based compensation expense</a></td>
<td class="nump">$ 317<span></span>
</td>
<td class="nump">$ 115<span></span>
</td>
<td class="nump">$ 864<span></span>
</td>
<td class="nump">$ 338<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_IncomeStatementLocationAxis=OPTT_EngineeringAndProductDevelopmentMember', window );">Engineering and Product Development [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensation', window );">Total share-based compensation expense</a></td>
<td class="nump">209<span></span>
</td>
<td class="nump">32<span></span>
</td>
<td class="nump">551<span></span>
</td>
<td class="nump">91<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_IncomeStatementLocationAxis=us-gaap_SellingGeneralAndAdministrativeExpensesMember', window );">Selling, General and Administrative Expenses [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensation', window );">Total share-based compensation expense</a></td>
<td class="nump">$ 108<span></span>
</td>
<td class="nump">$ 83<span></span>
</td>
<td class="nump">$ 313<span></span>
</td>
<td class="nump">$ 247<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensation">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of noncash expense for share-based payment arrangement.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 28<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3602-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensation</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_IncomeStatementLocationAxis=OPTT_EngineeringAndProductDevelopmentMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_IncomeStatementLocationAxis=OPTT_EngineeringAndProductDevelopmentMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_IncomeStatementLocationAxis=us-gaap_SellingGeneralAndAdministrativeExpensesMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_IncomeStatementLocationAxis=us-gaap_SellingGeneralAndAdministrativeExpensesMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
</div>
</body>
</html>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>XML
<SEQUENCE>52
<FILENAME>R42.htm
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
<html>
<head>
<title></title>
<link rel="stylesheet" type="text/css" href="report.css">
<script type="text/javascript" src="Show.js">/* Do Not Remove This Comment */</script><script type="text/javascript">
							function toggleNextSibling (e) {
							if (e.nextSibling.style.display=='none') {
							e.nextSibling.style.display='block';
							} else { e.nextSibling.style.display='none'; }
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</head>
<body>
<span style="display: none;">v3.22.0.1</span><table class="report" border="0" cellspacing="2" id="idm140163153906952">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Summary of Significant Accounting Policies (Details Narrative) - USD ($)<br></strong></div></th>
<th class="th" colspan="2">9 Months Ended</th>
<th class="th" colspan="1"></th>
<th class="th" colspan="1"></th>
</tr>
<tr>
<th class="th"><div>Jan. 31, 2022</div></th>
<th class="th"><div>Jan. 31, 2021</div></th>
<th class="th"><div>Apr. 30, 2021</div></th>
<th class="th"><div>Aug. 31, 2020</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems', window );"><strong>Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CashAndCashEquivalentsAtCarryingValue', window );">Cash and Cash Equivalents, at Carrying Value</a></td>
<td class="nump">$ 63,454,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 83,028,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_RevenueRemainingPerformanceObligation', window );">Revenue remaining performance obligation</a></td>
<td class="nump">$ 800,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_RevenueRemainingPerformancesObligationPercentage', window );">Revenue remaining performance obligation, percentage</a></td>
<td class="nump">100.00%<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount', window );">Antidilutive securities excluded from computation of earnings per share, amount</a></td>
<td class="nump">6,356,123<span></span>
</td>
<td class="nump">5,221,258<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis=OPTT_SantanderBankMember', window );">Santander Bank [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems', window );"><strong>Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_LettersOfCreditIssuedAmount', window );">Letters of credit issued amount</a></td>
<td class="nump">$ 64,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis=OPTT_SantanderBankMember', window );">Santander Bank [Member] | Letter 2 [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems', window );"><strong>Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_LettersOfCreditIssuedAmount', window );">Letters of credit issued amount</a></td>
<td class="nump">259,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis=OPTT_SantanderBankMember', window );">Santander Bank [Member] | Letter 2 [Member] | August 2020 [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems', window );"><strong>Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LettersOfCreditOutstandingAmount', window );">Letters of Credit Outstanding, Amount</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 323,000<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis=OPTT_ForeignFinancialInstitutionsMember', window );">Foreign Financial Institutions [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems', window );"><strong>Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CashAndCashEquivalentsAtCarryingValue', window );">Cash and Cash Equivalents, at Carrying Value</a></td>
<td class="nump">30,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TypeOfArrangementAxis=OPTT_RestrictedCashAndSecurityAgreementsMember', window );">Restricted Cash and Security Agreements [Member] | Santander Bank [Member] | Letter of Credit [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems', window );"><strong>Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_Deposits', window );">Deposits</a></td>
<td class="nump">157,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TypeOfArrangementAxis=OPTT_RestrictedCashAndSecurityAgreementsMember', window );">Restricted Cash and Security Agreements [Member] | Santander Bank [Member] | Letter 1 [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems', window );"><strong>Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LettersOfCreditOutstandingAmount', window );">Letters of Credit Outstanding, Amount</a></td>
<td class="nump">126,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TypeOfArrangementAxis=OPTT_RestrictedCashAndSecurityAgreementsMember', window );">Restricted Cash and Security Agreements [Member] | Santander Bank [Member] | Letter 2 [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems', window );"><strong>Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LettersOfCreditOutstandingAmount', window );">Letters of Credit Outstanding, Amount</a></td>
<td class="nump">$ 645,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_LettersOfCreditIssuedAmount">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Letters of credit issued, amount.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_LettersOfCreditIssuedAmount</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_RevenueRemainingPerformancesObligationPercentage">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Percentage of remaining performance obligation to total remaining performance obligation not recognized as revenue.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_RevenueRemainingPerformancesObligationPercentage</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dtr-types:percentItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 260<br> -SubTopic 10<br> -Section 50<br> -Paragraph 1<br> -Subparagraph (c)<br> -URI http://asc.fasb.org/extlink&amp;oid=124432515&amp;loc=d3e3550-109257<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_CashAndCashEquivalentsAtCarryingValue">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 4<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3044-108585<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section 45<br> -Paragraph 1<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=124098289&amp;loc=d3e6676-107765<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.1)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_CashAndCashEquivalentsAtCarryingValue</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_Deposits">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 942<br> -SubTopic 210<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.9-03.12)<br> -URI http://asc.fasb.org/extlink&amp;oid=120398452&amp;loc=d3e534808-122878<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_Deposits</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_LettersOfCreditOutstandingAmount">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_LettersOfCreditOutstandingAmount</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_RevenueRemainingPerformanceObligation">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of transaction price allocated to performance obligation that has not been recognized as revenue.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 606<br> -SubTopic 10<br> -Section 50<br> -Paragraph 13<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123351226&amp;loc=SL49130556-203045<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_RevenueRemainingPerformanceObligation</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis=OPTT_SantanderBankMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis=OPTT_SantanderBankMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShortTermDebtTypeAxis=OPTT_LetterTwoMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShortTermDebtTypeAxis=OPTT_LetterTwoMember</td>
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<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AwardDateAxis=OPTT_AugustTwentyTwentyMember</td>
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<tr>
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</div></td></tr>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis=OPTT_ForeignFinancialInstitutionsMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<tr>
<td><strong> Data Type:</strong></td>
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<tr>
<td><strong> Balance Type:</strong></td>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_TypeOfArrangementAxis=OPTT_RestrictedCashAndSecurityAgreementsMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_TypeOfArrangementAxis=OPTT_RestrictedCashAndSecurityAgreementsMember</td>
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<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShortTermDebtTypeAxis=us-gaap_LetterOfCreditMember</td>
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<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<td><strong> Data Type:</strong></td>
<td>na</td>
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<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShortTermDebtTypeAxis=OPTT_LetterOneMember</td>
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<tr>
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<td></td>
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<td>na</td>
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<head>
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<span style="display: none;">v3.22.0.1</span><table class="report" border="0" cellspacing="2" id="idm140163162719896">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Schedule of Accounts Receivable, Contract Assets and Contract Liabilities (Details) - USD ($)<br> $ in Thousands</strong></div></th>
<th class="th"><div>Jan. 31, 2022</div></th>
<th class="th"><div>Apr. 30, 2021</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_DisclosureAccountReceivableAndContractAssetsAbstract', window );"><strong>Account Receivable And Contract Assets</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
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<td class="nump">$ 113<span></span>
</td>
<td class="nump">$ 350<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ContractWithCustomerAssetNetCurrent', window );">Contract assets</a></td>
<td class="nump">407<span></span>
</td>
<td class="nump">190<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ContractWithCustomerLiabilityCurrent', window );">Contract liabilities</a></td>
<td class="nump">$ 15<span></span>
</td>
<td class="text"> <span></span>
</td>
</tr>
</table>
<div style="display: none;">
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_DisclosureAccountReceivableAndContractAssetsAbstract</td>
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<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
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<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
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<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
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<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 310<br> -SubTopic 10<br> -Section 45<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=124259787&amp;loc=d3e4428-111522<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(3))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 3: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section 45<br> -Paragraph 1<br> -Subparagraph (c)<br> -URI http://asc.fasb.org/extlink&amp;oid=124098289&amp;loc=d3e6676-107765<br><br>Reference 4: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 310<br> -SubTopic 10<br> -Section 45<br> -Paragraph 9<br> -URI http://asc.fasb.org/extlink&amp;oid=124259787&amp;loc=d3e4531-111522<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AccountsReceivableNetCurrent</td>
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<tr>
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<td>instant</td>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 606<br> -SubTopic 10<br> -Section 45<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=123360276&amp;loc=SL49130531-203044<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 606<br> -SubTopic 10<br> -Section 45<br> -Paragraph 3<br> -URI http://asc.fasb.org/extlink&amp;oid=123360276&amp;loc=SL49130533-203044<br><br>Reference 3: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 606<br> -SubTopic 10<br> -Section 50<br> -Paragraph 8<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123351226&amp;loc=SL49130549-203045<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ContractWithCustomerAssetNetCurrent</td>
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<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ContractWithCustomerLiabilityCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 606<br> -SubTopic 10<br> -Section 45<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=123360276&amp;loc=SL49130531-203044<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 606<br> -SubTopic 10<br> -Section 45<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=123360276&amp;loc=SL49130532-203044<br><br>Reference 3: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 606<br> -SubTopic 10<br> -Section 50<br> -Paragraph 8<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123351226&amp;loc=SL49130549-203045<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ContractWithCustomerLiabilityCurrent</td>
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<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
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<td><strong> Balance Type:</strong></td>
<td>credit</td>
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<td><strong> Period Type:</strong></td>
<td>instant</td>
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<DOCUMENT>
<TYPE>XML
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<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
<html>
<head>
<title></title>
<link rel="stylesheet" type="text/css" href="report.css">
<script type="text/javascript" src="Show.js">/* Do Not Remove This Comment */</script><script type="text/javascript">
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<body>
<span style="display: none;">v3.22.0.1</span><table class="report" border="0" cellspacing="2" id="idm140163161838104">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Schedule of Significant Changes in Contract Assets and Contract Liabilities (Details) - USD ($)<br> $ in Thousands</strong></div></th>
<th class="th" colspan="2">9 Months Ended</th>
</tr>
<tr>
<th class="th"><div>Jan. 31, 2022</div></th>
<th class="th"><div>Jan. 31, 2021</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_DisclosureAccountReceivableAndContractAssetsAbstract', window );"><strong>Account Receivable And Contract Assets</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ContractWithCustomerAssetNet', window );">Transferred to receivables from contract assets recognized at the beginning of the period</a></td>
<td class="num">$ (190)<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ContractWithCustomerAssetNet', window );">Revenue recognized and not billed as of the end of the period</a></td>
<td class="nump">407<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rou">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_IncreaseDecreaseInContractWithCustomerAsset', window );">Net change in contract assets</a></td>
<td class="nump">$ 217<span></span>
</td>
<td class="num">$ (188)<span></span>
</td>
</tr>
</table>
<div style="display: none;">
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<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_DisclosureAccountReceivableAndContractAssetsAbstract</td>
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<td><strong> Data Type:</strong></td>
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<td><strong> Balance Type:</strong></td>
<td>na</td>
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</table></div>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ContractWithCustomerAssetNet">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 606<br> -SubTopic 10<br> -Section 50<br> -Paragraph 8<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123351226&amp;loc=SL49130549-203045<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 606<br> -SubTopic 10<br> -Section 45<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=123360276&amp;loc=SL49130531-203044<br><br>Reference 3: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 606<br> -SubTopic 10<br> -Section 45<br> -Paragraph 3<br> -URI http://asc.fasb.org/extlink&amp;oid=123360276&amp;loc=SL49130533-203044<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ContractWithCustomerAssetNet</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_IncreaseDecreaseInContractWithCustomerAsset">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of increase (decrease) in right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 28<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3602-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_IncreaseDecreaseInContractWithCustomerAsset</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
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<span style="display: none;">v3.22.0.1</span><table class="report" border="0" cellspacing="2" id="idm140163161926856">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Schedule of Other Current Assets (Details) - USD ($)<br> $ in Thousands</strong></div></th>
<th class="th"><div>Jan. 31, 2022</div></th>
<th class="th"><div>Apr. 30, 2021</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_DeferredCostsCapitalizedPrepaidAndOtherAssetsDisclosureAbstract', window );"><strong>Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PrepaidInsurance', window );">Prepaid insurance</a></td>
<td class="nump">$ 178<span></span>
</td>
<td class="nump">$ 194<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_PrepaidSoftwareAndLicenses', window );">Prepaid software &amp; licenses</a></td>
<td class="nump">84<span></span>
</td>
<td class="nump">93<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_PrepaidSalesAndMarketing', window );">Prepaid sales and marketing</a></td>
<td class="nump">65<span></span>
</td>
<td class="nump">37<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_PrepaidRecruitingAndHR', window );">Prepaid recruiting</a></td>
<td class="nump">57<span></span>
</td>
<td class="nump">12<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OtherReceivablesNetCurrent', window );">Other receivables</a></td>
<td class="nump">24<span></span>
</td>
<td class="nump">21<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_DepositsAssetsCurrent', window );">Deposits</a></td>
<td class="text"> <span></span>
</td>
<td class="nump">68<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OtherPrepaidExpenseCurrent', window );">Prepaid expenses- other</a></td>
<td class="nump">28<span></span>
</td>
<td class="nump">62<span></span>
</td>
</tr>
<tr class="reu">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OtherAssetsCurrent', window );">Other current assets</a></td>
<td class="nump">$ 436<span></span>
</td>
<td class="nump">$ 487<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_PrepaidRecruitingAndHR">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Prepaid Recruiting and HR.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_PrepaidRecruitingAndHR</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_PrepaidSalesAndMarketing">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Prepaid sales and marketing.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_PrepaidSalesAndMarketing</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_PrepaidSoftwareAndLicenses">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Prepaid software and licenses.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_PrepaidSoftwareAndLicenses</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_DeferredCostsCapitalizedPrepaidAndOtherAssetsDisclosureAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_DeferredCostsCapitalizedPrepaidAndOtherAssetsDisclosureAbstract</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_DepositsAssetsCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Carrying value of amounts transferred to third parties for security purposes that are expected to be returned or applied towards payment within one year or during the operating cycle, if shorter.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.17)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_DepositsAssetsCurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_OtherAssetsCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of current assets classified as other.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.8)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 2: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 852<br> -SubTopic 10<br> -Section 55<br> -Paragraph 10<br> -URI http://asc.fasb.org/extlink&amp;oid=84165509&amp;loc=d3e56426-112766<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OtherAssetsCurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_OtherPrepaidExpenseCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of asset related to consideration paid in advance for other costs that provide economic benefits within a future period of one year or the normal operating cycle, if longer.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 340<br> -SubTopic 10<br> -Section 45<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=6387103&amp;loc=d3e6435-108320<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section 45<br> -Paragraph 1<br> -Subparagraph (g)<br> -URI http://asc.fasb.org/extlink&amp;oid=124098289&amp;loc=d3e6676-107765<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section 45<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=124098289&amp;loc=d3e6787-107765<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OtherPrepaidExpenseCurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_OtherReceivablesNetCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount, after allowance, of receivables classified as other, due within one year or the operating cycle, if longer.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OtherReceivablesNetCurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_PrepaidInsurance">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of asset related to consideration paid in advance for insurance that provides economic benefits within a future period of one year or the normal operating cycle, if longer.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 340<br> -SubTopic 10<br> -Section 45<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=6387103&amp;loc=d3e6435-108320<br><br>Reference 2: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 340<br> -SubTopic 10<br> -Section 05<br> -Paragraph 5<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123349782&amp;loc=d3e5879-108316<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section 45<br> -Paragraph 1<br> -Subparagraph (g)(1)<br> -URI http://asc.fasb.org/extlink&amp;oid=124098289&amp;loc=d3e6676-107765<br><br>Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section 45<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=124098289&amp;loc=d3e6787-107765<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_PrepaidInsurance</td>
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<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
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<span style="display: none;">v3.22.0.1</span><table class="report" border="0" cellspacing="2" id="idm140163161756536">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Schedule of Components of Property and Equipment (Details) - USD ($)<br> $ in Thousands</strong></div></th>
<th class="th"><div>Jan. 31, 2022</div></th>
<th class="th"><div>Apr. 30, 2021</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PropertyPlantAndEquipmentLineItems', window );"><strong>Property, Plant and Equipment [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PropertyPlantAndEquipmentGross', window );">Property and equipment, gross</a></td>
<td class="nump">$ 1,682<span></span>
</td>
<td class="nump">$ 1,619<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment', window );">Less: accumulated depreciation</a></td>
<td class="num">(1,317)<span></span>
</td>
<td class="num">(1,213)<span></span>
</td>
</tr>
<tr class="rou">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PropertyPlantAndEquipmentNet', window );">Property and equipment, net</a></td>
<td class="nump">365<span></span>
</td>
<td class="nump">406<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_EquipmentMember', window );">Equipment [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PropertyPlantAndEquipmentLineItems', window );"><strong>Property, Plant and Equipment [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PropertyPlantAndEquipmentGross', window );">Property and equipment, gross</a></td>
<td class="nump">320<span></span>
</td>
<td class="nump">291<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PropertyPlantAndEquipmentByTypeAxis=OPTT_ComputerEquipmentAndSoftwareMember', window );">Computer Equipment And Software [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PropertyPlantAndEquipmentLineItems', window );"><strong>Property, Plant and Equipment [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PropertyPlantAndEquipmentGross', window );">Property and equipment, gross</a></td>
<td class="nump">521<span></span>
</td>
<td class="nump">498<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PropertyPlantAndEquipmentByTypeAxis=OPTT_OfficeFurnitureAndEquipmentMember', window );">Office Furniture And Equipment [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PropertyPlantAndEquipmentLineItems', window );"><strong>Property, Plant and Equipment [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PropertyPlantAndEquipmentGross', window );">Property and equipment, gross</a></td>
<td class="nump">352<span></span>
</td>
<td class="nump">341<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_LeaseholdImprovementsMember', window );">Leasehold Improvements [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PropertyPlantAndEquipmentLineItems', window );"><strong>Property, Plant and Equipment [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PropertyPlantAndEquipmentGross', window );">Property and equipment, gross</a></td>
<td class="nump">474<span></span>
</td>
<td class="nump">474<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_ConstructionInProgressMember', window );">Construction in Progress [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PropertyPlantAndEquipmentLineItems', window );"><strong>Property, Plant and Equipment [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PropertyPlantAndEquipmentGross', window );">Property and equipment, gross</a></td>
<td class="nump">$ 15<span></span>
</td>
<td class="nump">$ 15<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 360<br> -SubTopic 10<br> -Section 50<br> -Paragraph 1<br> -Subparagraph (c)<br> -URI http://asc.fasb.org/extlink&amp;oid=6391035&amp;loc=d3e2868-110229<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.14)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_PropertyPlantAndEquipmentGross">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 360<br> -SubTopic 10<br> -Section 50<br> -Paragraph 1<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=6391035&amp;loc=d3e2868-110229<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.13)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_PropertyPlantAndEquipmentGross</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_PropertyPlantAndEquipmentLineItems">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_PropertyPlantAndEquipmentLineItems</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_PropertyPlantAndEquipmentNet">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(14))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 360<br> -SubTopic 10<br> -Section 50<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=6391035&amp;loc=d3e2868-110229<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 944<br> -SubTopic 210<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.7-03(a)(8))<br> -URI http://asc.fasb.org/extlink&amp;oid=120400017&amp;loc=d3e572229-122910<br><br>Reference 4: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 942<br> -SubTopic 360<br> -Section 50<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=124429447&amp;loc=SL124453093-239630<br><br>Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(13))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 6: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 852<br> -SubTopic 10<br> -Section 55<br> -Paragraph 10<br> -URI http://asc.fasb.org/extlink&amp;oid=84165509&amp;loc=d3e56426-112766<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_PropertyPlantAndEquipmentNet</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_EquipmentMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_EquipmentMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_PropertyPlantAndEquipmentByTypeAxis=OPTT_ComputerEquipmentAndSoftwareMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_PropertyPlantAndEquipmentByTypeAxis=OPTT_ComputerEquipmentAndSoftwareMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_PropertyPlantAndEquipmentByTypeAxis=OPTT_OfficeFurnitureAndEquipmentMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_PropertyPlantAndEquipmentByTypeAxis=OPTT_OfficeFurnitureAndEquipmentMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_LeaseholdImprovementsMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_LeaseholdImprovementsMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_ConstructionInProgressMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_ConstructionInProgressMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
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<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
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</DOCUMENT>
<DOCUMENT>
<TYPE>XML
<SEQUENCE>57
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<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
<html>
<head>
<title></title>
<link rel="stylesheet" type="text/css" href="report.css">
<script type="text/javascript" src="Show.js">/* Do Not Remove This Comment */</script><script type="text/javascript">
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							e.nextSibling.style.display='block';
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</head>
<body>
<span style="display: none;">v3.22.0.1</span><table class="report" border="0" cellspacing="2" id="idm140163162390456">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Property and Equipment, net (Details Narrative) - USD ($)<br> $ in Thousands</strong></div></th>
<th class="th" colspan="2">9 Months Ended</th>
</tr>
<tr>
<th class="th"><div>Jan. 31, 2022</div></th>
<th class="th"><div>Jan. 31, 2021</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PropertyPlantAndEquipmentAbstract', window );"><strong>Property, Plant and Equipment [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_Depreciation', window );">Depreciation expense</a></td>
<td class="nump">$ 104,000<span></span>
</td>
<td class="nump">$ 106,000<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_Depreciation">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 360<br> -SubTopic 10<br> -Section 50<br> -Paragraph 1<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=6391035&amp;loc=d3e2868-110229<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 28<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3602-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_Depreciation</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_PropertyPlantAndEquipmentAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_PropertyPlantAndEquipmentAbstract</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
</div>
</body>
</html>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>XML
<SEQUENCE>58
<FILENAME>R48.htm
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
<html>
<head>
<title></title>
<link rel="stylesheet" type="text/css" href="report.css">
<script type="text/javascript" src="Show.js">/* Do Not Remove This Comment */</script><script type="text/javascript">
							function toggleNextSibling (e) {
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							e.nextSibling.style.display='block';
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</head>
<body>
<span style="display: none;">v3.22.0.1</span><table class="report" border="0" cellspacing="2" id="idm140163163285928">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Schedule of Operating Lease Costs (Details) - USD ($)<br> $ in Thousands</strong></div></th>
<th class="th" colspan="2">3 Months Ended</th>
<th class="th" colspan="2">9 Months Ended</th>
</tr>
<tr>
<th class="th"><div>Jan. 31, 2022</div></th>
<th class="th"><div>Jan. 31, 2021</div></th>
<th class="th"><div>Jan. 31, 2022</div></th>
<th class="th"><div>Jan. 31, 2021</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_DisclosureLeasesAbstract', window );"><strong>Leases</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OperatingLeaseCost', window );">Operating lease cost</a></td>
<td class="nump">$ 92<span></span>
</td>
<td class="nump">$ 79<span></span>
</td>
<td class="nump">$ 276<span></span>
</td>
<td class="nump">$ 238<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShortTermLeaseCost', window );">Short-term lease cost</a></td>
<td class="nump">12<span></span>
</td>
<td class="nump">7<span></span>
</td>
<td class="nump">22<span></span>
</td>
<td class="nump">12<span></span>
</td>
</tr>
<tr class="rou">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LeaseCost', window );">Total lease cost</a></td>
<td class="nump">$ 104<span></span>
</td>
<td class="nump">$ 86<span></span>
</td>
<td class="nump">$ 298<span></span>
</td>
<td class="nump">$ 250<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_DisclosureLeasesAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_DisclosureLeasesAbstract</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_LeaseCost">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of lease cost recognized by lessee for lease contract.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 50<br> -Paragraph 4<br> -URI http://asc.fasb.org/extlink&amp;oid=123408670&amp;loc=SL77918686-209980<br><br>Reference 2: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 55<br> -Paragraph 53<br> -URI http://asc.fasb.org/extlink&amp;oid=123414884&amp;loc=SL77918982-209971<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_LeaseCost</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_OperatingLeaseCost">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 55<br> -Paragraph 53<br> -URI http://asc.fasb.org/extlink&amp;oid=123414884&amp;loc=SL77918982-209971<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 50<br> -Paragraph 4<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=123408670&amp;loc=SL77918686-209980<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OperatingLeaseCost</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShortTermLeaseCost">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of short-term lease cost, excluding expense for lease with term of one month or less.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 50<br> -Paragraph 4<br> -Subparagraph (c)<br> -URI http://asc.fasb.org/extlink&amp;oid=123408670&amp;loc=SL77918686-209980<br><br>Reference 2: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 55<br> -Paragraph 53<br> -URI http://asc.fasb.org/extlink&amp;oid=123414884&amp;loc=SL77918982-209971<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShortTermLeaseCost</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
</div>
</body>
</html>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>XML
<SEQUENCE>59
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<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
<html>
<head>
<title></title>
<link rel="stylesheet" type="text/css" href="report.css">
<script type="text/javascript" src="Show.js">/* Do Not Remove This Comment */</script><script type="text/javascript">
							function toggleNextSibling (e) {
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							e.nextSibling.style.display='block';
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</head>
<body>
<span style="display: none;">v3.22.0.1</span><table class="report" border="0" cellspacing="2" id="idm140163163246904">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Schedule of Right-of Use Assets and Lease Liabilities (Details) - USD ($)<br> $ in Thousands</strong></div></th>
<th class="th"><div>Jan. 31, 2022</div></th>
<th class="th"><div>Apr. 30, 2021</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_DisclosureLeasesAbstract', window );"><strong>Leases</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OperatingLeaseRightOfUseAsset', window );">Operating right-of-use asset, net</a></td>
<td class="nump">$ 825<span></span>
</td>
<td class="nump">$ 1,036<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OperatingLeaseLiabilityCurrent', window );">Right-of-use liability- current</a></td>
<td class="nump">323<span></span>
</td>
<td class="nump">347<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OperatingLeaseLiabilityNoncurrent', window );">Right-of-use liability- long term</a></td>
<td class="nump">615<span></span>
</td>
<td class="nump">$ 819<span></span>
</td>
</tr>
<tr class="reu">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OperatingLeaseLiability', window );">Total lease liability</a></td>
<td class="nump">$ 938<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1', window );">Weighted average remaining lease term- operating leases</a></td>
<td class="text">2 years 7 months 9 days<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent', window );">Weighted average discount rate- operating leases</a></td>
<td class="nump">8.20%<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_DisclosureLeasesAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_DisclosureLeasesAbstract</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_OperatingLeaseLiability">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Present value of lessee's discounted obligation for lease payments from operating lease.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 45<br> -Paragraph 1<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=123391704&amp;loc=SL77918627-209977<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OperatingLeaseLiability</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_OperatingLeaseLiabilityCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Present value of lessee's discounted obligation for lease payments from operating lease, classified as current.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 45<br> -Paragraph 1<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=123391704&amp;loc=SL77918627-209977<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OperatingLeaseLiabilityCurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_OperatingLeaseLiabilityNoncurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 45<br> -Paragraph 1<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=123391704&amp;loc=SL77918627-209977<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OperatingLeaseLiabilityNoncurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_OperatingLeaseRightOfUseAsset">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of lessee's right to use underlying asset under operating lease.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 45<br> -Paragraph 1<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123391704&amp;loc=SL77918627-209977<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OperatingLeaseRightOfUseAsset</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Weighted average discount rate for operating lease calculated at point in time.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 50<br> -Paragraph 4<br> -Subparagraph (g)(4)<br> -URI http://asc.fasb.org/extlink&amp;oid=123408670&amp;loc=SL77918686-209980<br><br>Reference 2: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 55<br> -Paragraph 53<br> -URI http://asc.fasb.org/extlink&amp;oid=123414884&amp;loc=SL77918982-209971<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dtr-types:percentItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 55<br> -Paragraph 53<br> -URI http://asc.fasb.org/extlink&amp;oid=123414884&amp;loc=SL77918982-209971<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 50<br> -Paragraph 4<br> -Subparagraph (g)(3)<br> -URI http://asc.fasb.org/extlink&amp;oid=123408670&amp;loc=SL77918686-209980<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:durationItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
</div>
</body>
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<title></title>
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<span style="display: none;">v3.22.0.1</span><table class="report" border="0" cellspacing="2" id="idm140163161811768">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Schedule of Future Minimum Lease Payments Under Operating Lease (Details)<br> $ in Thousands</strong></div></th>
<th class="th">
<div>Jan. 31, 2022 </div>
<div>USD ($)</div>
</th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_DisclosureLeasesAbstract', window );"><strong>Leases</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear', window );">Remainder of fiscal year 2022</a></td>
<td class="nump">$ 99<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths', window );">2023</a></td>
<td class="nump">391<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo', window );">2024</a></td>
<td class="nump">362<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree', window );">2025</a></td>
<td class="nump">184<span></span>
</td>
</tr>
<tr class="rou">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue', window );">Total future minimum lease payments</a></td>
<td class="nump">1,036<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount', window );">Less imputed interest</a></td>
<td class="num">(98)<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OperatingLeaseLiability', window );">Total</a></td>
<td class="nump">$ 938<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_DisclosureLeasesAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_DisclosureLeasesAbstract</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of lessee's undiscounted obligation for lease payment for operating lease.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 50<br> -Paragraph 6<br> -URI http://asc.fasb.org/extlink&amp;oid=123408670&amp;loc=SL77918701-209980<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 50<br> -Paragraph 6<br> -URI http://asc.fasb.org/extlink&amp;oid=123408670&amp;loc=SL77918701-209980<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 50<br> -Paragraph 6<br> -URI http://asc.fasb.org/extlink&amp;oid=123408670&amp;loc=SL77918701-209980<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 50<br> -Paragraph 6<br> -URI http://asc.fasb.org/extlink&amp;oid=123408670&amp;loc=SL77918701-209980<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of lessee's undiscounted obligation for lease payment for operating lease having initial or remaining lease term in excess of one year to be paid in remainder of current fiscal year.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 50<br> -Paragraph 6<br> -URI http://asc.fasb.org/extlink&amp;oid=123408670&amp;loc=SL77918701-209980<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of lessee's undiscounted obligation for lease payments in excess of discounted obligation for lease payments for operating lease.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 50<br> -Paragraph 6<br> -URI http://asc.fasb.org/extlink&amp;oid=123408670&amp;loc=SL77918701-209980<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_OperatingLeaseLiability">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Present value of lessee's discounted obligation for lease payments from operating lease.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 45<br> -Paragraph 1<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=123391704&amp;loc=SL77918627-209977<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OperatingLeaseLiability</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
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<DOCUMENT>
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<DESCRIPTION>IDEA: XBRL DOCUMENT
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<html>
<head>
<title></title>
<link rel="stylesheet" type="text/css" href="report.css">
<script type="text/javascript" src="Show.js">/* Do Not Remove This Comment */</script><script type="text/javascript">
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<span style="display: none;">v3.22.0.1</span><table class="report" border="0" cellspacing="2" id="idm140163161763208">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Leases (Details Narrative) - USD ($)<br></strong></div></th>
<th class="th" colspan="2">3 Months Ended</th>
<th class="th" colspan="2">9 Months Ended</th>
</tr>
<tr>
<th class="th"><div>Jan. 31, 2022</div></th>
<th class="th"><div>Jan. 31, 2021</div></th>
<th class="th"><div>Jan. 31, 2022</div></th>
<th class="th"><div>Jan. 31, 2021</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OperatingLeasePayments', window );">Operating lease payments</a></td>
<td class="nump">$ 111,000<span></span>
</td>
<td class="nump">$ 91,000<span></span>
</td>
<td class="nump">$ 315,000<span></span>
</td>
<td class="nump">$ 259,000<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_BusinessAcquisitionAxis=OPTT_ThreeDentAcquisitionMember', window );">3Dent Acquisition [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LesseeOperatingLeaseOptionToExtend', window );">Lessee, operating lease, option to extend</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">expire
in January of 2023<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LesseeOperatingLeaseTermOfContract', window );">Lessee, operating lease, term of contract</a></td>
<td class="text">3 years<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">3 years<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LeaseExpirationDate1', window );">Lease expiration date</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">Jun. 30,  2022<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_srt_StatementGeographicalAxis=OPTT_MonroeTownshipMember', window );">Monroe Township [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LesseeOperatingLeaseOptionToExtend', window );">Lessee, operating lease, option to extend</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">The initial lease term is for seven years which expires in November of 2024 with an option
to extend the lease for another five years.<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LesseeOperatingLeaseTermOfContract', window );">Lessee, operating lease, term of contract</a></td>
<td class="text">7 years<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">7 years<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_LeaseExpirationDate1">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Date which lease or group of leases is set to expire, in YYYY-MM-DD format.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_LeaseExpirationDate1</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:dateItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_LesseeOperatingLeaseOptionToExtend">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Description of terms and conditions of option to extend lessee's operating lease. Includes, but is not limited to, information about option recognized as part of right-of-use asset and lease liability.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 50<br> -Paragraph 3<br> -Subparagraph (a)(3)<br> -URI http://asc.fasb.org/extlink&amp;oid=123408670&amp;loc=SL77918673-209980<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_LesseeOperatingLeaseOptionToExtend</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_LesseeOperatingLeaseTermOfContract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 50<br> -Paragraph 3<br> -Subparagraph (a)(3)<br> -URI http://asc.fasb.org/extlink&amp;oid=123408670&amp;loc=SL77918673-209980<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_LesseeOperatingLeaseTermOfContract</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:durationItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_OperatingLeasePayments">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 45<br> -Paragraph 5<br> -Subparagraph (c)<br> -URI http://asc.fasb.org/extlink&amp;oid=123391704&amp;loc=SL77918643-209977<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 50<br> -Paragraph 4<br> -Subparagraph (g)(1)<br> -URI http://asc.fasb.org/extlink&amp;oid=123408670&amp;loc=SL77918686-209980<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OperatingLeasePayments</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_BusinessAcquisitionAxis=OPTT_ThreeDentAcquisitionMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_BusinessAcquisitionAxis=OPTT_ThreeDentAcquisitionMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_srt_StatementGeographicalAxis=OPTT_MonroeTownshipMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">srt_StatementGeographicalAxis=OPTT_MonroeTownshipMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
</div>
</body>
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<DOCUMENT>
<TYPE>XML
<SEQUENCE>62
<FILENAME>R52.htm
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
<html>
<head>
<title></title>
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<span style="display: none;">v3.22.0.1</span><table class="report" border="0" cellspacing="2" id="idm140163153762296">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Schedule of Accrued Expenses (Details) - USD ($)<br> $ in Thousands</strong></div></th>
<th class="th"><div>Jan. 31, 2022</div></th>
<th class="th"><div>Apr. 30, 2021</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PayablesAndAccrualsAbstract', window );"><strong>Payables and Accruals [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ConstructionPayableCurrent', window );">Project costs</a></td>
<td class="nump">$ 102<span></span>
</td>
<td class="nump">$ 368<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LossContingencyAccrualCarryingValueCurrent', window );">Contract loss reserve</a></td>
<td class="nump">328<span></span>
</td>
<td class="nump">328<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OtherEmployeeRelatedLiabilitiesCurrent', window );">Employee incentive payments</a></td>
<td class="nump">191<span></span>
</td>
<td class="nump">283<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AccruedSalariesCurrent', window );">Accrued salary and benefits</a></td>
<td class="nump">409<span></span>
</td>
<td class="nump">631<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AccruedProfessionalFeesCurrent', window );">Professional fees</a></td>
<td class="nump">96<span></span>
</td>
<td class="nump">200<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OtherAccruedLiabilitiesCurrent', window );">Other</a></td>
<td class="nump">166<span></span>
</td>
<td class="nump">71<span></span>
</td>
</tr>
<tr class="rou">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AccruedLiabilitiesCurrent', window );">Accrued expenses total&#160;</a></td>
<td class="nump">$ 1,292<span></span>
</td>
<td class="nump">$ 1,881<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AccruedLiabilitiesCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.20)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AccruedLiabilitiesCurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
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<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AccruedProfessionalFeesCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Carrying value as of the balance sheet date of obligations incurred through that date and payable for professional fees, such as for legal and accounting services received. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section 45<br> -Paragraph 6<br> -URI http://asc.fasb.org/extlink&amp;oid=124098289&amp;loc=d3e6911-107765<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.20)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section 45<br> -Paragraph 8<br> -URI http://asc.fasb.org/extlink&amp;oid=124098289&amp;loc=d3e6935-107765<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AccruedProfessionalFeesCurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
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<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AccruedSalariesCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Carrying value as of the balance sheet date of the obligations incurred through that date and payable for employees' services provided. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section 45<br> -Paragraph 6<br> -URI http://asc.fasb.org/extlink&amp;oid=124098289&amp;loc=d3e6911-107765<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.20)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section 45<br> -Paragraph 8<br> -URI http://asc.fasb.org/extlink&amp;oid=124098289&amp;loc=d3e6935-107765<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AccruedSalariesCurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ConstructionPayableCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Carrying value as of the balance sheet date of obligations incurred and payable for the acquisition of merchandise, materials, supplies and services pertaining to construction projects such as a housing development or factory expansion not classified as trade payables. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.19(a))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ConstructionPayableCurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_LossContingencyAccrualCarryingValueCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of loss contingency liability expected to be resolved within one year or the normal operating cycle, if longer.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 450<br> -SubTopic 20<br> -Section 50<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=121557415&amp;loc=d3e14326-108349<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_LossContingencyAccrualCarryingValueCurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
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<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_OtherAccruedLiabilitiesCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of expenses incurred but not yet paid classified as other, due within one year or the normal operating cycle, if longer.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.20)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section 45<br> -Paragraph 6<br> -URI http://asc.fasb.org/extlink&amp;oid=124098289&amp;loc=d3e6911-107765<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section 45<br> -Paragraph 9<br> -URI http://asc.fasb.org/extlink&amp;oid=124098289&amp;loc=d3e7018-107765<br><br>Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section 45<br> -Paragraph 8<br> -URI http://asc.fasb.org/extlink&amp;oid=124098289&amp;loc=d3e6935-107765<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OtherAccruedLiabilitiesCurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<td>xbrli:monetaryItemType</td>
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<td><strong> Balance Type:</strong></td>
<td>credit</td>
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<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_OtherEmployeeRelatedLiabilitiesCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of obligations incurred for employer-related costs classified as other, payable within one year or the normal operating cycle, if longer.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.20)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OtherEmployeeRelatedLiabilitiesCurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
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</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
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<td><strong> Period Type:</strong></td>
<td>instant</td>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_PayablesAndAccrualsAbstract</td>
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<span style="display: none;">v3.22.0.1</span><table class="report" border="0" cellspacing="2" id="idm140163153739736">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Warrants (Details Narrative) - $ / shares<br></strong></div></th>
<th class="th"><div>Apr. 08, 2019</div></th>
<th class="th"><div>Jul. 22, 2016</div></th>
<th class="th"><div>Jun. 02, 2016</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems', window );"><strong>Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction', window );">Number of common stock shares sold</a></td>
<td class="nump">1,542,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StatementEquityComponentsAxis=OPTT_PreFundedWarrantsMember', window );">Pre-funded Warrants [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems', window );"><strong>Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights', window );">Purchase of warrants</a></td>
<td class="nump">3,385,680<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1', window );">Exercise price of warrants</a></td>
<td class="nump">$ 0.01<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StatementEquityComponentsAxis=OPTT_CommonWarrantsMember', window );">Common Warrants [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems', window );"><strong>Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights', window );">Purchase of warrants</a></td>
<td class="nump">4,927,680<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1', window );">Exercise price of warrants</a></td>
<td class="nump">$ 3.85<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_WarrantsAndRightsOutstandingTerm', window );">Warrants and rights outstanding, term</a></td>
<td class="text">5 years<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TypeOfArrangementAxis=OPTT_JunePurchaseAgreementMember', window );">June Purchase Agreement [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems', window );"><strong>Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction', window );">Number of common stock shares sold</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">20,850<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights', window );">Purchase of warrants</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">7,298<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight', window );">Purchase of common stock warrants</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">0.35<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_CommonStockCombinedPurchasePricePerShare', window );">Common stock combined purchase price per share</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 92.00<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1', window );">Exercise price of warrants</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 121.60<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_WarrantsAndRightsOutstandingTerm', window );">Warrants and rights outstanding, term</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">5 years<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_NumberOfExercisedWarrants', window );">Number of exercised warrants</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">0<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TypeOfArrangementAxis=OPTT_SecondAmendedPurchaseAgreementMember', window );">Second Amended Purchase Agreement [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems', window );"><strong>Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction', window );">Number of common stock shares sold</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">29,750<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights', window );">Purchase of warrants</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">8,925<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight', window );">Purchase of common stock warrants</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">0.30<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_CommonStockCombinedPurchasePricePerShare', window );">Common stock combined purchase price per share</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 135.00<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1', window );">Exercise price of warrants</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 187.20<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_WarrantsAndRightsOutstandingTerm', window );">Warrants and rights outstanding, term</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">5 years<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_NumberOfExercisedWarrants', window );">Number of exercised warrants</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">0<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_WarrantsAndRightsOutstandingMaturityDate', window );">Warrants and Rights Outstanding, Maturity Date</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">Jan. 23,  2022<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_CommonStockCombinedPurchasePricePerShare">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Common stock combined purchase price per share.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_CommonStockCombinedPurchasePricePerShare</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dtr-types:perShareItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_NumberOfExercisedWarrants">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Number of exercised warrants.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_NumberOfExercisedWarrants</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Exercise price per share or per unit of warrants or rights outstanding.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section 50<br> -Paragraph 3<br> -URI http://asc.fasb.org/extlink&amp;oid=123467817&amp;loc=d3e21475-112644<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dtr-types:perShareItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Number of securities into which each warrant or right may be converted. For example, but not limited to, each warrant may be converted into two shares.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section 50<br> -Paragraph 3<br> -URI http://asc.fasb.org/extlink&amp;oid=123467817&amp;loc=d3e21475-112644<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_WarrantsAndRightsOutstandingMaturityDate">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Expiration date of outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur, in YYYY-MM-DD format.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 820<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (bbb)(2)<br> -URI http://asc.fasb.org/extlink&amp;oid=123874694&amp;loc=d3e19207-110258<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_WarrantsAndRightsOutstandingMaturityDate</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:dateItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_WarrantsAndRightsOutstandingTerm">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Period between issuance and expiration of outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 820<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (bbb)(2)<br> -URI http://asc.fasb.org/extlink&amp;oid=123874694&amp;loc=d3e19207-110258<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_WarrantsAndRightsOutstandingTerm</td>
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<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<td><strong> Data Type:</strong></td>
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<td><strong> Balance Type:</strong></td>
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<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
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</table></div>
</div></td></tr>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_StatementEquityComponentsAxis=OPTT_PreFundedWarrantsMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_StatementEquityComponentsAxis=OPTT_PreFundedWarrantsMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
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<td></td>
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<tr>
<td><strong> Period Type:</strong></td>
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</table></div>
</div></td></tr>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_StatementEquityComponentsAxis=OPTT_CommonWarrantsMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_StatementEquityComponentsAxis=OPTT_CommonWarrantsMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
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<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
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<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_TypeOfArrangementAxis=OPTT_JunePurchaseAgreementMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_TypeOfArrangementAxis=OPTT_JunePurchaseAgreementMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_TypeOfArrangementAxis=OPTT_SecondAmendedPurchaseAgreementMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_TypeOfArrangementAxis=OPTT_SecondAmendedPurchaseAgreementMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
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</DOCUMENT>
<DOCUMENT>
<TYPE>XML
<SEQUENCE>64
<FILENAME>R54.htm
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
<html>
<head>
<title></title>
<link rel="stylesheet" type="text/css" href="report.css">
<script type="text/javascript" src="Show.js">/* Do Not Remove This Comment */</script><script type="text/javascript">
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<body>
<span style="display: none;">v3.22.0.1</span><table class="report" border="0" cellspacing="2" id="idm140163163220280">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Paycheck Protection Program Loan (Details Narrative) - Paycheck Protection Program [Member] - USD ($)<br></strong></div></th>
<th class="th" colspan="1"></th>
<th class="th" colspan="1">9 Months Ended</th>
</tr>
<tr>
<th class="th"><div>May 03, 2020</div></th>
<th class="th"><div>Oct. 31, 2021</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems', window );"><strong>Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ProceedsFromLoanOriginations1', window );">Proceeds from loan originations</a></td>
<td class="nump">$ 890,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_DebtForgivenessDescription', window );">Debt forgiveness, description</a></td>
<td class="text">The
Company filed its loan forgiveness application at the end of February 2021 asking for 100% forgiveness of the loan. In June 2021, the
Company was informed that its application was approved, and that the loan is now fully forgiven. The Company recognized a gain on extinguishment
of PPP loan of approximately $890,000 during the nine months ended October 31, 2021 as reflected on the Consolidated Statement of Operations.<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_DebtInstrumentInterestRateStatedPercentage', window );">Debt interest rate</a></td>
<td class="nump">100.00%<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_RepaymentsOfLongTermDebt', window );">Repayments of long-term debt</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 890,000<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_DebtForgivenessDescription">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Description for the amount decreases as the indebtedness forgiven by the holder of the debt instrument.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_DebtForgivenessDescription</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
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<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
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<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_DebtInstrumentInterestRateStatedPercentage">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Contractual interest rate for funds borrowed, under the debt agreement.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 20<br> -Section 50<br> -Paragraph 1B<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=123466505&amp;loc=SL123495323-112611<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.22(a)(1))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_DebtInstrumentInterestRateStatedPercentage</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dtr-types:percentItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
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<tr>
<td><strong> Period Type:</strong></td>
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</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ProceedsFromLoanOriginations1">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Cash inflow associated with loan origination (the process when securing a mortgage for a piece of real property) or lease origination.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 12<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3179-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ProceedsFromLoanOriginations1</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_RepaymentsOfLongTermDebt">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 15<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3291-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_RepaymentsOfLongTermDebt</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_TypeOfArrangementAxis=OPTT_PaycheckProtectionProgramMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_TypeOfArrangementAxis=OPTT_PaycheckProtectionProgramMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
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<TYPE>XML
<SEQUENCE>65
<FILENAME>R55.htm
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
<html>
<head>
<title></title>
<link rel="stylesheet" type="text/css" href="report.css">
<script type="text/javascript" src="Show.js">/* Do Not Remove This Comment */</script><script type="text/javascript">
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<span style="display: none;">v3.22.0.1</span><table class="report" border="0" cellspacing="2" id="idm140163161930440">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Preferred Stock (Details Narrative) - $ / shares<br></strong></div></th>
<th class="th"><div>Jan. 31, 2022</div></th>
<th class="th"><div>Apr. 30, 2021</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_EquityAbstract', window );"><strong>Equity [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PreferredStockSharesAuthorized', window );">Preferred stock, shares authorized</a></td>
<td class="nump">5,000,000<span></span>
</td>
<td class="nump">5,000,000<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PreferredStockParOrStatedValuePerShare', window );">Preferred stock, par value</a></td>
<td class="nump">$ 0.001<span></span>
</td>
<td class="nump">$ 0.001<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PreferredStockSharesIssued', window );">Preferred stock, shares issued</a></td>
<td class="nump">0<span></span>
</td>
<td class="nump">0<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_EquityAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_EquityAbstract</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(28))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section 50<br> -Paragraph 13<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123467817&amp;loc=SL123496158-112644<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(28))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(28))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section 50<br> -Paragraph 13<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123467817&amp;loc=SL123496158-112644<br></p></div>
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<span style="display: none;">v3.22.0.1</span><table class="report" border="0" cellspacing="2" id="idm140163162012296">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Common Stock (Details Narrative) - $ / shares<br></strong></div></th>
<th class="th"><div>Jan. 31, 2022</div></th>
<th class="th"><div>Apr. 30, 2021</div></th>
</tr>
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<td class="text">&#160;<span></span>
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<td class="text">&#160;<span></span>
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<td class="nump">100,000,000<span></span>
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<td class="nump">100,000,000<span></span>
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<td class="nump">$ 0.001<span></span>
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<td class="nump">$ 0.001<span></span>
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<td class="nump">55,894,213<span></span>
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<td class="nump">52,458,011<span></span>
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<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CommonStockSharesOutstanding', window );">Common stock, shares outstanding</a></td>
<td class="nump">55,894,213<span></span>
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<td class="text">&#160;<span></span>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Face amount or stated value per share of common stock.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(29))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The maximum number of common shares permitted to be issued by an entity's charter and bylaws.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(29))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
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<td><strong> Name:</strong></td>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(29))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=123467817&amp;loc=d3e21463-112644<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(29))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
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<span style="display: none;">v3.22.0.1</span><table class="report" border="0" cellspacing="2" id="idm140163162446280">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Treasury Shares (Details Narrative) - shares<br></strong></div></th>
<th class="th" colspan="2">9 Months Ended</th>
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<th class="th"><div>Jan. 31, 2022</div></th>
<th class="th"><div>Jan. 31, 2021</div></th>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Number of shares that have been repurchased during the period and are being held in treasury.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=123467817&amp;loc=d3e21463-112644<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.3-04)<br> -URI http://asc.fasb.org/extlink&amp;oid=120397183&amp;loc=d3e187085-122770<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(29))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
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<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_TreasuryStockSharesAcquired</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
</div>
</body>
</html>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>XML
<SEQUENCE>68
<FILENAME>R58.htm
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
<html>
<head>
<title></title>
<link rel="stylesheet" type="text/css" href="report.css">
<script type="text/javascript" src="Show.js">/* Do Not Remove This Comment */</script><script type="text/javascript">
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<body>
<span style="display: none;">v3.22.0.1</span><table class="report" border="0" cellspacing="2" id="idm140163162770552">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Schedule of Valuation Assumptions (Details)<br></strong></div></th>
<th class="th" colspan="2">9 Months Ended</th>
</tr>
<tr>
<th class="th"><div>Jan. 31, 2022</div></th>
<th class="th"><div>Jan. 31, 2021</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems', window );"><strong>Share-based Compensation Arrangement by Share-based Payment Award [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate', window );">Expected dividend yield</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">0.00%<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate', window );">Expected volatility</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">146.10%<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AwardTypeAxis=us-gaap_EmployeeStockOptionMember', window );">Share-based Payment Arrangement, Option [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems', window );"><strong>Share-based Compensation Arrangement by Share-based Payment Award [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate', window );">Risk-free interest rate</a></td>
<td class="nump">1.50%<span></span>
</td>
<td class="nump">6.00%<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate', window );">Expected dividend yield</a></td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1', window );">Expected life (in years)</a></td>
<td class="text">5 years 7 months 6 days<span></span>
</td>
<td class="text">5 years 10 months 24 days<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate', window );">Expected volatility</a></td>
<td class="nump">121.90%<span></span>
</td>
<td class="nump">136.50%<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (f)(2)(iii)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dtr-types:percentItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (f)(2)(ii)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dtr-types:percentItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The risk-free interest rate assumption that is used in valuing an option on its own shares.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (f)(2)(iv)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dtr-types:percentItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (f)(2)(i)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SAB Topic 14.D.2)<br> -URI http://asc.fasb.org/extlink&amp;oid=122041274&amp;loc=d3e301413-122809<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:durationItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AwardTypeAxis=us-gaap_EmployeeStockOptionMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AwardTypeAxis=us-gaap_EmployeeStockOptionMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
</div>
</body>
</html>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>XML
<SEQUENCE>69
<FILENAME>R59.htm
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
<html>
<head>
<title></title>
<link rel="stylesheet" type="text/css" href="report.css">
<script type="text/javascript" src="Show.js">/* Do Not Remove This Comment */</script><script type="text/javascript">
							function toggleNextSibling (e) {
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							e.nextSibling.style.display='block';
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</head>
<body>
<span style="display: none;">v3.22.0.1</span><table class="report" border="0" cellspacing="2" id="idm140163160877496">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Schedule of Stock Option Activity (Details) - $ / shares<br></strong></div></th>
<th class="th" colspan="1">9 Months Ended</th>
</tr>
<tr><th class="th"><div>Jan. 31, 2022</div></th></tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AwardTypeAxis=OPTT_StockIncentivePlanMember', window );">Stock Incentive Plan [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems', window );"><strong>Share-based Compensation Arrangement by Share-based Payment Award [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber', window );">Shares Underlying Options Outstanding, Beginning</a></td>
<td class="nump">516,827<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice', window );">Weighted Average Exercise Price, Beginning Balance</a></td>
<td class="nump">$ 3.89<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2', window );">Weighted Average Remaining Contractual Term (In Years), Beginning</a></td>
<td class="text">9 years<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross', window );">Shares Underlying Options Outstanding, Granted</a></td>
<td class="nump">793,850<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice', window );">Weighted Average Exercise Price, Granted</a></td>
<td class="nump">$ 1.43<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised', window );">Shares Underlying Options Outstanding, Exercised</a></td>
<td class="num">(44,332)<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice', window );">Weighted Average Exercise Price, Exercised</a></td>
<td class="nump">$ 1.05<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_StockIssuedDuringPeriodSharesStockOptionsExpired', window );">Shares Underlying Options Outstanding, Expired</a></td>
<td class="num">(1,806)<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice', window );">Weighted Average Exercise Price, Expired</a></td>
<td class="nump">$ 32.62<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod', window );">Shares Underlying Options Outstanding, Cancelled/forfeited</a></td>
<td class="num">(121,383)<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice', window );">Weighted Average Exercise Price, Cancelled/forfeited</a></td>
<td class="nump">$ 3.03<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber', window );">Shares Underlying Options Outstanding, Ending</a></td>
<td class="nump">1,143,156<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice', window );">Weighted Average Exercise Price, Ending Balance</a></td>
<td class="nump">$ 2.34<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm', window );">Weighted Average Remaining Contractual Term (In Years), Ending</a></td>
<td class="text">9 years 4 months 24 days<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber', window );">Shares Underlying Options Outstanding, Exercisable at Ending</a></td>
<td class="nump">308,481<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice', window );">Weighted Average Exercise Price, Exercisable at Ending</a></td>
<td class="nump">$ 4.59<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1', window );">Weighted Average Remaining Contractual Term (In Years), Exercisable at Ending</a></td>
<td class="text">8 years 1 month 6 days<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AwardTypeAxis=OPTT_PerformanceStockOptionsMember', window );">Performance Stock Options [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems', window );"><strong>Share-based Compensation Arrangement by Share-based Payment Award [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber', window );">Shares Underlying Options Outstanding, Beginning</a></td>
<td class="nump">424,790<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice', window );">Weighted Average Exercise Price, Beginning Balance</a></td>
<td class="nump">$ 2.57<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2', window );">Weighted Average Remaining Contractual Term (In Years), Beginning</a></td>
<td class="text">9 years 6 months<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross', window );">Shares Underlying Options Outstanding, Granted</a></td>
<td class="nump">66,667<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice', window );">Weighted Average Exercise Price, Granted</a></td>
<td class="nump">$ 0.62<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised', window );">Shares Underlying Options Outstanding, Exercised</a></td>
<td class="num">(40,668)<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice', window );">Weighted Average Exercise Price, Exercised</a></td>
<td class="nump">$ 1.05<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod', window );">Shares Underlying Options Outstanding, Cancelled/forfeited</a></td>
<td class="num">(220,766)<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice', window );">Weighted Average Exercise Price, Cancelled/forfeited</a></td>
<td class="nump">$ 2.58<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber', window );">Shares Underlying Options Outstanding, Ending</a></td>
<td class="nump">230,023<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice', window );">Weighted Average Exercise Price, Ending Balance</a></td>
<td class="nump">$ 2.26<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm', window );">Weighted Average Remaining Contractual Term (In Years), Ending</a></td>
<td class="text">9 years 1 month 6 days<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber', window );">Shares Underlying Options Outstanding, Exercisable at Ending</a></td>
<td class="text"> <span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1', window );">Weighted Average Remaining Contractual Term (In Years), Exercisable at Ending</a></td>
<td class="text">0 years<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Weighted Average Remaining Contractual Term (In Years), Ending.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:durationItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_StockIssuedDuringPeriodSharesStockOptionsExpired">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Stock issued during period shares stock options expired</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_StockIssuedDuringPeriodSharesStockOptionsExpired</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(1)(iii)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(1)(iii)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dtr-types:perShareItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(1)(iv)(3)-(4)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Weighted average price of options that were either forfeited or expired.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(1)(iv)(3)-(4)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dtr-types:perShareItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Gross number of share options (or share units) granted during the period.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Number of options outstanding, including both vested and non-vested options.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(1)(i)-(ii)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(1)(i)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dtr-types:perShareItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Weighted average price at which option holders acquired shares when converting their stock options into shares.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice</td>
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<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
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<td><strong> Data Type:</strong></td>
<td>dtr-types:perShareItemType</td>
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<td><strong> Balance Type:</strong></td>
<td>na</td>
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<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dtr-types:perShareItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dtr-types:perShareItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:durationItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (e)(1)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
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<td><strong> Data Type:</strong></td>
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<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Number of share options (or share units) exercised during the current period.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(1)(iv)(2)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.3-04)<br> -URI http://asc.fasb.org/extlink&amp;oid=120397183&amp;loc=d3e187085-122770<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(28))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(29))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=123467817&amp;loc=d3e21463-112644<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised</td>
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<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
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<td>xbrli:sharesItemType</td>
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<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AwardTypeAxis=OPTT_StockIncentivePlanMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AwardTypeAxis=OPTT_StockIncentivePlanMember</td>
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<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
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<td><strong> Data Type:</strong></td>
<td>na</td>
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<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
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<td><strong> Period Type:</strong></td>
<td></td>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AwardTypeAxis=OPTT_PerformanceStockOptionsMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AwardTypeAxis=OPTT_PerformanceStockOptionsMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
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<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
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<td><strong> Balance Type:</strong></td>
<td></td>
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<tr>
<td><strong> Period Type:</strong></td>
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<span style="display: none;">v3.22.0.1</span><table class="report" border="0" cellspacing="2" id="idm140163163559448">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Schedule of Business Acquisition and Fair Value of Net Assets, Compensation Expense Recognized (Details) - 3Dent Acquisition [Member]<br></strong></div></th>
<th class="th">
<div>Feb. 01, 2021 </div>
<div>USD ($)</div>
</th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_RestructuringCostAndReserveLineItems', window );"><strong>Restructuring Cost and Reserve [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_AdjustedFairValue', window );">Fair Value of Purchase</a></td>
<td class="nump">$ 1,161,267<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets', window );">Total Acquired Assets</a></td>
<td class="num">(593,571)<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities', window );">Total Acquired Liabilities</a></td>
<td class="nump">117,106<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_BusinessComibinationCompensationExpensesRecognized', window );">Compensation Expense</a></td>
<td class="nump">684,802<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_BusinessComibinationQuarterlyCompensationExpensesRecognized', window );">Quarterly Compensation Expense</a></td>
<td class="nump">$ 171,201<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_AdjustedFairValue">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Adjusted fair value.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_AdjustedFairValue</td>
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<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<td>xbrli:monetaryItemType</td>
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<td><strong> Balance Type:</strong></td>
<td>debit</td>
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<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_BusinessComibinationCompensationExpensesRecognized">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Business comibination compensation expenses recognized.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_BusinessComibinationCompensationExpensesRecognized</td>
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<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
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<td><strong> Data Type:</strong></td>
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<td>instant</td>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_BusinessComibinationQuarterlyCompensationExpensesRecognized">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Business comibination quarterly compensation expenses recognized.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_BusinessComibinationQuarterlyCompensationExpensesRecognized</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
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<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
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<td>instant</td>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of assets acquired at the acquisition date.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 805<br> -SubTopic 20<br> -Section 50<br> -Paragraph 1<br> -Subparagraph (c)<br> -URI http://asc.fasb.org/extlink&amp;oid=123413009&amp;loc=d3e4845-128472<br></p></div>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of liabilities assumed at the acquisition date.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 805<br> -SubTopic 20<br> -Section 50<br> -Paragraph 1<br> -Subparagraph (c)<br> -URI http://asc.fasb.org/extlink&amp;oid=123413009&amp;loc=d3e4845-128472<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities</td>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
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<span style="display: none;">v3.22.0.1</span><table class="report" border="0" cellspacing="2" id="idm140163156281816">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Schedule of Non-vested Restricted Stock Activity (Details) - Non-vested Restricted Stock [Member] - $ / shares<br></strong></div></th>
<th class="th" colspan="2">9 Months Ended</th>
</tr>
<tr>
<th class="th"><div>Jan. 31, 2022</div></th>
<th class="th"><div>Jan. 31, 2021</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems', window );"><strong>Share-based Compensation Arrangement by Share-based Payment Award [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber', window );">Number of Shares, Issued and unvested, Beginning</a></td>
<td class="nump">10,000<span></span>
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<td class="text">&#160;<span></span>
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<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue', window );">Weighted Average Price per Share, Issued and Unvested, Beginning</a></td>
<td class="nump">$ 2.93<span></span>
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<td class="text">&#160;<span></span>
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<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod', window );">Number of Shares, Granted</a></td>
<td class="nump">777,764<span></span>
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<td class="nump">10,000<span></span>
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<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue', window );">Weighted Average Price per Share, Granted</a></td>
<td class="nump">$ 1.42<span></span>
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<td class="text">&#160;<span></span>
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<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod', window );">Number of Shares, Vested</a></td>
<td class="num">(10,000)<span></span>
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<td class="text">&#160;<span></span>
</td>
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<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue', window );">Weighted Average Price per Share, Vested</a></td>
<td class="nump">$ 2.93<span></span>
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<td class="text">&#160;<span></span>
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<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod', window );">Number of Shares, Cancelled/forfeited</a></td>
<td class="text"> <span></span>
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<td class="text">&#160;<span></span>
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<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue', window );">Weighted Average Price per Share, Cancelled/forfeited</a></td>
<td class="text"> <span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber', window );">Number of Shares, Issued and Unvested, Ending</a></td>
<td class="nump">777,764<span></span>
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<td class="text">&#160;<span></span>
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<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue', window );">Weighted Average Price per Share, Issued and Unvested, Ending</a></td>
<td class="nump">$ 1.42<span></span>
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<td class="text">&#160;<span></span>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(1)(iv)(3)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod</td>
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<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
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<td><strong> Balance Type:</strong></td>
<td>na</td>
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<td><strong> Period Type:</strong></td>
<td>duration</td>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(2)(iii)(3)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dtr-types:perShareItemType</td>
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<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
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<td><strong> Period Type:</strong></td>
<td>duration</td>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(2)(iii)(1)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod</td>
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<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
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<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
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<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
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<td><strong> Period Type:</strong></td>
<td>duration</td>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(2)(iii)(1)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue</td>
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<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
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<td><strong> Data Type:</strong></td>
<td>dtr-types:perShareItemType</td>
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<td><strong> Balance Type:</strong></td>
<td>na</td>
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<td>duration</td>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(2)(i)-(ii)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber</td>
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<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(2)(i)-(ii)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dtr-types:perShareItemType</td>
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<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
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<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(2)(iii)(2)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
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<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
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</table></div>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(2)(iii)(2)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dtr-types:perShareItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
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<tr>
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<td>duration</td>
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</table></div>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
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<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
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<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AwardTypeAxis=OPTT_NonVestedRestrictedStockMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AwardTypeAxis=OPTT_NonVestedRestrictedStockMember</td>
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<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
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<td><strong> Data Type:</strong></td>
<td>na</td>
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<td><strong> Balance Type:</strong></td>
<td></td>
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<span style="display: none;">v3.22.0.1</span><table class="report" border="0" cellspacing="2" id="idm140163157300472">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Share-Based Compensation (Details Narrative) - USD ($)<br></strong></div></th>
<th class="th" colspan="1"></th>
<th class="th" colspan="2">1 Months Ended</th>
<th class="th" colspan="1">3 Months Ended</th>
<th class="th" colspan="2">9 Months Ended</th>
<th class="th" colspan="1"></th>
<th class="th" colspan="1"></th>
<th class="th" colspan="1"></th>
<th class="th" colspan="1"></th>
</tr>
<tr>
<th class="th"><div>Feb. 01, 2021</div></th>
<th class="th"><div>Jan. 31, 2021</div></th>
<th class="th"><div>Jan. 31, 2020</div></th>
<th class="th"><div>Jan. 31, 2022</div></th>
<th class="th"><div>Jan. 31, 2022</div></th>
<th class="th"><div>Jan. 31, 2021</div></th>
<th class="th"><div>Feb. 09, 2022</div></th>
<th class="th"><div>Feb. 08, 2022</div></th>
<th class="th"><div>Jan. 18, 2018</div></th>
<th class="th"><div>Dec. 31, 2015</div></th>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_BusinessAcquisitionAxis=OPTT_ThreeDentAcquisitionMember', window );">3Dent Acquisition [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems', window );"><strong>Share-based Compensation Arrangement by Share-based Payment Award [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_FairValueOfBasePurchasePrice', window );">Fair value of base purchase price</a></td>
<td class="nump">$ 1,451,584<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockIssuedDuringPeriodSharesNewIssues', window );">Stock Issued During Period, Shares, New Issues</a></td>
<td class="nump">361,991<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_BusinessAcquisitionSharePrice', window );">Business Acquisition, Share Price</a></td>
<td class="nump">$ 4.01<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_AdjustedFairValue', window );">Fair Value of Purchase</a></td>
<td class="nump">$ 1,161,267<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_BusinessComibinationQuarterlyCompensationExpensesConsiderationPaid', window );">Business comibination quarterly compensation expenses recognized consideration paid</a></td>
<td class="nump">$ 171,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AwardTypeAxis=us-gaap_EmployeeStockOptionMember', window );">Share-based Payment Arrangement, Option [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems', window );"><strong>Share-based Compensation Arrangement by Share-based Payment Award [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross', window );">Share-based compensation options, grants in period, gross</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">793,850<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">248,876<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue', window );">Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 11,560<span></span>
</td>
<td class="nump">$ 11,560<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares', window );">Options unvested</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">835,000<span></span>
</td>
<td class="nump">835,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1', window );">Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">9 years 10 months 24 days<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AllocatedShareBasedCompensationExpense', window );">Share-based payment arrangement, expense</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 183,000<span></span>
</td>
<td class="nump">$ 296,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AwardTypeAxis=us-gaap_EmployeeStockOptionMember', window );">Share-based Payment Arrangement, Option [Member] | Employee [Member] | Subject to Service- Based Vesting Requirements [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems', window );"><strong>Share-based Compensation Arrangement by Share-based Payment Award [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions', window );">Unrecognized compensation cost related to non-vested stock</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 0<span></span>
</td>
<td class="nump">$ 0<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod', window );">Restricted stock option granted</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">51,547<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AwardTypeAxis=OPTT_NonVestedStockMember', window );">Non-vested Stock [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems', window );"><strong>Share-based Compensation Arrangement by Share-based Payment Award [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions', window );">Unrecognized compensation cost related to non-vested stock</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">102,000<span></span>
</td>
<td class="nump">$ 102,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1', window );">Share-based compensation of weighted-average period</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">1 year<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AwardTypeAxis=OPTT_PerformanceStockOptionsMember', window );">Performance Stock Options [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems', window );"><strong>Share-based Compensation Arrangement by Share-based Payment Award [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross', window );">Share-based compensation options, grants in period, gross</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">66,667<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesVestedAndOutstanding', window );">Shares vested and outstanding</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">40,668<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_DebtInstrumentMaturityDate', window );">Debt expire date</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">Dec. 15,  2021<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AwardTypeAxis=OPTT_PerformanceStockOptionsMember', window );">Performance Stock Options [Member] | Two Executives [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems', window );"><strong>Share-based Compensation Arrangement by Share-based Payment Award [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross', window );">Share-based compensation options, grants in period, gross</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">81,337<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AwardTypeAxis=OPTT_PerformanceStockOptionsMember', window );">Performance Stock Options [Member] | Employees and Executives [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems', window );"><strong>Share-based Compensation Arrangement by Share-based Payment Award [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross', window );">Share-based compensation options, grants in period, gross</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">344,723<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">230,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_StockOptionsVestingPeriodDescription', window );">Stock options vesting period description</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">The awards vest over 2 years provided
there is positive total shareholder return (e.g. share price increase) as measured by the closing share price on January 14, 2022 and
January 14, 2023.<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AwardTypeAxis=us-gaap_PerformanceSharesMember', window );">Performance Shares [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems', window );"><strong>Share-based Compensation Arrangement by Share-based Payment Award [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue', window );">Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 0<span></span>
</td>
<td class="nump">$ 0<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares', window );">Options unvested</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">230,000<span></span>
</td>
<td class="nump">230,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1', window );">Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">9 years 1 month 6 days<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AllocatedShareBasedCompensationExpense', window );">Share-based payment arrangement, expense</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 123,000<span></span>
</td>
<td class="nump">$ 43,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions', window );">Unrecognized compensation cost related to non-vested stock</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 242,000,000,000<span></span>
</td>
<td class="nump">$ 242,000,000,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1', window );">Share-based compensation of weighted-average period</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">1 year 1 month 6 days<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AwardTypeAxis=OPTT_NonVestedRestrictedStockMember', window );">Non-vested Restricted Stock [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems', window );"><strong>Share-based Compensation Arrangement by Share-based Payment Award [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod', window );">Restricted stock option granted</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">777,764<span></span>
</td>
<td class="nump">10,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AwardTypeAxis=us-gaap_RestrictedStockMember', window );">Restricted Stock [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems', window );"><strong>Share-based Compensation Arrangement by Share-based Payment Award [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AllocatedShareBasedCompensationExpense', window );">Share-based payment arrangement, expense</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 43,000<span></span>
</td>
<td class="nump">$ 12,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1', window );">Share-based compensation of weighted-average period</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">1 year 4 months 24 days<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions', window );">Unrecognized compensation cost</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 54,000<span></span>
</td>
<td class="nump">$ 54,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AwardTypeAxis=us-gaap_StockOptionMember', window );">Equity Option [Member] | Employee [Member] | Subject to Service- Based Vesting Requirements [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems', window );"><strong>Share-based Compensation Arrangement by Share-based Payment Award [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AllocatedShareBasedCompensationExpense', window );">Share-based payment arrangement, expense</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 0<span></span>
</td>
<td class="nump">$ 30,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PlanNameAxis=OPTT_TwoThousandAndFifteenOmnibusIncentivePlanMember', window );">2015 Omnibus Incentive Plan [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems', window );"><strong>Share-based Compensation Arrangement by Share-based Payment Award [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized', window );">Share-based compensation arrangement shares authorized</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">1,332,036<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance', window );">Capital shares reserved for future issuance</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">696,627<span></span>
</td>
<td class="nump">696,627<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PlanNameAxis=OPTT_TwoThousandAndEighteenInducementPlanMember', window );">2018 Inducement Plan [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems', window );"><strong>Share-based Compensation Arrangement by Share-based Payment Award [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized', window );">Share-based compensation arrangement shares authorized</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">275,000<span></span>
</td>
<td class="nump">250,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance', window );">Capital shares reserved for future issuance</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">11,487<span></span>
</td>
<td class="nump">11,487<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">25,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_AdjustedFairValue">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Adjusted fair value.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_AdjustedFairValue</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_BusinessComibinationQuarterlyCompensationExpensesConsiderationPaid">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Business comibination quarterly compensation expenses recognized consideration paid.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_BusinessComibinationQuarterlyCompensationExpensesConsiderationPaid</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_FairValueOfBasePurchasePrice">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Fair value of base purchase price.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_FairValueOfBasePurchasePrice</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesVestedAndOutstanding">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Share based compensation arrangement by share based payment award number of shares vested and outstanding.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesVestedAndOutstanding</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_StockOptionsVestingPeriodDescription">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Stock options vesting period, description.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_StockOptionsVestingPeriodDescription</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AllocatedShareBasedCompensationExpense">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 1<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5047-113901<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SAB Topic 14.F)<br> -URI http://asc.fasb.org/extlink&amp;oid=122041274&amp;loc=d3e301413-122809<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (h)(1)(i)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AllocatedShareBasedCompensationExpense</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_BusinessAcquisitionSharePrice">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Price of a single share of a number of saleable stocks paid or offered to be paid in a business combination.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_BusinessAcquisitionSharePrice</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dtr-types:perShareItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Aggregate number of common shares reserved for future issuance.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.29)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_CommonStockCapitalSharesReservedForFutureIssuance</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_DebtInstrumentMaturityDate">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Date when the debt instrument is scheduled to be fully repaid, in YYYY-MM-DD format.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.22(a)(2))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 2: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 20<br> -Section 50<br> -Paragraph 1B<br> -Subparagraph (d)<br> -URI http://asc.fasb.org/extlink&amp;oid=123466505&amp;loc=SL123495323-112611<br><br>Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 820<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (bbb)(2)<br> -URI http://asc.fasb.org/extlink&amp;oid=123874694&amp;loc=d3e19207-110258<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_DebtInstrumentMaturityDate</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:dateItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (i)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:durationItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (i)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of cost to be recognized for option under share-based payment arrangement.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (i)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(2)(iii)(1)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Number of shares authorized for issuance under share-based payment arrangement.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (a)(3)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Gross number of share options (or share units) granted during the period.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Number of non-vested options outstanding.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
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<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Weighted average remaining contractual term for fully vested and expected to vest exercisable or convertible options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (e)(2)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1</td>
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<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
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<td><strong> Period Type:</strong></td>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Number of new stock issued during the period.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(29))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=123467817&amp;loc=d3e21463-112644<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.3-04)<br> -URI http://asc.fasb.org/extlink&amp;oid=120397183&amp;loc=d3e187085-122770<br><br>Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(28))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_StockIssuedDuringPeriodSharesNewIssues</td>
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<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
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<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_BusinessAcquisitionAxis=OPTT_ThreeDentAcquisitionMember</td>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AwardTypeAxis=us-gaap_EmployeeStockOptionMember</td>
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<tr>
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<td><strong> Data Type:</strong></td>
<td>na</td>
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<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
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<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">srt_TitleOfIndividualAxis=OPTT_EmployeeMember</td>
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<td>na</td>
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<td></td>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">srt_StatementScenarioAxis=OPTT_SubjectToServiceBasedVestingRequirementsMember</td>
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<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
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<tr>
<td><strong> Period Type:</strong></td>
<td></td>
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</div></td></tr>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AwardTypeAxis=OPTT_NonVestedStockMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AwardTypeAxis=OPTT_NonVestedStockMember</td>
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<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
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<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
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<tr>
<td><strong> Period Type:</strong></td>
<td></td>
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</div></td></tr>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AwardTypeAxis=OPTT_PerformanceStockOptionsMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AwardTypeAxis=OPTT_PerformanceStockOptionsMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">srt_TitleOfIndividualAxis=OPTT_TwoExecutivesMember</td>
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<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
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<tr>
<td><strong> Period Type:</strong></td>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_srt_TitleOfIndividualAxis=OPTT_EmployeesAndExecutivesMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">srt_TitleOfIndividualAxis=OPTT_EmployeesAndExecutivesMember</td>
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<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
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<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
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<td><strong> Balance Type:</strong></td>
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<tr>
<td><strong> Period Type:</strong></td>
<td></td>
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</table></div>
</div></td></tr>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AwardTypeAxis=us-gaap_PerformanceSharesMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AwardTypeAxis=us-gaap_PerformanceSharesMember</td>
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<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AwardTypeAxis=OPTT_NonVestedRestrictedStockMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AwardTypeAxis=OPTT_NonVestedRestrictedStockMember</td>
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<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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</tr>
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<td><strong> Data Type:</strong></td>
<td>na</td>
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<tr>
<td><strong> Period Type:</strong></td>
<td></td>
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</div></td></tr>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AwardTypeAxis=us-gaap_RestrictedStockMember">
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<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AwardTypeAxis=us-gaap_RestrictedStockMember</td>
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<tr>
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<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AwardTypeAxis=us-gaap_StockOptionMember</td>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_PlanNameAxis=OPTT_TwoThousandAndFifteenOmnibusIncentivePlanMember</td>
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<tr>
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<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions (Details)<br></strong></div></th>
<th class="th" colspan="1">9 Months Ended</th>
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<tr><th class="th"><div>Jan. 31, 2021</div></th></tr>
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<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate', window );">Dividend rate</a></td>
<td class="nump">0.00%<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate', window );">Expected volatility</a></td>
<td class="nump">146.10%<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_srt_RangeAxis=srt_MinimumMember', window );">Minimum [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems', window );"><strong>Fair Value Measurement Inputs and Valuation Techniques [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate', window );">Risk-free interest rate</a></td>
<td class="nump">0.07%<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1', window );">Expected life (in years)</a></td>
<td class="text">6 months<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_srt_RangeAxis=srt_MaximumMember', window );">Maximum [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems', window );"><strong>Fair Value Measurement Inputs and Valuation Techniques [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate', window );">Risk-free interest rate</a></td>
<td class="nump">0.08%<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1', window );">Expected life (in years)</a></td>
<td class="text">9 months 18 days<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (f)(2)(iii)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dtr-types:percentItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (f)(2)(ii)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
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<tr>
<td><strong> Data Type:</strong></td>
<td>dtr-types:percentItemType</td>
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<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
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<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
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</table></div>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The risk-free interest rate assumption that is used in valuing an option on its own shares.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (f)(2)(iv)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
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<tr>
<td><strong> Data Type:</strong></td>
<td>dtr-types:percentItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (f)(2)(i)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SAB Topic 14.D.2)<br> -URI http://asc.fasb.org/extlink&amp;oid=122041274&amp;loc=d3e301413-122809<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1</td>
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<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
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<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:durationItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_srt_RangeAxis=srt_MinimumMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">srt_RangeAxis=srt_MinimumMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
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<td><strong> Period Type:</strong></td>
<td></td>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_srt_RangeAxis=srt_MaximumMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">srt_RangeAxis=srt_MaximumMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
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<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
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<span style="display: none;">v3.22.0.1</span><table class="report" border="0" cellspacing="2" id="idm140163162831432">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Fair Value Measurements (Details Narrative) - USD ($)<br></strong></div></th>
<th class="th"><div>Jan. 31, 2022</div></th>
<th class="th"><div>Apr. 30, 2021</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_FairValueDisclosuresAbstract', window );"><strong>Fair Value Disclosures [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_FairValueNetAssetLiability', window );">Fair value on a recurring basis</a></td>
<td class="nump">$ 0<span></span>
</td>
<td class="nump">$ 0<span></span>
</td>
</tr>
</table>
<div style="display: none;">
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<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_FairValueDisclosuresAbstract</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
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<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_FairValueNetAssetLiability">
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<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Fair value of asset after deduction of liability.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_FairValueNetAssetLiability</td>
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<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
</div>
</body>
</html>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>XML
<SEQUENCE>75
<FILENAME>R65.htm
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
<html>
<head>
<title></title>
<link rel="stylesheet" type="text/css" href="report.css">
<script type="text/javascript" src="Show.js">/* Do Not Remove This Comment */</script><script type="text/javascript">
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<body>
<span style="display: none;">v3.22.0.1</span><table class="report" border="0" cellspacing="2" id="idm140163153837896">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Commitments and Contingencies (Details Narrative)<br></strong></div></th>
<th class="th">
<div>May 24, 2021 </div>
<div>USD ($)</div>
</th>
<th class="th">
<div>Aug. 28, 2018 </div>
<div>USD ($)</div>
</th>
<th class="th">
<div>Jan. 31, 2021 </div>
<div>USD ($)</div>
</th>
<th class="th">
<div>Jan. 31, 2021 </div>
<div>EUR (&#8364;)</div>
</th>
<th class="th">
<div>Jan. 25, 2021 </div>
<div>EUR (&#8364;)</div>
</th>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_IncomeStatementLocationAxis=us-gaap_SellingGeneralAndAdministrativeExpensesMember', window );">Selling, General and Administrative Expenses [Member] | Tax Authority, Spain [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LossContingenciesLineItems', window );"><strong>Loss Contingencies [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued', window );">Income tax penalties</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 331,000<span></span>
</td>
<td class="nump">&#8364; 279,870<span></span>
</td>
<td class="nump">&#8364; 279,870<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=OPTT_CharlesFDunleavyMember', window );">Charles F. Dunleavy [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
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<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
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<tr class="ro">
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<td class="nump">$ 1,223,963.14<span></span>
</td>
<td class="nump">$ 438,254.54<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
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<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The amount of estimated penalties and interest accrued as of the balance sheet date arising from income tax examinations.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 740<br> -SubTopic 10<br> -Section 50<br> -Paragraph 15<br> -Subparagraph (c)<br> -URI http://asc.fasb.org/extlink&amp;oid=121826272&amp;loc=d3e32718-109319<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The value (monetary amount) of the award the plaintiff seeks in the legal matter.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 450<br> -SubTopic 20<br> -Section 50<br> -Paragraph 9<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=121557415&amp;loc=d3e14557-108349<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 450<br> -SubTopic 20<br> -Section 50<br> -Paragraph 4<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=121557415&amp;loc=d3e14435-108349<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 450<br> -SubTopic 20<br> -Section 50<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=121557415&amp;loc=d3e14326-108349<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_LossContingencyDamagesSoughtValue</td>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
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<span style="display: none;">v3.22.0.1</span><table class="report" border="0" cellspacing="2" id="idm140163157284984">
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<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Income Taxes (Details Narrative) - USD ($)<br> $ in Thousands</strong></div></th>
<th class="th" colspan="2">3 Months Ended</th>
<th class="th" colspan="2">9 Months Ended</th>
<th class="th" colspan="2">12 Months Ended</th>
</tr>
<tr>
<th class="th"><div>Jan. 31, 2022</div></th>
<th class="th"><div>Jan. 31, 2021</div></th>
<th class="th"><div>Jan. 31, 2022</div></th>
<th class="th"><div>Jan. 31, 2021</div></th>
<th class="th"><div>Apr. 30, 2022</div></th>
<th class="th"><div>Apr. 30, 2021</div></th>
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<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
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<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OperatingIncomeLoss', window );">Operating Income (Loss)</a></td>
<td class="num">$ (5,552)<span></span>
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<td class="num">$ (15,768)<span></span>
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<td class="num">$ (9,569)<span></span>
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<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ProceedsFromDebtNetOfIssuanceCosts', window );">Proceeds from Debt, Net of Issuance Costs</a></td>
<td class="text">&#160;<span></span>
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<td class="text">&#160;<span></span>
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<td class="text">&#160;<span></span>
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<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">1,000<span></span>
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<td class="text">&#160;<span></span>
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<td class="text">&#160;<span></span>
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<td class="text">&#160;<span></span>
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<td class="text">&#160;<span></span>
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<td class="text">&#160;<span></span>
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<td class="text">&#160;<span></span>
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<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
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<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
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<td class="text">&#160;<span></span>
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<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
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<td class="nump">$ 20,000<span></span>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The net result for the period of deducting operating expenses from operating revenues.</p></div>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 14<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3255-108585<br></p></div>
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<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Operating Segments and Geographic Information (Details Narrative)<br></strong></div></th>
<th class="th" colspan="1">9 Months Ended</th>
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<div>Jan. 31, 2022 </div>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 18<br> -URI http://asc.fasb.org/extlink&amp;oid=123359005&amp;loc=d3e8672-108599<br></p></div>
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<span style="display: none;">v3.22.0.1</span><table class="report" border="0" cellspacing="2" id="idm140163161931320">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Schedule of Purchase Consideration (Details) - Marine Advanced Robotics, Inc. [Member]<br> $ in Thousands</strong></div></th>
<th class="th">
<div>Nov. 15, 2021 </div>
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<td class="nump">$ 11,902<span></span>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 805<br> -SubTopic 30<br> -Section 30<br> -Paragraph 8<br> -URI http://asc.fasb.org/extlink&amp;oid=116859721&amp;loc=d3e6613-128477<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 805<br> -SubTopic 30<br> -Section 50<br> -Paragraph 1<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=120321790&amp;loc=d3e6927-128479<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 805<br> -SubTopic 30<br> -Section 30<br> -Paragraph 7<br> -URI http://asc.fasb.org/extlink&amp;oid=116859721&amp;loc=d3e6578-128477<br></p></div>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 805<br> -SubTopic 30<br> -Section 30<br> -Paragraph 8<br> -URI http://asc.fasb.org/extlink&amp;oid=116859721&amp;loc=d3e6613-128477<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 805<br> -SubTopic 30<br> -Section 30<br> -Paragraph 7<br> -URI http://asc.fasb.org/extlink&amp;oid=116859721&amp;loc=d3e6578-128477<br></p></div>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of asset recognized arising from contingent consideration in a business combination.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 805<br> -SubTopic 30<br> -Section 25<br> -Paragraph 7<br> -URI http://asc.fasb.org/extlink&amp;oid=6911189&amp;loc=d3e6411-128476<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 805<br> -SubTopic 30<br> -Section 35<br> -Paragraph 1<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=116859824&amp;loc=d3e6819-128478<br><br>Reference 3: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 805<br> -SubTopic 30<br> -Section 50<br> -Paragraph 1<br> -Subparagraph (c)(1)<br> -URI http://asc.fasb.org/extlink&amp;oid=120321790&amp;loc=d3e6927-128479<br></p></div>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of liabilities assumed at the acquisition date.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 805<br> -SubTopic 20<br> -Section 50<br> -Paragraph 1<br> -Subparagraph (c)<br> -URI http://asc.fasb.org/extlink&amp;oid=123413009&amp;loc=d3e4845-128472<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 805<br> -SubTopic 30<br> -Section 50<br> -Paragraph 1<br> -Subparagraph (b)(1)<br> -URI http://asc.fasb.org/extlink&amp;oid=120321790&amp;loc=d3e6927-128479<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 13<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3213-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
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<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<span style="display: none;">v3.22.0.1</span><table class="report" border="0" cellspacing="2" id="idm140163153651992">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Schedule of Allocated Fair Value of Purchase Consideration (Details) - USD ($)<br> $ in Thousands</strong></div></th>
<th class="th"><div>Nov. 15, 2021</div></th>
<th class="th"><div>Jan. 31, 2022</div></th>
<th class="th"><div>Apr. 30, 2021</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_BusinessAcquisitionLineItems', window );"><strong>Business Acquisition [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_Goodwill', window );">Goodwill</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 7,754<span></span>
</td>
<td class="text"> <span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_BusinessAcquisitionAxis=OPTT_MarineAdvancedRoboticsIncMember', window );">Marine Advanced Robotics, Inc. [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_BusinessAcquisitionLineItems', window );"><strong>Business Acquisition [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_BusinessCombinationConsiderationTransferred1', window );">Total Purchase Consideration</a></td>
<td class="nump">$ 11,902<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill', window );">Intangible assets</a></td>
<td class="nump">3,900<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_BusinessAcquisitionAxis=OPTT_MarineAdvanceRoboticsIncMember', window );">Marine Advance Robotics Inc [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_BusinessAcquisitionLineItems', window );"><strong>Business Acquisition [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents', window );">Cash</a></td>
<td class="nump">12<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory', window );">Inventories</a></td>
<td class="nump">150<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment', window );">Property and equipment, net</a></td>
<td class="nump">38<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_Goodwill', window );">Goodwill</a></td>
<td class="nump">7,754<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet', window );">Net assets acquired</a></td>
<td class="nump">11,902<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_BusinessAcquisitionAxis=OPTT_MarineAdvanceRoboticsIncMember', window );">Marine Advance Robotics Inc [Member] | Patents [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_BusinessAcquisitionLineItems', window );"><strong>Business Acquisition [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill', window );">Intangible assets</a></td>
<td class="nump">1,193<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_BusinessAcquisitionAxis=OPTT_MarineAdvanceRoboticsIncMember', window );">Marine Advance Robotics Inc [Member] | Trade Names [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_BusinessAcquisitionLineItems', window );"><strong>Business Acquisition [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill', window );">Intangible assets</a></td>
<td class="nump">$ 2,755<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
</table>
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<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 805<br> -SubTopic 30<br> -Section 30<br> -Paragraph 8<br> -URI http://asc.fasb.org/extlink&amp;oid=116859721&amp;loc=d3e6613-128477<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 805<br> -SubTopic 30<br> -Section 50<br> -Paragraph 1<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=120321790&amp;loc=d3e6927-128479<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 805<br> -SubTopic 30<br> -Section 30<br> -Paragraph 7<br> -URI http://asc.fasb.org/extlink&amp;oid=116859721&amp;loc=d3e6578-128477<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 805<br> -SubTopic 20<br> -Section 50<br> -Paragraph 1<br> -Subparagraph (c)<br> -URI http://asc.fasb.org/extlink&amp;oid=123413009&amp;loc=d3e4845-128472<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of intangible assets, excluding goodwill, acquired at the acquisition date.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 805<br> -SubTopic 20<br> -Section 50<br> -Paragraph 1<br> -Subparagraph (c)<br> -URI http://asc.fasb.org/extlink&amp;oid=123413009&amp;loc=d3e4845-128472<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The amount of inventory recognized as of the acquisition date.</p></div>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The amount of property, plant, and equipment recognized as of the acquisition date.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 805<br> -SubTopic 10<br> -Section 55<br> -Paragraph 37<br> -URI http://asc.fasb.org/extlink&amp;oid=123455525&amp;loc=d3e2207-128464<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 805<br> -SubTopic 20<br> -Section 50<br> -Paragraph 1<br> -Subparagraph (c)<br> -URI http://asc.fasb.org/extlink&amp;oid=123413009&amp;loc=d3e4845-128472<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 805<br> -SubTopic 20<br> -Section 50<br> -Paragraph 1<br> -Subparagraph (c)<br> -URI http://asc.fasb.org/extlink&amp;oid=123413009&amp;loc=d3e4845-128472<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
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<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 942<br> -SubTopic 210<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.9-03(10)(1))<br> -URI http://asc.fasb.org/extlink&amp;oid=120398452&amp;loc=d3e534808-122878<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 350<br> -SubTopic 20<br> -Section 45<br> -Paragraph 5<br> -URI http://asc.fasb.org/extlink&amp;oid=120320667&amp;loc=SL49117168-202975<br><br>Reference 3: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 852<br> -SubTopic 10<br> -Section 55<br> -Paragraph 10<br> -URI http://asc.fasb.org/extlink&amp;oid=84165509&amp;loc=d3e56426-112766<br><br>Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 350<br> -SubTopic 20<br> -Section 45<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=99380562&amp;loc=d3e13770-109266<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_BusinessAcquisitionAxis=OPTT_MarineAdvancedRoboticsIncMember</td>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_BusinessAcquisitionAxis=OPTT_MarineAdvanceRoboticsIncMember</td>
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<span style="display: none;">v3.22.0.1</span><table class="report" border="0" cellspacing="2" id="idm140163153864008">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Business Combination (Details Narrative) - USD ($)<br></strong></div></th>
<th class="th" colspan="1"></th>
<th class="th" colspan="1"></th>
<th class="th" colspan="1">3 Months Ended</th>
<th class="th" colspan="1">9 Months Ended</th>
</tr>
<tr>
<th class="th"><div>Nov. 15, 2021</div></th>
<th class="th"><div>Feb. 01, 2021</div></th>
<th class="th"><div>Jan. 31, 2022</div></th>
<th class="th"><div>Jan. 31, 2022</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_BusinessAcquisitionLineItems', window );"><strong>Business Acquisition [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockIssuedDuringPeriodValueAcquisitions', window );">Stock Issued During Period, Value, Acquisitions</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 5,855,000<span></span>
</td>
<td class="nump">$ 5,855,000<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_BusinessCombinationAcquisitionRelatedCosts', window );">Acquisition related costs</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 300,000<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_BusinessAcquisitionAxis=OPTT_ThreeDentAcquisitionMember', window );">3Dent Acquisition [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_BusinessAcquisitionLineItems', window );"><strong>Business Acquisition [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockIssuedDuringPeriodSharesAcquisitions', window );">Stock Issued During Period, Shares, Acquisitions</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">361,991<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockIssuedDuringPeriodValueAcquisitions', window );">Stock Issued During Period, Value, Acquisitions</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 360,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_BusinessAcquisitionSharePrice', window );">Business Acquisition, Share Price</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 4.01<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_BusinessAcquisitionAxis=OPTT_MarineAdvancedRoboticsIncMember', window );">Marine Advanced Robotics, Inc. [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_BusinessAcquisitionLineItems', window );"><strong>Business Acquisition [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PaymentsToAcquireBusinessesGross', window );">Payments to Acquire Businesses, Gross</a></td>
<td class="nump">$ 4,000,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_BusinessCombinationContingentConsiderationAsset', window );">Business Combination, Contingent Consideration, Asset</a></td>
<td class="nump">$ 1,591,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_BusinessAcquisitionProFormaInformationDescription', window );">Business combination, description</a></td>
<td class="text">the
contingent consideration consists of two earn-out periods, one running from the date of the acquisition through April 30, 2023 in
which the maximum earn-out is $1.5 million and the other from May 1, 2023 through April 30, 2024 where the maximum earn-out is $2
million. The fair value as of the date of acquisition was determined using a simulation model based on an estimate of revenues
during these periods and discount factors ranging from 5.8% to 14.5%.<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_BusinessCombinationConsiderationTransferred1', window );">Business Combination, Consideration Transferred</a></td>
<td class="nump">$ 11,902,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill', window );">Business acquistion intangible assets</a></td>
<td class="nump">$ 3,900,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_BusinessAcquisitionAxis=OPTT_MarineAdvancedRoboticsIncMember', window );">Marine Advanced Robotics, Inc. [Member] | Restricted Stock [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_BusinessAcquisitionLineItems', window );"><strong>Business Acquisition [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued', window );">Business Acquisition, Equity Interest Issued or Issuable, Number of Shares</a></td>
<td class="nump">3,330,162<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned', window );">Business Acquisition, Equity Interest Issued or Issuable, Value Assigned</a></td>
<td class="nump">$ 5,900,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_BusinessAcquisitionSharePrice', window );">Business Acquisition, Share Price</a></td>
<td class="nump">$ 2.10<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
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<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Value of equity interests (such as common shares, preferred shares, or partnership interest) issued or issuable to acquire the entity.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 805<br> -SubTopic 30<br> -Section 50<br> -Paragraph 1<br> -Subparagraph (b)(4)<br> -URI http://asc.fasb.org/extlink&amp;oid=120321790&amp;loc=d3e6927-128479<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned</td>
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<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
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<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Number of shares of equity interests issued or issuable to acquire entity.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 805<br> -SubTopic 30<br> -Section 50<br> -Paragraph 1<br> -Subparagraph (b)(4)<br> -URI http://asc.fasb.org/extlink&amp;oid=120321790&amp;loc=d3e6927-128479<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
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<td><strong> Name:</strong></td>
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<td><strong> Period Type:</strong></td>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Description of the pro forma information, nature of adjustments made to historical information to arrive at pro forma amounts, amounts excluded from pro forma information, any material-nonrecurring items included in the pro forma information and limitations of pro forma disclosures.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 805<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (h)<br> -URI http://asc.fasb.org/extlink&amp;oid=79982066&amp;loc=d3e1392-128463<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_BusinessAcquisitionProFormaInformationDescription</td>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Price of a single share of a number of saleable stocks paid or offered to be paid in a business combination.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_BusinessAcquisitionSharePrice</td>
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<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<td><strong> Data Type:</strong></td>
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<td><strong> Balance Type:</strong></td>
<td>na</td>
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<td><strong> Period Type:</strong></td>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 805<br> -SubTopic 10<br> -Section 25<br> -Paragraph 23<br> -URI http://asc.fasb.org/extlink&amp;oid=123586518&amp;loc=d3e1043-128460<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_BusinessCombinationAcquisitionRelatedCosts</td>
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<td><strong> Balance Type:</strong></td>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 805<br> -SubTopic 30<br> -Section 30<br> -Paragraph 8<br> -URI http://asc.fasb.org/extlink&amp;oid=116859721&amp;loc=d3e6613-128477<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 805<br> -SubTopic 30<br> -Section 50<br> -Paragraph 1<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=120321790&amp;loc=d3e6927-128479<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 805<br> -SubTopic 30<br> -Section 30<br> -Paragraph 7<br> -URI http://asc.fasb.org/extlink&amp;oid=116859721&amp;loc=d3e6578-128477<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_BusinessCombinationConsiderationTransferred1</td>
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<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<td><strong> Balance Type:</strong></td>
<td>credit</td>
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<td><strong> Period Type:</strong></td>
<td>duration</td>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of asset recognized arising from contingent consideration in a business combination.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 805<br> -SubTopic 30<br> -Section 25<br> -Paragraph 7<br> -URI http://asc.fasb.org/extlink&amp;oid=6911189&amp;loc=d3e6411-128476<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 805<br> -SubTopic 30<br> -Section 35<br> -Paragraph 1<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=116859824&amp;loc=d3e6819-128478<br><br>Reference 3: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 805<br> -SubTopic 30<br> -Section 50<br> -Paragraph 1<br> -Subparagraph (c)(1)<br> -URI http://asc.fasb.org/extlink&amp;oid=120321790&amp;loc=d3e6927-128479<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_BusinessCombinationContingentConsiderationAsset</td>
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<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<td><strong> Data Type:</strong></td>
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<td><strong> Balance Type:</strong></td>
<td>debit</td>
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<td><strong> Period Type:</strong></td>
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</table></div>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of intangible assets, excluding goodwill, acquired at the acquisition date.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 805<br> -SubTopic 20<br> -Section 50<br> -Paragraph 1<br> -Subparagraph (c)<br> -URI http://asc.fasb.org/extlink&amp;oid=123413009&amp;loc=d3e4845-128472<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill</td>
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<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<td><strong> Data Type:</strong></td>
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<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
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<td><strong> Period Type:</strong></td>
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</table></div>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_PaymentsToAcquireBusinessesGross">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 805<br> -SubTopic 30<br> -Section 50<br> -Paragraph 1<br> -Subparagraph (b)(1)<br> -URI http://asc.fasb.org/extlink&amp;oid=120321790&amp;loc=d3e6927-128479<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 13<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3213-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_PaymentsToAcquireBusinessesGross</td>
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<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<td><strong> Data Type:</strong></td>
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<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_StockIssuedDuringPeriodSharesAcquisitions">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Number of shares of stock issued during the period pursuant to acquisitions.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(29))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.3-04)<br> -URI http://asc.fasb.org/extlink&amp;oid=120397183&amp;loc=d3e187085-122770<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(28))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_StockIssuedDuringPeriodSharesAcquisitions</td>
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<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
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<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
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<td><strong> Period Type:</strong></td>
<td>duration</td>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Value of stock issued pursuant to acquisitions during the period.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=123467817&amp;loc=d3e21463-112644<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.3-04)<br> -URI http://asc.fasb.org/extlink&amp;oid=120397183&amp;loc=d3e187085-122770<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.29-31)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_StockIssuedDuringPeriodValueAcquisitions</td>
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<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<td><strong> Balance Type:</strong></td>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_BusinessAcquisitionAxis=OPTT_ThreeDentAcquisitionMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_BusinessAcquisitionAxis=OPTT_ThreeDentAcquisitionMember</td>
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<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<td><strong> Data Type:</strong></td>
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<td><strong> Balance Type:</strong></td>
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<td><strong> Period Type:</strong></td>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_BusinessAcquisitionAxis=OPTT_MarineAdvancedRoboticsIncMember</td>
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<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
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<td><strong> Data Type:</strong></td>
<td>na</td>
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<td><strong> Balance Type:</strong></td>
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<tr>
<td><strong> Period Type:</strong></td>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AwardTypeAxis=us-gaap_RestrictedStockMember</td>
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<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<td><strong> Data Type:</strong></td>
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<span style="display: none;">v3.22.0.1</span><table class="report" border="0" cellspacing="2" id="idm140163162987064">
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<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Subsequent Events (Details Narrative) - USD ($)<br> $ in Thousands</strong></div></th>
<th class="th" colspan="1">1 Months Ended</th>
<th class="th" colspan="2">3 Months Ended</th>
<th class="th" colspan="2">9 Months Ended</th>
</tr>
<tr>
<th class="th"><div>Feb. 28, 2022</div></th>
<th class="th"><div>Jan. 31, 2022</div></th>
<th class="th"><div>Jan. 31, 2021</div></th>
<th class="th"><div>Jan. 31, 2022</div></th>
<th class="th"><div>Jan. 31, 2021</div></th>
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<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SubsequentEventLineItems', window );"><strong>Subsequent Event [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
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<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_IncomeTaxExpenseBenefit', window );">Income Tax Expense (Benefit)</a></td>
<td class="text">&#160;<span></span>
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<td class="text"> <span></span>
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<td class="text"> <span></span>
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<td class="num">$ (1,041)<span></span>
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<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember', window );">Subsequent Event [Member] | New Jersey Division of Taxation [Member]</a></td>
<td class="text">&#160;<span></span>
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<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
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<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SubsequentEventLineItems', window );"><strong>Subsequent Event [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
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<td class="text">&#160;<span></span>
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<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
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<td class="text">&#160;<span></span>
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<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OperatingLossCarryforwards', window );">Operating Loss Carryforwards</a></td>
<td class="nump">$ 4,000<span></span>
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<td class="text">&#160;<span></span>
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<td class="text">&#160;<span></span>
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<td class="text">&#160;<span></span>
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<td class="text">&#160;<span></span>
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<td class="text">&#160;<span></span>
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<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.</p></div>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.</p></div>
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      decimals="-3"
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    <us-gaap:BusinessDescriptionAndBasisOfPresentationTextBlock contextRef="From2021-05-01to2022-01-31">&lt;p id="xdx_806_eus-gaap--BusinessDescriptionAndBasisOfPresentationTextBlock_zkWcjBuhQ4L5" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;(1)
&lt;span id="xdx_826_zS6TElivvWR2"&gt;Background, Basis of Presentation and Liquidity&lt;/span&gt;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;&lt;i&gt;(a)
Background&lt;/i&gt;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;



&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.25in; text-indent: -0.25in"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;&lt;i&gt;&#160;&lt;/i&gt;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Ocean
Power Technologies, Inc. (the &#x201c;Company&#x201d;) was founded in 1984 in New Jersey, commenced business operations in 1994 and re-incorporated
in Delaware in 2007. We are a complete solutions provider, controlling the design, manufacturing, sales, installation, operations and
maintenance of our products and services. Our solutions provide distributed offshore power which is persistent, reliable, and economical
along with power and communications for remote surface and subsea applications. Historically, funding from government agencies, such
as research and development grants, accounted for a significant portion of the Company&#x2019;s revenues. Today our goal is to generate
the majority of our revenue from the sale or lease of our products and solutions, and sales of services to support our business operations.
As we continue to develop and commercialize our products and services, we expect to have a net decrease in cash due to the use of cash
from operating activities unless and until we achieve positive cash flow from the commercialization of products, solutions and services.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;&lt;i&gt;(b)
Basis of Presentation&lt;/i&gt;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;



&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.25in; text-indent: -0.25in"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;&lt;i&gt;&#160;&lt;/i&gt;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;The
accompanying unaudited consolidated financial statements have been prepared in accordance with accounting principles generally accepted
in the United States of America (&#x201c;GAAP&#x201d;) and for interim financial information in accordance with the Securities and Exchange
Commission (&#x201c;SEC&#x201d;), instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all the
information and footnotes required by GAAP for complete financial statements. In the opinion of management, all adjustments (consisting
of normal recurring adjustments) considered necessary for a fair presentation have been included. The interim operating results are not
necessarily indicative of the results for a full year or for any other interim period. Further information on potential factors that
could affect the Company&#x2019;s financial results can be found in the Company&#x2019;s Annual Report on Form 10-K for the year ended
April 30, 2021, as filed with the SEC and elsewhere in this Form 10-Q. Certain items have been reclassified from prior periods to be
consistent with current GAAP presentations.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;&lt;i&gt;(c)
Liquidity&lt;/i&gt;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;



&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.25in; text-indent: -0.25in"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;&lt;i&gt;&#160;&lt;/i&gt;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;For
the nine months ended January 31, 2022, and the fiscal year ended April 30, 2021, the Company incurred net losses of approximately $&lt;span id="xdx_905_eus-gaap--NetIncomeLoss_iN_pn5n6_di_c20210501__20220131_zJzs7XuJKCr8" title="Net loss"&gt;13.7
&lt;/span&gt;&lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;million and $&lt;span id="xdx_906_eus-gaap--NetIncomeLoss_iN_pn5n6_di_c20200501__20210430_zqag8EAq5Vch" title="Net loss"&gt;14.8
&lt;/span&gt;&lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;million, respectively, and used cash in operating
activities of approximately $&lt;span id="xdx_908_eus-gaap--NetCashProvidedByUsedInOperatingActivities_iN_pn5n6_di_c20210501__20220131_zSVVxKozt4Rj" title="Net cash in operating activities"&gt;15.8
&lt;/span&gt;&lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;million and $&lt;span id="xdx_900_eus-gaap--NetCashProvidedByUsedInOperatingActivities_iN_pn5n6_di_c20200501__20210430_zPz2ST3dW749" title="Net cash in operating activities"&gt;11.7
&lt;/span&gt;&lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;million, respectively. The Company has continued
to make investments in ongoing product development efforts in anticipation of future growth, including its recent acquisition of Marine
Advanced Robotics, Inc., as described in Note 18. The Company&#x2019;s future results of operations involve significant risks and uncertainties.
Factors that could affect the Company&#x2019;s future operating results and could cause actual results to vary materially from expectations
include, but are not limited to, performance of its products, its ability to market and commercialize its products and new products that
it may develop, technology development, scalability of technology and production, ability to attract and retain key personnel, concentration
of customers and suppliers, deployment risks and integration of acquisitions, pending or threatened litigation, and the impact of COVID-19,
and any variants on its business. The Company previously obtained equity financing through its At the Market Offering Agreement (&#x201c;ATM&#x201d;)
with A.G.P/Alliance Global Partners (&#x201c;AGP&#x201d;) and through its equity line financing with Aspire Capital Fund, LLC (&#x201c;Aspire
Capital&#x201d;), but the Company cannot be sure that additional equity and/or debt financing will be available to the Company as needed
on acceptable terms, or at all. For fiscal year 2022 to date, management has not obtained any additional capital financing. Management
believes the Company&#x2019;s current cash balance of $&lt;span id="xdx_907_eus-gaap--Cash_iI_pn5n6_c20220131_zzYnUqU3V4sh"&gt;63.5&lt;/span&gt;&lt;/span&gt;
&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;million is sufficient to fund its planned expenditures through
at least March 2023.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;On
January 7, 2019, the Company entered into an At the Market Offering Agreement with AGP (the &#x201c;2019 ATM Facility&#x201d;), under which
the Company could issue and sell to or through AGP, acting as agent and/or principal, shares of the Company&#x2019;s common stock having
an aggregate offering price of up to $&lt;span id="xdx_904_eus-gaap--ProceedsFromIssuanceInitialPublicOffering_pn5n6_c20190106__20190107__us-gaap--TypeOfArrangementAxis__custom--TwoThousandNinteenATMFacilityMember__dei--LegalEntityAxis__custom--AGPAllianceGlobalPartnersMember_zqyQZ18NAmnh" title="Proceeds from initial public offering"&gt;25.0&lt;/span&gt; million. From inception of the program through its termination on December 8, 2020, under
the 2019 ATM Facility, the Company sold and issued an aggregate of &lt;span id="xdx_90E_eus-gaap--SaleOfStockNumberOfSharesIssuedInTransaction_pid_c20190106__20190107__us-gaap--TypeOfArrangementAxis__custom--TwoThousandNinteenATMFacilityMember__dei--LegalEntityAxis__custom--AGPAllianceGlobalPartnersMember_zDTm2R3uSKvi" title="Number of common stock shares sold"&gt;17,595,472&lt;/span&gt; shares of its common stock with an aggregate market value
of $&lt;span id="xdx_903_eus-gaap--SaleOfStockConsiderationReceivedPerTransaction_pn5n6_c20190106__20190107__us-gaap--TypeOfArrangementAxis__custom--TwoThousandNinteenATMFacilityMember__dei--LegalEntityAxis__custom--AGPAllianceGlobalPartnersMember_zspnLaf4ker1" title="Proceeds from issuance or sale of equity, net of issuance costs"&gt;23.4&lt;/span&gt; million at an average price of $&lt;span id="xdx_90F_eus-gaap--SaleOfStockPricePerShare_iI_pid_c20190107__us-gaap--TypeOfArrangementAxis__custom--TwoThousandNinteenATMFacilityMember__dei--LegalEntityAxis__custom--AGPAllianceGlobalPartnersMember_z6Wv99wrEUl5" title="Average purchase price per share"&gt;1.33&lt;/span&gt; per share, including &lt;span id="xdx_908_eus-gaap--SaleOfStockNumberOfSharesIssuedInTransaction_pid_c20190106__20190107__dei--LegalEntityAxis__custom--AGPAllianceGlobalPartnersMember_zVH1837TVZXe" title="Number of common stock shares sold"&gt;12,342,506&lt;/span&gt; shares in fiscal year 2021 with an aggregate market value
of $&lt;span id="xdx_900_eus-gaap--SaleOfStockConsiderationReceivedPerTransaction_pn5n6_c20190106__20190107__dei--LegalEntityAxis__custom--AGPAllianceGlobalPartnersMember_zBjAoYMsRVD7" title="Proceeds from issuance or sale of equity, net of issuance costs"&gt;18.7&lt;/span&gt; million at an average price of $&lt;span id="xdx_906_eus-gaap--SaleOfStockPricePerShare_iI_pid_c20190701__dei--LegalEntityAxis__custom--AGPAllianceGlobalPartnersMember_zJqwl1LzcXb5" title="Combined purchase price per share"&gt;1.51&lt;/span&gt; per share and paid AGP a sales commission of approximately $&lt;span id="xdx_905_ecustom--PaymentOfSalesCommission_pn5n6_c20190106__20190107__us-gaap--TypeOfArrangementAxis__custom--TwoThousandNinteenATMFacilityMember__dei--LegalEntityAxis__custom--AGPAllianceGlobalPartnersMember_zKrYzQkr3Xna" title="Payment of sales commission"&gt;0.8&lt;/span&gt; million related to those
shares. The agreement was fully utilized and terminated on December 8, 2020.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"/&gt;



&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;On
November 20, 2020, the Company entered into another At the Market Offering Agreement with AGP (the &#x201c;2020 ATM Facility&#x201d;),
having capacity up to $&lt;span id="xdx_901_eus-gaap--DeferredOfferingCosts_iI_pn5n6_c20201120_zrwXDFFFR2Ha" title="Deferred Offering Costs"&gt;100.0&lt;/span&gt; million. On December 4, 2020, the Company filed a prospectus with the Securities and Exchange Commission
whereby, the Company could issue and sell to or through AGP, acting as agent and/or principal, shares of the Company&#x2019;s common stock
having an aggregate offering price of up to $&lt;span id="xdx_900_ecustom--ProceedsFromInitialPublicOffering_pn5n6_c20201118__20201120__us-gaap--TypeOfArrangementAxis__custom--TwoThousandTwentyATMFacilityMember__dei--LegalEntityAxis__custom--AGPAllianceGlobalPartnersMember_z9CC9Z2TQ58c" title="Proceeds from initial public offering"&gt;50.0&lt;/span&gt; million. From inception of the 2020 ATM Facility through January 31, 2022, the Company
had sold and issued an aggregate of &lt;span id="xdx_900_eus-gaap--SaleOfStockNumberOfSharesIssuedInTransaction_pid_c20210501__20220131__us-gaap--TypeOfArrangementAxis__custom--TwoThousandTwentyATMFacilityMember__dei--LegalEntityAxis__custom--AGPAllianceGlobalPartnersMember_zxlJY405TmBk" title="Number of common stock shares sold"&gt;17,179,883&lt;/span&gt; shares of its common stock with an aggregate market value of $&lt;span id="xdx_90F_eus-gaap--SaleOfStockConsiderationReceivedPerTransaction_pn5n6_c20210501__20220131__us-gaap--TypeOfArrangementAxis__custom--TwoThousandTwentyATMFacilityMember__dei--LegalEntityAxis__custom--AGPAllianceGlobalPartnersMember_zpcxC0lXPuCk" title="Proceeds from issuance or sale of equity, net of issuance costs"&gt;50.0&lt;/span&gt; million at an average
price of $&lt;span id="xdx_90E_eus-gaap--SaleOfStockPricePerShare_iI_pid_c20220131__us-gaap--TypeOfArrangementAxis__custom--TwoThousandTwentyATMFacilityMember__dei--LegalEntityAxis__custom--AGPAllianceGlobalPartnersMember_z2SqAYI9mROl" title="Combined purchase price per share"&gt;2.91&lt;/span&gt; per share and paid AGP a sales commission of approximately $&lt;span id="xdx_905_ecustom--PaymentOfSalesCommission_pn5n6_c20210501__20220131__us-gaap--TypeOfArrangementAxis__custom--TwoThousandTwentyATMFacilityMember__dei--LegalEntityAxis__custom--AGPAllianceGlobalPartnersMember_zjuJmXNgWEO5" title="Payment of sales commission"&gt;1.6&lt;/span&gt; million related to those shares. A prospectus supplement
was filed on January 10, 2022 to allow the Company to sell an additional $&lt;span id="xdx_905_ecustom--PaymentOfSalesCommission_pn5n6_c20210501__20220131__us-gaap--TypeOfArrangementAxis__custom--TwoThousandTwentyATMFacilityMember_zCFYS4sCujfi" title="Payment of sales commission"&gt;25.0&lt;/span&gt; million (or an aggregate of $&lt;span id="xdx_909_eus-gaap--SaleOfStockConsiderationReceivedPerTransaction_pn5n6_c20210501__20220131__us-gaap--TypeOfArrangementAxis__custom--TwoThousandTwentyATMFacilityMember_zciOEyO60asf"&gt;75.0&lt;/span&gt; million) under the 2020
ATM Facility, none of which has been sold to date.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;i&gt;Equity
Line Common Stock Purchase Agreements&lt;/i&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;On
October 24, 2019, the Company entered into a common stock purchase agreement with Aspire Capital which provided that, subject to certain
terms, conditions and limitations, Aspire Capital was committed to purchase up to an aggregate of $&lt;span id="xdx_902_ecustom--StockIssuedDuringPeriodValueIssuedForCommitmentFee_pn5n6_c20191023__20191024__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember__srt--RangeAxis__srt--MaximumMember_zgtUWceEB0Q8" title="Aggregate purchase of common stock"&gt;10.0&lt;/span&gt; million shares of the Company&#x2019;s
common stock over a 30-month period. Through September 18, 2020, the Company had sold an aggregate of &lt;span id="xdx_909_eus-gaap--SaleOfStockNumberOfSharesIssuedInTransaction_pid_c20200914__20200918__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_zJuEfYsjX7Fc" title="Number of common stock shares sold"&gt;6,424,205&lt;/span&gt; shares of common stock
with an aggregate market value of $&lt;span id="xdx_903_eus-gaap--SaleOfStockConsiderationReceivedPerTransaction_pn5n6_c20200914__20200918__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_zbAfuslQKKgl" title="Proceeds from issuance or sale of equity, net of issuance costs"&gt;4.0&lt;/span&gt; million at an average price of $&lt;span id="xdx_90A_eus-gaap--SaleOfStockPricePerShare_iI_pid_c20200918__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_z2PvKI00qNC4" title="Combined purchase price per share"&gt;0.63&lt;/span&gt; per share pursuant to this common stock purchase agreement,
including &lt;span id="xdx_900_eus-gaap--SaleOfStockNumberOfSharesIssuedInTransaction_pid_c20200501__20210430__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementOneMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_zLzAqaMsuZMl" title="Number of common stock shares sold"&gt;5,025,000&lt;/span&gt; shares in fiscal year 2021 with an aggregate market value of $&lt;span id="xdx_902_eus-gaap--SaleOfStockConsiderationReceivedPerTransaction_pn5n6_c20200501__20210430__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementOneMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_zZ2rT7ofQ4hg" title="Proceeds from issuance or sale of equity, net of issuance costs"&gt;2.9&lt;/span&gt; million at an average price of $&lt;span id="xdx_909_eus-gaap--SaleOfStockPricePerShare_iI_pid_c20210430__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementOneMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_zpsbcKPZwiAi" title="Combined purchase price per share"&gt;0.57&lt;/span&gt; per share.
The agreement was fully utilized and terminated on September 18, 2020.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;On
September 18, 2020, the Company entered into a new common stock purchase agreement with Aspire Capital which provided that, subject to
certain terms, conditions and limitations, Aspire Capital was committed to purchase up to an aggregate of $&lt;span id="xdx_90E_ecustom--StockIssuedDuringPeriodValueIssuedForCommitmentFee_pn5n6_c20200914__20200918__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_zvEikLWYvK4d" title="Aggregate purchase of common stock"&gt;12.5&lt;/span&gt; million shares of the
Company&#x2019;s common stock over a 30-month period subject to a limit of &lt;span id="xdx_901_ecustom--PercentageOfOutstandingCommonStockLimitForShareholderApproval_pid_dp_uPure_c20200914__20200918__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_zAWYU80dtFy4" title="Percentage of outstanding common stock"&gt;19.99&lt;/span&gt;% of the outstanding common stock on the date of the agreement
if the price did not exceed a specified price in the agreement. The number of shares the Company could issue within the 19.99% limit
was &lt;span id="xdx_904_ecustom--StockIssuedDuringPeriodSharesCanBeIssuedBasedUponOutstandingPercentage_pid_c20200914__20200918__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_zZxo3TAECS3i" title="Shares can be issued based upon outstanding percentage"&gt;3,722,251&lt;/span&gt; shares without shareholder approval. Shareholder approval was received at the Company&#x2019;s annual meeting of shareholders
on December 23, 2020 for the sale of &lt;span id="xdx_90E_ecustom--NumberOfAdditionalSharesThatCanBeIssuedUponShareholderApproval_pid_c20201222__20201223__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_zw4qynmfrBfi" title="Additional sales of common stock shares sold"&gt;9,864,706&lt;/span&gt; additional shares of common stock to Aspire Capital, which exceeded the &lt;span id="xdx_902_ecustom--PercentageOfOutstandingCommonStockLimitForShareholderApproval_pid_dp_uPure_c20201222__20201223__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_zSefBVri8Fj3" title="Percentage of outstanding common stock"&gt;19.99&lt;/span&gt;% limit of
the outstanding common stock on the date of the agreement. Through January 31, 2022, the Company had sold an aggregate of &lt;span id="xdx_902_eus-gaap--SaleOfStockNumberOfSharesIssuedInTransaction_c20210730__20210731__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_pdd" title="Number of common stock shares sold"&gt;3,722,251&lt;/span&gt; shares
of common stock with an aggregate market value of $&lt;span id="xdx_90D_eus-gaap--SaleOfStockConsiderationReceivedPerTransaction_c20210730__20210731__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_pn5n6" title="Proceeds from issuance or sale of equity, net of issuance costs"&gt;11.8&lt;/span&gt; million at an average price of $&lt;span id="xdx_904_eus-gaap--SaleOfStockPricePerShare_iI_pid_c20211031__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_zKVSQQxuzm59" title="Combined purchase price per share"&gt;3.17&lt;/span&gt; per share pursuant to this common stock
purchase agreement with approximately $&lt;span id="xdx_905_eus-gaap--SaleOfStockConsiderationReceivedPerTransaction_pn5n6_c20220130__20220131__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_z5ObdanhfAy8" title="Proceeds from issuance or sale of equity, net of issuance costs"&gt;1.0&lt;/span&gt; million remaining on the facility as of January 31, 2022.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

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    <us-gaap:NetIncomeLoss
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      unitRef="USD">-14800000</us-gaap:NetIncomeLoss>
    <us-gaap:NetCashProvidedByUsedInOperatingActivities
      contextRef="From2021-05-01to2022-01-31"
      decimals="-5"
      unitRef="USD">-15800000</us-gaap:NetCashProvidedByUsedInOperatingActivities>
    <us-gaap:NetCashProvidedByUsedInOperatingActivities
      contextRef="From2020-05-012021-04-30"
      decimals="-5"
      unitRef="USD">-11700000</us-gaap:NetCashProvidedByUsedInOperatingActivities>
    <us-gaap:Cash contextRef="AsOf2022-01-31" decimals="-5" unitRef="USD">63500000</us-gaap:Cash>
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      contextRef="From2019-01-062019-01-07_custom_TwoThousandNinteenATMFacilityMember_custom_AGPAllianceGlobalPartnersMember"
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      unitRef="USD">25000000.0</us-gaap:ProceedsFromIssuanceInitialPublicOffering>
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      decimals="-5"
      unitRef="USD">23400000</us-gaap:SaleOfStockConsiderationReceivedPerTransaction>
    <us-gaap:SaleOfStockPricePerShare
      contextRef="AsOf2019-01-07_custom_TwoThousandNinteenATMFacilityMember_custom_AGPAllianceGlobalPartnersMember"
      decimals="INF"
      unitRef="USDPShares">1.33</us-gaap:SaleOfStockPricePerShare>
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      unitRef="Shares">12342506</us-gaap:SaleOfStockNumberOfSharesIssuedInTransaction>
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      contextRef="From2019-01-062019-01-07_custom_AGPAllianceGlobalPartnersMember"
      decimals="-5"
      unitRef="USD">18700000</us-gaap:SaleOfStockConsiderationReceivedPerTransaction>
    <us-gaap:SaleOfStockPricePerShare
      contextRef="AsOf2019-07-01_custom_AGPAllianceGlobalPartnersMember"
      decimals="INF"
      unitRef="USDPShares">1.51</us-gaap:SaleOfStockPricePerShare>
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      unitRef="USD">800000</OPTT:PaymentOfSalesCommission>
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    <OPTT:ProceedsFromInitialPublicOffering
      contextRef="From2020-11-182020-11-20_custom_TwoThousandTwentyATMFacilityMember_custom_AGPAllianceGlobalPartnersMember"
      decimals="-5"
      unitRef="USD">50000000.0</OPTT:ProceedsFromInitialPublicOffering>
    <us-gaap:SaleOfStockNumberOfSharesIssuedInTransaction
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    <us-gaap:SaleOfStockPricePerShare
      contextRef="AsOf2022-01-31_custom_TwoThousandTwentyATMFacilityMember_custom_AGPAllianceGlobalPartnersMember"
      decimals="INF"
      unitRef="USDPShares">2.91</us-gaap:SaleOfStockPricePerShare>
    <OPTT:PaymentOfSalesCommission
      contextRef="From2021-05-012022-01-31_custom_TwoThousandTwentyATMFacilityMember_custom_AGPAllianceGlobalPartnersMember"
      decimals="-5"
      unitRef="USD">1600000</OPTT:PaymentOfSalesCommission>
    <OPTT:PaymentOfSalesCommission
      contextRef="From2021-05-012022-01-31_custom_TwoThousandTwentyATMFacilityMember"
      decimals="-5"
      unitRef="USD">25000000.0</OPTT:PaymentOfSalesCommission>
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      contextRef="From2021-05-012022-01-31_custom_TwoThousandTwentyATMFacilityMember"
      decimals="-5"
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      contextRef="From2019-10-232019-10-24_custom_StockPurchaseAgreementMember_custom_AspireCapitalFundLLCMember_srt_MaximumMember"
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    <us-gaap:SaleOfStockConsiderationReceivedPerTransaction
      contextRef="From2020-09-142020-09-18_custom_StockPurchaseAgreementMember_custom_AspireCapitalFundLLCMember"
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    <us-gaap:SaleOfStockPricePerShare
      contextRef="AsOf2020-09-18_custom_StockPurchaseAgreementMember_custom_AspireCapitalFundLLCMember"
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      contextRef="AsOf2021-04-30_custom_StockPurchaseAgreementOneMember_custom_AspireCapitalFundLLCMember"
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      contextRef="From2020-09-142020-09-18_custom_StockPurchaseAgreementMember_custom_AspireCapitalFundLLCMember"
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    <OPTT:PercentageOfOutstandingCommonStockLimitForShareholderApproval
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      decimals="INF"
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      decimals="-5"
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    <us-gaap:SignificantAccountingPoliciesTextBlock contextRef="From2021-05-01to2022-01-31">&lt;p id="xdx_80C_eus-gaap--SignificantAccountingPoliciesTextBlock_zDdxXQXSsfD2" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;(2)
&lt;span id="xdx_82F_zJmLXtGm5CU2"&gt;Summary of Significant Accounting Policies&lt;/span&gt;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p id="xdx_84C_eus-gaap--ConsolidationPolicyTextBlock_zBFiVSgwIaz9" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;&lt;i&gt;(a)
&lt;span id="xdx_865_zDBhF8X9gW9c"&gt;Consolidation&lt;/span&gt;&lt;/i&gt;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;The
accompanying consolidated financial statements include the accounts of the Company and its majority-owned subsidiaries. All significant
intercompany balances and transactions have been eliminated in consolidation.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p id="xdx_841_eus-gaap--UseOfEstimates_z7LQTREayaS5" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;&lt;i&gt;(b)
&lt;span id="xdx_86A_zL8LNwapiU0c"&gt;Use of Estimates&lt;/span&gt;&lt;/i&gt;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;The
preparation of the consolidated financial statements requires management of the Company to make a number of estimates and assumptions
relating to the reported amounts of assets and liabilities at the date of the consolidated financial statements and the reported amounts
of revenues and expenses during the period. Significant items subject to such estimates and assumptions include, among other items, valuations,
purchase price allocations and contingent consideration related to business combinations, expected future cash flows including growth
rates, discount rates, terminal values and other assumptions and estimates used to evaluate the recoverability of long-lived assets,
goodwill and other intangible assets and the related amortization methods and periods, estimated costs to complete projects and percentage
of completion of customer contracts for purposes of revenue recognition. Actual results could differ from those estimates.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"/&gt;



&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p id="xdx_84A_eus-gaap--CashAndCashEquivalentsRestrictedCashAndCashEquivalentsPolicy_zN4kSXA5PL1d" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;&lt;i&gt;(c)
&lt;span id="xdx_865_zh6i9EThGaZ2"&gt;Cash, Cash Equivalents, Restricted Cash and Security Agreements&lt;/span&gt;&lt;/i&gt;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;i&gt;Cash
and Cash Equivalents&lt;/i&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;The
Company considers all highly liquid investments with a maturity of three months or less when purchased to be cash equivalents. The Company
invests excess cash in a money market account. The following table summarizes cash and cash equivalents as of January 31, 2022 and April
30, 2021:&lt;/span&gt;&lt;/p&gt;

&lt;p id="xdx_893_eus-gaap--ScheduleOfCashAndCashEquivalentsTableTextBlock_z1g40OImlpYg" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;span id="xdx_8BC_zp9nKkjhsHHl" style="display: none"&gt;Schedule of Cash and Cash Equivalents&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%"&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;January
    31, 2022&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;April
    30, 2021&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="6" style="font: 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;(in
    thousands)&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 64%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Checking
    and savings accounts&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98E_eus-gaap--CashAndCashEquivalentsAtCarryingValue_c20220131__us-gaap--CashAndCashEquivalentsAxis__custom--CheckingAndSavingsAccountsMember_pn3n3" style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right" title="Cash and cash equivalents"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;1,519&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98D_eus-gaap--CashAndCashEquivalentsAtCarryingValue_c20210430__us-gaap--CashAndCashEquivalentsAxis__custom--CheckingAndSavingsAccountsMember_pn3n3" style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right" title="Cash and cash equivalents"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;1,850&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Money
    market account&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_988_eus-gaap--CashAndCashEquivalentsAtCarryingValue_c20220131__us-gaap--CashAndCashEquivalentsAxis__us-gaap--MoneyMarketFundsMember_pn3n3" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Cash and cash equivalents"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;61,935&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_989_eus-gaap--CashAndCashEquivalentsAtCarryingValue_c20210430__us-gaap--CashAndCashEquivalentsAxis__us-gaap--MoneyMarketFundsMember_pn3n3" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Cash and cash equivalents"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;81,178&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_982_eus-gaap--CashAndCashEquivalentsAtCarryingValue_c20220131_pn3n3" style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Cash and cash equivalents"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;63,454&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98E_eus-gaap--CashAndCashEquivalentsAtCarryingValue_c20210430_pn3n3" style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Cash and cash equivalents"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;83,028&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

&lt;p id="xdx_8AA_zetvsuuSeyZf" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;i&gt;Restricted
Cash and Security Agreements&lt;/i&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;The
Company has a letter of credit agreement with Santander Bank, N.A. (&#x201c;Santander&#x201d;). Cash of $&lt;span id="xdx_90E_eus-gaap--Deposits_c20220131__us-gaap--TypeOfArrangementAxis__custom--RestrictedCashAndSecurityAgreementsMember__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--SantanderBankMember__us-gaap--ShortTermDebtTypeAxis__us-gaap--LetterOfCreditMember_pp0p0" title="Deposits"&gt;157,000&lt;/span&gt; is on deposit at Santander
and serves as security for a letter of credit issued by Santander for the lease of warehouse/office space in Monroe Township, New Jersey.
This agreement cannot be extended beyond July 31, 2025 and is cancellable at the discretion of Santander.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Santander
also issued two letters of credit to subsidiaries of Enel Green Power (&#x201c;EGP&#x201d;) pursuant to the Company&#x2019;s contracts with
EGP. The first letter of credit was issued in the amount of $&lt;span id="xdx_906_eus-gaap--LettersOfCreditOutstandingAmount_c20220131__us-gaap--TypeOfArrangementAxis__custom--RestrictedCashAndSecurityAgreementsMember__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--SantanderBankMember__us-gaap--ShortTermDebtTypeAxis__custom--LetterOneMember_pp0p0"&gt;126,000
&lt;/span&gt;&lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;that will be released 12 months after the PB3
PowerBuoy&lt;sup&gt;&#xae; &lt;/sup&gt;(&#x201c;PB3&#x201d;) is fully deployed. The second letter of credit was issued in the amount of $&lt;span id="xdx_90C_eus-gaap--LettersOfCreditOutstandingAmount_c20220131__us-gaap--TypeOfArrangementAxis__custom--RestrictedCashAndSecurityAgreementsMember__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--SantanderBankMember__us-gaap--ShortTermDebtTypeAxis__custom--LetterTwoMember_pp0p0"&gt;645,000
&lt;/span&gt;&lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;and was reduced to $&lt;span id="xdx_908_eus-gaap--LettersOfCreditOutstandingAmount_c20200831__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--SantanderBankMember__us-gaap--ShortTermDebtTypeAxis__custom--LetterTwoMember__us-gaap--AwardDateAxis__custom--AugustTwentyTwentyMember_pp0p0"&gt;323,000
&lt;/span&gt;&lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;in August 2020. The second letter of credit will
be reduced by $&lt;span id="xdx_900_ecustom--LettersOfCreditIssuedAmount_iI_pp0p0_c20220131__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--SantanderBankMember__us-gaap--ShortTermDebtTypeAxis__custom--LetterTwoMember_zBZcN1vaN5D3" title="Letters of credit issued amount"&gt;259,000
&lt;/span&gt;&lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;once the PB3 is fully deployed and passes
final acceptance testing. The remaining restricted amount of $&lt;span id="xdx_901_ecustom--LettersOfCreditIssuedAmount_iI_pp0p0_c20220131__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--SantanderBankMember_zY2nQsgGT38a" title="Letters of credit issued amount"&gt;64,000
&lt;/span&gt;&lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;will be released 12 months after the buoy
is fully deployed.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p id="xdx_89F_eus-gaap--ScheduleOfRestrictedCashAndCashEquivalentsTextBlock_zFgX8DyXBl54" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;The
following table provides a reconciliation of cash, cash equivalents and restricted cash reported within the Consolidated Balance Sheets
that total to the same amounts shown in the Consolidated Statements of Cash Flows.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;span id="xdx_8B1_zzRbhmGQtXKi" style="display: none"&gt;Schedule of Cash and Cash Equivalents and Restricted Cash&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%"&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_499_20220131_zWmhr3VYpfF6" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;January
    31, 2022&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_499_20210430_zeSCmu5tUIAl" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;April
    30, 2021&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="6" style="font: 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;(in
    thousands)&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40E_eus-gaap--CashAndCashEquivalentsAtCarryingValue_iI_pn3n3" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 64%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Cash
    and cash equivalents&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;63,454&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;83,028&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_401_eus-gaap--RestrictedCashCurrent_iI_pn3n3" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Restricted
    cash- short term&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;384&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;384&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40F_eus-gaap--RestrictedCashNoncurrent_iI_pn3n3" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Restricted
    cash- long term&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;222&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;222&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40B_eus-gaap--CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_iI_pn3n3" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="display: none; font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Cash,
    cash equivalents and restricted cash&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;64,060&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;83,634&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

&lt;p id="xdx_8A8_ztfYL56COu66" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p id="xdx_841_eus-gaap--ConcentrationRiskCreditRisk_zLv29a9Vu6D1" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;&lt;i&gt;(d)
&lt;span id="xdx_860_zscMqxtILrm2"&gt;Concentration of Credit Risk&lt;/span&gt;&lt;/i&gt;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Financial
instruments that potentially subject the Company to credit risk consist principally of accounts receivable and cash and cash equivalents.
The Company believes that its current contracts do not represent a risk of collectability on its receivables. The Company invests its
excess cash in a money market account and does not believe that it is exposed to any significant risks related to its cash and money
market accounts. Cash and cash equivalents are also maintained at foreign financial institutions. Cash and cash equivalents in foreign
financial institutions as of January 31, 2022 was $&lt;span id="xdx_901_eus-gaap--CashAndCashEquivalentsAtCarryingValue_c20220131__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--ForeignFinancialInstitutionsMember_pp0p0" title="Cash and Cash Equivalents, at Carrying Value"&gt;30,000&lt;/span&gt;.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"/&gt;



&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p id="xdx_896_eus-gaap--ScheduleOfRevenueByMajorCustomersByReportingSegmentsTableTextBlock_zE4Zaw2bCATl" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;The
table below shows the amount of the Company&#x2019;s revenues derived from customers whose revenues accounted for at least 10% of the
Company&#x2019;s consolidated revenues for at least one of the periods indicated:&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;span id="xdx_8BF_zpKS8GyJEw06" style="display: none"&gt;Schedule of Revenue by Major Customers by Reporting Segments&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%"&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; display: none; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_490_20211101__20220131_ze45TaeFeBRj" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2022&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_493_20201101__20210131_zmg6Jp1On4D9" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2021&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_49C_20210501__20220131_zj0XbYPKsZuj" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2022&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_494_20200501__20210131_zvNGSdxep4g5" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2021&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="6" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Three
    months ended January 31,&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="6" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Nine
    months ended January 31,&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2022&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2021&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2022&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2021&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="6" style="font: 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;(in
    thousands)&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="6" style="font: 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;(in
    thousands)&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_408_eus-gaap--RevenueFromContractWithCustomerExcludingAssessedTax_pn3n3_hus-gaap--ConcentrationRiskByBenchmarkAxis__us-gaap--SalesRevenueNetMember__us-gaap--ConcentrationRiskByTypeAxis__us-gaap--CustomerConcentrationRiskMember__srt--MajorCustomersAxis__custom--EniSPAMember_zki3jOC14VUc" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 36%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Eni
    S.p.A.&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 12%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1017"&gt;&#x2014;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 12%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;34&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 12%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;14&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 12%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;135&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_403_eus-gaap--RevenueFromContractWithCustomerExcludingAssessedTax_pn3n3_hus-gaap--ConcentrationRiskByBenchmarkAxis__us-gaap--SalesRevenueNetMember__us-gaap--ConcentrationRiskByTypeAxis__us-gaap--CustomerConcentrationRiskMember__srt--MajorCustomersAxis__custom--DepartmentOfEnergyMember_zj3dzoPzdQ4e" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Department
    of Energy&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;102&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1023"&gt;&#x2014;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;182&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1025"&gt;&#x2014;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_402_eus-gaap--RevenueFromContractWithCustomerExcludingAssessedTax_pn3n3_hus-gaap--ConcentrationRiskByBenchmarkAxis__us-gaap--SalesRevenueNetMember__us-gaap--ConcentrationRiskByTypeAxis__us-gaap--CustomerConcentrationRiskMember__srt--MajorCustomersAxis__custom--EGPMember_zajw0pFUuPlk" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;EGP&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1027"&gt;&#x2014;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;223&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;163&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;379&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_406_eus-gaap--RevenueFromContractWithCustomerExcludingAssessedTax_pn3n3_hus-gaap--ConcentrationRiskByBenchmarkAxis__us-gaap--SalesRevenueNetMember__us-gaap--ConcentrationRiskByTypeAxis__us-gaap--CustomerConcentrationRiskMember__srt--MajorCustomersAxis__custom--ACETMember_zGXHpKdgpmu2" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;ACET&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1032"&gt;&#x2014;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;33&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1034"&gt;&#x2014;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;37&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_406_eus-gaap--RevenueFromContractWithCustomerExcludingAssessedTax_pn3n3_hus-gaap--ConcentrationRiskByBenchmarkAxis__us-gaap--SalesRevenueNetMember__us-gaap--ConcentrationRiskByTypeAxis__us-gaap--CustomerConcentrationRiskMember__srt--MajorCustomersAxis__custom--ValarisFNIMember_zGv69smIwPYb" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Valaris
    &lt;span id="xdx_F47_zN36To1z5lo6"&gt;(1)&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;7&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1038"&gt;&#x2014;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;142&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1040"&gt;&#x2014;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_405_eus-gaap--RevenueFromContractWithCustomerExcludingAssessedTax_pn3n3_hus-gaap--ConcentrationRiskByBenchmarkAxis__us-gaap--SalesRevenueNetMember__us-gaap--ConcentrationRiskByTypeAxis__us-gaap--CustomerConcentrationRiskMember__srt--MajorCustomersAxis__custom--BrighamYoungUniversityMember_zB91P7eS4Nll" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Brigham
    Young University &lt;span id="xdx_F5E_zVuXMILQPuSi"&gt;(2)&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;66&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1043"&gt;&#x2014;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;66&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1045"&gt;&#x2014;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_407_eus-gaap--RevenueFromContractWithCustomerExcludingAssessedTax_pn3n3_hus-gaap--ConcentrationRiskByBenchmarkAxis__us-gaap--SalesRevenueNetMember__us-gaap--ConcentrationRiskByTypeAxis__us-gaap--CustomerConcentrationRiskMember__srt--MajorCustomersAxis__custom--NipponKaiyoMember_zB2to4fwMr6e" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Nippon
    Kaiyo &lt;span id="xdx_F49_z1y4V90JpmDd"&gt;(2)&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;78&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1048"&gt;&#x2014;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;78&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1050"&gt;&#x2014;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40A_eus-gaap--RevenueFromContractWithCustomerExcludingAssessedTax_pn3n3_hus-gaap--ConcentrationRiskByBenchmarkAxis__us-gaap--SalesRevenueNetMember__us-gaap--ConcentrationRiskByTypeAxis__us-gaap--CustomerConcentrationRiskMember__srt--MajorCustomersAxis__custom--NavalSurfaceWarfareCenterMember_zlqYIer8uzHa" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Naval
    Surface Warfare Center &lt;span id="xdx_F42_zFJYGlZukXIh"&gt;(2)&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;98&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1053"&gt;&#x2014;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;98&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1055"&gt;&#x2014;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_404_eus-gaap--RevenueFromContractWithCustomerExcludingAssessedTax_pn3n3_hus-gaap--ConcentrationRiskByBenchmarkAxis__us-gaap--SalesRevenueNetMember__us-gaap--ConcentrationRiskByTypeAxis__us-gaap--CustomerConcentrationRiskMember__srt--MajorCustomersAxis__custom--OtherMember_zUrHidpm8dM" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Other
    (no customer over 10%)&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;133&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;27&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;260&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;53&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_409_eus-gaap--RevenueFromContractWithCustomerExcludingAssessedTax_pn3n3_z5v4hi74KIla" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="display: none; font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Revenues&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;484&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;317&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;1,003&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;604&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;


&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse"&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; padding-right: 2.65pt; text-align: right; width: 40%"&gt;&lt;span id="xdx_F04_zZURkolW8eg4" style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;(1)&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; padding-right: 0.75pt; padding-left: 2.65pt; width: 60%"&gt;&lt;span id="xdx_F1C_zMbXUlposoBd" style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;3Dent
    related consulting&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: #CCEEFF"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; padding-right: 2.65pt; text-align: right"&gt;&lt;span id="xdx_F0C_ztPx7WLQvE09" style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;(2)&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; padding-right: 0.75pt; padding-left: 2.65pt"&gt;&lt;span id="xdx_F12_zM9DZUJLvCT" style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;MAR
    related sales&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;
&lt;p id="xdx_8A2_zpoEBfu5dakd" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;&#160;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p id="xdx_849_eus-gaap--ShareBasedCompensationOptionAndIncentivePlansPolicy_zuPdUUyPHCpd" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;&lt;i&gt;(e)
&lt;span id="xdx_86E_zrwZKoyPUhQ5"&gt;Share-Based Compensation&lt;/span&gt;&lt;/i&gt;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Costs
resulting from all share-based payment transactions are recognized in the consolidated financial statements at their fair values. The
following table summarizes share-based compensation related to the Company&#x2019;s share-based plans by expense category for the three
and nine months ended January 31, 2022 and 2021:&lt;/span&gt;&lt;/p&gt;

&lt;p id="xdx_89D_eus-gaap--ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock_zD5DdwwOJ1E2" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;span id="xdx_8BF_z6z14Asmywua" style="display: none"&gt;Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%"&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; display: none; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_490_20211101__20220131_zM38mo2OlH5f" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2022&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_499_20201101__20210131_zMssRT7iesNd" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2021&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_49E_20210501__20220131_zTxQZQcs4WT" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2022&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_492_20200501__20210131_zc9oIRozsqsh" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2021&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="6" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Three
    months ended January 31,&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="6" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Nine
    months ended January 31,&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2022&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2021&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2022&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2021&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="6" style="font: 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;(in
    thousands)&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="6" style="font: 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;(in
    thousands)&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_408_eus-gaap--ShareBasedCompensation_hus-gaap--IncomeStatementLocationAxis__custom--EngineeringAndProductDevelopmentMember_zHoaC2eo4ba1" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 36%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Engineering
    and product development&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 12%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;209&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 12%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;32&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 12%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;551&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 12%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;91&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40D_eus-gaap--ShareBasedCompensation_hus-gaap--IncomeStatementLocationAxis__us-gaap--SellingGeneralAndAdministrativeExpensesMember_zxINEzOp9n77" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Selling,
    general and administrative&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;108&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;83&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;313&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;247&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_403_eus-gaap--ShareBasedCompensation_i_pn3n3" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Total
    share-based compensation expense&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;317&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;115&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;864&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;338&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

&lt;p id="xdx_8AE_zUTay3HR9Vs4" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p id="xdx_844_eus-gaap--RevenueFromContractWithCustomerPolicyTextBlock_zrwrCS2Zd6D7" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;(f)
&lt;i&gt;&lt;span id="xdx_869_z0nOgDU7qY93"&gt;Revenue Recognition&lt;/span&gt;&lt;/i&gt;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;A
performance obligation is the unit of account for revenue recognition. The Company assesses the goods or services promised in a contract
with a customer and identifies as a performance obligation either: a) a good or service (or a bundle of goods or services) that is distinct;
or b) a series of distinct goods or services that are substantially the same and that have the same pattern of transfer to the customer.
A contract may contain a single or multiple performance obligations. For contracts with multiple performance obligations, the Company
allocates the contracted transaction price to each performance obligation based upon the relative standalone selling price, which represents
the price the Company would sell a promised good or service separately to a customer. The Company determines the standalone selling price
based upon the facts and circumstances of each obligated good or service. The majority of the Company&#x2019;s contracts have no observable
standalone selling price since the associated products and services are customized to customer specifications. As such, the standalone
selling price generally reflects the Company&#x2019;s forecast of the total cost to satisfy the performance obligation plus an appropriate
profit margin.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;The
nature of the Company&#x2019;s contracts may give rise to several types of variable consideration, including unpriced change orders and
liquidated damages and penalties. Variable consideration can also arise from modifications to the scope of services. Variable consideration
is included in the transaction price to the extent it is probable that a significant reversal of cumulative revenue recognized will not
occur once the uncertainty associated with the variable consideration is resolved. Our estimates of variable consideration and determination
of whether to include such amounts in the transaction price are based largely on our assessment of legal enforceability, performance,
and any other information (historical, current, and forecasted) that is reasonably available to us. There was no variable consideration
as of January 31, 2022 or 2021. The Company presents shipping and handling costs, that occur after control of the promised goods or services
transfer to the customer, as fulfillment costs rather than evaluating whether the shipping and handling activities are promised services
to the customer.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"/&gt;



&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;The
Company recognizes revenue when or as it satisfies a performance obligation by transferring a good or service to a customer, either (1)
at a point in time or (2) over time. A good or service is transferred when, or as, the customer obtains control. The evaluation of whether
control of each performance obligation is transferred at a point in time or over time is made at contract inception. Input measures such
as costs incurred or time elapsed are utilized to assess progress against specific contractual performance obligations for the Company&#x2019;s
services. The selection of the method to measure progress towards completion requires judgment and is based on the nature of the services
to be provided. For the Company, the input method using costs incurred or time elapsed best represents the measure of progress against
the performance obligations incorporated within the contractual agreements. If estimated total costs on any contract project a loss,
the Company charges the entire estimated loss to operations in the period the loss becomes known. The cumulative effect of revisions
to revenue, estimated costs to complete contracts, including penalties, incentive awards, change orders, claims, anticipated losses,
and others are recorded in the accounting period in which the events indicating a loss are known and the loss can be reasonably estimated.
These loss projects are re-assessed for each subsequent reporting period until the project is complete. Such revisions could occur at
any time and the effects may be material.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;The
Company&#x2019;s contracts are either cost plus or fixed price contracts. Under cost plus contracts, customers are billed for actual expenses
incurred plus an agreed-upon fee. Under cost plus contracts, a profit or loss on a project is recognized depending on whether actual
costs are more or less than the agreed upon amount.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;The
Company has two types of fixed price contracts, firm fixed price and cost-sharing. Under firm fixed price contracts, the Company receives
an agreed-upon amount for providing products and services specified in the contract, and a profit or loss is recognized depending on
whether actual costs are more or less than the agreed upon amount. Under cost-sharing contracts, the fixed amount agreed upon with the
customer is only intended to fund a portion of the costs on a specific project. Under cost sharing contracts, an amount corresponding
to the revenue is recorded in cost of revenues, resulting in gross profit on these contracts of zero. The Company&#x2019;s share of the
costs is recorded as product development expense. The Company reports its disaggregation of revenue by contract type since this method
best represents the Company&#x2019;s business. For the nine-month periods ended January 31, 2022 and 2021, all of the Company&#x2019;s
contracts were classified as firm fixed price.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;As
of January 31, 2022, the Company&#x2019;s total remaining performance obligations, also referred to as backlog, totaled $&lt;span id="xdx_908_eus-gaap--RevenueRemainingPerformanceObligation_iI_pn5n6_c20220131_zPQxAxDAE4c2" title="Revenue remaining performance obligation"&gt;0.8&lt;/span&gt; million.
The Company expects to recognize &lt;span id="xdx_900_ecustom--RevenueRemainingPerformancesObligationPercentage_pid_dp_uPure_c20210501__20220131_zLCFe6fEpFU8" title="Revenue remaining performance obligation, percentage"&gt;100&lt;/span&gt;% of the remaining performance obligations as revenue over the next twelve months.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;The
Company also enters into lease arrangements for its PB3 and our Wave Adaptive Modular Vessels (&#x201c;WAM-V&#x201d;) with certain customers.
Revenue related to multiple-element arrangements is allocated to lease and non-lease elements based on their relative standalone selling
prices or expected cost plus a margin approach. Lease elements generally include a PB3 and components, while non-lease elements generally
include engineering, monitoring and support services. In the lease arrangement, the customer is provided an option to extend the lease
term or purchase the leased PB3 at some point during and/or at the end of the lease term.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;i&gt;Products
and Solutions Leasing&lt;/i&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;The
Company enters into lease arrangements with certain customers for their products and solutions. As of January 31, 2022, the Company had
one lease arrangement with a remaining operating lease term of less than 7 months. Revenue related to multiple-element arrangements is
allocated to lease and non-lease elements based on their relative standalone selling prices or expected cost plus a margin approach.
Lease elements generally include a PB3 and components, while non-lease elements generally include engineering, monitoring and support
services. In the lease arrangement, the customer is provided an option to extend the lease term or purchase the leased PB3 at some point
during and/or at the end of the lease term.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"/&gt;



&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;The
Company classifies leases as either operating or financing in accordance with the authoritative accounting guidance contained within
ASC Topic 842, &lt;i&gt;&#x201c;Leases&#x201d;.&lt;/i&gt; At inception of the contract, the Company evaluates the lease against the lease classification
criteria within ASC Topic 842. If the direct financing or sales-type classification criteria are met, then the lease is accounted for
as a finance lease. All other leases are treated as operating leases.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;The
Company recognizes revenue from operating lease arrangements generally on a straight-line basis over the lease term which is presented
in Revenues in the Consolidated Statements of Operations. The lease revenue for the nine months ended January 31, 2022 and 2021 was immaterial.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p id="xdx_84E_eus-gaap--EarningsPerSharePolicyTextBlock_zZvX1ipIWb21" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;&lt;i&gt;(g)
&lt;span id="xdx_868_znU2KJI53lPd"&gt;Net Loss per Common Share&lt;/span&gt;&lt;/i&gt;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Basic
and diluted net loss per common share for all periods presented is computed by dividing net loss by the weighted average number of shares
of common stock and common stock equivalents outstanding during the periods. The pre-funded warrants were determined to be common stock
equivalents and have been included in the weighted average number of shares outstanding for calculation of basic net loss per common
share . Due to the Company&#x2019;s net losses, potentially dilutive securities, consisting of options to purchase shares of common stock,
warrants on common stock and unvested restricted stock issued to employees and non-employee directors, were excluded from the diluted
net loss per common share calculation due to their anti-dilutive effect.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;In
computing diluted net loss per common share on the Consolidated Statements of Operations, warrants exercisable for common stock, options
to purchase shares of common stock and non-vested restricted stock issued to employees and non-employee directors, totaling &lt;span id="xdx_909_eus-gaap--AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_c20210501__20220131_pdd" title="Antidilutive securities excluded from computation of earnings per share, amount"&gt;6,356,123&lt;/span&gt;
and &lt;span id="xdx_90F_eus-gaap--AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_c20200501__20210131_pdd" title="Antidilutive securities excluded from computation of earnings per share, amount"&gt;5,221,258&lt;/span&gt; for the nine months ended January 31, 2022 and 2021, respectively, were excluded from each of the computations as the effect
would be anti-dilutive due to the Company&#x2019;s net losses.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p id="xdx_84E_eus-gaap--NewAccountingPronouncementsPolicyPolicyTextBlock_zjFZOjb69SVc" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;&lt;i&gt;(h)
&lt;span id="xdx_867_zg3Bffmmat3d"&gt;Recently Issued Accounting Standards&lt;/span&gt;&lt;/i&gt;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;In
June 2016, the Financial Accounting Standards Board (&#x201c;FASB&#x201d;) issued ASU No. 2016-13, &#x201c;&lt;i&gt;Financial Instruments &lt;/i&gt;-
&lt;i&gt;Credit Losses (Topic 326), Measurement of Credit Losses on Financial Instruments.&#x201d; &lt;/i&gt;This amendment replaces the incurred
loss impairment methodology in current GAAP with a methodology that reflects expected credit losses on instruments within its scope,
including trade receivables. This update is intended to provide financial statement users with more decision-useful information about
the expected credit losses. In November 2019, the FASB issued No. 2019-10, &lt;i&gt;Financial Instruments&#x2014;Credit Losses (Topic 326),
Derivatives and Hedging (Topic 815), and Leases (Topic 842)&lt;/i&gt;, which deferred the effective date of ASU 2016-13 for Smaller Reporting
Companies for fiscal years beginning after December 15, 2022, including interim periods within those fiscal years. The Company is
currently evaluating the impact of the adoption of ASU 2016-13 on its consolidated financial statements.&lt;/span&gt;&lt;/p&gt;

&lt;p id="xdx_853_zsQeUyeZ5Ko5" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

</us-gaap:SignificantAccountingPoliciesTextBlock>
    <us-gaap:ConsolidationPolicyTextBlock contextRef="From2021-05-01to2022-01-31">&lt;p id="xdx_84C_eus-gaap--ConsolidationPolicyTextBlock_zBFiVSgwIaz9" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;&lt;i&gt;(a)
&lt;span id="xdx_865_zDBhF8X9gW9c"&gt;Consolidation&lt;/span&gt;&lt;/i&gt;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;The
accompanying consolidated financial statements include the accounts of the Company and its majority-owned subsidiaries. All significant
intercompany balances and transactions have been eliminated in consolidation.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

</us-gaap:ConsolidationPolicyTextBlock>
    <us-gaap:UseOfEstimates contextRef="From2021-05-01to2022-01-31">&lt;p id="xdx_841_eus-gaap--UseOfEstimates_z7LQTREayaS5" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;&lt;i&gt;(b)
&lt;span id="xdx_86A_zL8LNwapiU0c"&gt;Use of Estimates&lt;/span&gt;&lt;/i&gt;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;The
preparation of the consolidated financial statements requires management of the Company to make a number of estimates and assumptions
relating to the reported amounts of assets and liabilities at the date of the consolidated financial statements and the reported amounts
of revenues and expenses during the period. Significant items subject to such estimates and assumptions include, among other items, valuations,
purchase price allocations and contingent consideration related to business combinations, expected future cash flows including growth
rates, discount rates, terminal values and other assumptions and estimates used to evaluate the recoverability of long-lived assets,
goodwill and other intangible assets and the related amortization methods and periods, estimated costs to complete projects and percentage
of completion of customer contracts for purposes of revenue recognition. Actual results could differ from those estimates.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"/&gt;



&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

</us-gaap:UseOfEstimates>
    <us-gaap:CashAndCashEquivalentsRestrictedCashAndCashEquivalentsPolicy contextRef="From2021-05-01to2022-01-31">&lt;p id="xdx_84A_eus-gaap--CashAndCashEquivalentsRestrictedCashAndCashEquivalentsPolicy_zN4kSXA5PL1d" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;&lt;i&gt;(c)
&lt;span id="xdx_865_zh6i9EThGaZ2"&gt;Cash, Cash Equivalents, Restricted Cash and Security Agreements&lt;/span&gt;&lt;/i&gt;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;i&gt;Cash
and Cash Equivalents&lt;/i&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;The
Company considers all highly liquid investments with a maturity of three months or less when purchased to be cash equivalents. The Company
invests excess cash in a money market account. The following table summarizes cash and cash equivalents as of January 31, 2022 and April
30, 2021:&lt;/span&gt;&lt;/p&gt;

&lt;p id="xdx_893_eus-gaap--ScheduleOfCashAndCashEquivalentsTableTextBlock_z1g40OImlpYg" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;span id="xdx_8BC_zp9nKkjhsHHl" style="display: none"&gt;Schedule of Cash and Cash Equivalents&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%"&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;January
    31, 2022&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;April
    30, 2021&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="6" style="font: 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;(in
    thousands)&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 64%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Checking
    and savings accounts&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98E_eus-gaap--CashAndCashEquivalentsAtCarryingValue_c20220131__us-gaap--CashAndCashEquivalentsAxis__custom--CheckingAndSavingsAccountsMember_pn3n3" style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right" title="Cash and cash equivalents"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;1,519&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98D_eus-gaap--CashAndCashEquivalentsAtCarryingValue_c20210430__us-gaap--CashAndCashEquivalentsAxis__custom--CheckingAndSavingsAccountsMember_pn3n3" style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right" title="Cash and cash equivalents"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;1,850&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Money
    market account&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_988_eus-gaap--CashAndCashEquivalentsAtCarryingValue_c20220131__us-gaap--CashAndCashEquivalentsAxis__us-gaap--MoneyMarketFundsMember_pn3n3" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Cash and cash equivalents"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;61,935&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_989_eus-gaap--CashAndCashEquivalentsAtCarryingValue_c20210430__us-gaap--CashAndCashEquivalentsAxis__us-gaap--MoneyMarketFundsMember_pn3n3" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Cash and cash equivalents"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;81,178&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_982_eus-gaap--CashAndCashEquivalentsAtCarryingValue_c20220131_pn3n3" style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Cash and cash equivalents"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;63,454&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98E_eus-gaap--CashAndCashEquivalentsAtCarryingValue_c20210430_pn3n3" style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Cash and cash equivalents"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;83,028&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

&lt;p id="xdx_8AA_zetvsuuSeyZf" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;i&gt;Restricted
Cash and Security Agreements&lt;/i&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;The
Company has a letter of credit agreement with Santander Bank, N.A. (&#x201c;Santander&#x201d;). Cash of $&lt;span id="xdx_90E_eus-gaap--Deposits_c20220131__us-gaap--TypeOfArrangementAxis__custom--RestrictedCashAndSecurityAgreementsMember__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--SantanderBankMember__us-gaap--ShortTermDebtTypeAxis__us-gaap--LetterOfCreditMember_pp0p0" title="Deposits"&gt;157,000&lt;/span&gt; is on deposit at Santander
and serves as security for a letter of credit issued by Santander for the lease of warehouse/office space in Monroe Township, New Jersey.
This agreement cannot be extended beyond July 31, 2025 and is cancellable at the discretion of Santander.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Santander
also issued two letters of credit to subsidiaries of Enel Green Power (&#x201c;EGP&#x201d;) pursuant to the Company&#x2019;s contracts with
EGP. The first letter of credit was issued in the amount of $&lt;span id="xdx_906_eus-gaap--LettersOfCreditOutstandingAmount_c20220131__us-gaap--TypeOfArrangementAxis__custom--RestrictedCashAndSecurityAgreementsMember__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--SantanderBankMember__us-gaap--ShortTermDebtTypeAxis__custom--LetterOneMember_pp0p0"&gt;126,000
&lt;/span&gt;&lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;that will be released 12 months after the PB3
PowerBuoy&lt;sup&gt;&#xae; &lt;/sup&gt;(&#x201c;PB3&#x201d;) is fully deployed. The second letter of credit was issued in the amount of $&lt;span id="xdx_90C_eus-gaap--LettersOfCreditOutstandingAmount_c20220131__us-gaap--TypeOfArrangementAxis__custom--RestrictedCashAndSecurityAgreementsMember__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--SantanderBankMember__us-gaap--ShortTermDebtTypeAxis__custom--LetterTwoMember_pp0p0"&gt;645,000
&lt;/span&gt;&lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;and was reduced to $&lt;span id="xdx_908_eus-gaap--LettersOfCreditOutstandingAmount_c20200831__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--SantanderBankMember__us-gaap--ShortTermDebtTypeAxis__custom--LetterTwoMember__us-gaap--AwardDateAxis__custom--AugustTwentyTwentyMember_pp0p0"&gt;323,000
&lt;/span&gt;&lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;in August 2020. The second letter of credit will
be reduced by $&lt;span id="xdx_900_ecustom--LettersOfCreditIssuedAmount_iI_pp0p0_c20220131__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--SantanderBankMember__us-gaap--ShortTermDebtTypeAxis__custom--LetterTwoMember_zBZcN1vaN5D3" title="Letters of credit issued amount"&gt;259,000
&lt;/span&gt;&lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;once the PB3 is fully deployed and passes
final acceptance testing. The remaining restricted amount of $&lt;span id="xdx_901_ecustom--LettersOfCreditIssuedAmount_iI_pp0p0_c20220131__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--SantanderBankMember_zY2nQsgGT38a" title="Letters of credit issued amount"&gt;64,000
&lt;/span&gt;&lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;will be released 12 months after the buoy
is fully deployed.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p id="xdx_89F_eus-gaap--ScheduleOfRestrictedCashAndCashEquivalentsTextBlock_zFgX8DyXBl54" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;The
following table provides a reconciliation of cash, cash equivalents and restricted cash reported within the Consolidated Balance Sheets
that total to the same amounts shown in the Consolidated Statements of Cash Flows.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;span id="xdx_8B1_zzRbhmGQtXKi" style="display: none"&gt;Schedule of Cash and Cash Equivalents and Restricted Cash&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%"&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_499_20220131_zWmhr3VYpfF6" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;January
    31, 2022&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_499_20210430_zeSCmu5tUIAl" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;April
    30, 2021&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="6" style="font: 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;(in
    thousands)&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40E_eus-gaap--CashAndCashEquivalentsAtCarryingValue_iI_pn3n3" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 64%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Cash
    and cash equivalents&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;63,454&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;83,028&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_401_eus-gaap--RestrictedCashCurrent_iI_pn3n3" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Restricted
    cash- short term&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;384&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;384&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40F_eus-gaap--RestrictedCashNoncurrent_iI_pn3n3" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Restricted
    cash- long term&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;222&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;222&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40B_eus-gaap--CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_iI_pn3n3" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="display: none; font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Cash,
    cash equivalents and restricted cash&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;64,060&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;83,634&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

&lt;p id="xdx_8A8_ztfYL56COu66" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

</us-gaap:CashAndCashEquivalentsRestrictedCashAndCashEquivalentsPolicy>
    <us-gaap:ScheduleOfCashAndCashEquivalentsTableTextBlock contextRef="From2021-05-01to2022-01-31">&lt;p id="xdx_893_eus-gaap--ScheduleOfCashAndCashEquivalentsTableTextBlock_z1g40OImlpYg" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;span id="xdx_8BC_zp9nKkjhsHHl" style="display: none"&gt;Schedule of Cash and Cash Equivalents&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%"&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;January
    31, 2022&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;April
    30, 2021&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="6" style="font: 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;(in
    thousands)&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 64%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Checking
    and savings accounts&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98E_eus-gaap--CashAndCashEquivalentsAtCarryingValue_c20220131__us-gaap--CashAndCashEquivalentsAxis__custom--CheckingAndSavingsAccountsMember_pn3n3" style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right" title="Cash and cash equivalents"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;1,519&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98D_eus-gaap--CashAndCashEquivalentsAtCarryingValue_c20210430__us-gaap--CashAndCashEquivalentsAxis__custom--CheckingAndSavingsAccountsMember_pn3n3" style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right" title="Cash and cash equivalents"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;1,850&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Money
    market account&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_988_eus-gaap--CashAndCashEquivalentsAtCarryingValue_c20220131__us-gaap--CashAndCashEquivalentsAxis__us-gaap--MoneyMarketFundsMember_pn3n3" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Cash and cash equivalents"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;61,935&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_989_eus-gaap--CashAndCashEquivalentsAtCarryingValue_c20210430__us-gaap--CashAndCashEquivalentsAxis__us-gaap--MoneyMarketFundsMember_pn3n3" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Cash and cash equivalents"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;81,178&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_982_eus-gaap--CashAndCashEquivalentsAtCarryingValue_c20220131_pn3n3" style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Cash and cash equivalents"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;63,454&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98E_eus-gaap--CashAndCashEquivalentsAtCarryingValue_c20210430_pn3n3" style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Cash and cash equivalents"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;83,028&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

</us-gaap:ScheduleOfCashAndCashEquivalentsTableTextBlock>
    <us-gaap:CashAndCashEquivalentsAtCarryingValue
      contextRef="AsOf2022-01-31_custom_CheckingAndSavingsAccountsMember"
      decimals="-3"
      unitRef="USD">1519000</us-gaap:CashAndCashEquivalentsAtCarryingValue>
    <us-gaap:CashAndCashEquivalentsAtCarryingValue
      contextRef="AsOf2021-04-30_custom_CheckingAndSavingsAccountsMember"
      decimals="-3"
      unitRef="USD">1850000</us-gaap:CashAndCashEquivalentsAtCarryingValue>
    <us-gaap:CashAndCashEquivalentsAtCarryingValue
      contextRef="AsOf2022-01-31_us-gaap_MoneyMarketFundsMember"
      decimals="-3"
      unitRef="USD">61935000</us-gaap:CashAndCashEquivalentsAtCarryingValue>
    <us-gaap:CashAndCashEquivalentsAtCarryingValue
      contextRef="AsOf2021-04-30_us-gaap_MoneyMarketFundsMember"
      decimals="-3"
      unitRef="USD">81178000</us-gaap:CashAndCashEquivalentsAtCarryingValue>
    <us-gaap:CashAndCashEquivalentsAtCarryingValue contextRef="AsOf2022-01-31" decimals="-3" unitRef="USD">63454000</us-gaap:CashAndCashEquivalentsAtCarryingValue>
    <us-gaap:CashAndCashEquivalentsAtCarryingValue contextRef="AsOf2021-04-30" decimals="-3" unitRef="USD">83028000</us-gaap:CashAndCashEquivalentsAtCarryingValue>
    <us-gaap:Deposits
      contextRef="AsOf2022-01-31_custom_RestrictedCashAndSecurityAgreementsMember_custom_SantanderBankMember_us-gaap_LetterOfCreditMember"
      decimals="0"
      unitRef="USD">157000</us-gaap:Deposits>
    <us-gaap:LettersOfCreditOutstandingAmount
      contextRef="AsOf2022-01-31_custom_RestrictedCashAndSecurityAgreementsMember_custom_SantanderBankMember_custom_LetterOneMember"
      decimals="0"
      unitRef="USD">126000</us-gaap:LettersOfCreditOutstandingAmount>
    <us-gaap:LettersOfCreditOutstandingAmount
      contextRef="AsOf2022-01-31_custom_RestrictedCashAndSecurityAgreementsMember_custom_SantanderBankMember_custom_LetterTwoMember"
      decimals="0"
      unitRef="USD">645000</us-gaap:LettersOfCreditOutstandingAmount>
    <us-gaap:LettersOfCreditOutstandingAmount
      contextRef="AsOf2020-08-31_custom_SantanderBankMember_custom_LetterTwoMember_custom_AugustTwentyTwentyMember"
      decimals="0"
      unitRef="USD">323000</us-gaap:LettersOfCreditOutstandingAmount>
    <OPTT:LettersOfCreditIssuedAmount
      contextRef="AsOf2022-01-31_custom_SantanderBankMember_custom_LetterTwoMember"
      decimals="0"
      unitRef="USD">259000</OPTT:LettersOfCreditIssuedAmount>
    <OPTT:LettersOfCreditIssuedAmount
      contextRef="AsOf2022-01-31_custom_SantanderBankMember"
      decimals="0"
      unitRef="USD">64000</OPTT:LettersOfCreditIssuedAmount>
    <us-gaap:ScheduleOfRestrictedCashAndCashEquivalentsTextBlock contextRef="From2021-05-01to2022-01-31">&lt;p id="xdx_89F_eus-gaap--ScheduleOfRestrictedCashAndCashEquivalentsTextBlock_zFgX8DyXBl54" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;The
following table provides a reconciliation of cash, cash equivalents and restricted cash reported within the Consolidated Balance Sheets
that total to the same amounts shown in the Consolidated Statements of Cash Flows.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;span id="xdx_8B1_zzRbhmGQtXKi" style="display: none"&gt;Schedule of Cash and Cash Equivalents and Restricted Cash&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%"&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_499_20220131_zWmhr3VYpfF6" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;January
    31, 2022&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_499_20210430_zeSCmu5tUIAl" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;April
    30, 2021&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="6" style="font: 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;(in
    thousands)&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40E_eus-gaap--CashAndCashEquivalentsAtCarryingValue_iI_pn3n3" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 64%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Cash
    and cash equivalents&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;63,454&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;83,028&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_401_eus-gaap--RestrictedCashCurrent_iI_pn3n3" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Restricted
    cash- short term&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;384&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;384&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40F_eus-gaap--RestrictedCashNoncurrent_iI_pn3n3" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Restricted
    cash- long term&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;222&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;222&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40B_eus-gaap--CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_iI_pn3n3" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="display: none; font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Cash,
    cash equivalents and restricted cash&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;64,060&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;83,634&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

</us-gaap:ScheduleOfRestrictedCashAndCashEquivalentsTextBlock>
    <us-gaap:CashAndCashEquivalentsAtCarryingValue contextRef="AsOf2022-01-31" decimals="-3" unitRef="USD">63454000</us-gaap:CashAndCashEquivalentsAtCarryingValue>
    <us-gaap:CashAndCashEquivalentsAtCarryingValue contextRef="AsOf2021-04-30" decimals="-3" unitRef="USD">83028000</us-gaap:CashAndCashEquivalentsAtCarryingValue>
    <us-gaap:RestrictedCashCurrent contextRef="AsOf2022-01-31" decimals="-3" unitRef="USD">384000</us-gaap:RestrictedCashCurrent>
    <us-gaap:RestrictedCashCurrent contextRef="AsOf2021-04-30" decimals="-3" unitRef="USD">384000</us-gaap:RestrictedCashCurrent>
    <us-gaap:RestrictedCashNoncurrent contextRef="AsOf2022-01-31" decimals="-3" unitRef="USD">222000</us-gaap:RestrictedCashNoncurrent>
    <us-gaap:RestrictedCashNoncurrent contextRef="AsOf2021-04-30" decimals="-3" unitRef="USD">222000</us-gaap:RestrictedCashNoncurrent>
    <us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents contextRef="AsOf2022-01-31" decimals="-3" unitRef="USD">64060000</us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents>
    <us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents contextRef="AsOf2021-04-30" decimals="-3" unitRef="USD">83634000</us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents>
    <us-gaap:ConcentrationRiskCreditRisk contextRef="From2021-05-01to2022-01-31">&lt;p id="xdx_841_eus-gaap--ConcentrationRiskCreditRisk_zLv29a9Vu6D1" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;&lt;i&gt;(d)
&lt;span id="xdx_860_zscMqxtILrm2"&gt;Concentration of Credit Risk&lt;/span&gt;&lt;/i&gt;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Financial
instruments that potentially subject the Company to credit risk consist principally of accounts receivable and cash and cash equivalents.
The Company believes that its current contracts do not represent a risk of collectability on its receivables. The Company invests its
excess cash in a money market account and does not believe that it is exposed to any significant risks related to its cash and money
market accounts. Cash and cash equivalents are also maintained at foreign financial institutions. Cash and cash equivalents in foreign
financial institutions as of January 31, 2022 was $&lt;span id="xdx_901_eus-gaap--CashAndCashEquivalentsAtCarryingValue_c20220131__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--ForeignFinancialInstitutionsMember_pp0p0" title="Cash and Cash Equivalents, at Carrying Value"&gt;30,000&lt;/span&gt;.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"/&gt;



&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p id="xdx_896_eus-gaap--ScheduleOfRevenueByMajorCustomersByReportingSegmentsTableTextBlock_zE4Zaw2bCATl" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;The
table below shows the amount of the Company&#x2019;s revenues derived from customers whose revenues accounted for at least 10% of the
Company&#x2019;s consolidated revenues for at least one of the periods indicated:&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;span id="xdx_8BF_zpKS8GyJEw06" style="display: none"&gt;Schedule of Revenue by Major Customers by Reporting Segments&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%"&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; display: none; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_490_20211101__20220131_ze45TaeFeBRj" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2022&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_493_20201101__20210131_zmg6Jp1On4D9" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2021&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_49C_20210501__20220131_zj0XbYPKsZuj" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2022&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_494_20200501__20210131_zvNGSdxep4g5" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2021&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="6" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Three
    months ended January 31,&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="6" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Nine
    months ended January 31,&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2022&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2021&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2022&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2021&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="6" style="font: 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;(in
    thousands)&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="6" style="font: 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;(in
    thousands)&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_408_eus-gaap--RevenueFromContractWithCustomerExcludingAssessedTax_pn3n3_hus-gaap--ConcentrationRiskByBenchmarkAxis__us-gaap--SalesRevenueNetMember__us-gaap--ConcentrationRiskByTypeAxis__us-gaap--CustomerConcentrationRiskMember__srt--MajorCustomersAxis__custom--EniSPAMember_zki3jOC14VUc" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 36%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Eni
    S.p.A.&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 12%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1017"&gt;&#x2014;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 12%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;34&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 12%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;14&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 12%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;135&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_403_eus-gaap--RevenueFromContractWithCustomerExcludingAssessedTax_pn3n3_hus-gaap--ConcentrationRiskByBenchmarkAxis__us-gaap--SalesRevenueNetMember__us-gaap--ConcentrationRiskByTypeAxis__us-gaap--CustomerConcentrationRiskMember__srt--MajorCustomersAxis__custom--DepartmentOfEnergyMember_zj3dzoPzdQ4e" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Department
    of Energy&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;102&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1023"&gt;&#x2014;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;182&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1025"&gt;&#x2014;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_402_eus-gaap--RevenueFromContractWithCustomerExcludingAssessedTax_pn3n3_hus-gaap--ConcentrationRiskByBenchmarkAxis__us-gaap--SalesRevenueNetMember__us-gaap--ConcentrationRiskByTypeAxis__us-gaap--CustomerConcentrationRiskMember__srt--MajorCustomersAxis__custom--EGPMember_zajw0pFUuPlk" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;EGP&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1027"&gt;&#x2014;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;223&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;163&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;379&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_406_eus-gaap--RevenueFromContractWithCustomerExcludingAssessedTax_pn3n3_hus-gaap--ConcentrationRiskByBenchmarkAxis__us-gaap--SalesRevenueNetMember__us-gaap--ConcentrationRiskByTypeAxis__us-gaap--CustomerConcentrationRiskMember__srt--MajorCustomersAxis__custom--ACETMember_zGXHpKdgpmu2" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;ACET&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1032"&gt;&#x2014;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;33&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1034"&gt;&#x2014;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;37&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_406_eus-gaap--RevenueFromContractWithCustomerExcludingAssessedTax_pn3n3_hus-gaap--ConcentrationRiskByBenchmarkAxis__us-gaap--SalesRevenueNetMember__us-gaap--ConcentrationRiskByTypeAxis__us-gaap--CustomerConcentrationRiskMember__srt--MajorCustomersAxis__custom--ValarisFNIMember_zGv69smIwPYb" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Valaris
    &lt;span id="xdx_F47_zN36To1z5lo6"&gt;(1)&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;7&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1038"&gt;&#x2014;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;142&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1040"&gt;&#x2014;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_405_eus-gaap--RevenueFromContractWithCustomerExcludingAssessedTax_pn3n3_hus-gaap--ConcentrationRiskByBenchmarkAxis__us-gaap--SalesRevenueNetMember__us-gaap--ConcentrationRiskByTypeAxis__us-gaap--CustomerConcentrationRiskMember__srt--MajorCustomersAxis__custom--BrighamYoungUniversityMember_zB91P7eS4Nll" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Brigham
    Young University &lt;span id="xdx_F5E_zVuXMILQPuSi"&gt;(2)&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;66&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1043"&gt;&#x2014;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;66&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1045"&gt;&#x2014;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_407_eus-gaap--RevenueFromContractWithCustomerExcludingAssessedTax_pn3n3_hus-gaap--ConcentrationRiskByBenchmarkAxis__us-gaap--SalesRevenueNetMember__us-gaap--ConcentrationRiskByTypeAxis__us-gaap--CustomerConcentrationRiskMember__srt--MajorCustomersAxis__custom--NipponKaiyoMember_zB2to4fwMr6e" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Nippon
    Kaiyo &lt;span id="xdx_F49_z1y4V90JpmDd"&gt;(2)&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;78&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1048"&gt;&#x2014;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;78&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1050"&gt;&#x2014;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40A_eus-gaap--RevenueFromContractWithCustomerExcludingAssessedTax_pn3n3_hus-gaap--ConcentrationRiskByBenchmarkAxis__us-gaap--SalesRevenueNetMember__us-gaap--ConcentrationRiskByTypeAxis__us-gaap--CustomerConcentrationRiskMember__srt--MajorCustomersAxis__custom--NavalSurfaceWarfareCenterMember_zlqYIer8uzHa" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Naval
    Surface Warfare Center &lt;span id="xdx_F42_zFJYGlZukXIh"&gt;(2)&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;98&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1053"&gt;&#x2014;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;98&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1055"&gt;&#x2014;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_404_eus-gaap--RevenueFromContractWithCustomerExcludingAssessedTax_pn3n3_hus-gaap--ConcentrationRiskByBenchmarkAxis__us-gaap--SalesRevenueNetMember__us-gaap--ConcentrationRiskByTypeAxis__us-gaap--CustomerConcentrationRiskMember__srt--MajorCustomersAxis__custom--OtherMember_zUrHidpm8dM" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Other
    (no customer over 10%)&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;133&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;27&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;260&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;53&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_409_eus-gaap--RevenueFromContractWithCustomerExcludingAssessedTax_pn3n3_z5v4hi74KIla" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="display: none; font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Revenues&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;484&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;317&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;1,003&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;604&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;


&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse"&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; padding-right: 2.65pt; text-align: right; width: 40%"&gt;&lt;span id="xdx_F04_zZURkolW8eg4" style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;(1)&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; padding-right: 0.75pt; padding-left: 2.65pt; width: 60%"&gt;&lt;span id="xdx_F1C_zMbXUlposoBd" style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;3Dent
    related consulting&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: #CCEEFF"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; padding-right: 2.65pt; text-align: right"&gt;&lt;span id="xdx_F0C_ztPx7WLQvE09" style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;(2)&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; padding-right: 0.75pt; padding-left: 2.65pt"&gt;&lt;span id="xdx_F12_zM9DZUJLvCT" style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;MAR
    related sales&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;
&lt;p id="xdx_8A2_zpoEBfu5dakd" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;&#160;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;

</us-gaap:ConcentrationRiskCreditRisk>
    <us-gaap:CashAndCashEquivalentsAtCarryingValue
      contextRef="AsOf2022-01-31_custom_ForeignFinancialInstitutionsMember"
      decimals="0"
      unitRef="USD">30000</us-gaap:CashAndCashEquivalentsAtCarryingValue>
    <us-gaap:ScheduleOfRevenueByMajorCustomersByReportingSegmentsTableTextBlock contextRef="From2021-05-01to2022-01-31">&lt;p id="xdx_896_eus-gaap--ScheduleOfRevenueByMajorCustomersByReportingSegmentsTableTextBlock_zE4Zaw2bCATl" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;The
table below shows the amount of the Company&#x2019;s revenues derived from customers whose revenues accounted for at least 10% of the
Company&#x2019;s consolidated revenues for at least one of the periods indicated:&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;span id="xdx_8BF_zpKS8GyJEw06" style="display: none"&gt;Schedule of Revenue by Major Customers by Reporting Segments&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%"&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; display: none; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_490_20211101__20220131_ze45TaeFeBRj" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2022&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_493_20201101__20210131_zmg6Jp1On4D9" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2021&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_49C_20210501__20220131_zj0XbYPKsZuj" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2022&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_494_20200501__20210131_zvNGSdxep4g5" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2021&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="6" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Three
    months ended January 31,&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="6" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Nine
    months ended January 31,&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2022&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2021&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2022&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2021&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="6" style="font: 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;(in
    thousands)&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="6" style="font: 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;(in
    thousands)&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_408_eus-gaap--RevenueFromContractWithCustomerExcludingAssessedTax_pn3n3_hus-gaap--ConcentrationRiskByBenchmarkAxis__us-gaap--SalesRevenueNetMember__us-gaap--ConcentrationRiskByTypeAxis__us-gaap--CustomerConcentrationRiskMember__srt--MajorCustomersAxis__custom--EniSPAMember_zki3jOC14VUc" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 36%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Eni
    S.p.A.&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 12%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1017"&gt;&#x2014;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 12%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;34&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 12%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;14&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 12%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;135&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_403_eus-gaap--RevenueFromContractWithCustomerExcludingAssessedTax_pn3n3_hus-gaap--ConcentrationRiskByBenchmarkAxis__us-gaap--SalesRevenueNetMember__us-gaap--ConcentrationRiskByTypeAxis__us-gaap--CustomerConcentrationRiskMember__srt--MajorCustomersAxis__custom--DepartmentOfEnergyMember_zj3dzoPzdQ4e" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Department
    of Energy&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;102&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1023"&gt;&#x2014;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;182&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1025"&gt;&#x2014;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_402_eus-gaap--RevenueFromContractWithCustomerExcludingAssessedTax_pn3n3_hus-gaap--ConcentrationRiskByBenchmarkAxis__us-gaap--SalesRevenueNetMember__us-gaap--ConcentrationRiskByTypeAxis__us-gaap--CustomerConcentrationRiskMember__srt--MajorCustomersAxis__custom--EGPMember_zajw0pFUuPlk" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;EGP&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1027"&gt;&#x2014;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;223&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;163&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;379&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_406_eus-gaap--RevenueFromContractWithCustomerExcludingAssessedTax_pn3n3_hus-gaap--ConcentrationRiskByBenchmarkAxis__us-gaap--SalesRevenueNetMember__us-gaap--ConcentrationRiskByTypeAxis__us-gaap--CustomerConcentrationRiskMember__srt--MajorCustomersAxis__custom--ACETMember_zGXHpKdgpmu2" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;ACET&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1032"&gt;&#x2014;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;33&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1034"&gt;&#x2014;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;37&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_406_eus-gaap--RevenueFromContractWithCustomerExcludingAssessedTax_pn3n3_hus-gaap--ConcentrationRiskByBenchmarkAxis__us-gaap--SalesRevenueNetMember__us-gaap--ConcentrationRiskByTypeAxis__us-gaap--CustomerConcentrationRiskMember__srt--MajorCustomersAxis__custom--ValarisFNIMember_zGv69smIwPYb" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Valaris
    &lt;span id="xdx_F47_zN36To1z5lo6"&gt;(1)&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;7&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1038"&gt;&#x2014;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;142&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1040"&gt;&#x2014;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_405_eus-gaap--RevenueFromContractWithCustomerExcludingAssessedTax_pn3n3_hus-gaap--ConcentrationRiskByBenchmarkAxis__us-gaap--SalesRevenueNetMember__us-gaap--ConcentrationRiskByTypeAxis__us-gaap--CustomerConcentrationRiskMember__srt--MajorCustomersAxis__custom--BrighamYoungUniversityMember_zB91P7eS4Nll" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Brigham
    Young University &lt;span id="xdx_F5E_zVuXMILQPuSi"&gt;(2)&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;66&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1043"&gt;&#x2014;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;66&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1045"&gt;&#x2014;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_407_eus-gaap--RevenueFromContractWithCustomerExcludingAssessedTax_pn3n3_hus-gaap--ConcentrationRiskByBenchmarkAxis__us-gaap--SalesRevenueNetMember__us-gaap--ConcentrationRiskByTypeAxis__us-gaap--CustomerConcentrationRiskMember__srt--MajorCustomersAxis__custom--NipponKaiyoMember_zB2to4fwMr6e" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Nippon
    Kaiyo &lt;span id="xdx_F49_z1y4V90JpmDd"&gt;(2)&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;78&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1048"&gt;&#x2014;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;78&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1050"&gt;&#x2014;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40A_eus-gaap--RevenueFromContractWithCustomerExcludingAssessedTax_pn3n3_hus-gaap--ConcentrationRiskByBenchmarkAxis__us-gaap--SalesRevenueNetMember__us-gaap--ConcentrationRiskByTypeAxis__us-gaap--CustomerConcentrationRiskMember__srt--MajorCustomersAxis__custom--NavalSurfaceWarfareCenterMember_zlqYIer8uzHa" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Naval
    Surface Warfare Center &lt;span id="xdx_F42_zFJYGlZukXIh"&gt;(2)&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;98&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1053"&gt;&#x2014;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;98&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1055"&gt;&#x2014;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_404_eus-gaap--RevenueFromContractWithCustomerExcludingAssessedTax_pn3n3_hus-gaap--ConcentrationRiskByBenchmarkAxis__us-gaap--SalesRevenueNetMember__us-gaap--ConcentrationRiskByTypeAxis__us-gaap--CustomerConcentrationRiskMember__srt--MajorCustomersAxis__custom--OtherMember_zUrHidpm8dM" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Other
    (no customer over 10%)&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;133&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;27&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;260&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;53&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_409_eus-gaap--RevenueFromContractWithCustomerExcludingAssessedTax_pn3n3_z5v4hi74KIla" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="display: none; font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Revenues&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;484&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;317&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;1,003&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;604&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;


&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse"&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; padding-right: 2.65pt; text-align: right; width: 40%"&gt;&lt;span id="xdx_F04_zZURkolW8eg4" style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;(1)&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; padding-right: 0.75pt; padding-left: 2.65pt; width: 60%"&gt;&lt;span id="xdx_F1C_zMbXUlposoBd" style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;3Dent
    related consulting&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: #CCEEFF"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; padding-right: 2.65pt; text-align: right"&gt;&lt;span id="xdx_F0C_ztPx7WLQvE09" style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;(2)&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; padding-right: 0.75pt; padding-left: 2.65pt"&gt;&lt;span id="xdx_F12_zM9DZUJLvCT" style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;MAR
    related sales&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;
</us-gaap:ScheduleOfRevenueByMajorCustomersByReportingSegmentsTableTextBlock>
    <us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
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      unitRef="USD">34000</us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax>
    <us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
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      unitRef="USD">14000</us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax>
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      unitRef="USD">135000</us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax>
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      unitRef="USD">102000</us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax>
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      unitRef="USD">182000</us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax>
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      contextRef="From2020-11-012021-01-31_us-gaap_SalesRevenueNetMember_us-gaap_CustomerConcentrationRiskMember_custom_EGPMember"
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      unitRef="USD">223000</us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax>
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      unitRef="USD">163000</us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax>
    <us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
      contextRef="From2020-05-012021-01-31_us-gaap_SalesRevenueNetMember_us-gaap_CustomerConcentrationRiskMember_custom_EGPMember"
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      unitRef="USD">379000</us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax>
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      contextRef="From2020-11-012021-01-31_us-gaap_SalesRevenueNetMember_us-gaap_CustomerConcentrationRiskMember_custom_ACETMember"
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      unitRef="USD">33000</us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax>
    <us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
      contextRef="From2020-05-012021-01-31_us-gaap_SalesRevenueNetMember_us-gaap_CustomerConcentrationRiskMember_custom_ACETMember"
      decimals="-3"
      unitRef="USD">37000</us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax>
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      contextRef="From2021-05-012022-01-31_us-gaap_SalesRevenueNetMember_us-gaap_CustomerConcentrationRiskMember_custom_NipponKaiyoMember"
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      contextRef="From2021-11-012022-01-31_us-gaap_SalesRevenueNetMember_us-gaap_CustomerConcentrationRiskMember_custom_NavalSurfaceWarfareCenterMember"
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      contextRef="From2021-05-012022-01-31_us-gaap_SalesRevenueNetMember_us-gaap_CustomerConcentrationRiskMember_custom_NavalSurfaceWarfareCenterMember"
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      id="Fact001054"
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      contextRef="From2021-11-012022-01-31_us-gaap_SalesRevenueNetMember_us-gaap_CustomerConcentrationRiskMember_custom_OtherMember"
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    <us-gaap:ShareBasedCompensationOptionAndIncentivePlansPolicy contextRef="From2021-05-01to2022-01-31">&lt;p id="xdx_849_eus-gaap--ShareBasedCompensationOptionAndIncentivePlansPolicy_zuPdUUyPHCpd" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;&lt;i&gt;(e)
&lt;span id="xdx_86E_zrwZKoyPUhQ5"&gt;Share-Based Compensation&lt;/span&gt;&lt;/i&gt;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Costs
resulting from all share-based payment transactions are recognized in the consolidated financial statements at their fair values. The
following table summarizes share-based compensation related to the Company&#x2019;s share-based plans by expense category for the three
and nine months ended January 31, 2022 and 2021:&lt;/span&gt;&lt;/p&gt;

&lt;p id="xdx_89D_eus-gaap--ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock_zD5DdwwOJ1E2" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;span id="xdx_8BF_z6z14Asmywua" style="display: none"&gt;Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%"&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; display: none; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_490_20211101__20220131_zM38mo2OlH5f" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2022&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_499_20201101__20210131_zMssRT7iesNd" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2021&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_49E_20210501__20220131_zTxQZQcs4WT" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2022&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_492_20200501__20210131_zc9oIRozsqsh" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2021&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="6" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Three
    months ended January 31,&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="6" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Nine
    months ended January 31,&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2022&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2021&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2022&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2021&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="6" style="font: 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;(in
    thousands)&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="6" style="font: 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;(in
    thousands)&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_408_eus-gaap--ShareBasedCompensation_hus-gaap--IncomeStatementLocationAxis__custom--EngineeringAndProductDevelopmentMember_zHoaC2eo4ba1" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 36%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Engineering
    and product development&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 12%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;209&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 12%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;32&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 12%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;551&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 12%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;91&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40D_eus-gaap--ShareBasedCompensation_hus-gaap--IncomeStatementLocationAxis__us-gaap--SellingGeneralAndAdministrativeExpensesMember_zxINEzOp9n77" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Selling,
    general and administrative&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;108&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;83&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;313&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;247&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_403_eus-gaap--ShareBasedCompensation_i_pn3n3" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Total
    share-based compensation expense&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;317&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;115&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;864&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;338&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

&lt;p id="xdx_8AE_zUTay3HR9Vs4" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

</us-gaap:ShareBasedCompensationOptionAndIncentivePlansPolicy>
    <us-gaap:ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock contextRef="From2021-05-01to2022-01-31">&lt;p id="xdx_89D_eus-gaap--ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock_zD5DdwwOJ1E2" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;span id="xdx_8BF_z6z14Asmywua" style="display: none"&gt;Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%"&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; display: none; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_490_20211101__20220131_zM38mo2OlH5f" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2022&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_499_20201101__20210131_zMssRT7iesNd" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2021&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_49E_20210501__20220131_zTxQZQcs4WT" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2022&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_492_20200501__20210131_zc9oIRozsqsh" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2021&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="6" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Three
    months ended January 31,&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="6" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Nine
    months ended January 31,&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2022&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2021&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2022&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2021&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="6" style="font: 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;(in
    thousands)&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="6" style="font: 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;(in
    thousands)&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_408_eus-gaap--ShareBasedCompensation_hus-gaap--IncomeStatementLocationAxis__custom--EngineeringAndProductDevelopmentMember_zHoaC2eo4ba1" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 36%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Engineering
    and product development&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 12%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;209&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 12%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;32&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 12%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;551&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 12%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;91&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40D_eus-gaap--ShareBasedCompensation_hus-gaap--IncomeStatementLocationAxis__us-gaap--SellingGeneralAndAdministrativeExpensesMember_zxINEzOp9n77" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Selling,
    general and administrative&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;108&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;83&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;313&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;247&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_403_eus-gaap--ShareBasedCompensation_i_pn3n3" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Total
    share-based compensation expense&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;317&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;115&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;864&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;338&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

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      contextRef="From2021-11-012022-01-31_custom_EngineeringAndProductDevelopmentMember"
      decimals="-3"
      unitRef="USD">209000</us-gaap:ShareBasedCompensation>
    <us-gaap:ShareBasedCompensation
      contextRef="From2020-11-012021-01-31_custom_EngineeringAndProductDevelopmentMember"
      decimals="-3"
      unitRef="USD">32000</us-gaap:ShareBasedCompensation>
    <us-gaap:ShareBasedCompensation
      contextRef="From2021-05-012022-01-31_custom_EngineeringAndProductDevelopmentMember"
      decimals="-3"
      unitRef="USD">551000</us-gaap:ShareBasedCompensation>
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      contextRef="From2020-05-012021-01-31_custom_EngineeringAndProductDevelopmentMember"
      decimals="-3"
      unitRef="USD">91000</us-gaap:ShareBasedCompensation>
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      contextRef="From2021-11-012022-01-31_us-gaap_SellingGeneralAndAdministrativeExpensesMember"
      decimals="-3"
      unitRef="USD">108000</us-gaap:ShareBasedCompensation>
    <us-gaap:ShareBasedCompensation
      contextRef="From2020-11-012021-01-31_us-gaap_SellingGeneralAndAdministrativeExpensesMember"
      decimals="-3"
      unitRef="USD">83000</us-gaap:ShareBasedCompensation>
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      contextRef="From2021-05-012022-01-31_us-gaap_SellingGeneralAndAdministrativeExpensesMember"
      decimals="-3"
      unitRef="USD">313000</us-gaap:ShareBasedCompensation>
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      contextRef="From2020-05-012021-01-31_us-gaap_SellingGeneralAndAdministrativeExpensesMember"
      decimals="-3"
      unitRef="USD">247000</us-gaap:ShareBasedCompensation>
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      contextRef="From2021-11-012022-01-31"
      decimals="-3"
      unitRef="USD">317000</us-gaap:ShareBasedCompensation>
    <us-gaap:ShareBasedCompensation
      contextRef="From2020-11-012021-01-31"
      decimals="-3"
      unitRef="USD">115000</us-gaap:ShareBasedCompensation>
    <us-gaap:ShareBasedCompensation
      contextRef="From2021-05-01to2022-01-31"
      decimals="-3"
      unitRef="USD">864000</us-gaap:ShareBasedCompensation>
    <us-gaap:ShareBasedCompensation
      contextRef="From2020-05-012021-01-31"
      decimals="-3"
      unitRef="USD">338000</us-gaap:ShareBasedCompensation>
    <us-gaap:RevenueFromContractWithCustomerPolicyTextBlock contextRef="From2021-05-01to2022-01-31">&lt;p id="xdx_844_eus-gaap--RevenueFromContractWithCustomerPolicyTextBlock_zrwrCS2Zd6D7" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;(f)
&lt;i&gt;&lt;span id="xdx_869_z0nOgDU7qY93"&gt;Revenue Recognition&lt;/span&gt;&lt;/i&gt;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;A
performance obligation is the unit of account for revenue recognition. The Company assesses the goods or services promised in a contract
with a customer and identifies as a performance obligation either: a) a good or service (or a bundle of goods or services) that is distinct;
or b) a series of distinct goods or services that are substantially the same and that have the same pattern of transfer to the customer.
A contract may contain a single or multiple performance obligations. For contracts with multiple performance obligations, the Company
allocates the contracted transaction price to each performance obligation based upon the relative standalone selling price, which represents
the price the Company would sell a promised good or service separately to a customer. The Company determines the standalone selling price
based upon the facts and circumstances of each obligated good or service. The majority of the Company&#x2019;s contracts have no observable
standalone selling price since the associated products and services are customized to customer specifications. As such, the standalone
selling price generally reflects the Company&#x2019;s forecast of the total cost to satisfy the performance obligation plus an appropriate
profit margin.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;The
nature of the Company&#x2019;s contracts may give rise to several types of variable consideration, including unpriced change orders and
liquidated damages and penalties. Variable consideration can also arise from modifications to the scope of services. Variable consideration
is included in the transaction price to the extent it is probable that a significant reversal of cumulative revenue recognized will not
occur once the uncertainty associated with the variable consideration is resolved. Our estimates of variable consideration and determination
of whether to include such amounts in the transaction price are based largely on our assessment of legal enforceability, performance,
and any other information (historical, current, and forecasted) that is reasonably available to us. There was no variable consideration
as of January 31, 2022 or 2021. The Company presents shipping and handling costs, that occur after control of the promised goods or services
transfer to the customer, as fulfillment costs rather than evaluating whether the shipping and handling activities are promised services
to the customer.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"/&gt;



&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;The
Company recognizes revenue when or as it satisfies a performance obligation by transferring a good or service to a customer, either (1)
at a point in time or (2) over time. A good or service is transferred when, or as, the customer obtains control. The evaluation of whether
control of each performance obligation is transferred at a point in time or over time is made at contract inception. Input measures such
as costs incurred or time elapsed are utilized to assess progress against specific contractual performance obligations for the Company&#x2019;s
services. The selection of the method to measure progress towards completion requires judgment and is based on the nature of the services
to be provided. For the Company, the input method using costs incurred or time elapsed best represents the measure of progress against
the performance obligations incorporated within the contractual agreements. If estimated total costs on any contract project a loss,
the Company charges the entire estimated loss to operations in the period the loss becomes known. The cumulative effect of revisions
to revenue, estimated costs to complete contracts, including penalties, incentive awards, change orders, claims, anticipated losses,
and others are recorded in the accounting period in which the events indicating a loss are known and the loss can be reasonably estimated.
These loss projects are re-assessed for each subsequent reporting period until the project is complete. Such revisions could occur at
any time and the effects may be material.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;The
Company&#x2019;s contracts are either cost plus or fixed price contracts. Under cost plus contracts, customers are billed for actual expenses
incurred plus an agreed-upon fee. Under cost plus contracts, a profit or loss on a project is recognized depending on whether actual
costs are more or less than the agreed upon amount.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;The
Company has two types of fixed price contracts, firm fixed price and cost-sharing. Under firm fixed price contracts, the Company receives
an agreed-upon amount for providing products and services specified in the contract, and a profit or loss is recognized depending on
whether actual costs are more or less than the agreed upon amount. Under cost-sharing contracts, the fixed amount agreed upon with the
customer is only intended to fund a portion of the costs on a specific project. Under cost sharing contracts, an amount corresponding
to the revenue is recorded in cost of revenues, resulting in gross profit on these contracts of zero. The Company&#x2019;s share of the
costs is recorded as product development expense. The Company reports its disaggregation of revenue by contract type since this method
best represents the Company&#x2019;s business. For the nine-month periods ended January 31, 2022 and 2021, all of the Company&#x2019;s
contracts were classified as firm fixed price.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;As
of January 31, 2022, the Company&#x2019;s total remaining performance obligations, also referred to as backlog, totaled $&lt;span id="xdx_908_eus-gaap--RevenueRemainingPerformanceObligation_iI_pn5n6_c20220131_zPQxAxDAE4c2" title="Revenue remaining performance obligation"&gt;0.8&lt;/span&gt; million.
The Company expects to recognize &lt;span id="xdx_900_ecustom--RevenueRemainingPerformancesObligationPercentage_pid_dp_uPure_c20210501__20220131_zLCFe6fEpFU8" title="Revenue remaining performance obligation, percentage"&gt;100&lt;/span&gt;% of the remaining performance obligations as revenue over the next twelve months.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;The
Company also enters into lease arrangements for its PB3 and our Wave Adaptive Modular Vessels (&#x201c;WAM-V&#x201d;) with certain customers.
Revenue related to multiple-element arrangements is allocated to lease and non-lease elements based on their relative standalone selling
prices or expected cost plus a margin approach. Lease elements generally include a PB3 and components, while non-lease elements generally
include engineering, monitoring and support services. In the lease arrangement, the customer is provided an option to extend the lease
term or purchase the leased PB3 at some point during and/or at the end of the lease term.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;i&gt;Products
and Solutions Leasing&lt;/i&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;The
Company enters into lease arrangements with certain customers for their products and solutions. As of January 31, 2022, the Company had
one lease arrangement with a remaining operating lease term of less than 7 months. Revenue related to multiple-element arrangements is
allocated to lease and non-lease elements based on their relative standalone selling prices or expected cost plus a margin approach.
Lease elements generally include a PB3 and components, while non-lease elements generally include engineering, monitoring and support
services. In the lease arrangement, the customer is provided an option to extend the lease term or purchase the leased PB3 at some point
during and/or at the end of the lease term.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"/&gt;



&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;The
Company classifies leases as either operating or financing in accordance with the authoritative accounting guidance contained within
ASC Topic 842, &lt;i&gt;&#x201c;Leases&#x201d;.&lt;/i&gt; At inception of the contract, the Company evaluates the lease against the lease classification
criteria within ASC Topic 842. If the direct financing or sales-type classification criteria are met, then the lease is accounted for
as a finance lease. All other leases are treated as operating leases.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;The
Company recognizes revenue from operating lease arrangements generally on a straight-line basis over the lease term which is presented
in Revenues in the Consolidated Statements of Operations. The lease revenue for the nine months ended January 31, 2022 and 2021 was immaterial.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

</us-gaap:RevenueFromContractWithCustomerPolicyTextBlock>
    <us-gaap:RevenueRemainingPerformanceObligation contextRef="AsOf2022-01-31" decimals="-5" unitRef="USD">800000</us-gaap:RevenueRemainingPerformanceObligation>
    <OPTT:RevenueRemainingPerformancesObligationPercentage
      contextRef="From2021-05-01to2022-01-31"
      decimals="INF"
      unitRef="Pure">1</OPTT:RevenueRemainingPerformancesObligationPercentage>
    <us-gaap:EarningsPerSharePolicyTextBlock contextRef="From2021-05-01to2022-01-31">&lt;p id="xdx_84E_eus-gaap--EarningsPerSharePolicyTextBlock_zZvX1ipIWb21" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;&lt;i&gt;(g)
&lt;span id="xdx_868_znU2KJI53lPd"&gt;Net Loss per Common Share&lt;/span&gt;&lt;/i&gt;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Basic
and diluted net loss per common share for all periods presented is computed by dividing net loss by the weighted average number of shares
of common stock and common stock equivalents outstanding during the periods. The pre-funded warrants were determined to be common stock
equivalents and have been included in the weighted average number of shares outstanding for calculation of basic net loss per common
share . Due to the Company&#x2019;s net losses, potentially dilutive securities, consisting of options to purchase shares of common stock,
warrants on common stock and unvested restricted stock issued to employees and non-employee directors, were excluded from the diluted
net loss per common share calculation due to their anti-dilutive effect.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;In
computing diluted net loss per common share on the Consolidated Statements of Operations, warrants exercisable for common stock, options
to purchase shares of common stock and non-vested restricted stock issued to employees and non-employee directors, totaling &lt;span id="xdx_909_eus-gaap--AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_c20210501__20220131_pdd" title="Antidilutive securities excluded from computation of earnings per share, amount"&gt;6,356,123&lt;/span&gt;
and &lt;span id="xdx_90F_eus-gaap--AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_c20200501__20210131_pdd" title="Antidilutive securities excluded from computation of earnings per share, amount"&gt;5,221,258&lt;/span&gt; for the nine months ended January 31, 2022 and 2021, respectively, were excluded from each of the computations as the effect
would be anti-dilutive due to the Company&#x2019;s net losses.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

</us-gaap:EarningsPerSharePolicyTextBlock>
    <us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
      contextRef="From2021-05-01to2022-01-31"
      decimals="INF"
      unitRef="Shares">6356123</us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount>
    <us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
      contextRef="From2020-05-012021-01-31"
      decimals="INF"
      unitRef="Shares">5221258</us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount>
    <us-gaap:NewAccountingPronouncementsPolicyPolicyTextBlock contextRef="From2021-05-01to2022-01-31">&lt;p id="xdx_84E_eus-gaap--NewAccountingPronouncementsPolicyPolicyTextBlock_zjFZOjb69SVc" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;&lt;i&gt;(h)
&lt;span id="xdx_867_zg3Bffmmat3d"&gt;Recently Issued Accounting Standards&lt;/span&gt;&lt;/i&gt;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;In
June 2016, the Financial Accounting Standards Board (&#x201c;FASB&#x201d;) issued ASU No. 2016-13, &#x201c;&lt;i&gt;Financial Instruments &lt;/i&gt;-
&lt;i&gt;Credit Losses (Topic 326), Measurement of Credit Losses on Financial Instruments.&#x201d; &lt;/i&gt;This amendment replaces the incurred
loss impairment methodology in current GAAP with a methodology that reflects expected credit losses on instruments within its scope,
including trade receivables. This update is intended to provide financial statement users with more decision-useful information about
the expected credit losses. In November 2019, the FASB issued No. 2019-10, &lt;i&gt;Financial Instruments&#x2014;Credit Losses (Topic 326),
Derivatives and Hedging (Topic 815), and Leases (Topic 842)&lt;/i&gt;, which deferred the effective date of ASU 2016-13 for Smaller Reporting
Companies for fiscal years beginning after December 15, 2022, including interim periods within those fiscal years. The Company is
currently evaluating the impact of the adoption of ASU 2016-13 on its consolidated financial statements.&lt;/span&gt;&lt;/p&gt;

</us-gaap:NewAccountingPronouncementsPolicyPolicyTextBlock>
    <OPTT:AccountReceivableContractAssetsAndContractLiabilitiesTextBlock contextRef="From2021-05-01to2022-01-31">&lt;p id="xdx_80B_ecustom--AccountReceivableContractAssetsAndContractLiabilitiesTextBlock_zkx9qyT015w4" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;(3)
&lt;span id="xdx_824_zVP50WQzirT3"&gt;Account Receivable and Contract Assets&lt;/span&gt;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p id="xdx_893_ecustom--ScheduleOfAccountsReceivableContractAssetsAndContractLiabilitiesTableTextBlock_zX37aYccAexj" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;The
following provides further details on the balance sheet accounts of accounts receivable and contract assets from contracts with customers:&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;span id="xdx_8B3_zG1WN85sW172" style="display: none"&gt;Schedule of Accounts Receivable, Contract Assets and Contract Liabilities&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%"&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_496_20220131_zbTa3kmusB2l" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;January
    31, 2022&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_490_20210430_zXcszjs8DfKj" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;April
    30, 2021&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="6" style="font: 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;(in
    thousands)&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_401_eus-gaap--AccountsReceivableNetCurrent_iI_pn3n3" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 64%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Accounts
    receivable&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;113&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;350&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_404_eus-gaap--ContractWithCustomerAssetNetCurrent_iI_pn3n3" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Contract
    assets&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;407&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;190&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40F_eus-gaap--ContractWithCustomerLiabilityCurrent_iI_pn3n3" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Contract
    liabilities&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;15&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1113"&gt;&#x2014;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

&lt;p id="xdx_8A3_z0tmZ0DjSym2" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;i&gt;&#160;&lt;/i&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;i&gt;Accounts
Receivable&lt;/i&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;The
Company grants credit to its customers, generally without collateral, under normal payment terms (typically 30 to 60 days after invoicing).
Generally, invoicing occurs after the related services are performed or control of goods have transferred to the customer. Accounts receivable
represent an unconditional right to consideration arising from the Company&#x2019;s performance under contracts with customers. The carrying
value of such receivables represents their estimated realizable value.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"/&gt;



&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;i&gt;Contract
Assets&lt;/i&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Contract
assets include unbilled amounts typically resulting from arrangements whereby the right to payment is conditioned on completing additional
tasks or services for a performance obligation. Significant changes in the contract assets balance during the period were as follows:&lt;/span&gt;&lt;/p&gt;

&lt;p id="xdx_895_eus-gaap--ContractWithCustomerAssetAndLiabilityTableTextBlock_zu9tO89eHz01" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;span id="xdx_8BC_zY5tgvGeojuj" style="display: none"&gt;Schedule of Significant Changes in Contract Assets and Contract Liabilities&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%"&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_498_20210501__20220131_zwQ2ZRbPzNdl" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Nine
    months ended January 31, 2022&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;(in
    thousands)&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_406_eus-gaap--ContractWithCustomerAssetNet_iNS_pn3n3_di_zRWeyQ6sTHa2" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 78%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Transferred
    to receivables from contract assets recognized at the beginning of the period&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 18%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;(190&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;)&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40A_eus-gaap--ContractWithCustomerAssetNet_iE_pn3n3_zSo6j0097m1c" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Revenue
    recognized and not billed as of the end of the period&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;407&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_401_eus-gaap--IncreaseDecreaseInContractWithCustomerAsset_iT_pn3n3_zsLykBp0ml1h" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Net
    change in contract assets&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;217&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

&lt;p id="xdx_8A2_z3gj4aGrrpEg" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

</OPTT:AccountReceivableContractAssetsAndContractLiabilitiesTextBlock>
    <OPTT:ScheduleOfAccountsReceivableContractAssetsAndContractLiabilitiesTableTextBlock contextRef="From2021-05-01to2022-01-31">&lt;p id="xdx_893_ecustom--ScheduleOfAccountsReceivableContractAssetsAndContractLiabilitiesTableTextBlock_zX37aYccAexj" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;The
following provides further details on the balance sheet accounts of accounts receivable and contract assets from contracts with customers:&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;span id="xdx_8B3_zG1WN85sW172" style="display: none"&gt;Schedule of Accounts Receivable, Contract Assets and Contract Liabilities&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%"&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_496_20220131_zbTa3kmusB2l" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;January
    31, 2022&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_490_20210430_zXcszjs8DfKj" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;April
    30, 2021&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="6" style="font: 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;(in
    thousands)&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_401_eus-gaap--AccountsReceivableNetCurrent_iI_pn3n3" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 64%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Accounts
    receivable&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;113&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;350&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_404_eus-gaap--ContractWithCustomerAssetNetCurrent_iI_pn3n3" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Contract
    assets&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;407&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;190&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40F_eus-gaap--ContractWithCustomerLiabilityCurrent_iI_pn3n3" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Contract
    liabilities&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;15&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1113"&gt;&#x2014;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

</OPTT:ScheduleOfAccountsReceivableContractAssetsAndContractLiabilitiesTableTextBlock>
    <us-gaap:AccountsReceivableNetCurrent contextRef="AsOf2022-01-31" decimals="-3" unitRef="USD">113000</us-gaap:AccountsReceivableNetCurrent>
    <us-gaap:AccountsReceivableNetCurrent contextRef="AsOf2021-04-30" decimals="-3" unitRef="USD">350000</us-gaap:AccountsReceivableNetCurrent>
    <us-gaap:ContractWithCustomerAssetNetCurrent contextRef="AsOf2022-01-31" decimals="-3" unitRef="USD">407000</us-gaap:ContractWithCustomerAssetNetCurrent>
    <us-gaap:ContractWithCustomerAssetNetCurrent contextRef="AsOf2021-04-30" decimals="-3" unitRef="USD">190000</us-gaap:ContractWithCustomerAssetNetCurrent>
    <us-gaap:ContractWithCustomerLiabilityCurrent contextRef="AsOf2022-01-31" decimals="-3" unitRef="USD">15000</us-gaap:ContractWithCustomerLiabilityCurrent>
    <us-gaap:ContractWithCustomerAssetAndLiabilityTableTextBlock contextRef="From2021-05-01to2022-01-31">&lt;p id="xdx_895_eus-gaap--ContractWithCustomerAssetAndLiabilityTableTextBlock_zu9tO89eHz01" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;span id="xdx_8BC_zY5tgvGeojuj" style="display: none"&gt;Schedule of Significant Changes in Contract Assets and Contract Liabilities&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%"&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_498_20210501__20220131_zwQ2ZRbPzNdl" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Nine
    months ended January 31, 2022&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;(in
    thousands)&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_406_eus-gaap--ContractWithCustomerAssetNet_iNS_pn3n3_di_zRWeyQ6sTHa2" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 78%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Transferred
    to receivables from contract assets recognized at the beginning of the period&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 18%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;(190&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;)&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40A_eus-gaap--ContractWithCustomerAssetNet_iE_pn3n3_zSo6j0097m1c" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Revenue
    recognized and not billed as of the end of the period&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;407&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_401_eus-gaap--IncreaseDecreaseInContractWithCustomerAsset_iT_pn3n3_zsLykBp0ml1h" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Net
    change in contract assets&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;217&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

</us-gaap:ContractWithCustomerAssetAndLiabilityTableTextBlock>
    <us-gaap:ContractWithCustomerAssetNet contextRef="AsOf2021-04-30" decimals="-3" unitRef="USD">190000</us-gaap:ContractWithCustomerAssetNet>
    <us-gaap:ContractWithCustomerAssetNet contextRef="AsOf2022-01-31" decimals="-3" unitRef="USD">407000</us-gaap:ContractWithCustomerAssetNet>
    <us-gaap:IncreaseDecreaseInContractWithCustomerAsset
      contextRef="From2021-05-01to2022-01-31"
      decimals="-3"
      unitRef="USD">217000</us-gaap:IncreaseDecreaseInContractWithCustomerAsset>
    <us-gaap:OtherCurrentAssetsTextBlock contextRef="From2021-05-01to2022-01-31">&lt;p id="xdx_80E_eus-gaap--OtherCurrentAssetsTextBlock_zxbOhOnsA2tl" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;(4)
&lt;span id="xdx_82E_zWWy2HdMU7Qf"&gt;Other Current Assets&lt;/span&gt;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;&#160;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p id="xdx_894_eus-gaap--ScheduleOfOtherCurrentAssetsTableTextBlock_zOb9oIGBliWe" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Other
current assets consisted of the following at January 31, 2022 and April 30, 2021:&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;span id="xdx_8BE_zUQHnlgidtGh" style="display: none"&gt;Schedule of Other Current Assets&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%"&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_499_20220131_zyvdMlf294i6" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;January
    31, 2022&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_49C_20210430_z7mboLLDyuFi" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;April
    30, 2021&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="6" style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;(in
    thousands)&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_402_eus-gaap--PrepaidInsurance_iI_pn3n3_maOACz300_z2YxsIiPOxw3" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 64%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Prepaid
    insurance&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right"&gt;&#160;&#160;&#160;&#160;&#160;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;178&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right"&gt;&#160;&#160;&#160;&#160;&#160;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;194&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40A_ecustom--PrepaidSoftwareAndLicenses_pn3n3_maOACz300_zwqT8UeANQWd" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Prepaid
    software &amp;amp; licenses&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;84&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;93&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40B_ecustom--PrepaidSalesAndMarketing_pn3n3_maOACz300_z6yjFlOmwoOk" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Prepaid
    sales and marketing&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;65&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;37&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40D_ecustom--PrepaidRecruitingAndHR_iI_pn3n3_maOACz300_zAWlyggL0ss8" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Prepaid
    recruiting&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;57&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;12&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40B_eus-gaap--OtherReceivablesNetCurrent_iI_pn3n3_maOACz300_zWglV7NUVXuc" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Other
    receivables&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;24&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;21&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_407_eus-gaap--DepositsAssetsCurrent_iI_pn3n3_maOACz300_z3KzRt7HPdg4" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Deposits&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1142"&gt;&#x2014;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;68&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40F_eus-gaap--OtherPrepaidExpenseCurrent_iI_pn3n3_maOACz300_zig9OVKS7AMg" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Prepaid
    expenses- other&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;28&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;62&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_409_eus-gaap--OtherAssetsCurrent_iTI_pn3n3_mtOACz300_zE8SwhsDxjF8" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="display: none; font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Other
    current assets&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;436&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;487&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

&lt;p id="xdx_8AE_z8L9gmvO25Pg" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

</us-gaap:OtherCurrentAssetsTextBlock>
    <us-gaap:ScheduleOfOtherCurrentAssetsTableTextBlock contextRef="From2021-05-01to2022-01-31">&lt;p id="xdx_894_eus-gaap--ScheduleOfOtherCurrentAssetsTableTextBlock_zOb9oIGBliWe" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Other
current assets consisted of the following at January 31, 2022 and April 30, 2021:&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;span id="xdx_8BE_zUQHnlgidtGh" style="display: none"&gt;Schedule of Other Current Assets&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%"&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_499_20220131_zyvdMlf294i6" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;January
    31, 2022&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_49C_20210430_z7mboLLDyuFi" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;April
    30, 2021&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="6" style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;(in
    thousands)&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_402_eus-gaap--PrepaidInsurance_iI_pn3n3_maOACz300_z2YxsIiPOxw3" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 64%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Prepaid
    insurance&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right"&gt;&#160;&#160;&#160;&#160;&#160;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;178&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right"&gt;&#160;&#160;&#160;&#160;&#160;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;194&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40A_ecustom--PrepaidSoftwareAndLicenses_pn3n3_maOACz300_zwqT8UeANQWd" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Prepaid
    software &amp;amp; licenses&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;84&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;93&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40B_ecustom--PrepaidSalesAndMarketing_pn3n3_maOACz300_z6yjFlOmwoOk" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Prepaid
    sales and marketing&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;65&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;37&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40D_ecustom--PrepaidRecruitingAndHR_iI_pn3n3_maOACz300_zAWlyggL0ss8" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Prepaid
    recruiting&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;57&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;12&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40B_eus-gaap--OtherReceivablesNetCurrent_iI_pn3n3_maOACz300_zWglV7NUVXuc" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Other
    receivables&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;24&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;21&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_407_eus-gaap--DepositsAssetsCurrent_iI_pn3n3_maOACz300_z3KzRt7HPdg4" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Deposits&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1142"&gt;&#x2014;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;68&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40F_eus-gaap--OtherPrepaidExpenseCurrent_iI_pn3n3_maOACz300_zig9OVKS7AMg" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Prepaid
    expenses- other&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;28&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;62&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_409_eus-gaap--OtherAssetsCurrent_iTI_pn3n3_mtOACz300_zE8SwhsDxjF8" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="display: none; font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Other
    current assets&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;436&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;487&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

</us-gaap:ScheduleOfOtherCurrentAssetsTableTextBlock>
    <us-gaap:PrepaidInsurance contextRef="AsOf2022-01-31" decimals="-3" unitRef="USD">178000</us-gaap:PrepaidInsurance>
    <us-gaap:PrepaidInsurance contextRef="AsOf2021-04-30" decimals="-3" unitRef="USD">194000</us-gaap:PrepaidInsurance>
    <OPTT:PrepaidSoftwareAndLicenses contextRef="AsOf2022-01-31" decimals="-3" unitRef="USD">84000</OPTT:PrepaidSoftwareAndLicenses>
    <OPTT:PrepaidSoftwareAndLicenses contextRef="AsOf2021-04-30" decimals="-3" unitRef="USD">93000</OPTT:PrepaidSoftwareAndLicenses>
    <OPTT:PrepaidSalesAndMarketing contextRef="AsOf2022-01-31" decimals="-3" unitRef="USD">65000</OPTT:PrepaidSalesAndMarketing>
    <OPTT:PrepaidSalesAndMarketing contextRef="AsOf2021-04-30" decimals="-3" unitRef="USD">37000</OPTT:PrepaidSalesAndMarketing>
    <OPTT:PrepaidRecruitingAndHR contextRef="AsOf2022-01-31" decimals="-3" unitRef="USD">57000</OPTT:PrepaidRecruitingAndHR>
    <OPTT:PrepaidRecruitingAndHR contextRef="AsOf2021-04-30" decimals="-3" unitRef="USD">12000</OPTT:PrepaidRecruitingAndHR>
    <us-gaap:OtherReceivablesNetCurrent contextRef="AsOf2022-01-31" decimals="-3" unitRef="USD">24000</us-gaap:OtherReceivablesNetCurrent>
    <us-gaap:OtherReceivablesNetCurrent contextRef="AsOf2021-04-30" decimals="-3" unitRef="USD">21000</us-gaap:OtherReceivablesNetCurrent>
    <us-gaap:DepositsAssetsCurrent contextRef="AsOf2021-04-30" decimals="-3" unitRef="USD">68000</us-gaap:DepositsAssetsCurrent>
    <us-gaap:OtherPrepaidExpenseCurrent contextRef="AsOf2022-01-31" decimals="-3" unitRef="USD">28000</us-gaap:OtherPrepaidExpenseCurrent>
    <us-gaap:OtherPrepaidExpenseCurrent contextRef="AsOf2021-04-30" decimals="-3" unitRef="USD">62000</us-gaap:OtherPrepaidExpenseCurrent>
    <us-gaap:OtherAssetsCurrent contextRef="AsOf2022-01-31" decimals="-3" unitRef="USD">436000</us-gaap:OtherAssetsCurrent>
    <us-gaap:OtherAssetsCurrent contextRef="AsOf2021-04-30" decimals="-3" unitRef="USD">487000</us-gaap:OtherAssetsCurrent>
    <us-gaap:PropertyPlantAndEquipmentDisclosureTextBlock contextRef="From2021-05-01to2022-01-31">&lt;p id="xdx_809_eus-gaap--PropertyPlantAndEquipmentDisclosureTextBlock_zoHgeImTxWsg" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;(5)
&lt;span id="xdx_825_zEsi0YOlGtvk"&gt;Property and Equipment, net&lt;/span&gt;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p id="xdx_89B_eus-gaap--PropertyPlantAndEquipmentTextBlock_zkS29BFv5Ahj" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;The
components of property and equipment, net as of January 31, 2022 and April 30, 2021 consisted of the following:&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;span id="xdx_8BA_zQ9sv7Oqikt5" style="display: none"&gt;Schedule of Components of Property and Equipment&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%"&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_498_20220131_zLd1JW1a8JH8" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;January
    31, 2022&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_49B_20210430_zCfif4IC5Vce" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;April
    30, 2021&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="6" style="font: 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;(in
    thousands)&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40D_eus-gaap--PropertyPlantAndEquipmentGross_iI_pn3n3_hus-gaap--PropertyPlantAndEquipmentByTypeAxis__us-gaap--EquipmentMember_zQYinpXEifmh" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 64%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Equipment&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;320&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;291&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_402_eus-gaap--PropertyPlantAndEquipmentGross_iI_pn3n3_hus-gaap--PropertyPlantAndEquipmentByTypeAxis__custom--ComputerEquipmentAndSoftwareMember_zTwHEFIoBx4i" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Computer
    equipment &amp;amp; software&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;521&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;498&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_402_eus-gaap--PropertyPlantAndEquipmentGross_iI_pn3n3_hus-gaap--PropertyPlantAndEquipmentByTypeAxis__custom--OfficeFurnitureAndEquipmentMember_zePmHkVEU5B8" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Office
    furniture &amp;amp; equipment&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;352&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;341&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_400_eus-gaap--PropertyPlantAndEquipmentGross_iI_pn3n3_hus-gaap--PropertyPlantAndEquipmentByTypeAxis__us-gaap--LeaseholdImprovementsMember_zLVXc4GW5DB1" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Leasehold
    improvements&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;474&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;474&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_404_eus-gaap--PropertyPlantAndEquipmentGross_iI_pn3n3_hus-gaap--PropertyPlantAndEquipmentByTypeAxis__us-gaap--ConstructionInProgressMember_zRNP9TiPcXw3" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left; padding-bottom: 1pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Construction
    in process&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;15&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;15&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_407_eus-gaap--PropertyPlantAndEquipmentGross_iI_pn3n3_maPPAENzI8F_znZZYA4b0Jg7" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="display: none; font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Property
    and equipment, gross&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;1,682&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;1,619&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_401_eus-gaap--AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_iNI_pn3n3_di_msPPAENzI8F_zt50YEN1V8Ff" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left; padding-bottom: 1pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Less:
    accumulated depreciation&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;(1,317&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;)&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;(1,213&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;)&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_406_eus-gaap--PropertyPlantAndEquipmentNet_iTI_pn3n3_mtPPAENzI8F_zRRE9SbEVol5" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt"&gt;&lt;span style="display: none; font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Property
    and equipment, net&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;365&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;406&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

&lt;p id="xdx_8A7_zX05log2E8hg" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Depreciation
expense was approximately $&lt;span id="xdx_90D_eus-gaap--Depreciation_pn3n3_c20210501__20220131_zwhH3OsO1ep1" title="Depreciation expense"&gt;104,000&lt;/span&gt; and $&lt;span id="xdx_909_eus-gaap--Depreciation_pn3n3_c20200501__20210131_zTtgmcnN90v1" title="Depreciation expense"&gt;106,000&lt;/span&gt; for the nine month periods ended January 31, 2022 and 2021, respectively.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"/&gt;



&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

</us-gaap:PropertyPlantAndEquipmentDisclosureTextBlock>
    <us-gaap:PropertyPlantAndEquipmentTextBlock contextRef="From2021-05-01to2022-01-31">&lt;p id="xdx_89B_eus-gaap--PropertyPlantAndEquipmentTextBlock_zkS29BFv5Ahj" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;The
components of property and equipment, net as of January 31, 2022 and April 30, 2021 consisted of the following:&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;span id="xdx_8BA_zQ9sv7Oqikt5" style="display: none"&gt;Schedule of Components of Property and Equipment&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%"&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_498_20220131_zLd1JW1a8JH8" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;January
    31, 2022&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_49B_20210430_zCfif4IC5Vce" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;April
    30, 2021&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="6" style="font: 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;(in
    thousands)&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40D_eus-gaap--PropertyPlantAndEquipmentGross_iI_pn3n3_hus-gaap--PropertyPlantAndEquipmentByTypeAxis__us-gaap--EquipmentMember_zQYinpXEifmh" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 64%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Equipment&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;320&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;291&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_402_eus-gaap--PropertyPlantAndEquipmentGross_iI_pn3n3_hus-gaap--PropertyPlantAndEquipmentByTypeAxis__custom--ComputerEquipmentAndSoftwareMember_zTwHEFIoBx4i" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Computer
    equipment &amp;amp; software&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;521&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;498&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_402_eus-gaap--PropertyPlantAndEquipmentGross_iI_pn3n3_hus-gaap--PropertyPlantAndEquipmentByTypeAxis__custom--OfficeFurnitureAndEquipmentMember_zePmHkVEU5B8" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Office
    furniture &amp;amp; equipment&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;352&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;341&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_400_eus-gaap--PropertyPlantAndEquipmentGross_iI_pn3n3_hus-gaap--PropertyPlantAndEquipmentByTypeAxis__us-gaap--LeaseholdImprovementsMember_zLVXc4GW5DB1" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Leasehold
    improvements&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;474&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;474&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_404_eus-gaap--PropertyPlantAndEquipmentGross_iI_pn3n3_hus-gaap--PropertyPlantAndEquipmentByTypeAxis__us-gaap--ConstructionInProgressMember_zRNP9TiPcXw3" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left; padding-bottom: 1pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Construction
    in process&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;15&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;15&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_407_eus-gaap--PropertyPlantAndEquipmentGross_iI_pn3n3_maPPAENzI8F_znZZYA4b0Jg7" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="display: none; font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Property
    and equipment, gross&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;1,682&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;1,619&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_401_eus-gaap--AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_iNI_pn3n3_di_msPPAENzI8F_zt50YEN1V8Ff" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left; padding-bottom: 1pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Less:
    accumulated depreciation&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;(1,317&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;)&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;(1,213&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;)&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_406_eus-gaap--PropertyPlantAndEquipmentNet_iTI_pn3n3_mtPPAENzI8F_zRRE9SbEVol5" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt"&gt;&lt;span style="display: none; font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Property
    and equipment, net&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;365&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;406&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

</us-gaap:PropertyPlantAndEquipmentTextBlock>
    <us-gaap:PropertyPlantAndEquipmentGross
      contextRef="AsOf2022-01-31_us-gaap_EquipmentMember"
      decimals="-3"
      unitRef="USD">320000</us-gaap:PropertyPlantAndEquipmentGross>
    <us-gaap:PropertyPlantAndEquipmentGross
      contextRef="AsOf2021-04-30_us-gaap_EquipmentMember"
      decimals="-3"
      unitRef="USD">291000</us-gaap:PropertyPlantAndEquipmentGross>
    <us-gaap:PropertyPlantAndEquipmentGross
      contextRef="AsOf2022-01-31_custom_ComputerEquipmentAndSoftwareMember"
      decimals="-3"
      unitRef="USD">521000</us-gaap:PropertyPlantAndEquipmentGross>
    <us-gaap:PropertyPlantAndEquipmentGross
      contextRef="AsOf2021-04-30_custom_ComputerEquipmentAndSoftwareMember"
      decimals="-3"
      unitRef="USD">498000</us-gaap:PropertyPlantAndEquipmentGross>
    <us-gaap:PropertyPlantAndEquipmentGross
      contextRef="AsOf2022-01-31_custom_OfficeFurnitureAndEquipmentMember"
      decimals="-3"
      unitRef="USD">352000</us-gaap:PropertyPlantAndEquipmentGross>
    <us-gaap:PropertyPlantAndEquipmentGross
      contextRef="AsOf2021-04-30_custom_OfficeFurnitureAndEquipmentMember"
      decimals="-3"
      unitRef="USD">341000</us-gaap:PropertyPlantAndEquipmentGross>
    <us-gaap:PropertyPlantAndEquipmentGross
      contextRef="AsOf2022-01-31_us-gaap_LeaseholdImprovementsMember"
      decimals="-3"
      unitRef="USD">474000</us-gaap:PropertyPlantAndEquipmentGross>
    <us-gaap:PropertyPlantAndEquipmentGross
      contextRef="AsOf2021-04-30_us-gaap_LeaseholdImprovementsMember"
      decimals="-3"
      unitRef="USD">474000</us-gaap:PropertyPlantAndEquipmentGross>
    <us-gaap:PropertyPlantAndEquipmentGross
      contextRef="AsOf2022-01-31_us-gaap_ConstructionInProgressMember"
      decimals="-3"
      unitRef="USD">15000</us-gaap:PropertyPlantAndEquipmentGross>
    <us-gaap:PropertyPlantAndEquipmentGross
      contextRef="AsOf2021-04-30_us-gaap_ConstructionInProgressMember"
      decimals="-3"
      unitRef="USD">15000</us-gaap:PropertyPlantAndEquipmentGross>
    <us-gaap:PropertyPlantAndEquipmentGross contextRef="AsOf2022-01-31" decimals="-3" unitRef="USD">1682000</us-gaap:PropertyPlantAndEquipmentGross>
    <us-gaap:PropertyPlantAndEquipmentGross contextRef="AsOf2021-04-30" decimals="-3" unitRef="USD">1619000</us-gaap:PropertyPlantAndEquipmentGross>
    <us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment contextRef="AsOf2022-01-31" decimals="-3" unitRef="USD">1317000</us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment>
    <us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment contextRef="AsOf2021-04-30" decimals="-3" unitRef="USD">1213000</us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment>
    <us-gaap:PropertyPlantAndEquipmentNet contextRef="AsOf2022-01-31" decimals="-3" unitRef="USD">365000</us-gaap:PropertyPlantAndEquipmentNet>
    <us-gaap:PropertyPlantAndEquipmentNet contextRef="AsOf2021-04-30" decimals="-3" unitRef="USD">406000</us-gaap:PropertyPlantAndEquipmentNet>
    <us-gaap:Depreciation
      contextRef="From2021-05-01to2022-01-31"
      decimals="-3"
      unitRef="USD">104000000</us-gaap:Depreciation>
    <us-gaap:Depreciation
      contextRef="From2020-05-012021-01-31"
      decimals="-3"
      unitRef="USD">106000000</us-gaap:Depreciation>
    <us-gaap:LesseeOperatingLeasesTextBlock contextRef="From2021-05-01to2022-01-31">&lt;p id="xdx_807_eus-gaap--LesseeOperatingLeasesTextBlock_zCfunVCrZRD2" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;(6)
&lt;span id="xdx_822_zdMHWb6q1UKg"&gt;Leases&lt;/span&gt;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;&#160;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;i&gt;Lessor
Information&lt;/i&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;As
of January 31, 2022, the Company has one lease which has been classified as an operating lease per accounting guidance contained within
ASC Topic 842,&#x201d; &lt;i&gt;Leases&#x201d;&lt;/i&gt;. The Company&#x2019;s remaining term on this operating lease is less than 7 months. The maturity
of lease payments remaining on this lease is immaterial.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;i&gt;Lessee
Information&lt;/i&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;The
Company has a lease for its facility located in Monroe Township, New Jersey that is used as warehouse/production space and the Company&#x2019;s
principal offices and corporate headquarters. &lt;span id="xdx_90D_eus-gaap--LesseeOperatingLeaseOptionToExtend_c20210501__20220131__srt--StatementGeographicalAxis__custom--MonroeTownshipMember_zoTrr3SiP1Z7" title="Lessee, operating lease, option to extend"&gt;The initial lease term is for &lt;span id="xdx_90E_eus-gaap--LesseeOperatingLeaseTermOfContract_c20220131__srt--StatementGeographicalAxis__custom--MonroeTownshipMember" title="Lessee, operating lease, term of contract"&gt;seven years&lt;/span&gt; which expires in November of 2024 with an option
to extend the lease for another five years.&lt;/span&gt; The lease is classified as an operating lease. The operating lease is included in right-of-use
assets, lease liabilities- current and lease liabilities- long-term on the Company&#x2019;s Consolidated Balance Sheets.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;The
Company also has two leases for properties located in Houston, Texas. The first was acquired as part of the 3Dent acquisition
(see Note 18) that is used as office space. The lease term is for &lt;span id="xdx_90D_eus-gaap--LesseeOperatingLeaseTermOfContract_iI_dtY_c20220131__us-gaap--BusinessAcquisitionAxis__custom--ThreeDentAcquisitionMember_zOEJzlVy1RYh" title="Lessee, operating lease, term of contract"&gt;3
&lt;/span&gt;&lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;years and is set to &lt;span id="xdx_906_eus-gaap--LesseeOperatingLeaseOptionToExtend_c20210501__20220131__us-gaap--BusinessAcquisitionAxis__custom--ThreeDentAcquisitionMember_zqfKMeBDwd8d" title="Lessee, operating lease, option to extend"&gt;expire
in January of 2023&lt;/span&gt;&lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;. The lease is classified as
an operating lease and included in the right-of-use assets, lease liabilities- current and lease liabilities- long-term on the Company&#x2019;s
Consolidated Balance Sheets.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;The
other Houston lease is for additional office space and was renewed for a 12-month term ending on June 30, 2022.
In accordance with ASC 842-20-5-2, since the lease term at the time of renewal was 12 months, the asset was recognized directly
to the profit and loss statement on a straight-line basis and was not recognized as a right-of-use asset.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt; background-color: white"&gt;The
Company also has a lease with the University of California Berkeley in Berkeley, California that was acquired as part of the MAR
acquisition (see Note 18). The lease expires on &lt;span id="xdx_90F_eus-gaap--LeaseExpirationDate1_c20210501__20220131__us-gaap--BusinessAcquisitionAxis__custom--ThreeDentAcquisitionMember_zT6osmei8Lh9" title="Lease expiration date"&gt;June
30, 2022&lt;/span&gt;&lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt; background-color: white"&gt;. &lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;In
accordance with ASC 842-20-5-2, since the remaining lease term at the time of the acquisition of MAR was less
than 12 months, the asset was recognized directly to the profit and loss statement on a straight-line basis and was not recognized
as a right-of-use asset.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt; background-color: white"&gt;Right-of-use
asset and operating lease liabilities are recognized based on the present value of futur&lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;e
minimum lease payments over the lease term at commencement date. When the implicit rate of the lease is not provided or cannot be determined,
the Company uses the incremental borrowing rate based on the information available at the effective date to determine the present value
of future payments. Lease terms may include options to extend or terminate the lease when it is reasonably certain that the Company will
exercise those options. The renewal options have not been included in the lease term as they are not reasonably certain of exercise.
Lease expense for minimum lease payments is recognized on a straight- line basis over the lease term and consists of interest on the
lease liability and the amortization of the right of use asset. Variable lease expenses, if any, are recorded as incurred.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;The
operating lease cash flow payments for the three months ended January 31, 2022 and 2021 were $&lt;span id="xdx_906_eus-gaap--OperatingLeasePayments_c20211101__20220131_pp0p0" title="Operating lease payments"&gt;111,000&lt;/span&gt; and $&lt;span id="xdx_900_eus-gaap--OperatingLeasePayments_c20201101__20210131_pp0p0" title="Operating lease payments"&gt;91,000&lt;/span&gt;, respectively. The
operating lease cash flow payments for the nine months ended January 31, 2022 and 2021 were $&lt;span id="xdx_905_eus-gaap--OperatingLeasePayments_c20210501__20220131_pp0p0" title="Operating lease payments"&gt;315,000&lt;/span&gt; and $&lt;span id="xdx_907_eus-gaap--OperatingLeasePayments_c20200501__20210131_pp0p0" title="Operating lease payments"&gt;259,000&lt;/span&gt;, respectively.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"/&gt;



&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p id="xdx_89F_eus-gaap--LeaseCostTableTextBlock_zZrDl53ft1ud" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;The
components of lease expense in the Consolidated Statements of Operations for the three and nine months ended January 31, 2022 and 2021
were as follows:&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;span id="xdx_8BD_zCe6TVq7bgl2" style="display: none"&gt;Schedule of Operating Lease Costs&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%"&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; display: none; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_49D_20211101__20220131_zLP8wmlxyiqk" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2022&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_491_20201101__20210131_zdKOw7bESiDg" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2021&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_49B_20210501__20220131_zrE44jNGBQPf" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2022&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_495_20200501__20210131_zFY2nMX1hffj" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2021&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="6" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Three
    months ended January 31,&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="6" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Nine
    months ended January 31,&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2022&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2021&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2022&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2021&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="6" style="font: 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;(in
    thousands)&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="6" style="font: 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;(in thousands)&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40B_eus-gaap--OperatingLeaseCost_maLCzBwM_zmSUgfJ9eNI9" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 36%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Operating
    lease cost&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 12%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;92&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 12%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;79&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 12%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;276&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 12%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;238&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40F_eus-gaap--ShortTermLeaseCost_maLCzBwM_zqBdE4uVBEV2" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Short-term
    lease cost&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;12&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;7&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;22&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;12&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_409_eus-gaap--LeaseCost_iT_pn3n3_mtLCzBwM_zQVUYr6oRHti" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Total
    lease cost&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;104&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;86&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;298&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;250&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

&lt;p id="xdx_8A1_zt73tT2yM3Wl" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p id="xdx_896_ecustom--ScheduleOfRightofUseAssetsAndLeaseLiabilitiesTableTextBlock_ztFBYrfPIe9h" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Information
related to the Company&#x2019;s right-of use assets and lease liabilities as of January 31, 2022 was as follows:&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;span id="xdx_8B8_zitTl4PqwDad" style="display: none"&gt;Schedule of Right-of Use Assets and Lease Liabilities&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%"&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_490_20220131_zAG3VTEOvvm3" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;January
    31, 2022&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;(in
                                            thousands) &lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-decoration: underline; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Operating
    lease:&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40C_eus-gaap--OperatingLeaseRightOfUseAsset_iI_pn3n3" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 80%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Operating
    right-of-use asset, net&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; width: 16%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;825&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40F_eus-gaap--OperatingLeaseLiabilityCurrent_iI_pn3n3_maOLLzIil_zpvnlDtVLio1" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; padding-left: 10pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Right-of-use
    liability- current&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;323&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_403_eus-gaap--OperatingLeaseLiabilityNoncurrent_iI_pn3n3_maOLLzIil_zCnU2SCKPiCa" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; padding-left: 10pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Right-of-use
    liability- long term&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;615&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_403_eus-gaap--OperatingLeaseLiability_iTI_pn3n3_mtOLLzIil_zQW5UrsDPMul" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Total
    lease liability&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;938&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Weighted
    average remaining lease term- operating leases&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span id="xdx_904_eus-gaap--OperatingLeaseWeightedAverageRemainingLeaseTerm1_iI_dtY_c20220131_zc9i0zCos5oh" title="Weighted average remaining lease term- operating leases"&gt;2.61&lt;/span&gt;
                                            years&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Weighted
    average discount rate- operating leases&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span id="xdx_90B_eus-gaap--OperatingLeaseWeightedAverageDiscountRatePercent_iI_pid_dp_uPure_c20220131_zzxzmM87Mdeb" title="Weighted average discount rate- operating leases"&gt;8.2&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;%&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

&lt;p id="xdx_8A2_z27mbRdoAv5j" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p id="xdx_89F_eus-gaap--LesseeOperatingLeaseLiabilityMaturityTableTextBlock_zk1Cc1oYnOQ4" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Total
remaining lease payments under the Company&#x2019;s operating leases are as follows:&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;span id="xdx_8B1_zWpYTmNFPUk9" style="display: none"&gt;Schedule of Future Minimum Lease Payments Under Operating Lease&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%"&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_493_20220131_zGKX5lWXUqu" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;January
    31, 2022&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="font: 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;(in
    thousands)&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_408_eus-gaap--LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_iI_pn3n3_maLOLLPzbOq_zplVcKBPaBRe" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 80%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Remainder
    of fiscal year 2022&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 16%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;99&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40A_eus-gaap--LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_iI_pn3n3_maLOLLPzbOq_zKlMGr0PknV4" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2023&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;391&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_401_eus-gaap--LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_iI_pn3n3_maLOLLPzbOq_zTCvMfPcgFi3" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2024&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;362&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_403_eus-gaap--LesseeOperatingLeaseLiabilityPaymentsDueYearThree_iI_pn3n3_maLOLLPzbOq_ztcFDWbeWcF4" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2025&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;184&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_407_eus-gaap--LesseeOperatingLeaseLiabilityPaymentsDue_iTI_pn3n3_mtLOLLPzbOq_zM7Ffr6Jyiwh" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Total
    future minimum lease payments&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;1,036&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_408_eus-gaap--LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_iNI_pn3n3_di_zxIt73wmWnR4" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Less
    imputed interest&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;(98&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;)&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_401_eus-gaap--OperatingLeaseLiability_iI_pn3n3" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Total&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;938&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;


&lt;p id="xdx_8A8_zKxnbUNqe7n5" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"/&gt;



&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

</us-gaap:LesseeOperatingLeasesTextBlock>
    <us-gaap:LesseeOperatingLeaseOptionToExtend contextRef="From2021-05-012022-01-31_custom_MonroeTownshipMember">The initial lease term is for seven years which expires in November of 2024 with an option
to extend the lease for another five years.</us-gaap:LesseeOperatingLeaseOptionToExtend>
    <us-gaap:LesseeOperatingLeaseTermOfContract contextRef="AsOf2022-01-31_custom_MonroeTownshipMember">P7Y</us-gaap:LesseeOperatingLeaseTermOfContract>
    <us-gaap:LesseeOperatingLeaseTermOfContract contextRef="AsOf2022-01-31_custom_ThreeDentAcquisitionMember">P3Y</us-gaap:LesseeOperatingLeaseTermOfContract>
    <us-gaap:LesseeOperatingLeaseOptionToExtend contextRef="From2021-05-012022-01-31_custom_ThreeDentAcquisitionMember">expire
in January of 2023</us-gaap:LesseeOperatingLeaseOptionToExtend>
    <us-gaap:LeaseExpirationDate1 contextRef="From2021-05-012022-01-31_custom_ThreeDentAcquisitionMember">2022-06-30</us-gaap:LeaseExpirationDate1>
    <us-gaap:OperatingLeasePayments
      contextRef="From2021-11-012022-01-31"
      decimals="0"
      unitRef="USD">111000</us-gaap:OperatingLeasePayments>
    <us-gaap:OperatingLeasePayments
      contextRef="From2020-11-012021-01-31"
      decimals="0"
      unitRef="USD">91000</us-gaap:OperatingLeasePayments>
    <us-gaap:OperatingLeasePayments
      contextRef="From2021-05-01to2022-01-31"
      decimals="0"
      unitRef="USD">315000</us-gaap:OperatingLeasePayments>
    <us-gaap:OperatingLeasePayments
      contextRef="From2020-05-012021-01-31"
      decimals="0"
      unitRef="USD">259000</us-gaap:OperatingLeasePayments>
    <us-gaap:LeaseCostTableTextBlock contextRef="From2021-05-01to2022-01-31">&lt;p id="xdx_89F_eus-gaap--LeaseCostTableTextBlock_zZrDl53ft1ud" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;The
components of lease expense in the Consolidated Statements of Operations for the three and nine months ended January 31, 2022 and 2021
were as follows:&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;span id="xdx_8BD_zCe6TVq7bgl2" style="display: none"&gt;Schedule of Operating Lease Costs&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%"&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; display: none; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_49D_20211101__20220131_zLP8wmlxyiqk" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2022&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_491_20201101__20210131_zdKOw7bESiDg" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2021&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_49B_20210501__20220131_zrE44jNGBQPf" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2022&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_495_20200501__20210131_zFY2nMX1hffj" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2021&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="6" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Three
    months ended January 31,&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="6" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Nine
    months ended January 31,&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2022&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2021&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2022&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2021&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="6" style="font: 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;(in
    thousands)&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="6" style="font: 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;(in thousands)&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40B_eus-gaap--OperatingLeaseCost_maLCzBwM_zmSUgfJ9eNI9" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 36%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Operating
    lease cost&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 12%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;92&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 12%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;79&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 12%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;276&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 12%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;238&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40F_eus-gaap--ShortTermLeaseCost_maLCzBwM_zqBdE4uVBEV2" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Short-term
    lease cost&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;12&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;7&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;22&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;12&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_409_eus-gaap--LeaseCost_iT_pn3n3_mtLCzBwM_zQVUYr6oRHti" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Total
    lease cost&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;104&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;86&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;298&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;250&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

</us-gaap:LeaseCostTableTextBlock>
    <us-gaap:OperatingLeaseCost
      contextRef="From2021-11-012022-01-31"
      decimals="-3"
      unitRef="USD">92000</us-gaap:OperatingLeaseCost>
    <us-gaap:OperatingLeaseCost
      contextRef="From2020-11-012021-01-31"
      decimals="-3"
      unitRef="USD">79000</us-gaap:OperatingLeaseCost>
    <us-gaap:OperatingLeaseCost
      contextRef="From2021-05-01to2022-01-31"
      decimals="-3"
      unitRef="USD">276000</us-gaap:OperatingLeaseCost>
    <us-gaap:OperatingLeaseCost
      contextRef="From2020-05-012021-01-31"
      decimals="-3"
      unitRef="USD">238000</us-gaap:OperatingLeaseCost>
    <us-gaap:ShortTermLeaseCost
      contextRef="From2021-11-012022-01-31"
      decimals="-3"
      unitRef="USD">12000</us-gaap:ShortTermLeaseCost>
    <us-gaap:ShortTermLeaseCost
      contextRef="From2020-11-012021-01-31"
      decimals="-3"
      unitRef="USD">7000</us-gaap:ShortTermLeaseCost>
    <us-gaap:ShortTermLeaseCost
      contextRef="From2021-05-01to2022-01-31"
      decimals="-3"
      unitRef="USD">22000</us-gaap:ShortTermLeaseCost>
    <us-gaap:ShortTermLeaseCost
      contextRef="From2020-05-012021-01-31"
      decimals="-3"
      unitRef="USD">12000</us-gaap:ShortTermLeaseCost>
    <us-gaap:LeaseCost
      contextRef="From2021-11-012022-01-31"
      decimals="-3"
      unitRef="USD">104000</us-gaap:LeaseCost>
    <us-gaap:LeaseCost
      contextRef="From2020-11-012021-01-31"
      decimals="-3"
      unitRef="USD">86000</us-gaap:LeaseCost>
    <us-gaap:LeaseCost
      contextRef="From2021-05-01to2022-01-31"
      decimals="-3"
      unitRef="USD">298000</us-gaap:LeaseCost>
    <us-gaap:LeaseCost
      contextRef="From2020-05-012021-01-31"
      decimals="-3"
      unitRef="USD">250000</us-gaap:LeaseCost>
    <OPTT:ScheduleOfRightofUseAssetsAndLeaseLiabilitiesTableTextBlock contextRef="From2021-05-01to2022-01-31">&lt;p id="xdx_896_ecustom--ScheduleOfRightofUseAssetsAndLeaseLiabilitiesTableTextBlock_ztFBYrfPIe9h" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Information
related to the Company&#x2019;s right-of use assets and lease liabilities as of January 31, 2022 was as follows:&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;span id="xdx_8B8_zitTl4PqwDad" style="display: none"&gt;Schedule of Right-of Use Assets and Lease Liabilities&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%"&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_490_20220131_zAG3VTEOvvm3" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;January
    31, 2022&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;(in
                                            thousands) &lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-decoration: underline; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Operating
    lease:&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40C_eus-gaap--OperatingLeaseRightOfUseAsset_iI_pn3n3" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 80%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Operating
    right-of-use asset, net&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; width: 16%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;825&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40F_eus-gaap--OperatingLeaseLiabilityCurrent_iI_pn3n3_maOLLzIil_zpvnlDtVLio1" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; padding-left: 10pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Right-of-use
    liability- current&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;323&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_403_eus-gaap--OperatingLeaseLiabilityNoncurrent_iI_pn3n3_maOLLzIil_zCnU2SCKPiCa" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; padding-left: 10pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Right-of-use
    liability- long term&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;615&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_403_eus-gaap--OperatingLeaseLiability_iTI_pn3n3_mtOLLzIil_zQW5UrsDPMul" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Total
    lease liability&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;938&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Weighted
    average remaining lease term- operating leases&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span id="xdx_904_eus-gaap--OperatingLeaseWeightedAverageRemainingLeaseTerm1_iI_dtY_c20220131_zc9i0zCos5oh" title="Weighted average remaining lease term- operating leases"&gt;2.61&lt;/span&gt;
                                            years&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Weighted
    average discount rate- operating leases&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span id="xdx_90B_eus-gaap--OperatingLeaseWeightedAverageDiscountRatePercent_iI_pid_dp_uPure_c20220131_zzxzmM87Mdeb" title="Weighted average discount rate- operating leases"&gt;8.2&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;%&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

</OPTT:ScheduleOfRightofUseAssetsAndLeaseLiabilitiesTableTextBlock>
    <us-gaap:OperatingLeaseRightOfUseAsset contextRef="AsOf2022-01-31" decimals="-3" unitRef="USD">825000</us-gaap:OperatingLeaseRightOfUseAsset>
    <us-gaap:OperatingLeaseLiabilityCurrent contextRef="AsOf2022-01-31" decimals="-3" unitRef="USD">323000</us-gaap:OperatingLeaseLiabilityCurrent>
    <us-gaap:OperatingLeaseLiabilityNoncurrent contextRef="AsOf2022-01-31" decimals="-3" unitRef="USD">615000</us-gaap:OperatingLeaseLiabilityNoncurrent>
    <us-gaap:OperatingLeaseLiability contextRef="AsOf2022-01-31" decimals="-3" unitRef="USD">938000</us-gaap:OperatingLeaseLiability>
    <us-gaap:OperatingLeaseWeightedAverageRemainingLeaseTerm1 contextRef="AsOf2022-01-31">P2Y7M9D</us-gaap:OperatingLeaseWeightedAverageRemainingLeaseTerm1>
    <us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent contextRef="AsOf2022-01-31" decimals="INF" unitRef="Pure">0.082</us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent>
    <us-gaap:LesseeOperatingLeaseLiabilityMaturityTableTextBlock contextRef="From2021-05-01to2022-01-31">&lt;p id="xdx_89F_eus-gaap--LesseeOperatingLeaseLiabilityMaturityTableTextBlock_zk1Cc1oYnOQ4" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Total
remaining lease payments under the Company&#x2019;s operating leases are as follows:&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;span id="xdx_8B1_zWpYTmNFPUk9" style="display: none"&gt;Schedule of Future Minimum Lease Payments Under Operating Lease&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%"&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_493_20220131_zGKX5lWXUqu" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;January
    31, 2022&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="font: 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;(in
    thousands)&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_408_eus-gaap--LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_iI_pn3n3_maLOLLPzbOq_zplVcKBPaBRe" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 80%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Remainder
    of fiscal year 2022&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 16%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;99&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40A_eus-gaap--LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_iI_pn3n3_maLOLLPzbOq_zKlMGr0PknV4" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2023&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;391&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_401_eus-gaap--LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_iI_pn3n3_maLOLLPzbOq_zTCvMfPcgFi3" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2024&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;362&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_403_eus-gaap--LesseeOperatingLeaseLiabilityPaymentsDueYearThree_iI_pn3n3_maLOLLPzbOq_ztcFDWbeWcF4" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2025&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;184&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_407_eus-gaap--LesseeOperatingLeaseLiabilityPaymentsDue_iTI_pn3n3_mtLOLLPzbOq_zM7Ffr6Jyiwh" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Total
    future minimum lease payments&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;1,036&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_408_eus-gaap--LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_iNI_pn3n3_di_zxIt73wmWnR4" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Less
    imputed interest&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;(98&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;)&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_401_eus-gaap--OperatingLeaseLiability_iI_pn3n3" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Total&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;938&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;


</us-gaap:LesseeOperatingLeaseLiabilityMaturityTableTextBlock>
    <us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear contextRef="AsOf2022-01-31" decimals="-3" unitRef="USD">99000</us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear>
    <us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths contextRef="AsOf2022-01-31" decimals="-3" unitRef="USD">391000</us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths>
    <us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo contextRef="AsOf2022-01-31" decimals="-3" unitRef="USD">362000</us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo>
    <us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree contextRef="AsOf2022-01-31" decimals="-3" unitRef="USD">184000</us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree>
    <us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue contextRef="AsOf2022-01-31" decimals="-3" unitRef="USD">1036000</us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue>
    <us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount contextRef="AsOf2022-01-31" decimals="-3" unitRef="USD">98000</us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount>
    <us-gaap:OperatingLeaseLiability contextRef="AsOf2022-01-31" decimals="-3" unitRef="USD">938000</us-gaap:OperatingLeaseLiability>
    <us-gaap:AccountsPayableAndAccruedLiabilitiesDisclosureTextBlock contextRef="From2021-05-01to2022-01-31">&lt;p id="xdx_808_eus-gaap--AccountsPayableAndAccruedLiabilitiesDisclosureTextBlock_zTj6eYHyQ82e" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;(7)
&lt;span id="xdx_82A_zjg4175tMeLk"&gt;Accrued Expenses&lt;/span&gt;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;&#160;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p id="xdx_895_eus-gaap--ScheduleOfAccruedLiabilitiesTableTextBlock_z1TUMTLUEYTk" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Accrued
expenses consisted of the following at January 31, 2022 and April 30, 2021:&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;span id="xdx_8B1_zwqSHtG4zde8" style="display: none"&gt;Schedule of Accrued Expenses&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%"&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_495_20220131_z1r0lzKjL3N4" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;January
    31, 2022&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_494_20210430_zb36zBnpm6E3" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;April
    30, 2021&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="font: 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;(in
    thousands)&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="font: 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;(in
    thousands)&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_406_eus-gaap--ConstructionPayableCurrent_iI_pn3n3_maALCzOT0_zoHZ8Ip2GS5k" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 64%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Project
    costs&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;102&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;368&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_408_eus-gaap--LossContingencyAccrualCarryingValueCurrent_iI_pn3n3_maALCzOT0_zzDIe372nbn1" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Contract
    loss reserve&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;328&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;328&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_405_eus-gaap--OtherEmployeeRelatedLiabilitiesCurrent_iI_pn3n3_maALCzOT0_z3xOcTIGukI" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Employee
    incentive payments&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;191&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;283&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40C_eus-gaap--AccruedSalariesCurrent_iI_pn3n3_maALCzOT0_zWKdZb64ggJ2" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Accrued
    salary and benefits&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;409&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;631&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_406_eus-gaap--AccruedProfessionalFeesCurrent_iI_pn3n3_maALCzOT0_z4lBY0qoR35k" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Professional
    fees&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;96&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;200&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_400_eus-gaap--OtherAccruedLiabilitiesCurrent_iI_pn3n3_maALCzOT0_z1joKwXNreFj" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Other&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;166&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;71&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40E_eus-gaap--AccruedLiabilitiesCurrent_iTI_pn3n3_mtALCzOT0_z2ki5V06ZCg3" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="display: none; font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Accrued
    expenses total&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;1,292&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;1,881&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

&lt;p id="xdx_8AB_zoh2YUoFwzf5" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"/&gt;



&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

</us-gaap:AccountsPayableAndAccruedLiabilitiesDisclosureTextBlock>
    <us-gaap:ScheduleOfAccruedLiabilitiesTableTextBlock contextRef="From2021-05-01to2022-01-31">&lt;p id="xdx_895_eus-gaap--ScheduleOfAccruedLiabilitiesTableTextBlock_z1TUMTLUEYTk" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Accrued
expenses consisted of the following at January 31, 2022 and April 30, 2021:&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;span id="xdx_8B1_zwqSHtG4zde8" style="display: none"&gt;Schedule of Accrued Expenses&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%"&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_495_20220131_z1r0lzKjL3N4" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;January
    31, 2022&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_494_20210430_zb36zBnpm6E3" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;April
    30, 2021&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="font: 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;(in
    thousands)&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="font: 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;(in
    thousands)&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_406_eus-gaap--ConstructionPayableCurrent_iI_pn3n3_maALCzOT0_zoHZ8Ip2GS5k" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 64%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Project
    costs&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;102&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;368&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_408_eus-gaap--LossContingencyAccrualCarryingValueCurrent_iI_pn3n3_maALCzOT0_zzDIe372nbn1" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Contract
    loss reserve&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;328&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;328&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_405_eus-gaap--OtherEmployeeRelatedLiabilitiesCurrent_iI_pn3n3_maALCzOT0_z3xOcTIGukI" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Employee
    incentive payments&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;191&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;283&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40C_eus-gaap--AccruedSalariesCurrent_iI_pn3n3_maALCzOT0_zWKdZb64ggJ2" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Accrued
    salary and benefits&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;409&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;631&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_406_eus-gaap--AccruedProfessionalFeesCurrent_iI_pn3n3_maALCzOT0_z4lBY0qoR35k" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Professional
    fees&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;96&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;200&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_400_eus-gaap--OtherAccruedLiabilitiesCurrent_iI_pn3n3_maALCzOT0_z1joKwXNreFj" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Other&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;166&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;71&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40E_eus-gaap--AccruedLiabilitiesCurrent_iTI_pn3n3_mtALCzOT0_z2ki5V06ZCg3" style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="display: none; font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Accrued
    expenses total&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;1,292&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;1,881&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

</us-gaap:ScheduleOfAccruedLiabilitiesTableTextBlock>
    <us-gaap:ConstructionPayableCurrent contextRef="AsOf2022-01-31" decimals="-3" unitRef="USD">102000</us-gaap:ConstructionPayableCurrent>
    <us-gaap:ConstructionPayableCurrent contextRef="AsOf2021-04-30" decimals="-3" unitRef="USD">368000</us-gaap:ConstructionPayableCurrent>
    <us-gaap:LossContingencyAccrualCarryingValueCurrent contextRef="AsOf2022-01-31" decimals="-3" unitRef="USD">328000</us-gaap:LossContingencyAccrualCarryingValueCurrent>
    <us-gaap:LossContingencyAccrualCarryingValueCurrent contextRef="AsOf2021-04-30" decimals="-3" unitRef="USD">328000</us-gaap:LossContingencyAccrualCarryingValueCurrent>
    <us-gaap:OtherEmployeeRelatedLiabilitiesCurrent contextRef="AsOf2022-01-31" decimals="-3" unitRef="USD">191000</us-gaap:OtherEmployeeRelatedLiabilitiesCurrent>
    <us-gaap:OtherEmployeeRelatedLiabilitiesCurrent contextRef="AsOf2021-04-30" decimals="-3" unitRef="USD">283000</us-gaap:OtherEmployeeRelatedLiabilitiesCurrent>
    <us-gaap:AccruedSalariesCurrent contextRef="AsOf2022-01-31" decimals="-3" unitRef="USD">409000</us-gaap:AccruedSalariesCurrent>
    <us-gaap:AccruedSalariesCurrent contextRef="AsOf2021-04-30" decimals="-3" unitRef="USD">631000</us-gaap:AccruedSalariesCurrent>
    <us-gaap:AccruedProfessionalFeesCurrent contextRef="AsOf2022-01-31" decimals="-3" unitRef="USD">96000</us-gaap:AccruedProfessionalFeesCurrent>
    <us-gaap:AccruedProfessionalFeesCurrent contextRef="AsOf2021-04-30" decimals="-3" unitRef="USD">200000</us-gaap:AccruedProfessionalFeesCurrent>
    <us-gaap:OtherAccruedLiabilitiesCurrent contextRef="AsOf2022-01-31" decimals="-3" unitRef="USD">166000</us-gaap:OtherAccruedLiabilitiesCurrent>
    <us-gaap:OtherAccruedLiabilitiesCurrent contextRef="AsOf2021-04-30" decimals="-3" unitRef="USD">71000</us-gaap:OtherAccruedLiabilitiesCurrent>
    <us-gaap:AccruedLiabilitiesCurrent contextRef="AsOf2022-01-31" decimals="-3" unitRef="USD">1292000</us-gaap:AccruedLiabilitiesCurrent>
    <us-gaap:AccruedLiabilitiesCurrent contextRef="AsOf2021-04-30" decimals="-3" unitRef="USD">1881000</us-gaap:AccruedLiabilitiesCurrent>
    <OPTT:WarrantDisclosureTextBlock contextRef="From2021-05-01to2022-01-31">&lt;p id="xdx_805_ecustom--WarrantDisclosureTextBlock_zAqjhc3JX067" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;(8)
&lt;span id="xdx_822_zp3b90MKJKUd"&gt;Warrants&lt;/span&gt;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;i&gt;Liability
Classified Warrants&lt;/i&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;On
June 2, 2016, the Company entered into a securities purchase agreement, which was amended on June 7, 2016 (as amended, the &#x201c;June
Purchase Agreement&#x201d;) with certain institutional purchasers (the &#x201c;June Purchasers&#x201d;). Pursuant to the terms of the June
Purchase Agreement, the Company sold an aggregate of &lt;span id="xdx_902_eus-gaap--SaleOfStockNumberOfSharesIssuedInTransaction_pid_c20160601__20160602__us-gaap--TypeOfArrangementAxis__custom--JunePurchaseAgreementMember_zdhIBEnDbcRe" title="Number of common stock shares sold"&gt;20,850&lt;/span&gt; shares of Common Stock together with warrants to purchase up to an aggregate
of &lt;span id="xdx_90D_eus-gaap--ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights_iI_pid_c20160602__us-gaap--TypeOfArrangementAxis__custom--JunePurchaseAgreementMember_zXg1olcZgxY7" title="Purchase of warrants"&gt;7,298&lt;/span&gt; shares of Common Stock. Each share of common stock was sold together with a warrant to purchase &lt;span id="xdx_902_eus-gaap--ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight_iI_pid_c20160602__us-gaap--TypeOfArrangementAxis__custom--JunePurchaseAgreementMember_zmwqblH8CCLf" title="Purchase of common stock warrants"&gt;0.35&lt;/span&gt; of a share of common stock
at a combined purchase price of $&lt;span id="xdx_90F_ecustom--CommonStockCombinedPurchasePricePerShare_iI_pid_c20160602__us-gaap--TypeOfArrangementAxis__custom--JunePurchaseAgreementMember_zjRgijf2CZK4" title="Common stock combined purchase price per share"&gt;92.00&lt;/span&gt;. The warrants have an exercise price of $&lt;span id="xdx_906_eus-gaap--ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_iI_pid_c20160602__us-gaap--TypeOfArrangementAxis__custom--JunePurchaseAgreementMember_zy1QeqkOWR52" title="Exercise price of warrants"&gt;121.60&lt;/span&gt; per share, became exercisable on December 3, 2016
(&#x201c;Initial Exercise Date&#x201d;), and expired on December 3, 2021, &lt;span id="xdx_908_eus-gaap--WarrantsAndRightsOutstandingTerm_iI_dc_c20160602__us-gaap--TypeOfArrangementAxis__custom--JunePurchaseAgreementMember_zfh3ZLSZbe9l" title="Warrants and rights outstanding, term"&gt;five years&lt;/span&gt; following the Initial Exercise Date. As of the expiration
date, &lt;span id="xdx_900_ecustom--NumberOfExercisedWarrants_iI_pid_dn_c20160602__us-gaap--TypeOfArrangementAxis__custom--JunePurchaseAgreementMember_zAewyaW9hg9k" title="Number of exercised warrants"&gt;none&lt;/span&gt; of the warrants had been exercised.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;On
July 22, 2016, the Company entered into a Second Amendment to the Purchase Agreement (the &#x201c;Second Amended Purchase Agreement&#x201d;)
with certain institutional purchasers (the &#x201c;July Purchasers&#x201d;). Pursuant to the terms of the Second Amended Purchase Agreement,
the Company sold an aggregate of &lt;span id="xdx_90E_eus-gaap--SaleOfStockNumberOfSharesIssuedInTransaction_pid_c20160721__20160722__us-gaap--TypeOfArrangementAxis__custom--SecondAmendedPurchaseAgreementMember_zGHYMDcO7SY"&gt;29,750
&lt;/span&gt;&lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;shares of Common Stock together with warrants
to purchase up to an aggregate of &lt;span id="xdx_905_eus-gaap--ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights_iI_pid_c20160722__us-gaap--TypeOfArrangementAxis__custom--SecondAmendedPurchaseAgreementMember_zVPFyz5bHLW"&gt;8,925
&lt;/span&gt;&lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;shares of Common Stock. Each share of common
stock was sold together with a warrant to purchase &lt;span id="xdx_908_eus-gaap--ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight_iI_pid_c20160722__us-gaap--TypeOfArrangementAxis__custom--SecondAmendedPurchaseAgreementMember_zcI6OyKq7aci"&gt;0.30
&lt;/span&gt;&lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;of a share of common stock at a combined purchase
price of $&lt;span id="xdx_904_ecustom--CommonStockCombinedPurchasePricePerShare_iI_pid_c20160722__us-gaap--TypeOfArrangementAxis__custom--SecondAmendedPurchaseAgreementMember_zxCP97f4Mi6i"&gt;135.00&lt;/span&gt;&lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;.
The warrants were exercisable immediately at an exercise price of $&lt;span id="xdx_905_eus-gaap--ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_iI_pid_c20160722__us-gaap--TypeOfArrangementAxis__custom--SecondAmendedPurchaseAgreementMember_z5YlmAP0zq5h"&gt;187.20
&lt;/span&gt;&lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;per share. The warrants expired on &lt;span id="xdx_90B_eus-gaap--WarrantsAndRightsOutstandingMaturityDate_iI_dd_c20160722__us-gaap--TypeOfArrangementAxis__custom--SecondAmendedPurchaseAgreementMember_z4Vz2et7jnQ"&gt;January
23, 2022&lt;/span&gt;&lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;, the fifth (&lt;span id="xdx_90A_eus-gaap--WarrantsAndRightsOutstandingTerm_iI_dtY_c20160722__us-gaap--TypeOfArrangementAxis__custom--SecondAmendedPurchaseAgreementMember_zyhdpDZV8GNh"&gt;5&lt;/span&gt;&lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;th)
anniversary of the initial exercise date of January 23, 2017. As of the expiration date, &lt;span id="xdx_902_ecustom--NumberOfExercisedWarrants_iI_pid_dn_c20160722__us-gaap--TypeOfArrangementAxis__custom--SecondAmendedPurchaseAgreementMember_zOJTElIUBnZj"&gt;none
&lt;/span&gt;&lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;of the warrants had been exercised.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;i&gt;Equity
Classified Warrants&lt;/i&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;On
April 8, 2019, the Company issued and sold &lt;span id="xdx_903_eus-gaap--SaleOfStockNumberOfSharesIssuedInTransaction_pid_c20190407__20190408_zh7i4PrcXq6b" title="Number of common stock shares sold"&gt;1,542,000&lt;/span&gt; shares of common stock and pre-funded warrants to purchase up to &lt;span id="xdx_90F_eus-gaap--ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights_iI_pid_c20190408__us-gaap--StatementEquityComponentsAxis__custom--PreFundedWarrantsMember_znGb5S4Taub8" title="Purchase of warrants"&gt;3,385,680&lt;/span&gt; shares
of common stock and common warrants to purchase up to &lt;span id="xdx_901_eus-gaap--ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights_iI_pid_c20190408__us-gaap--StatementEquityComponentsAxis__custom--CommonWarrantsMember_zjLUTX0mFJ89" title="Purchase of warrants"&gt;4,927,680&lt;/span&gt; shares of our common stock in an underwritten public offering. The public
offering price for the pre-funded warrants was equal to the public offering price of the common stock, less the $&lt;span id="xdx_908_eus-gaap--ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_iI_pid_c20190408__us-gaap--StatementEquityComponentsAxis__custom--PreFundedWarrantsMember_zf5NZT0Xb6uh" title="Exercise price of warrants"&gt;0.01&lt;/span&gt; per share exercise
price of each warrant. The pre-funded warrants have no expiration date. As of January 31, 2022, all of the pre-funded warrants had been
exercised. The common stock warrants have an exercise price of $&lt;span id="xdx_905_eus-gaap--ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_iI_pid_c20190408__us-gaap--StatementEquityComponentsAxis__custom--CommonWarrantsMember_zY3lQEdmPMd" title="Exercise price of warrants"&gt;3.85&lt;/span&gt; per share and expire &lt;span id="xdx_903_eus-gaap--WarrantsAndRightsOutstandingTerm_iI_dc_c20190408__us-gaap--StatementEquityComponentsAxis__custom--CommonWarrantsMember_zVPqRLMLYEfk" title="Warrants and rights outstanding, term"&gt;five years&lt;/span&gt; from the issuance date. As of January
31, 2022, all of the common warrants had been exercised.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;The
Company accounts for warrants issued in connection with its June 2016 and July 2016 public offerings in accordance with the guidance
on &#x201c;&lt;i&gt;Accounting for Certain Financial Instruments with Characteristics of Both Liabilities and Equity&lt;/i&gt;&#x201d; in Topic 480
which provides that the Company classify the warrant instruments as a liability at its fair value. The warrant liabilities are subject
to re-measurement at each balance sheet date using the Black-Scholes option pricing model. The June 2016 and July 2016 warrants contained
a feature whereby they could require the transfer of assets and therefore are classified as a liability award in accordance with the
guidance in Topic 480. The warrants were all expired as of January 31, 2022 and had a value near zero as of &lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;April 30, 2021. The pre-funded and
common warrants issued in the Company&#x2019;s April 8, 2019 public offering did not meet the criteria to be classified as a liability
award and therefore were treated as an equity award and recorded as a component of shareholders&#x2019; equity in the Consolidated Balance
Sheets.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"/&gt;



&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

</OPTT:WarrantDisclosureTextBlock>
    <us-gaap:SaleOfStockNumberOfSharesIssuedInTransaction
      contextRef="From2016-06-012016-06-02_custom_JunePurchaseAgreementMember"
      decimals="INF"
      unitRef="Shares">20850</us-gaap:SaleOfStockNumberOfSharesIssuedInTransaction>
    <us-gaap:ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
      contextRef="AsOf2016-06-02_custom_JunePurchaseAgreementMember"
      decimals="INF"
      unitRef="Shares">7298</us-gaap:ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights>
    <us-gaap:ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight
      contextRef="AsOf2016-06-02_custom_JunePurchaseAgreementMember"
      decimals="INF"
      unitRef="Shares">0.35</us-gaap:ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight>
    <OPTT:CommonStockCombinedPurchasePricePerShare
      contextRef="AsOf2016-06-02_custom_JunePurchaseAgreementMember"
      decimals="INF"
      unitRef="USDPShares">92.00</OPTT:CommonStockCombinedPurchasePricePerShare>
    <us-gaap:ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
      contextRef="AsOf2016-06-02_custom_JunePurchaseAgreementMember"
      decimals="INF"
      unitRef="USDPShares">121.60</us-gaap:ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1>
    <us-gaap:WarrantsAndRightsOutstandingTerm contextRef="AsOf2016-06-02_custom_JunePurchaseAgreementMember">P5Y</us-gaap:WarrantsAndRightsOutstandingTerm>
    <OPTT:NumberOfExercisedWarrants
      contextRef="AsOf2016-06-02_custom_JunePurchaseAgreementMember"
      decimals="INF"
      unitRef="Shares">0</OPTT:NumberOfExercisedWarrants>
    <us-gaap:SaleOfStockNumberOfSharesIssuedInTransaction
      contextRef="From2016-07-212016-07-22_custom_SecondAmendedPurchaseAgreementMember"
      decimals="INF"
      unitRef="Shares">29750</us-gaap:SaleOfStockNumberOfSharesIssuedInTransaction>
    <us-gaap:ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
      contextRef="AsOf2016-07-22_custom_SecondAmendedPurchaseAgreementMember"
      decimals="INF"
      unitRef="Shares">8925</us-gaap:ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights>
    <us-gaap:ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight
      contextRef="AsOf2016-07-22_custom_SecondAmendedPurchaseAgreementMember"
      decimals="INF"
      unitRef="Shares">0.30</us-gaap:ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight>
    <OPTT:CommonStockCombinedPurchasePricePerShare
      contextRef="AsOf2016-07-22_custom_SecondAmendedPurchaseAgreementMember"
      decimals="INF"
      unitRef="USDPShares">135.00</OPTT:CommonStockCombinedPurchasePricePerShare>
    <us-gaap:ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
      contextRef="AsOf2016-07-22_custom_SecondAmendedPurchaseAgreementMember"
      decimals="INF"
      unitRef="USDPShares">187.20</us-gaap:ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1>
    <us-gaap:WarrantsAndRightsOutstandingMaturityDate contextRef="AsOf2016-07-22_custom_SecondAmendedPurchaseAgreementMember">2022-01-23</us-gaap:WarrantsAndRightsOutstandingMaturityDate>
    <us-gaap:WarrantsAndRightsOutstandingTerm contextRef="AsOf2016-07-22_custom_SecondAmendedPurchaseAgreementMember">P5Y</us-gaap:WarrantsAndRightsOutstandingTerm>
    <OPTT:NumberOfExercisedWarrants
      contextRef="AsOf2016-07-22_custom_SecondAmendedPurchaseAgreementMember"
      decimals="INF"
      unitRef="Shares">0</OPTT:NumberOfExercisedWarrants>
    <us-gaap:SaleOfStockNumberOfSharesIssuedInTransaction
      contextRef="From2019-04-072019-04-08"
      decimals="INF"
      unitRef="Shares">1542000</us-gaap:SaleOfStockNumberOfSharesIssuedInTransaction>
    <us-gaap:ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
      contextRef="AsOf2019-04-08_custom_PreFundedWarrantsMember"
      decimals="INF"
      unitRef="Shares">3385680</us-gaap:ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights>
    <us-gaap:ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
      contextRef="AsOf2019-04-08_custom_CommonWarrantsMember"
      decimals="INF"
      unitRef="Shares">4927680</us-gaap:ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights>
    <us-gaap:ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
      contextRef="AsOf2019-04-08_custom_PreFundedWarrantsMember"
      decimals="INF"
      unitRef="USDPShares">0.01</us-gaap:ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1>
    <us-gaap:ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
      contextRef="AsOf2019-04-08_custom_CommonWarrantsMember"
      decimals="INF"
      unitRef="USDPShares">3.85</us-gaap:ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1>
    <us-gaap:WarrantsAndRightsOutstandingTerm contextRef="AsOf2019-04-08_custom_CommonWarrantsMember">P5Y</us-gaap:WarrantsAndRightsOutstandingTerm>
    <us-gaap:DebtDisclosureTextBlock contextRef="From2021-05-01to2022-01-31">&lt;p id="xdx_801_eus-gaap--DebtDisclosureTextBlock_zogtgjNXwXBa" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;(9)
&lt;span id="xdx_82E_zZh36Vz1giuh"&gt;Paycheck Protection Program Loan&lt;/span&gt;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;&#160;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;On
March 27, 2020, the U.S. Government passed into law the Coronavirus Aid, Relief and Economic Security Act, or the (&#x201c;CARES Act&#x201d;).
On May 3, 2020, the Company signed a Paycheck Protection Program (&#x201c;PPP&#x201d;) loan with Santander as the lender for approximately
$&lt;span id="xdx_907_eus-gaap--ProceedsFromLoanOriginations1_c20200501__20200503__us-gaap--TypeOfArrangementAxis__custom--PaycheckProtectionProgramMember_pp0p0" title="Proceeds from loan originations"&gt;890,000&lt;/span&gt; in support through the Small Business Association (&#x201c;SBA&#x201d;) under the PPP Loan. The PPP Loan was unsecured and evidenced
by a note in favor of Santander as the lender and governed by a Loan Agreement with Santander. The Company received the proceeds on May
5, 2020.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span id="xdx_906_ecustom--DebtForgivenessDescription_c20200501__20200503__us-gaap--TypeOfArrangementAxis__custom--PaycheckProtectionProgramMember_zBmMYTCywIXf" title="Debt forgiveness, description"&gt;The
Company filed its loan forgiveness application at the end of February 2021 asking for &lt;span id="xdx_90C_eus-gaap--DebtInstrumentInterestRateStatedPercentage_iI_pid_dp_c20200503__us-gaap--TypeOfArrangementAxis__custom--PaycheckProtectionProgramMember_zPsNYjhcoO9j" title="Debt interest rate"&gt;100&lt;/span&gt;% forgiveness of the loan. In June 2021, the
Company was informed that its application was approved, and that the loan is now fully forgiven. The Company recognized a gain on extinguishment
of PPP loan of approximately $&lt;span id="xdx_905_eus-gaap--RepaymentsOfLongTermDebt_pp0p0_c20210202__20211031__us-gaap--TypeOfArrangementAxis__custom--PaycheckProtectionProgramMember_ztMXdZv6vRHj" title="Repayments of long-term debt"&gt;890,000&lt;/span&gt; during the nine months ended October 31, 2021 as reflected on the Consolidated Statement of Operations.&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

</us-gaap:DebtDisclosureTextBlock>
    <us-gaap:ProceedsFromLoanOriginations1
      contextRef="From2020-05-012020-05-03_custom_PaycheckProtectionProgramMember"
      decimals="0"
      unitRef="USD">890000</us-gaap:ProceedsFromLoanOriginations1>
    <OPTT:DebtForgivenessDescription contextRef="From2020-05-012020-05-03_custom_PaycheckProtectionProgramMember">The
Company filed its loan forgiveness application at the end of February 2021 asking for 100% forgiveness of the loan. In June 2021, the
Company was informed that its application was approved, and that the loan is now fully forgiven. The Company recognized a gain on extinguishment
of PPP loan of approximately $890,000 during the nine months ended October 31, 2021 as reflected on the Consolidated Statement of Operations.</OPTT:DebtForgivenessDescription>
    <us-gaap:DebtInstrumentInterestRateStatedPercentage
      contextRef="AsOf2020-05-03_custom_PaycheckProtectionProgramMember"
      decimals="INF"
      unitRef="Pure">1</us-gaap:DebtInstrumentInterestRateStatedPercentage>
    <us-gaap:RepaymentsOfLongTermDebt
      contextRef="From2021-02-022021-10-31_custom_PaycheckProtectionProgramMember"
      decimals="0"
      unitRef="USD">890000</us-gaap:RepaymentsOfLongTermDebt>
    <us-gaap:PreferredStockTextBlock contextRef="From2021-05-01to2022-01-31">&lt;p id="xdx_80E_eus-gaap--PreferredStockTextBlock_zQ2qEZB56wd4" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;(10)
&lt;span id="xdx_822_z6ctCEBR8aT5"&gt;Preferred Stock&lt;/span&gt;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;&#160;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;The
Company has authorized &lt;span id="xdx_90A_eus-gaap--PreferredStockSharesAuthorized_iI_pid_c20220131_z22aIg5O2fS2" title="Preferred stock, shares authorized"&gt;5,000,000&lt;/span&gt; shares of undesignated preferred stock with a par value of $&lt;span id="xdx_90A_eus-gaap--PreferredStockParOrStatedValuePerShare_iI_pid_c20220131_z6wkombe8Nw2" title="Preferred stock, par value"&gt;0.001&lt;/span&gt; per share. As of January 31, 2022,
&lt;span id="xdx_90F_eus-gaap--PreferredStockSharesIssued_iI_pid_do_c20220131_zZ2QEyzrQjQd" title="Preferred stock, shares issued"&gt;no&lt;/span&gt; shares of preferred stock had been issued.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

</us-gaap:PreferredStockTextBlock>
    <us-gaap:PreferredStockSharesAuthorized contextRef="AsOf2022-01-31" decimals="INF" unitRef="Shares">5000000</us-gaap:PreferredStockSharesAuthorized>
    <us-gaap:PreferredStockParOrStatedValuePerShare
      contextRef="AsOf2022-01-31"
      decimals="INF"
      unitRef="USDPShares">0.001</us-gaap:PreferredStockParOrStatedValuePerShare>
    <us-gaap:PreferredStockSharesIssued contextRef="AsOf2022-01-31" decimals="INF" unitRef="Shares">0</us-gaap:PreferredStockSharesIssued>
    <us-gaap:StockholdersEquityNoteDisclosureTextBlock contextRef="From2021-05-01to2022-01-31">&lt;p id="xdx_80F_eus-gaap--StockholdersEquityNoteDisclosureTextBlock_zVNhMxmWvUue" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;(11)
&lt;span id="xdx_82C_zAV1WBwr0pLa"&gt;Common Stock&lt;/span&gt;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;&#160;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;The
Company has authorized &lt;span id="xdx_90A_eus-gaap--CommonStockSharesAuthorized_iI_pid_c20220131_zXnWJxsQtzq9" title="Common stock, shares authorized"&gt;100,000,000&lt;/span&gt; shares of common stock with a par value of $&lt;span id="xdx_90B_eus-gaap--CommonStockParOrStatedValuePerShare_iI_pid_c20220131_zYD7eYP5B9T9" title="Common stock, par value"&gt;0.001&lt;/span&gt; per share. As of January 31, 2022, &lt;span id="xdx_905_eus-gaap--CommonStockSharesIssued_iI_pid_c20220131_z2YNQhCCcp1" title="Common stock, shares issued"&gt;&lt;span id="xdx_902_eus-gaap--CommonStockSharesOutstanding_iI_pid_c20220131_z1LAV7F7DLFi" title="Common stock, shares outstanding"&gt;55,894,213&lt;/span&gt;&lt;/span&gt; shares
had been issued and are outstanding.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

</us-gaap:StockholdersEquityNoteDisclosureTextBlock>
    <us-gaap:CommonStockSharesAuthorized contextRef="AsOf2022-01-31" decimals="INF" unitRef="Shares">100000000</us-gaap:CommonStockSharesAuthorized>
    <us-gaap:CommonStockParOrStatedValuePerShare
      contextRef="AsOf2022-01-31"
      decimals="INF"
      unitRef="USDPShares">0.001</us-gaap:CommonStockParOrStatedValuePerShare>
    <us-gaap:CommonStockSharesIssued contextRef="AsOf2022-01-31" decimals="INF" unitRef="Shares">55894213</us-gaap:CommonStockSharesIssued>
    <us-gaap:CommonStockSharesOutstanding contextRef="AsOf2022-01-31" decimals="INF" unitRef="Shares">55894213</us-gaap:CommonStockSharesOutstanding>
    <us-gaap:TreasuryStockTextBlock contextRef="From2021-05-01to2022-01-31">&lt;p id="xdx_800_eus-gaap--TreasuryStockTextBlock_zy4ucjx0hgBh" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;(12)
&lt;span id="xdx_82B_zQQs684KTUc4"&gt;Treasury Shares&lt;/span&gt;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;During
each of the nine months ended January 31, 2022 and 2021, &lt;span id="xdx_90F_eus-gaap--TreasuryStockSharesAcquired_pid_do_c20210501__20220131_zNwLX97hwmc4" title="Treasury stock, shares, acquired"&gt;&lt;span id="xdx_906_eus-gaap--TreasuryStockSharesAcquired_pid_do_c20200501__20210131_zOu2wKXnw452" title="Treasury stock, shares, acquired"&gt;no&lt;/span&gt;&lt;/span&gt; shares of common stock were purchased by the Company from employees to pay
taxes related to the vesting of restricted stock.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

</us-gaap:TreasuryStockTextBlock>
    <us-gaap:TreasuryStockSharesAcquired
      contextRef="From2021-05-01to2022-01-31"
      decimals="INF"
      unitRef="Shares">0</us-gaap:TreasuryStockSharesAcquired>
    <us-gaap:TreasuryStockSharesAcquired
      contextRef="From2020-05-012021-01-31"
      decimals="INF"
      unitRef="Shares">0</us-gaap:TreasuryStockSharesAcquired>
    <us-gaap:DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock contextRef="From2021-05-01to2022-01-31">&lt;p id="xdx_805_eus-gaap--DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_zXRqsvPgPG7k" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;(13)
&lt;span id="xdx_828_zJK2Avg8SfW2"&gt;Share-Based Compensation&lt;/span&gt;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;&#160;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;In
2015, upon approval by the Company&#x2019;s shareholders, the Company&#x2019;s 2015 Omnibus Incentive Plan (the &#x201c;2015 Plan&#x201d;)
became effective. A total of &lt;span id="xdx_90C_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_c20151231__us-gaap--PlanNameAxis__custom--TwoThousandAndFifteenOmnibusIncentivePlanMember_pdd" title="Share-based compensation arrangement shares authorized"&gt;1,332,036&lt;/span&gt; shares were authorized for issuance under the 2015 Omnibus Incentive Plan, including shares available
for awards under the 2006 Stock Incentive Plan remaining at the time that plan terminated, or that were subject to awards under the 2006
Stock Incentive Plan that thereafter terminated by reason of expiration, forfeiture, cancellation or otherwise. If any award under the
2006 Stock Incentive Plan or 2015 Plan expires, is cancelled, terminates unexercised or is forfeited, those shares become again available
for grant under the 2015 Plan. The 2015 Plan will terminate ten years after its effective date, in October 2025, but is subject to earlier
termination as provided in the 2015 Plan. As of January 31, 2022, the Company has &lt;span id="xdx_908_eus-gaap--CommonStockCapitalSharesReservedForFutureIssuance_c20220131__us-gaap--PlanNameAxis__custom--TwoThousandAndFifteenOmnibusIncentivePlanMember_pdd" title="Capital shares reserved for future issuance"&gt;696,627&lt;/span&gt; shares available for future issuance under
the 2015 Plan which reflects adjustments made for the departure of our former CEO as well as other departures.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;On
January 18, 2018, the Company&#x2019;s Board of Directors adopted the Company&#x2019;s Employment Inducement Incentive Award Plan (the
&#x201c;2018 Inducement Plan&#x201d;) pursuant to which the Company reserved &lt;span id="xdx_902_eus-gaap--CommonStockCapitalSharesReservedForFutureIssuance_c20180118__us-gaap--PlanNameAxis__custom--TwoThousandAndEighteenInducementPlanMember_pdd" title="Capital shares reserved for future issuance"&gt;25,000&lt;/span&gt; shares of common stock for issuance under the Inducement
Plan. In accordance with Rule 711(a) of the NYSE American Company Guide, awards under the Inducement Plan may only be made to individuals
not previously employed by the Company (or following such individuals&#x2019; bona fide period of non-employment with the Company), as
an inducement material to the individuals&#x2019; entry into employment with the Company. An award is any right to receive the Company&#x2019;s
common stock pursuant to the 2018 Inducement Plan, consisting of a performance share award, restricted stock award, a restricted stock
unit award or a stock payment award. As of January 31, 2022, there were &lt;span id="xdx_90F_eus-gaap--CommonStockCapitalSharesReservedForFutureIssuance_c20220131__us-gaap--PlanNameAxis__custom--TwoThousandAndEighteenInducementPlanMember_pdd" title="Capital shares reserved for future issuance"&gt;11,487&lt;/span&gt; shares available for grant under the 2018 Inducement Plan.
On February 9, 2022 the 2018 Inducement Plan was amended to increase the authorized shares by &lt;span id="xdx_901_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_iI_pid_c20220208__us-gaap--PlanNameAxis__custom--TwoThousandAndEighteenInducementPlanMember_zTufnVQDbdfb" title="Share-based compensation arrangement shares authorized"&gt;250,000&lt;/span&gt; to &lt;span id="xdx_904_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_iI_pid_c20220209__us-gaap--PlanNameAxis__custom--TwoThousandAndEighteenInducementPlanMember_zaFhKeiXz2Sf" title="Share-based compensation arrangement shares authorized"&gt;275,000&lt;/span&gt;.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"/&gt;



&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;i&gt;Stock
Options&lt;/i&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;The
Company estimates the fair value of each stock option award granted with service-based vesting requirements, using the Black-Scholes
option pricing model, assuming no dividends, and using the weighted average valuation assumptions noted in the following table. The risk-free
rate is based on the US Treasury yield curve in effect at the time of grant. The expected life (estimated period of time outstanding)
of the stock options granted is estimated using the &#x201c;simplified&#x201d; method as permitted by the SEC&#x2019;s Staff Accounting
Bulletin No. 110, &lt;i&gt;Share-Based Payment.&lt;/i&gt; Expected volatility is based on the Company&#x2019;s historical volatility over the expected
life of the stock option granted. The Company granted options to acquire &lt;span id="xdx_909_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_pid_c20211101__20220131__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zAZgXjAhasJ1"&gt;793,850
&lt;/span&gt;&lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;and &lt;span id="xdx_901_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_pid_c20200501__20210131__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zqqZtjTtbJk9"&gt;248,876
&lt;/span&gt;&lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;shares of stock options during
the three and nine months ended January 31, 2022 and 2021, respectively. The following assumptions were used to value the awards:&lt;/span&gt;&lt;/p&gt;

&lt;p id="xdx_890_eus-gaap--ScheduleOfAssumptionsUsedTableTextBlock_z8EiUHTn0w23" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;span id="xdx_8B3_zWaD8s0syXn3" style="display: none"&gt;Schedule
of Valuation Assumptions&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%"&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="6" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Nine
    months ended January 31,&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2022&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2021&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 64%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Risk-free
    interest rate&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span id="xdx_90B_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_pid_dp_uPure_c20210501__20220131__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zqQydPnN40E3" title="Risk-free interest rate"&gt;1.5&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;%&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span id="xdx_904_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_pid_dp_uPure_c20200501__20210131__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zrCiQQnB8bR3" title="Risk-free interest rate"&gt;6.0&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;%&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Expected
    dividend yield&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_983_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_pid_dp_uPure_c20210501__20220131__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zWTySAUWOzV7" style="font: 10pt Times New Roman, Times, Serif; text-align: right" title="Expected dividend yield"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1367"&gt;&#x2014;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;%&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_980_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_pid_dp_uPure_c20200501__20210131__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zel3u5Dy7gy7" style="font: 10pt Times New Roman, Times, Serif; text-align: right" title="Expected dividend yield"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1369"&gt;&#x2014;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;%&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Expected
    life (in years)&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span id="xdx_90E_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_dtY_c20210501__20220131__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zdJIGWaFClLg" style="font-family: Times New Roman, Times, Serif; font-size: 10pt" title="Expected life (in years)"&gt;5.6&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span id="xdx_90F_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_dtY_c20200501__20210131__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_z0xdwpHQxkv" style="font-family: Times New Roman, Times, Serif; font-size: 10pt" title="Expected life (in years)"&gt;5.9&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Expected
    volatility&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span id="xdx_90E_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_pid_dp_uPure_c20210501__20220131__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_z6HtrJ1CpUp2" title="Expected volatility"&gt;121.9&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;%&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span id="xdx_906_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_pid_dp_uPure_c20200501__20210131__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zL99UmdIUMP1" title="Expected volatility"&gt;136.5&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;%&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

&lt;p id="xdx_8AE_zpvZwbbiFL1f" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p id="xdx_899_eus-gaap--ScheduleOfShareBasedCompensationActivityTableTextBlock_zNdOtyMulPaf" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;A
summary of stock options under our stock incentive plans is detailed in the following table.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;span id="xdx_8B3_zIs0aCObVAve" style="display: none"&gt;Schedule of Stock Option Activity&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%"&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;Shares
                                            &lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;Underlying
         &lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;Options
         &lt;/b&gt;&lt;/span&gt;&lt;/p&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;Weighted&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;Average&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;Exercise&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;Price&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;Weighted&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;Average&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;Remaining&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;Contractual&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;Term&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;(In
                                            Years)&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 45%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Outstanding
    as of April 30, 2021&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_983_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_iS_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--StockIncentivePlanMember_zsgUbprFPaO2" style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right" title="Shares Underlying Options Outstanding, Beginning"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;516,827&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_982_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_iS_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--StockIncentivePlanMember_zxx2fXTAKgp3" style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right" title="Weighted Average Exercise Price, Beginning Balance"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;3.89&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span id="xdx_904_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_dtY_c20210501__20220131__us-gaap--AwardTypeAxis__custom--StockIncentivePlanMember_zalNpmAWqtF6" title="Weighted Average Remaining Contractual Term (In Years), Beginning"&gt;9.0&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Granted&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_980_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--StockIncentivePlanMember_zpk2SKgMqdof" style="font: 10pt Times New Roman, Times, Serif; text-align: right" title="Shares Underlying Options Outstanding, Granted"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;793,850&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_980_eus-gaap--ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--StockIncentivePlanMember_zaVeoxKQSUuc" style="font: 10pt Times New Roman, Times, Serif; text-align: right" title="Weighted Average Exercise Price, Granted"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;1.43&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Exercised&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_987_eus-gaap--StockIssuedDuringPeriodSharesStockOptionsExercised_iN_pid_di_c20210501__20220131__us-gaap--AwardTypeAxis__custom--StockIncentivePlanMember_zVEVDtjjACXf" style="font: 10pt Times New Roman, Times, Serif; text-align: right" title="Shares Underlying Options Outstanding, Exercised"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;(44,332&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;)&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98B_eus-gaap--ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--StockIncentivePlanMember_zic6HjZfnAz2" style="font: 10pt Times New Roman, Times, Serif; text-align: right" title="Weighted Average Exercise Price, Exercised"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;1.05&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Expired&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_985_ecustom--StockIssuedDuringPeriodSharesStockOptionsExpired_iN_pid_di_c20210501__20220131__us-gaap--AwardTypeAxis__custom--StockIncentivePlanMember_zyUOaKcFuSQ3" style="font: 10pt Times New Roman, Times, Serif; text-align: right" title="Shares Underlying Options Outstanding, Expired"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;(1,806&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;)&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_983_eus-gaap--ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--StockIncentivePlanMember_zZdWbUWpn40a" style="font: 10pt Times New Roman, Times, Serif; text-align: right" title="Weighted Average Exercise Price, Expired"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;32.62&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Cancelled/forfeited&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_984_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod_iN_pid_di_c20210501__20220131__us-gaap--AwardTypeAxis__custom--StockIncentivePlanMember_zTEKDg1m29N9" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Shares Underlying Options Outstanding, Cancelled/forfeited"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;(121,383&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;)&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98E_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--StockIncentivePlanMember_znSHA7Zii22i" style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt; text-align: right" title="Weighted Average Exercise Price, Cancelled/forfeited"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;3.03&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Outstanding
    as of January 31, 2022&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_987_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_iE_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--StockIncentivePlanMember_znfZs9B7YiEe" style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Shares Underlying Options Outstanding, Ending"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;1,143,156&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_986_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_iE_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--StockIncentivePlanMember_zxHMIyUQh2Dc" style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: right" title="Weighted Average Exercise Price, Ending Balance"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2.34&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span id="xdx_905_ecustom--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm_dtY_c20210501__20220131__us-gaap--AwardTypeAxis__custom--StockIncentivePlanMember_z386QtOBAAAk" title="Weighted Average Remaining Contractual Term (In Years), Ending"&gt;9.4&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Exercisable
    as of January 31, 2022&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_988_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_iI_pid_c20220131__us-gaap--AwardTypeAxis__custom--StockIncentivePlanMember_z9Ya0TtZtO6i" style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Shares Underlying Options Outstanding, Exercisable at Ending"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;308,481&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_989_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_iI_pid_c20220131__us-gaap--AwardTypeAxis__custom--StockIncentivePlanMember_zade9x7Yfja" style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: right" title="Weighted Average Exercise Price, Exercisable at Ending"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;4.59&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span id="xdx_907_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_dtY_c20210501__20220131__us-gaap--AwardTypeAxis__custom--StockIncentivePlanMember_zCvtrEkhkB66" title="Weighted Average Remaining Contractual Term (In Years), Exercisable at Ending"&gt;8.1&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

&lt;p id="xdx_8A0_zdAmDOFbz0ph" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;As
of January 31, 2022, the total intrinsic value of outstanding and exercisable options was approximately $&lt;span id="xdx_900_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_iI_pp0p0_c20220131__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_z4rzomtctzBd" title="Intrinsic value of outstanding and exercisable options"&gt;11,560&lt;/span&gt;. As of January 31, 2022,
approximately &lt;span id="xdx_907_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares_iI_pid_c20220131__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_z1VT3kRgCgZg" title="Options unvested"&gt;835,000&lt;/span&gt; additional options were unvested, which had an intrinsic value of &lt;span id="xdx_904_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_iI_pp0p0_do_c20220131__us-gaap--AwardTypeAxis__custom--EmployeeStockOptionOneMember_zPDtyXZ4Benl" title="Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value"&gt;zero&lt;/span&gt; and a weighted average remaining contractual
term of &lt;span id="xdx_909_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1_dtY_c20210501__20220131__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zxPHN8j3Ykqb" title="Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term"&gt;9.9&lt;/span&gt; years. There was approximately $&lt;span id="xdx_900_eus-gaap--AllocatedShareBasedCompensationExpense_pp0p0_c20210501__20220131__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zcr1ZBL2qg98" title="Share-based payment arrangement, expense"&gt;183,000&lt;/span&gt; and $&lt;span id="xdx_903_eus-gaap--AllocatedShareBasedCompensationExpense_pp0p0_c20200501__20210131__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_ztO1SMZ7NYZ3" title="Share-based payment arrangement, expense"&gt;296,000&lt;/span&gt; of total recognized compensation cost related to stock options during
each of the nine months ended January 31, 2022 and 2021, respectively. As of January 31, 2022, there was approximately $&lt;span id="xdx_900_eus-gaap--EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions_iI_pp0p0_c20220131__us-gaap--AwardTypeAxis__custom--NonVestedStockMember_zEXvKiBjJk5" title="Unrecognized compensation cost related to non-vested stock"&gt;102,000&lt;/span&gt; of total
unrecognized compensation cost related to non-vested stock options granted under the plans. This cost is expected to be recognized over
a weighted-average period of &lt;span id="xdx_900_eus-gaap--EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_dtY_c20210501__20220131__us-gaap--AwardTypeAxis__custom--NonVestedStockMember_zMQJfGt4PHm3" title="Share-based compensation of weighted-average period"&gt;1.0&lt;/span&gt; year.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;The
Company&#x2019;s acquisition of 3Dent (See Note 18) was valued at the fair value of the stock on the acquisition date of $&lt;span id="xdx_90D_ecustom--FairValueOfBasePurchasePrice_iI_pp0p0_c20210201__us-gaap--BusinessAcquisitionAxis__custom--ThreeDentAcquisitionMember_zAcoJdLPEEF2"&gt;1,451,584
&lt;/span&gt;&lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;(&lt;span id="xdx_902_eus-gaap--StockIssuedDuringPeriodSharesNewIssues_pid_c20210130__20210201__us-gaap--BusinessAcquisitionAxis__custom--ThreeDentAcquisitionMember_zQBRKKv72pUg"&gt;361,991
&lt;/span&gt;&lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;shares at $&lt;span id="xdx_907_eus-gaap--BusinessAcquisitionSharePrice_iI_pid_c20210201__us-gaap--BusinessAcquisitionAxis__custom--ThreeDentAcquisitionMember_zGyxaEbaEwfj"&gt;4.01&lt;/span&gt;&lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;).
Since the share restrictions were set to expire on February 1, 2022, within one year of the closing of the acquisition,
and lacked marketability, the Company applied a 20% discount to the purchase price making the adjusted fair value $&lt;span id="xdx_90F_ecustom--AdjustedFairValue_iI_pp0p0_c20210201__us-gaap--BusinessAcquisitionAxis__custom--ThreeDentAcquisitionMember_z6IWXjXgR8Za" title="Fair Value of Purchase"&gt;1,161,267&lt;/span&gt;&lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;.
Additionally, as the sellers must be employed for 12 months from the date of acquisition to retain all of their shares, the difference
between the calculated fair value and the net assets acquired represents the value of the compensation expense to be recognized over
the period of the agreed upon employment.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"/&gt;



&lt;p id="xdx_89E_ecustom--ScheduleOfBusinessAcquisitionAndFairValueOfNetAssetsCompensationExpenseRecognized_zu1LsraQHi47" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;span id="xdx_8B7_zVIRlnvi8VIa" style="display: none"&gt;Schedule of Business Acquisition and Fair Value of Net Assets, Compensation Expense Recognized&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%"&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 80%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Fair
    Value of Purchase&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_985_ecustom--AdjustedFairValue_iI_pp0p0_c20210201__us-gaap--BusinessAcquisitionAxis__custom--ThreeDentAcquisitionMember_z1HaqeEVrnDl" style="font: 10pt Times New Roman, Times, Serif; width: 16%; text-align: right" title="Fair Value of Purchase"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;1,161,267&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Total
    Acquired Assets&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_988_eus-gaap--BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_iNI_pp0p0_di_c20210201__us-gaap--BusinessAcquisitionAxis__custom--ThreeDentAcquisitionMember_zwtrNIbtnlr" style="font: 10pt Times New Roman, Times, Serif; text-align: right" title="Total Acquired Assets"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;(593,571&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;)&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Total
    Acquired Liabilities&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_980_eus-gaap--BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_c20210201__us-gaap--BusinessAcquisitionAxis__custom--ThreeDentAcquisitionMember_pp0p0" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Total Acquired Liabilities"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;117,106&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Compensation
    Expense&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_987_ecustom--BusinessComibinationCompensationExpensesRecognized_c20210201__us-gaap--BusinessAcquisitionAxis__custom--ThreeDentAcquisitionMember_pp0p0" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Compensation Expense"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;684,802&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Quarterly
    Compensation Expense&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98F_ecustom--BusinessComibinationQuarterlyCompensationExpensesRecognized_c20210201__us-gaap--BusinessAcquisitionAxis__custom--ThreeDentAcquisitionMember_pp0p0" style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Quarterly Compensation Expense"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;171,201&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

&lt;p id="xdx_8AD_zQNuBmqABTW6" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;The
Company has recognized approximately $&lt;span id="xdx_90D_ecustom--BusinessComibinationQuarterlyCompensationExpensesConsiderationPaid_iI_pp0p0_c20210201__us-gaap--BusinessAcquisitionAxis__custom--ThreeDentAcquisitionMember_zjRKvmVxsrB8"&gt;171,000
&lt;/span&gt;&lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;of compensation expense on a quarterly basis
for the consideration paid for 12 months from the acquisition date of February 2, 2021. The last of this compensation expense was
recognized during the quarter ended January 31, 2022.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;i&gt;Performance
Stock Options&lt;/i&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;In
January 2020, the Company issued &lt;span id="xdx_907_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_pid_c20200101__20200131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember__srt--TitleOfIndividualAxis__custom--TwoExecutivesMember_zXsNMBhtuj13" title="Share-based compensation options, grants in period, gross"&gt;81,337&lt;/span&gt; performance-based stock options to two of its executives. There were &lt;span id="xdx_903_ecustom--ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesVestedAndOutstanding_pid_c20200101__20200131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zo36TUwD8eAb" title="Shares vested and outstanding"&gt;40,668&lt;/span&gt; shares that were
vested and outstanding, which were set to expire on &lt;span id="xdx_902_eus-gaap--DebtInstrumentMaturityDate_dd_c20200101__20200131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zWrbzjEny6qb" title="Debt expire date"&gt;December 15, 2021&lt;/span&gt;, all of which were exercised prior to the expiration date.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;In
January 2021, the Company issued &lt;span id="xdx_906_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_c20210101__20210131__srt--TitleOfIndividualAxis__custom--EmployeesAndExecutivesMember__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_z0Qxs80nHFF8" title="Share-based compensation options, grants in period, gross"&gt;344,723&lt;/span&gt; performance-based stock options to employees and executives. &lt;span id="xdx_907_ecustom--StockOptionsVestingPeriodDescription_c20210101__20210131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember__srt--TitleOfIndividualAxis__custom--EmployeesAndExecutivesMember_zeMSnzrmH4ni" title="Stock options vesting period description"&gt;The awards vest over 2 years provided
there is positive total shareholder return (e.g. share price increase) as measured by the closing share price on January 14, 2022 and
January 14, 2023.&lt;/span&gt; There were &lt;span id="xdx_909_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember__srt--TitleOfIndividualAxis__custom--EmployeesAndExecutivesMember_zRBCSkzPuKhc" title="Share-based compensation options, grants in period, gross"&gt;230,000&lt;/span&gt; shares unvested and outstanding at January 31, 2022. None of the shares granted to our former President
and CEO under this issuance vested prior to June 18, 2021, his last day of employment. These unvested shares are included in the Cancelled/forfeited
figure in the table below. A summary of performance stock options under our stock incentive plans is detailed in the following table.&lt;/span&gt;&lt;/p&gt;

&lt;p id="xdx_89C_eus-gaap--ScheduleOfShareBasedCompensationActivityTableTextBlock_hus-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zsBGn3sj6mZ3" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span id="xdx_8BB_zwlWRkSpuRQa" style="display: none"&gt;Schedule of Stock Option Activity&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%"&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;Shares
                                            &lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;Underlying
         &lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;Options
         &lt;/b&gt;&lt;/span&gt;&lt;/p&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;Weighted&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;Average&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;Exercise&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;Price&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;Weighted&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;Average&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;Remaining&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;Contractual&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;Term&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;(In
                                            Years)&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 45%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Outstanding
    as of April 30, 2021&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98F_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_iS_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zpZOduwCR1K5" style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right" title="Shares Underlying Options Outstanding, Beginning"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;424,790&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98E_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_iS_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zWm9CAIx8hYh" style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right" title="Weighted Average Exercise Price, Beginning Balance"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2.57&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span id="xdx_907_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_dtY_c20210501__20220131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zR57w3q9OVj" title="Weighted Average Remaining Contractual Term (In Years), Beginning"&gt;9.5&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Granted&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_981_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zbLr6999tpSj" style="font: 10pt Times New Roman, Times, Serif; text-align: right" title="Shares Underlying Options Outstanding, Granted"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;66,667&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98A_eus-gaap--ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zAYnFuENvlW9" style="font: 10pt Times New Roman, Times, Serif; text-align: right" title="Weighted Average Exercise Price, Granted"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;0.62&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Exercised&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_981_eus-gaap--StockIssuedDuringPeriodSharesStockOptionsExercised_iN_pid_di_c20210501__20220131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zKN4XIWDSAMg" style="font: 10pt Times New Roman, Times, Serif; text-align: right" title="Shares Underlying Options Outstanding, Exercised"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;(40,668&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;)&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98F_eus-gaap--ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zO5LvWqHy7bd" style="font: 10pt Times New Roman, Times, Serif; text-align: right" title="Weighted Average Exercise Price, Exercised"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;1.05&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Cancelled/forfeited&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_981_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod_iN_pid_di_c20210501__20220131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zzC8R4uvYmF" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Shares Underlying Options Outstanding, Cancelled/forfeited"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;(220,766&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;)&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_981_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zKLpt4Sljkl1" style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt; text-align: right" title="Weighted Average Exercise Price, Cancelled/forfeited"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2.58&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Outstanding
    as of January 31, 2022&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98C_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_iE_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_z0YVn8VoTCR2" style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Shares Underlying Options Outstanding, Ending"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;230,023&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98F_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_iE_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zmjJERO74tbh" style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: right" title="Weighted Average Exercise Price, Ending Balance"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2.26&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span id="xdx_908_ecustom--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm_dtY_c20210501__20220131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zgrPuzbbED14" title="Weighted Average Remaining Contractual Term (In Years), Ending"&gt;9.1&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Exercisable
    as of January 31, 2022&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_981_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_iI_pid_c20220131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zRwUilKWg8f6" style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Shares Underlying Options Outstanding, Exercisable at Ending"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1487"&gt;&#x2014;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span id="xdx_904_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_dtY_c20210501__20220131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zYkatqvHiQX3" title="Weighted Average Remaining Contractual Term (In Years), Exercisable at Ending"&gt;0.0&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

&lt;p id="xdx_8A2_zfrN1x4xjgbk" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;As
of January 31, 2022, the total intrinsic value of both outstanding and exercisable options was approximately &lt;span id="xdx_90C_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_iI_dc_c20220131__us-gaap--AwardTypeAxis__us-gaap--PerformanceSharesMember_zBEQ89GLkmud"&gt;zero&lt;/span&gt;&lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;.
As of January 31, 2022, approximately &lt;span id="xdx_90A_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares_iI_pid_c20220131__us-gaap--AwardTypeAxis__us-gaap--PerformanceSharesMember_zWezoRw5IWR5"&gt;230,000
&lt;/span&gt;&lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;options were unvested, which had an intrinsic
value of &lt;span id="xdx_90C_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_iI_dc_c20220131__us-gaap--AwardTypeAxis__us-gaap--PerformanceSharesMember_zAOZzkuHKFl9"&gt;zero
&lt;/span&gt;&lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;and a weighted average remaining contractual
term of &lt;span id="xdx_900_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1_dtY_c20210501__20220131__us-gaap--AwardTypeAxis__us-gaap--PerformanceSharesMember_zUFeUbgg79Jj"&gt;9.1
&lt;/span&gt;&lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;years. There was approximately $&lt;span id="xdx_90C_eus-gaap--AllocatedShareBasedCompensationExpense_pp0p0_c20210501__20220131__us-gaap--AwardTypeAxis__us-gaap--PerformanceSharesMember_z9L4OV1YLVwc"&gt;123,000
&lt;/span&gt;&lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;and $&lt;span id="xdx_90E_eus-gaap--AllocatedShareBasedCompensationExpense_pp0p0_c20200501__20210131__us-gaap--AwardTypeAxis__us-gaap--PerformanceSharesMember_zc9oB0U8TA89"&gt;43,000
&lt;/span&gt;&lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;of total recognized compensation cost related
to stock options during each of the nine months ended January 31, 2022 and 2021, respectively. As of January 31, 2022, there was approximately
$&lt;span id="xdx_905_eus-gaap--EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions_c20220131__us-gaap--AwardTypeAxis__us-gaap--PerformanceSharesMember_pn5n6"&gt;242,000
&lt;/span&gt;&lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;of total unrecognized compensation cost related
to non-vested stock options granted under the plans. This cost is expected to be recognized over a weighted-average period of &lt;span id="xdx_904_eus-gaap--EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_dtY_c20210501__20220131__us-gaap--AwardTypeAxis__us-gaap--PerformanceSharesMember_z0YGbXUIF6Ff"&gt;1.1
&lt;/span&gt;&lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;years.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;i&gt;Restricted
Stock&lt;/i&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Compensation
expense for non-vested restricted stock is generally recorded based on its market value on the date of grant and recognized ratably over
the associated service and performance period. During the nine months ended January 31, 2022 and 2021, the Company granted &lt;span id="xdx_904_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_zLyL07jC0jc"&gt;777,764
&lt;/span&gt;&lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;and &lt;span id="xdx_902_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_pid_c20200501__20210131__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_z6jh4LrEkM9k"&gt;10,000
&lt;/span&gt;&lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;shares,&lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;
respectively, that were subject to service-based vesting requirements.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"/&gt;



&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p id="xdx_893_eus-gaap--ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityTableTextBlock_zQuOLPwbSsAg" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;A
summary of non-vested restricted stock under our stock incentive plans is as follows:&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;span id="xdx_8B0_zvGSHaVa6s6a" style="display: none"&gt;Schedule of Non-vested Restricted Stock Activity&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%"&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;Number&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"/&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;of
                                            Shares&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;Weighted&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"/&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;Average
                                            Price per&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"/&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;Share&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 64%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Issued
    and unvested at April 30, 2021&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_983_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_iS_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_ze7Z2QDf8j2b" style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right" title="Number of Shares, Issued and unvested, Beginning"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;10,000&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98F_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_iS_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_zoRAJ945JUeb" style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right" title="Weighted Average Price per Share, Issued and Unvested, Beginning"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2.93&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Granted&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98D_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_zRQBpF0rN3bk" style="font: 10pt Times New Roman, Times, Serif; text-align: right" title="Number of Shares, Granted"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;777,764&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_983_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_zGuHf0UmNwua" style="font: 10pt Times New Roman, Times, Serif; text-align: right" title="Weighted Average Price per Share, Granted"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;1.42&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Vested&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98C_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_iN_pid_di_c20210501__20220131__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_zzacWTXXIQn2" style="font: 10pt Times New Roman, Times, Serif; text-align: right" title="Number of Shares, Vested"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;(10,000&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;)&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_986_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_zQQYIdEqq0p4" style="font: 10pt Times New Roman, Times, Serif; text-align: right" title="Weighted Average Price per Share, Vested"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2.93&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Cancelled/forfeited&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_981_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_zDeqjNnbT3si" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Number of Shares, Cancelled/forfeited"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1515"&gt;&#x2014;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_980_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_zpLKFWhk7Rx9" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Weighted Average Price per Share, Cancelled/forfeited"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1517"&gt;&#x2014;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Issued
    and unvested at January 31, 2022&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_980_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_iE_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_z6uC7agcOCD" style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Number of Shares, Issued and Unvested, Ending"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;777,764&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_982_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_iE_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_z3ZlSS1WJbF2" style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Weighted Average Price per Share, Issued and Unvested, Ending"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;1.42&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

&lt;p id="xdx_8A8_z0ybN5zc3oi4" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;There
was approximately $&lt;span id="xdx_906_eus-gaap--AllocatedShareBasedCompensationExpense_pp0p0_c20210501__20220131__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_zBcwBrnBDoW6" title="Share-based payment arrangement, expense"&gt;43,000&lt;/span&gt;
and $&lt;span id="xdx_905_eus-gaap--AllocatedShareBasedCompensationExpense_pp0p0_c20200501__20210131__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_zXYEprwGorLf" title="Share-based payment arrangement, expense"&gt;12,000&lt;/span&gt;
of total recognized compensation cost related to restricted stock for the nine months ended January 31, 2022 and 2021, respectively.
As of January 31, 2022, there is approximately $&lt;span id="xdx_902_eus-gaap--EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_iI_pp0p0_c20220131__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_z7800wMVYQUl" title="Unrecognized compensation cost"&gt;54,000&lt;/span&gt;
of unrecognized compensation cost remaining related to unvested restricted stock granted under our plans. This cost is expected to
be recognized over a weighted-average period of approximately &lt;span id="xdx_903_eus-gaap--EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_dtY_c20210501__20220131__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_zeU7becczWZ6" title="Share-based compensation of weighted-average period"&gt;1.4&lt;/span&gt;
years.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;In
December 2019, the Company granted &lt;span id="xdx_90B_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_pid_c20210501__20220131__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember__srt--TitleOfIndividualAxis__custom--EmployeeMember__srt--StatementScenarioAxis__custom--SubjectToServiceBasedVestingRequirementsMember_zZCWVPmFWna" title="Restricted stock option granted"&gt;51,547&lt;/span&gt; shares to an employee, subject to service-based vesting requirements, that were outside the
Company stock incentive plans. There was approximately &lt;span id="xdx_904_eus-gaap--AllocatedShareBasedCompensationExpense_pp0p0_dc_c20210501__20220131__us-gaap--AwardTypeAxis__us-gaap--StockOptionMember__srt--TitleOfIndividualAxis__custom--EmployeeMember__srt--StatementScenarioAxis__custom--SubjectToServiceBasedVestingRequirementsMember_zQwlTKbGZKA8" title="Share-based payment arrangement, expense"&gt;zero&lt;/span&gt; and $&lt;span id="xdx_90D_eus-gaap--AllocatedShareBasedCompensationExpense_pp0p0_c20200501__20210131__us-gaap--AwardTypeAxis__us-gaap--StockOptionMember__srt--TitleOfIndividualAxis__custom--EmployeeMember__srt--StatementScenarioAxis__custom--SubjectToServiceBasedVestingRequirementsMember_zReJgHF5df49" title="Share-based payment arrangement, expense"&gt;30,000&lt;/span&gt; of total recognized compensation cost related to this award for
the three months ended January 31, 2022 and 2021, respectively. As of January 31, 2022, there was &lt;span id="xdx_904_eus-gaap--EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions_iI_pp0p0_do_c20220131__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember__srt--TitleOfIndividualAxis__custom--EmployeeMember__srt--StatementScenarioAxis__custom--SubjectToServiceBasedVestingRequirementsMember_zazTO3GsWw7f" title="Unrecognized compensation cost related to non-vested stock"&gt;no&lt;/span&gt; unrecognized compensation cost remaining
related to this award.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

</us-gaap:DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock>
    <us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
      contextRef="AsOf2015-12-31_custom_TwoThousandAndFifteenOmnibusIncentivePlanMember"
      decimals="INF"
      unitRef="Shares">1332036</us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized>
    <us-gaap:CommonStockCapitalSharesReservedForFutureIssuance
      contextRef="AsOf2022-01-31_custom_TwoThousandAndFifteenOmnibusIncentivePlanMember"
      decimals="INF"
      unitRef="Shares">696627</us-gaap:CommonStockCapitalSharesReservedForFutureIssuance>
    <us-gaap:CommonStockCapitalSharesReservedForFutureIssuance
      contextRef="AsOf2018-01-18_custom_TwoThousandAndEighteenInducementPlanMember"
      decimals="INF"
      unitRef="Shares">25000</us-gaap:CommonStockCapitalSharesReservedForFutureIssuance>
    <us-gaap:CommonStockCapitalSharesReservedForFutureIssuance
      contextRef="AsOf2022-01-31_custom_TwoThousandAndEighteenInducementPlanMember"
      decimals="INF"
      unitRef="Shares">11487</us-gaap:CommonStockCapitalSharesReservedForFutureIssuance>
    <us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
      contextRef="AsOf2022-02-08_custom_TwoThousandAndEighteenInducementPlanMember"
      decimals="INF"
      unitRef="Shares">250000</us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized>
    <us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
      contextRef="AsOf2022-02-09_custom_TwoThousandAndEighteenInducementPlanMember"
      decimals="INF"
      unitRef="Shares">275000</us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized>
    <us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
      contextRef="From2021-11-012022-01-31_us-gaap_EmployeeStockOptionMember"
      decimals="INF"
      unitRef="Shares">793850</us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross>
    <us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
      contextRef="From2020-05-012021-01-31_us-gaap_EmployeeStockOptionMember"
      decimals="INF"
      unitRef="Shares">248876</us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross>
    <us-gaap:ScheduleOfAssumptionsUsedTableTextBlock contextRef="From2021-05-01to2022-01-31">&lt;p id="xdx_890_eus-gaap--ScheduleOfAssumptionsUsedTableTextBlock_z8EiUHTn0w23" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;span id="xdx_8B3_zWaD8s0syXn3" style="display: none"&gt;Schedule
of Valuation Assumptions&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%"&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="6" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Nine
    months ended January 31,&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2022&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2021&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 64%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Risk-free
    interest rate&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span id="xdx_90B_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_pid_dp_uPure_c20210501__20220131__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zqQydPnN40E3" title="Risk-free interest rate"&gt;1.5&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;%&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span id="xdx_904_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_pid_dp_uPure_c20200501__20210131__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zrCiQQnB8bR3" title="Risk-free interest rate"&gt;6.0&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;%&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Expected
    dividend yield&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_983_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_pid_dp_uPure_c20210501__20220131__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zWTySAUWOzV7" style="font: 10pt Times New Roman, Times, Serif; text-align: right" title="Expected dividend yield"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1367"&gt;&#x2014;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;%&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_980_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_pid_dp_uPure_c20200501__20210131__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zel3u5Dy7gy7" style="font: 10pt Times New Roman, Times, Serif; text-align: right" title="Expected dividend yield"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1369"&gt;&#x2014;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;%&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Expected
    life (in years)&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span id="xdx_90E_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_dtY_c20210501__20220131__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zdJIGWaFClLg" style="font-family: Times New Roman, Times, Serif; font-size: 10pt" title="Expected life (in years)"&gt;5.6&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span id="xdx_90F_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_dtY_c20200501__20210131__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_z0xdwpHQxkv" style="font-family: Times New Roman, Times, Serif; font-size: 10pt" title="Expected life (in years)"&gt;5.9&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Expected
    volatility&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span id="xdx_90E_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_pid_dp_uPure_c20210501__20220131__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_z6HtrJ1CpUp2" title="Expected volatility"&gt;121.9&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;%&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span id="xdx_906_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_pid_dp_uPure_c20200501__20210131__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zL99UmdIUMP1" title="Expected volatility"&gt;136.5&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;%&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

</us-gaap:ScheduleOfAssumptionsUsedTableTextBlock>
    <us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
      contextRef="From2021-05-012022-01-31_us-gaap_EmployeeStockOptionMember"
      decimals="INF"
      unitRef="Pure">0.015</us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate>
    <us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
      contextRef="From2020-05-012021-01-31_us-gaap_EmployeeStockOptionMember"
      decimals="INF"
      unitRef="Pure">0.060</us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate>
    <us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1 contextRef="From2021-05-012022-01-31_us-gaap_EmployeeStockOptionMember">P5Y7M6D</us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1>
    <us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1 contextRef="From2020-05-012021-01-31_us-gaap_EmployeeStockOptionMember">P5Y10M24D</us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1>
    <us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
      contextRef="From2021-05-012022-01-31_us-gaap_EmployeeStockOptionMember"
      decimals="INF"
      unitRef="Pure">1.219</us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate>
    <us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
      contextRef="From2020-05-012021-01-31_us-gaap_EmployeeStockOptionMember"
      decimals="INF"
      unitRef="Pure">1.365</us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate>
    <us-gaap:ScheduleOfShareBasedCompensationActivityTableTextBlock contextRef="From2021-05-01to2022-01-31">&lt;p id="xdx_899_eus-gaap--ScheduleOfShareBasedCompensationActivityTableTextBlock_zNdOtyMulPaf" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;A
summary of stock options under our stock incentive plans is detailed in the following table.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;span id="xdx_8B3_zIs0aCObVAve" style="display: none"&gt;Schedule of Stock Option Activity&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%"&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;Shares
                                            &lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;Underlying
         &lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;Options
         &lt;/b&gt;&lt;/span&gt;&lt;/p&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;Weighted&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;Average&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;Exercise&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;Price&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;Weighted&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;Average&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;Remaining&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;Contractual&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;Term&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;(In
                                            Years)&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 45%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Outstanding
    as of April 30, 2021&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_983_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_iS_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--StockIncentivePlanMember_zsgUbprFPaO2" style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right" title="Shares Underlying Options Outstanding, Beginning"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;516,827&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_982_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_iS_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--StockIncentivePlanMember_zxx2fXTAKgp3" style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right" title="Weighted Average Exercise Price, Beginning Balance"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;3.89&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span id="xdx_904_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_dtY_c20210501__20220131__us-gaap--AwardTypeAxis__custom--StockIncentivePlanMember_zalNpmAWqtF6" title="Weighted Average Remaining Contractual Term (In Years), Beginning"&gt;9.0&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Granted&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_980_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--StockIncentivePlanMember_zpk2SKgMqdof" style="font: 10pt Times New Roman, Times, Serif; text-align: right" title="Shares Underlying Options Outstanding, Granted"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;793,850&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_980_eus-gaap--ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--StockIncentivePlanMember_zaVeoxKQSUuc" style="font: 10pt Times New Roman, Times, Serif; text-align: right" title="Weighted Average Exercise Price, Granted"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;1.43&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Exercised&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_987_eus-gaap--StockIssuedDuringPeriodSharesStockOptionsExercised_iN_pid_di_c20210501__20220131__us-gaap--AwardTypeAxis__custom--StockIncentivePlanMember_zVEVDtjjACXf" style="font: 10pt Times New Roman, Times, Serif; text-align: right" title="Shares Underlying Options Outstanding, Exercised"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;(44,332&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;)&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98B_eus-gaap--ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--StockIncentivePlanMember_zic6HjZfnAz2" style="font: 10pt Times New Roman, Times, Serif; text-align: right" title="Weighted Average Exercise Price, Exercised"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;1.05&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Expired&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_985_ecustom--StockIssuedDuringPeriodSharesStockOptionsExpired_iN_pid_di_c20210501__20220131__us-gaap--AwardTypeAxis__custom--StockIncentivePlanMember_zyUOaKcFuSQ3" style="font: 10pt Times New Roman, Times, Serif; text-align: right" title="Shares Underlying Options Outstanding, Expired"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;(1,806&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;)&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_983_eus-gaap--ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--StockIncentivePlanMember_zZdWbUWpn40a" style="font: 10pt Times New Roman, Times, Serif; text-align: right" title="Weighted Average Exercise Price, Expired"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;32.62&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Cancelled/forfeited&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_984_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod_iN_pid_di_c20210501__20220131__us-gaap--AwardTypeAxis__custom--StockIncentivePlanMember_zTEKDg1m29N9" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Shares Underlying Options Outstanding, Cancelled/forfeited"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;(121,383&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;)&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98E_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--StockIncentivePlanMember_znSHA7Zii22i" style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt; text-align: right" title="Weighted Average Exercise Price, Cancelled/forfeited"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;3.03&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Outstanding
    as of January 31, 2022&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_987_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_iE_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--StockIncentivePlanMember_znfZs9B7YiEe" style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Shares Underlying Options Outstanding, Ending"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;1,143,156&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_986_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_iE_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--StockIncentivePlanMember_zxHMIyUQh2Dc" style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: right" title="Weighted Average Exercise Price, Ending Balance"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2.34&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span id="xdx_905_ecustom--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm_dtY_c20210501__20220131__us-gaap--AwardTypeAxis__custom--StockIncentivePlanMember_z386QtOBAAAk" title="Weighted Average Remaining Contractual Term (In Years), Ending"&gt;9.4&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Exercisable
    as of January 31, 2022&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_988_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_iI_pid_c20220131__us-gaap--AwardTypeAxis__custom--StockIncentivePlanMember_z9Ya0TtZtO6i" style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Shares Underlying Options Outstanding, Exercisable at Ending"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;308,481&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_989_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_iI_pid_c20220131__us-gaap--AwardTypeAxis__custom--StockIncentivePlanMember_zade9x7Yfja" style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: right" title="Weighted Average Exercise Price, Exercisable at Ending"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;4.59&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span id="xdx_907_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_dtY_c20210501__20220131__us-gaap--AwardTypeAxis__custom--StockIncentivePlanMember_zCvtrEkhkB66" title="Weighted Average Remaining Contractual Term (In Years), Exercisable at Ending"&gt;8.1&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

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&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%"&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 80%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Fair
    Value of Purchase&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_985_ecustom--AdjustedFairValue_iI_pp0p0_c20210201__us-gaap--BusinessAcquisitionAxis__custom--ThreeDentAcquisitionMember_z1HaqeEVrnDl" style="font: 10pt Times New Roman, Times, Serif; width: 16%; text-align: right" title="Fair Value of Purchase"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;1,161,267&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Total
    Acquired Assets&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_988_eus-gaap--BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_iNI_pp0p0_di_c20210201__us-gaap--BusinessAcquisitionAxis__custom--ThreeDentAcquisitionMember_zwtrNIbtnlr" style="font: 10pt Times New Roman, Times, Serif; text-align: right" title="Total Acquired Assets"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;(593,571&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;)&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Total
    Acquired Liabilities&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_980_eus-gaap--BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_c20210201__us-gaap--BusinessAcquisitionAxis__custom--ThreeDentAcquisitionMember_pp0p0" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Total Acquired Liabilities"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;117,106&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Compensation
    Expense&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_987_ecustom--BusinessComibinationCompensationExpensesRecognized_c20210201__us-gaap--BusinessAcquisitionAxis__custom--ThreeDentAcquisitionMember_pp0p0" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Compensation Expense"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;684,802&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Quarterly
    Compensation Expense&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98F_ecustom--BusinessComibinationQuarterlyCompensationExpensesRecognized_c20210201__us-gaap--BusinessAcquisitionAxis__custom--ThreeDentAcquisitionMember_pp0p0" style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Quarterly Compensation Expense"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;171,201&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

</OPTT:ScheduleOfBusinessAcquisitionAndFairValueOfNetAssetsCompensationExpenseRecognized>
    <OPTT:AdjustedFairValue
      contextRef="AsOf2021-02-01_custom_ThreeDentAcquisitionMember"
      decimals="0"
      unitRef="USD">1161267</OPTT:AdjustedFairValue>
    <us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
      contextRef="AsOf2021-02-01_custom_ThreeDentAcquisitionMember"
      decimals="0"
      unitRef="USD">593571</us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets>
    <us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
      contextRef="AsOf2021-02-01_custom_ThreeDentAcquisitionMember"
      decimals="0"
      unitRef="USD">117106</us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities>
    <OPTT:BusinessComibinationCompensationExpensesRecognized
      contextRef="AsOf2021-02-01_custom_ThreeDentAcquisitionMember"
      decimals="0"
      unitRef="USD">684802</OPTT:BusinessComibinationCompensationExpensesRecognized>
    <OPTT:BusinessComibinationQuarterlyCompensationExpensesRecognized
      contextRef="AsOf2021-02-01_custom_ThreeDentAcquisitionMember"
      decimals="0"
      unitRef="USD">171201</OPTT:BusinessComibinationQuarterlyCompensationExpensesRecognized>
    <OPTT:BusinessComibinationQuarterlyCompensationExpensesConsiderationPaid
      contextRef="AsOf2021-02-01_custom_ThreeDentAcquisitionMember"
      decimals="0"
      unitRef="USD">171000</OPTT:BusinessComibinationQuarterlyCompensationExpensesConsiderationPaid>
    <us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
      contextRef="From2020-01-012020-01-31_custom_PerformanceStockOptionsMember_custom_TwoExecutivesMember"
      decimals="INF"
      unitRef="Shares">81337</us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross>
    <OPTT:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesVestedAndOutstanding
      contextRef="From2020-01-012020-01-31_custom_PerformanceStockOptionsMember"
      decimals="INF"
      unitRef="Shares">40668</OPTT:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesVestedAndOutstanding>
    <us-gaap:DebtInstrumentMaturityDate contextRef="From2020-01-012020-01-31_custom_PerformanceStockOptionsMember">2021-12-15</us-gaap:DebtInstrumentMaturityDate>
    <us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
      contextRef="From2021-01-012021-01-31_custom_EmployeesAndExecutivesMember_custom_PerformanceStockOptionsMember"
      decimals="INF"
      unitRef="Shares">344723</us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross>
    <OPTT:StockOptionsVestingPeriodDescription contextRef="From2021-01-012021-01-31_custom_EmployeesAndExecutivesMember_custom_PerformanceStockOptionsMember">The awards vest over 2 years provided
there is positive total shareholder return (e.g. share price increase) as measured by the closing share price on January 14, 2022 and
January 14, 2023.</OPTT:StockOptionsVestingPeriodDescription>
    <us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
      contextRef="From2021-05-012022-01-31_custom_PerformanceStockOptionsMember_custom_EmployeesAndExecutivesMember"
      decimals="INF"
      unitRef="Shares">230000</us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross>
    <us-gaap:ScheduleOfShareBasedCompensationActivityTableTextBlock contextRef="From2021-05-012022-01-31_custom_PerformanceStockOptionsMember">&lt;p id="xdx_89C_eus-gaap--ScheduleOfShareBasedCompensationActivityTableTextBlock_hus-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zsBGn3sj6mZ3" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span id="xdx_8BB_zwlWRkSpuRQa" style="display: none"&gt;Schedule of Stock Option Activity&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%"&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;Shares
                                            &lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;Underlying
         &lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;Options
         &lt;/b&gt;&lt;/span&gt;&lt;/p&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;Weighted&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;Average&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;Exercise&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;Price&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;Weighted&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;Average&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;Remaining&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;Contractual&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;Term&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;(In
                                            Years)&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 45%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Outstanding
    as of April 30, 2021&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98F_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_iS_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zpZOduwCR1K5" style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right" title="Shares Underlying Options Outstanding, Beginning"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;424,790&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98E_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_iS_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zWm9CAIx8hYh" style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right" title="Weighted Average Exercise Price, Beginning Balance"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2.57&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span id="xdx_907_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_dtY_c20210501__20220131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zR57w3q9OVj" title="Weighted Average Remaining Contractual Term (In Years), Beginning"&gt;9.5&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Granted&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_981_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zbLr6999tpSj" style="font: 10pt Times New Roman, Times, Serif; text-align: right" title="Shares Underlying Options Outstanding, Granted"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;66,667&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98A_eus-gaap--ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zAYnFuENvlW9" style="font: 10pt Times New Roman, Times, Serif; text-align: right" title="Weighted Average Exercise Price, Granted"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;0.62&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Exercised&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_981_eus-gaap--StockIssuedDuringPeriodSharesStockOptionsExercised_iN_pid_di_c20210501__20220131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zKN4XIWDSAMg" style="font: 10pt Times New Roman, Times, Serif; text-align: right" title="Shares Underlying Options Outstanding, Exercised"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;(40,668&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;)&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98F_eus-gaap--ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zO5LvWqHy7bd" style="font: 10pt Times New Roman, Times, Serif; text-align: right" title="Weighted Average Exercise Price, Exercised"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;1.05&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Cancelled/forfeited&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_981_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod_iN_pid_di_c20210501__20220131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zzC8R4uvYmF" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Shares Underlying Options Outstanding, Cancelled/forfeited"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;(220,766&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;)&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_981_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zKLpt4Sljkl1" style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt; text-align: right" title="Weighted Average Exercise Price, Cancelled/forfeited"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2.58&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Outstanding
    as of January 31, 2022&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98C_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_iE_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_z0YVn8VoTCR2" style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Shares Underlying Options Outstanding, Ending"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;230,023&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98F_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_iE_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zmjJERO74tbh" style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: right" title="Weighted Average Exercise Price, Ending Balance"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2.26&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span id="xdx_908_ecustom--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm_dtY_c20210501__20220131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zgrPuzbbED14" title="Weighted Average Remaining Contractual Term (In Years), Ending"&gt;9.1&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Exercisable
    as of January 31, 2022&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_981_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_iI_pid_c20220131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zRwUilKWg8f6" style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Shares Underlying Options Outstanding, Exercisable at Ending"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1487"&gt;&#x2014;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 2.5pt; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span id="xdx_904_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_dtY_c20210501__20220131__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zYkatqvHiQX3" title="Weighted Average Remaining Contractual Term (In Years), Exercisable at Ending"&gt;0.0&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

</us-gaap:ScheduleOfShareBasedCompensationActivityTableTextBlock>
    <us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
      contextRef="AsOf2021-04-30_custom_PerformanceStockOptionsMember"
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      unitRef="Shares">424790</us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber>
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      unitRef="USDPShares">2.57</us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice>
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    <us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
      contextRef="From2021-05-012022-01-31_custom_PerformanceStockOptionsMember"
      decimals="INF"
      unitRef="Shares">66667</us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross>
    <us-gaap:ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
      contextRef="From2021-05-012022-01-31_custom_PerformanceStockOptionsMember"
      decimals="INF"
      unitRef="USDPShares">0.62</us-gaap:ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice>
    <us-gaap:StockIssuedDuringPeriodSharesStockOptionsExercised
      contextRef="From2021-05-012022-01-31_custom_PerformanceStockOptionsMember"
      decimals="INF"
      unitRef="Shares">40668</us-gaap:StockIssuedDuringPeriodSharesStockOptionsExercised>
    <us-gaap:ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
      contextRef="From2021-05-012022-01-31_custom_PerformanceStockOptionsMember"
      decimals="INF"
      unitRef="USDPShares">1.05</us-gaap:ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice>
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      contextRef="From2021-05-012022-01-31_custom_PerformanceStockOptionsMember"
      decimals="INF"
      unitRef="Shares">220766</us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod>
    <us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice
      contextRef="From2021-05-012022-01-31_custom_PerformanceStockOptionsMember"
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      unitRef="USDPShares">2.58</us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice>
    <us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
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      unitRef="Shares">230023</us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber>
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summary of non-vested restricted stock under our stock incentive plans is as follows:&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;span id="xdx_8B0_zvGSHaVa6s6a" style="display: none"&gt;Schedule of Non-vested Restricted Stock Activity&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

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  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;Number&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"/&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;of
                                            Shares&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;Weighted&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"/&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;Average
                                            Price per&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"/&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;Share&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 64%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Issued
    and unvested at April 30, 2021&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_983_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_iS_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_ze7Z2QDf8j2b" style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right" title="Number of Shares, Issued and unvested, Beginning"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;10,000&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98F_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_iS_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_zoRAJ945JUeb" style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right" title="Weighted Average Price per Share, Issued and Unvested, Beginning"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2.93&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Granted&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98D_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_zRQBpF0rN3bk" style="font: 10pt Times New Roman, Times, Serif; text-align: right" title="Number of Shares, Granted"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;777,764&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_983_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_zGuHf0UmNwua" style="font: 10pt Times New Roman, Times, Serif; text-align: right" title="Weighted Average Price per Share, Granted"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;1.42&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Vested&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98C_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_iN_pid_di_c20210501__20220131__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_zzacWTXXIQn2" style="font: 10pt Times New Roman, Times, Serif; text-align: right" title="Number of Shares, Vested"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;(10,000&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;)&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_986_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_zQQYIdEqq0p4" style="font: 10pt Times New Roman, Times, Serif; text-align: right" title="Weighted Average Price per Share, Vested"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;2.93&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Cancelled/forfeited&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_981_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_zDeqjNnbT3si" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Number of Shares, Cancelled/forfeited"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1515"&gt;&#x2014;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_980_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_zpLKFWhk7Rx9" style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Weighted Average Price per Share, Cancelled/forfeited"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1517"&gt;&#x2014;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Issued
    and unvested at January 31, 2022&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_980_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_iE_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_z6uC7agcOCD" style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Number of Shares, Issued and Unvested, Ending"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;777,764&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_982_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_iE_pid_c20210501__20220131__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_z3ZlSS1WJbF2" style="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right" title="Weighted Average Price per Share, Issued and Unvested, Ending"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;1.42&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

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    <us-gaap:FairValueDisclosuresTextBlock contextRef="From2021-05-01to2022-01-31">&lt;p id="xdx_806_eus-gaap--FairValueDisclosuresTextBlock_zk6lv0GKpfqd" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;(14)
&lt;span id="xdx_827_zXSgzeGfvhS4"&gt;Fair Value Measurements&lt;/span&gt;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;&#160;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;ASC
Topic 820, &#x201c;&lt;i&gt;Fair Value Measurements&#x201d;&lt;/i&gt; states that fair value is an exit price, representing the amount that would be
received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date.
Assets and liabilities that are measured at fair value are reported using a three-level fair value hierarchy that prioritizes the inputs
used to measure fair value. This hierarchy maximizes the use of observable input and minimizes the use of unobservable inputs. The following
is a description of the three hierarchy levels.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse"&gt;
&lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top"&gt;
  &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: justify; width: 0.65in"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Level
  1&lt;/span&gt;&lt;/td&gt;
  &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Unadjusted
  quoted prices in active markets for identical assets or liabilities that the Company has the ability to access at the measurement date.&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;

&lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top"&gt;
  &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
  &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top"&gt;
  &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Level
  2&lt;/span&gt;&lt;/td&gt;
  &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Inputs
  other than quoted prices in active markets that are observable for the asset or liability, either directly or indirectly.&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;

&lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top"&gt;
  &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
  &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top"&gt;
  &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Level
  3&lt;/span&gt;&lt;/td&gt;
  &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Inputs
  that are unobservable for the asset or liability.&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;


&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 45pt; text-align: justify; text-indent: -45pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;i&gt;Disclosure
of Fair Values&lt;/i&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;The
Company&#x2019;s financial instruments that are not re-measured at fair value include cash, cash equivalents, restricted cash, accounts
receivable, contract assets and liabilities, deposits, accounts payable, and accrued expenses. The carrying values of these financial
instruments approximate their fair values and are viewed as Level 1 items. The Company&#x2019;s warrant liabilities represent the only
asset or liability classified financial instrument that is measured at fair value on a recurring basis.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;The
fair value of the Company&#x2019;s warrant liabilities (refer to Note 8) is based on the Black-Scholes pricing model which is based on
Level 3 unobservable inputs for which there is little or no market data, requiring the Company to develop its own assumptions. The assumptions
used by the Company are the quoted price of the Company&#x2019;s common stock in an active market, risk-free interest rate, volatility
and expected life, and assumes no dividends. Volatility is based on the actual market activity of the Company&#x2019;s stock. The expected
life is based on the remaining contractual term of the warrants and the risk-free interest rate is based on the implied yield available
on U.S. Treasury Securities with a maturity equivalent to the warrants&#x2019; expected life. The fair value on a recurring basis as of
January 31, 2022 and April 30, 2021 was near &lt;span id="xdx_90F_eus-gaap--FairValueNetAssetLiability_iI_dc_c20220131_zPSAHAmKwz5e" title="Fair value on a recurring basis"&gt;&lt;span id="xdx_90D_eus-gaap--FairValueNetAssetLiability_iI_dc_c20210430_zA9MSc24JGje"&gt;zero&lt;/span&gt;&lt;/span&gt;.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"/&gt;



&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;There
were no unrealized gains or losses for the three and nine months ended January 31, 2022 or 2021. When incurred, gains and losses are
included within &#x201c;Gain (loss) due to change in fair value of warrant liabilities&#x201d; in the Consolidated Statements of Operations.
The Company determined the fair value using the Black-Scholes pricing model with the following assumptions:&lt;/span&gt;&lt;/p&gt;

&lt;p id="xdx_89F_ecustom--ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionTableTextBlock_zNrIMIELlQZd" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;span id="xdx_8BE_zDeU3UdWaWYd" style="display: none"&gt;Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%"&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;January
    31, 2022&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;January
    31, 2021&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 64%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Dividend
    rate&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;N/A&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_987_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_pid_dp_c20200501__20210131_zWyPY86aGpqh" style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right" title="Dividend rate"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;0.0&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;%&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Risk-free
    rate&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;N/A
                                            - N/A&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span id="xdx_90B_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_pid_dp_c20200501__20210131__srt--RangeAxis__srt--MinimumMember_z9JKL4coD543" title="Risk-free interest rate"&gt;0.07&lt;/span&gt;%
                                            - &lt;span id="xdx_900_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_pid_dp_c20200501__20210131__srt--RangeAxis__srt--MaximumMember_zHWeCICoZjw8" title="Risk-free interest rate"&gt;0.08&lt;/span&gt;%&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Expected
    life (years)&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;N/A&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span id="xdx_90B_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_dtY_c20200501__20210131__srt--RangeAxis__srt--MinimumMember_znLxIiTvp2d1" title="Expected life (in years)"&gt;0.5&lt;/span&gt;
                                            - &lt;span id="xdx_90D_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_dtY_c20200501__20210131__srt--RangeAxis__srt--MaximumMember_zgypZz5666vi" title="Expected life (in years)"&gt;0.8&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Expected
    volatility&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;N/A&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span id="xdx_902_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_pid_dp_uPure_c20200501__20210131_zjzG36IBtaL9" title="Expected volatility"&gt;146.1&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;%&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

&lt;p id="xdx_8AD_zV3eA4hLrsHa" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Transfers
into or out of any hierarchy level are recognized at the end of the reporting period in which the transfers occurred. There were no transfers
between any hierarchy levels during each of the three and nine months ended January 31, 2022 or 2021.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

</us-gaap:FairValueDisclosuresTextBlock>
    <us-gaap:FairValueNetAssetLiability contextRef="AsOf2022-01-31" decimals="0" unitRef="USD">0</us-gaap:FairValueNetAssetLiability>
    <us-gaap:FairValueNetAssetLiability contextRef="AsOf2021-04-30" decimals="0" unitRef="USD">0</us-gaap:FairValueNetAssetLiability>
    <OPTT:ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionTableTextBlock contextRef="From2021-05-01to2022-01-31">&lt;p id="xdx_89F_ecustom--ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionTableTextBlock_zNrIMIELlQZd" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;span id="xdx_8BE_zDeU3UdWaWYd" style="display: none"&gt;Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%"&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;January
    31, 2022&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;January
    31, 2021&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 64%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Dividend
    rate&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;N/A&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_987_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_pid_dp_c20200501__20210131_zWyPY86aGpqh" style="font: 10pt Times New Roman, Times, Serif; width: 14%; text-align: right" title="Dividend rate"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;0.0&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;%&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Risk-free
    rate&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;N/A
                                            - N/A&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span id="xdx_90B_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_pid_dp_c20200501__20210131__srt--RangeAxis__srt--MinimumMember_z9JKL4coD543" title="Risk-free interest rate"&gt;0.07&lt;/span&gt;%
                                            - &lt;span id="xdx_900_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_pid_dp_c20200501__20210131__srt--RangeAxis__srt--MaximumMember_zHWeCICoZjw8" title="Risk-free interest rate"&gt;0.08&lt;/span&gt;%&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Expected
    life (years)&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;N/A&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span id="xdx_90B_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_dtY_c20200501__20210131__srt--RangeAxis__srt--MinimumMember_znLxIiTvp2d1" title="Expected life (in years)"&gt;0.5&lt;/span&gt;
                                            - &lt;span id="xdx_90D_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_dtY_c20200501__20210131__srt--RangeAxis__srt--MaximumMember_zgypZz5666vi" title="Expected life (in years)"&gt;0.8&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Expected
    volatility&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;N/A&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span id="xdx_902_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_pid_dp_uPure_c20200501__20210131_zjzG36IBtaL9" title="Expected volatility"&gt;146.1&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;%&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

</OPTT:ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionTableTextBlock>
    <us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
      contextRef="From2020-05-012021-01-31"
      decimals="INF"
      unitRef="Pure">0.000</us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate>
    <us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
      contextRef="From2020-05-012021-01-31_srt_MinimumMember"
      decimals="INF"
      unitRef="Pure">0.0007</us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate>
    <us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
      contextRef="From2020-05-012021-01-31_srt_MaximumMember"
      decimals="INF"
      unitRef="Pure">0.0008</us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate>
    <us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1 contextRef="From2020-05-012021-01-31_srt_MinimumMember">P0Y6M</us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1>
    <us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1 contextRef="From2020-05-012021-01-31_srt_MaximumMember">P0Y9M18D</us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1>
    <us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
      contextRef="From2020-05-012021-01-31"
      decimals="INF"
      unitRef="Pure">1.461</us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate>
    <us-gaap:CommitmentsAndContingenciesDisclosureTextBlock contextRef="From2021-05-01to2022-01-31">&lt;p id="xdx_80A_eus-gaap--CommitmentsAndContingenciesDisclosureTextBlock_zkDBzammzTh5" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;(15)
&lt;span id="xdx_826_zvaYjfUo89kb"&gt;Commitments and Contingencies&lt;/span&gt;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;&#160;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;i&gt;Employment
Litigation &lt;/i&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;i&gt;&#160;&lt;/i&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;On
August 28, 2018, counsel for Charles Dunleavy, the Company&#x2019;s former President &amp;amp; Chief Executive Officer who was terminated
for cause effective June 9, 2014, filed a demand for arbitration, captioned Charles F. Dunleavy v. Ocean Power Technologies, Inc., Case
No. 01-18-0003-2374, before the American Arbitration Association in New Jersey. The demand alleged various claims relating to Mr. Dunleavy&#x2019;s
termination. After the hearings in the proceeding were conducted, on December 11, 2020, the arbitration panel issued an interim award
finding, among other things, that the termination for cause of Mr. Dunleavy was in breach of his employment contract and awarded him
compensatory damages in the amount of $&lt;span id="xdx_90F_eus-gaap--LossContingencyDamagesSoughtValue_pp2p0_c20180827__20180828__us-gaap--RelatedPartyTransactionsByRelatedPartyAxis__custom--CharlesFDunleavyMember_zj01hPvLMX59" title="Loss contingency, damages sought, value"&gt;438,254.54&lt;/span&gt;. On May 3, 2021, the panel issued a second interim award and therein awarded Mr. Dunleavy
attorneys&#x2019; fees, costs and pre-judgment interest. The Company agreed, on May 24, 2021, to pay Mr. Dunleavy $&lt;span id="xdx_90D_eus-gaap--LossContingencyDamagesSoughtValue_pp2p0_c20210523__20210524__us-gaap--RelatedPartyTransactionsByRelatedPartyAxis__custom--CharlesFDunleavyMember_zvXV4dNfGOtk" title="Loss contingency, damages sought, value"&gt;1,223,963.14&lt;/span&gt;, representing
the total compensatory damages, attorneys&#x2019; fees, costs and pre-judgment interest, which is the full amount awarded by the arbitration
panel. The Company made the required payment on May 26, 2021, and the matter is now closed.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;i&gt;Spain
Income Tax Audit&lt;/i&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;i&gt;&#160;&lt;/i&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;The
Company underwent an income tax audit in Spain for the period from 2011 to 2014, when our Spanish branch was closed. On July 30, 2018,
the Spanish tax inspector concluded that although there was no tax owed in light of losses reported, the Company&#x2019;s Spanish branch
owed penalties for failure to properly account for the income associated with the funding grant. During the nine months ended January
31, 2021, the Company received notice from the Spanish Central Economic and Administrative Tribunal that it agreed with the inspector
and ruled that the Company owes the full amount of the penalty in the amount of &#x20ac;&lt;span id="xdx_901_eus-gaap--IncomeTaxExaminationPenaltiesAndInterestAccrued_iI_pp0p0_uEuro_c20210131__us-gaap--IncomeStatementLocationAxis__us-gaap--SellingGeneralAndAdministrativeExpensesMember__us-gaap--IncomeTaxAuthorityNameAxis__us-gaap--TaxAuthoritySpainMember_zCI5gOd7amHc" title="Income tax penalties"&gt;279,870&lt;/span&gt; or approximately $&lt;span id="xdx_908_eus-gaap--IncomeTaxExaminationPenaltiesAndInterestAccrued_iI_pp0p0_c20210131__us-gaap--IncomeStatementLocationAxis__us-gaap--SellingGeneralAndAdministrativeExpensesMember__us-gaap--IncomeTaxAuthorityNameAxis__us-gaap--TaxAuthoritySpainMember_zmf1ZljMw74f" title="Income tax penalties"&gt;331,000&lt;/span&gt;. On January 25,
2021, the Company paid the Spanish Tax Administration &#x20ac;&lt;span id="xdx_906_eus-gaap--IncomeTaxExaminationPenaltiesAndInterestAccrued_iI_pp0p0_uEuro_c20210125__us-gaap--IncomeStatementLocationAxis__us-gaap--SellingGeneralAndAdministrativeExpensesMember__us-gaap--IncomeTaxAuthorityNameAxis__us-gaap--TaxAuthoritySpainMember_zq8RRGcAdLsj" title="Income tax penalties"&gt;279,870&lt;/span&gt;. Notwithstanding that payment, on April 30, 2021, the Company filed
its appeal of the decision of the Central Court to the Spanish National Court. There is no schedule for a ruling from the Spanish National
Court.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

</us-gaap:CommitmentsAndContingenciesDisclosureTextBlock>
    <us-gaap:LossContingencyDamagesSoughtValue
      contextRef="From2018-08-272018-08-28_custom_CharlesFDunleavyMember"
      decimals="2"
      unitRef="USD">438254.54</us-gaap:LossContingencyDamagesSoughtValue>
    <us-gaap:LossContingencyDamagesSoughtValue
      contextRef="From2021-05-232021-05-24_custom_CharlesFDunleavyMember"
      decimals="2"
      unitRef="USD">1223963.14</us-gaap:LossContingencyDamagesSoughtValue>
    <us-gaap:IncomeTaxExaminationPenaltiesAndInterestAccrued
      contextRef="AsOf2021-01-31_us-gaap_SellingGeneralAndAdministrativeExpensesMember_us-gaap_TaxAuthoritySpainMember"
      decimals="0"
      unitRef="Euro">279870</us-gaap:IncomeTaxExaminationPenaltiesAndInterestAccrued>
    <us-gaap:IncomeTaxExaminationPenaltiesAndInterestAccrued
      contextRef="AsOf2021-01-31_us-gaap_SellingGeneralAndAdministrativeExpensesMember_us-gaap_TaxAuthoritySpainMember"
      decimals="0"
      unitRef="USD">331000</us-gaap:IncomeTaxExaminationPenaltiesAndInterestAccrued>
    <us-gaap:IncomeTaxExaminationPenaltiesAndInterestAccrued
      contextRef="AsOf2021-01-25_us-gaap_SellingGeneralAndAdministrativeExpensesMember_us-gaap_TaxAuthoritySpainMember"
      decimals="0"
      unitRef="Euro">279870</us-gaap:IncomeTaxExaminationPenaltiesAndInterestAccrued>
    <us-gaap:IncomeTaxDisclosureTextBlock contextRef="From2021-05-01to2022-01-31">&lt;p id="xdx_80E_eus-gaap--IncomeTaxDisclosureTextBlock_zelmQyUhowv1" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;(16)
&lt;span id="xdx_82C_z1TOwrFCjXG2"&gt;Income Taxes&lt;/span&gt;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;&#160;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;i&gt;Uncertain
Tax Positions&lt;/i&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;The
Company applies the guidance issued by the FASB for the accounting and reporting of uncertain tax positions. The guidance requires the
Company to recognize in its consolidated financial statements the impact of a tax position if that position is more likely than not to
be sustained upon examination, based on the technical merits of the position. At January 31, 2022, the Company had no unrecognized tax
positions. The Company does not expect any material increase or decrease in its income tax expense in the next twelve months, related
to examinations or uncertain tax positions. U.S. federal and state income tax returns were audited through fiscal 2014 and fiscal 2010
respectively. Net operating loss and credit carry forwards since inception remain open to examination by taxing authorities and will
continue to remain open for a period of time after utilization.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"/&gt;



&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;i&gt;Income
Tax Benefit&lt;/i&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;The
Company sold New Jersey State net operating losses and research development credits under the NJEDA Tax Transfer program in the amount
of approximately $&lt;span id="xdx_902_eus-gaap--OperatingIncomeLoss_pn5n6_c20200501__20210430_z0sBB1UGo5Kc"&gt;12.0
&lt;/span&gt;&lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;million for the year ended April 30, 2021, for
net proceeds of approximately $&lt;span id="xdx_907_eus-gaap--ProceedsFromDebtNetOfIssuanceCosts_pn5n6_c20200501__20210430_zqmomDTqenQf"&gt;1.0
&lt;/span&gt;&lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;million which was received in May 2021 and recorded
in the Company&#x2019;s Statement of Operations in fiscal year 2022. &lt;span style="background-color: white"&gt;This results from a program
where New Jersey-based technology or biotechnology companies with fewer than 225 US employees may be eligible to sell net operating losses
and research and development tax credits to unaffiliated corporations, up to a maximum lifetime benefit of $&lt;span id="xdx_906_eus-gaap--OperatingIncomeLoss_pn5n6_c20200501__20210430__srt--TitleOfIndividualAxis__custom--USEmployeesMember_zYZltBHHCqbi"&gt;20.0
&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt; background-color: white"&gt;million
per business. As of January 31, 2022 we have approximately $&lt;span id="xdx_90D_eus-gaap--OperatingIncomeLoss_pn5n6_c20210501__20220430_z5gPxIj8U6Yb"&gt;5.0
&lt;/span&gt;&lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt; background-color: white"&gt;million still
available to sell should we chose to do so.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

</us-gaap:IncomeTaxDisclosureTextBlock>
    <us-gaap:OperatingIncomeLoss
      contextRef="From2020-05-012021-04-30"
      decimals="-5"
      unitRef="USD">12000000.0</us-gaap:OperatingIncomeLoss>
    <us-gaap:ProceedsFromDebtNetOfIssuanceCosts
      contextRef="From2020-05-012021-04-30"
      decimals="-5"
      unitRef="USD">1000000.0</us-gaap:ProceedsFromDebtNetOfIssuanceCosts>
    <us-gaap:OperatingIncomeLoss
      contextRef="From2020-05-012021-04-30_custom_USEmployeesMember"
      decimals="-5"
      unitRef="USD">20000000.0</us-gaap:OperatingIncomeLoss>
    <us-gaap:OperatingIncomeLoss
      contextRef="From2021-05-012022-04-30"
      decimals="-5"
      unitRef="USD">5000000.0</us-gaap:OperatingIncomeLoss>
    <us-gaap:SegmentReportingDisclosureTextBlock contextRef="From2021-05-01to2022-01-31">&lt;p id="xdx_804_eus-gaap--SegmentReportingDisclosureTextBlock_zwaJGiyqFWOd" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;(17)
&lt;span id="xdx_822_zKmQ4i11p7Lj"&gt;Operating Segments and Geographic Information&lt;/span&gt;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;&#160;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;The
Company&#x2019;s business consists of &lt;span id="xdx_905_eus-gaap--NumberOfOperatingSegments_pid_dc_uSegment_c20210501__20220131_zEONvlLmNe46"&gt;one
&lt;/span&gt;&lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;segment as this represents how our Chief Operating
Decision Maker views the Company&#x2019;s operations and financial position. The Company operates on a worldwide basis with two
wholly-owned subsidiaries, 3Dent and MAR, and subsidiaries in the UK and in Australia. Revenues and expenses are generally attributed
to the operating company that bills the customers. During each of the nine months ended January 31, 2022 and 2021, the Company&#x2019;s
primary business operations were in North America.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

</us-gaap:SegmentReportingDisclosureTextBlock>
    <us-gaap:NumberOfOperatingSegments
      contextRef="From2021-05-01to2022-01-31"
      decimals="INF"
      unitRef="Segment">1</us-gaap:NumberOfOperatingSegments>
    <us-gaap:BusinessCombinationDisclosureTextBlock contextRef="From2021-05-01to2022-01-31">&lt;p id="xdx_80F_eus-gaap--BusinessCombinationDisclosureTextBlock_zJoPAycELxV3" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;(18)
&lt;span id="xdx_82B_zDJXGqRmabqe"&gt;Business Combination&lt;/span&gt;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;&#160;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;i&gt;3dent
Technologies, LLC&lt;/i&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;i&gt;&#160;&lt;/i&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;On
February 1, 2021, the Company acquired all of the outstanding equity interest of 3dent Technologies, LLC (&#x201c;3Dent&#x201d;), a Houston,
Texas based company that offers offshore energy engineering and design services that are complementary to the Company&#x2019;s technology
and products. As consideration for the purchase, the Company issued &lt;span id="xdx_905_eus-gaap--StockIssuedDuringPeriodSharesAcquisitions_pid_c20210130__20210201__us-gaap--BusinessAcquisitionAxis__custom--ThreeDentAcquisitionMember_zstBYe769FC8"&gt;361,991
&lt;/span&gt;&lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;shares of its common stock to the sellers, subject
to a 12-month post acquisition employment condition, which has now been achieved. In addition, the former owners of 3Dent would have
been eligible for awards of performance stock with a potential value of $&lt;span id="xdx_909_eus-gaap--StockIssuedDuringPeriodValueAcquisitions_pp0p0_c20210130__20210201__us-gaap--BusinessAcquisitionAxis__custom--ThreeDentAcquisitionMember_z87blyFe1db4"&gt;360,000
&lt;/span&gt;&lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;if certain revenue targets are achieved over
the 12 month-period post acquisition. As of January 31, 2022, it was determined that 3Dent did not meet these
revenue targets.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"/&gt;&lt;/p&gt;
&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"/&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"/&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"/&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;i&gt;Marine
Advance Robotics, Inc.&lt;/i&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;i&gt;&#160;&lt;/i&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;On
November 15, 2021, the Company acquired all of the outstanding equity interest of Marine Advanced Robotics, Inc. (&#x201c;MAR&#x201d;),
a Richmond (San Francisco Bay Area), California-based developer and manufacturer of autonomous surface vehicles.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"/&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;The
Company accounted for the transaction as a business combination under ASC 805, &lt;i&gt;&#x201c;Business Combinations.&#x201d; &lt;/i&gt;Accordingly,
the assets and liabilities acquired were recorded at their estimated fair value on the date of acquisition. Under ASC 805, acquisition-related
transaction costs of approximately $&lt;span id="xdx_908_eus-gaap--BusinessCombinationAcquisitionRelatedCosts_pn5n6_c20210501__20220131_zit1szN38eHc" title="Acquisition related costs"&gt;0.3&lt;/span&gt; million (such as advisory, legal, valuation, other professional fees) were expensed in the Consolidated
Statement of Operations in the period incurred.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;The
Company paid cash consideration of $&lt;span id="xdx_902_eus-gaap--PaymentsToAcquireBusinessesGross_pn5n6_c20211114__20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvancedRoboticsIncMember_zRwrT74QqaMc"&gt;4.0 &lt;/span&gt;&lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;million
and issued &lt;span id="xdx_906_eus-gaap--BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_pid_c20211114__20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvancedRoboticsIncMember__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_zfAhFnUNp6vi"&gt;3,330,162 &lt;/span&gt;&lt;/span&gt; &lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;shares
of our&lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt; common stock valued at &lt;span id="xdx_901_eus-gaap--BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned_iI_pn5n6_c20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvancedRoboticsIncMember__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_zIvtrzQPzLr7"&gt;approximately
$5.9&lt;/span&gt;&lt;/span&gt; &lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;million based on the closing
price of $&lt;span id="xdx_90F_eus-gaap--BusinessAcquisitionSharePrice_iI_pid_c20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvancedRoboticsIncMember__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_zvGEfnDzCOqg"&gt;2.10
and &lt;/span&gt;&lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;reduced by a lack of
marketability discount since they were restricted. The Company assumed liability for advances payable to the former owners
of MAR for approximately $456,000.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;The
contingent consideration is based on the achievement of certain milestones over a 30-month period. As of the acquisition date, the
contingent consideration had a fair value of $&lt;span id="xdx_908_eus-gaap--BusinessCombinationContingentConsiderationAsset_iI_pn5n6_c20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvancedRoboticsIncMember_zKAEXOrVQcTb"&gt;1.6 &lt;/span&gt;&lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;million.
Under the terms of the MAR purchase agreement, &lt;span id="xdx_905_eus-gaap--BusinessAcquisitionProFormaInformationDescription_c20211114__20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvancedRoboticsIncMember_z65nc7cCn45l" title="Business combination, description"&gt;the
contingent consideration consists of two earn-out periods, one running from the date of the acquisition through April 30, 2023 in
which the maximum earn-out is $1.5 million and the other from May 1, 2023 through April 30, 2024 where the maximum earn-out is $2
million. The fair value as of the date of acquisition was determined using a simulation model based on an estimate of revenues
during these periods and discount factors ranging from 5.8% to 14.5%.&lt;/span&gt; As discussed in Note 14 per ASC Topic 820 we consider
this to be a Level 3 liability.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;
&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Total
consid&lt;/span&gt;eration including cash, restricted shares, liabilities assumed, and contingent consideration was valued at
approximately $&lt;span id="xdx_902_eus-gaap--BusinessCombinationConsiderationTransferred1_pn5n6_c20211114__20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvancedRoboticsIncMember_zGyyHjpqPvT9"&gt;11.9 &lt;/span&gt;million.&lt;/p&gt;
&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"/&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"/&gt;



&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"/&gt;&lt;/p&gt;

&lt;p id="xdx_892_eus-gaap--ScheduleOfBusinessAcquisitionsByAcquisitionContingentConsiderationTextBlock_zk0exgbolm37" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Purchase
consideration consisted of the following:&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;span id="xdx_8B7_zL6lB3OeLppl" style="display: none"&gt;Schedule
of Purchase Consideration&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 80%"&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td style="padding-bottom: 1pt"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1pt"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1pt solid; text-align: center"&gt;(in thousands)&lt;/td&gt;&lt;td style="padding-bottom: 1pt"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="width: 78%"&gt;Cash&lt;/td&gt;&lt;td style="width: 2%"&gt;&#160;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;$&lt;/td&gt;&lt;td id="xdx_987_eus-gaap--PaymentsToAcquireBusinessesGross_pn3n3_c20211114__20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvancedRoboticsIncMember_zAC7R75eClFk" style="width: 18%; text-align: right" title="Cash"&gt;4,000&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left"&gt;Liabilities assumed&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;td id="xdx_98A_eus-gaap--BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_c20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvancedRoboticsIncMember_pn3n3" style="text-align: right" title="Liabilities assumed"&gt;456&lt;/td&gt;&lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td&gt;Fair value of restricted shares&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;td id="xdx_986_eus-gaap--BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_pn3n3_c20211114__20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvancedRoboticsIncMember_z2X9CcrrX7qg" style="text-align: right" title="Fair value of restricted shares"&gt;5,855&lt;/td&gt;&lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="padding-bottom: 1pt"&gt;Fair value of contingent consideration&lt;/td&gt;&lt;td style="padding-bottom: 1pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td id="xdx_98C_eus-gaap--BusinessCombinationContingentConsiderationAsset_c20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvancedRoboticsIncMember_pn3n3" style="border-bottom: Black 1pt solid; text-align: right" title="Fair value of contingent consideration"&gt;1,591&lt;/td&gt;&lt;td style="padding-bottom: 1pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;Total consideration&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;$&lt;/td&gt;&lt;td id="xdx_98A_eus-gaap--BusinessCombinationConsiderationTransferred1_pn3n3_c20211114__20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvancedRoboticsIncMember_zjM5zKnEr232" style="border-bottom: Black 2.5pt double; text-align: right" title="Total consideration"&gt;11,902&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

&lt;p id="xdx_8A9_z5NIg0ZrRH1d" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"/&gt;

&lt;p id="xdx_89F_eus-gaap--ScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedTableTextBlock_zA8Uzs4chd34" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;The
preliminary allocation of the fair value of the MAR acquisition is shown in the table below. The allocation of the fair value will be
finalized when the valuation is completed, and the differences will be trued up for the final allocated amounts, hence, actual results may differ from preliminary estimate.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span id="xdx_8BF_zbQMjUdwsWa7" style="display: none"&gt;Schedule
of Allocated Fair Value of Purchase Consideration&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 80%"&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="padding-bottom: 1pt; width: 78%; text-align: left"&gt;Total Purchase Consideration&lt;/td&gt;&lt;td style="padding-bottom: 1pt; width: 2%"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; width: 1%; text-align: left"&gt;$&lt;/td&gt;&lt;td id="xdx_98D_eus-gaap--BusinessCombinationConsiderationTransferred1_pn3n3_c20211114__20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvancedRoboticsIncMember_zX5kdPw2dvmj" style="border-bottom: Black 1pt solid; width: 18%; text-align: right" title="Total Purchase Consideration"&gt;11,902&lt;/td&gt;&lt;td style="padding-bottom: 1pt; width: 1%; text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="text-align: right"&gt;&#160;&lt;/td&gt;&lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td&gt;Cash&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;$&lt;/td&gt;&lt;td id="xdx_981_eus-gaap--BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_iI_pn3n3_c20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvanceRoboticsIncMember_zNyZ5jprcmU5" style="text-align: right" title="Cash"&gt;12&lt;/td&gt;&lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td&gt;Inventory&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;td id="xdx_98A_eus-gaap--BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory_iI_pn3n3_c20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvanceRoboticsIncMember_zG2baDro8uX7" style="text-align: right" title="Inventories"&gt;150&lt;/td&gt;&lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left"&gt;Property and equipment, net&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;td id="xdx_983_eus-gaap--BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_iI_pn3n3_c20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvanceRoboticsIncMember_z9dooLl4Jy0l" style="text-align: right" title="Property and equipment, net"&gt;38&lt;/td&gt;&lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td&gt;Trademarks&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;td id="xdx_98D_eus-gaap--BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_iI_pn3n3_c20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvanceRoboticsIncMember__us-gaap--IndefiniteLivedIntangibleAssetsByMajorClassAxis__us-gaap--TradeNamesMember_z6L0E06lAlKe" style="text-align: right" title="Intangible assets"&gt;2,755&lt;/td&gt;&lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td&gt;Patents&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;td id="xdx_988_eus-gaap--BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_iI_pn3n3_c20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvanceRoboticsIncMember__us-gaap--FiniteLivedIntangibleAssetsByMajorClassAxis__us-gaap--PatentsMember_zlRkOjeJ1Hye" style="text-align: right" title="Intangible assets"&gt;1,193&lt;/td&gt;&lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="padding-bottom: 1pt"&gt;Goodwill&lt;/td&gt;&lt;td style="padding-bottom: 1pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td id="xdx_985_eus-gaap--Goodwill_iI_pn3n3_c20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvanceRoboticsIncMember_zuYmZv3w8ON5" style="border-bottom: Black 1pt solid; text-align: right" title="Goodwill"&gt;7,754&lt;/td&gt;&lt;td style="padding-bottom: 1pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;Net assets acquired&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;$&lt;/td&gt;&lt;td id="xdx_989_eus-gaap--BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_iI_pn3n3_c20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvanceRoboticsIncMember_zxM5Z3nCk0C2" style="border-bottom: Black 2.5pt double; text-align: right" title="Net assets acquired"&gt;11,902&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

&lt;p id="xdx_8A1_zsZjQPc9fb32" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; background-color: white"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;The
net assets were recorded at their estimated fair value. In valuing acquired assets and liabilities, fair value estimates were based
primarily on future expected cash flows, market rate assumptions, and appropriate discount rates. In connection with the acquisition
of MAR, we acquired approximately $&lt;span id="xdx_909_eus-gaap--BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_iI_pn5n6_c20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvancedRoboticsIncMember_z4yYiI9qOch2" title="Business acquistion intangible assets"&gt;3.9&lt;/span&gt;
million of intangible assets including trademarks with an indefinite life and patents that will be amortized over a useful life of
nine years. &lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; background-color: white"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; background-color: white"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Goodwill
is considered an indefinite-lived asset that relates primarily to intangible assets that do not qualify for separate recognition.
The Company is currently evaluating the tax implications on the business combination accounting and compiling the information needed
for a pro forma disclosure related to the acquisition of MAR which is expected in our year end reporting.&lt;/span&gt;&lt;/p&gt;





&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"/&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"/&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"/&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"/&gt;&lt;/p&gt;

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    <us-gaap:StockIssuedDuringPeriodSharesAcquisitions
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      contextRef="From2021-01-302021-02-01_custom_ThreeDentAcquisitionMember"
      decimals="0"
      unitRef="USD">360000</us-gaap:StockIssuedDuringPeriodValueAcquisitions>
    <us-gaap:BusinessCombinationAcquisitionRelatedCosts
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      unitRef="USD">300000</us-gaap:BusinessCombinationAcquisitionRelatedCosts>
    <us-gaap:PaymentsToAcquireBusinessesGross
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      decimals="-5"
      unitRef="USD">4000000.0</us-gaap:PaymentsToAcquireBusinessesGross>
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      decimals="INF"
      unitRef="Shares">3330162</us-gaap:BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued>
    <us-gaap:BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned
      contextRef="AsOf2021-11-15_custom_MarineAdvancedRoboticsIncMember_us-gaap_RestrictedStockMember"
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      unitRef="USD">5900000</us-gaap:BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned>
    <us-gaap:BusinessAcquisitionSharePrice
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      decimals="INF"
      unitRef="USDPShares">2.10</us-gaap:BusinessAcquisitionSharePrice>
    <us-gaap:BusinessCombinationContingentConsiderationAsset
      contextRef="AsOf2021-11-15_custom_MarineAdvancedRoboticsIncMember"
      decimals="-5"
      unitRef="USD">1600000</us-gaap:BusinessCombinationContingentConsiderationAsset>
    <us-gaap:BusinessAcquisitionProFormaInformationDescription contextRef="From2021-11-142021-11-15_custom_MarineAdvancedRoboticsIncMember">the
contingent consideration consists of two earn-out periods, one running from the date of the acquisition through April 30, 2023 in
which the maximum earn-out is $1.5 million and the other from May 1, 2023 through April 30, 2024 where the maximum earn-out is $2
million. The fair value as of the date of acquisition was determined using a simulation model based on an estimate of revenues
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    <us-gaap:BusinessCombinationConsiderationTransferred1
      contextRef="From2021-11-142021-11-15_custom_MarineAdvancedRoboticsIncMember"
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      unitRef="USD">11900000</us-gaap:BusinessCombinationConsiderationTransferred1>
    <us-gaap:ScheduleOfBusinessAcquisitionsByAcquisitionContingentConsiderationTextBlock contextRef="From2021-05-01to2022-01-31">&lt;p id="xdx_892_eus-gaap--ScheduleOfBusinessAcquisitionsByAcquisitionContingentConsiderationTextBlock_zk0exgbolm37" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Purchase
consideration consisted of the following:&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;span id="xdx_8B7_zL6lB3OeLppl" style="display: none"&gt;Schedule
of Purchase Consideration&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 80%"&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td style="padding-bottom: 1pt"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1pt"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1pt solid; text-align: center"&gt;(in thousands)&lt;/td&gt;&lt;td style="padding-bottom: 1pt"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="width: 78%"&gt;Cash&lt;/td&gt;&lt;td style="width: 2%"&gt;&#160;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;$&lt;/td&gt;&lt;td id="xdx_987_eus-gaap--PaymentsToAcquireBusinessesGross_pn3n3_c20211114__20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvancedRoboticsIncMember_zAC7R75eClFk" style="width: 18%; text-align: right" title="Cash"&gt;4,000&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left"&gt;Liabilities assumed&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;td id="xdx_98A_eus-gaap--BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_c20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvancedRoboticsIncMember_pn3n3" style="text-align: right" title="Liabilities assumed"&gt;456&lt;/td&gt;&lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td&gt;Fair value of restricted shares&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;td id="xdx_986_eus-gaap--BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_pn3n3_c20211114__20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvancedRoboticsIncMember_z2X9CcrrX7qg" style="text-align: right" title="Fair value of restricted shares"&gt;5,855&lt;/td&gt;&lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="padding-bottom: 1pt"&gt;Fair value of contingent consideration&lt;/td&gt;&lt;td style="padding-bottom: 1pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td id="xdx_98C_eus-gaap--BusinessCombinationContingentConsiderationAsset_c20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvancedRoboticsIncMember_pn3n3" style="border-bottom: Black 1pt solid; text-align: right" title="Fair value of contingent consideration"&gt;1,591&lt;/td&gt;&lt;td style="padding-bottom: 1pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;Total consideration&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;$&lt;/td&gt;&lt;td id="xdx_98A_eus-gaap--BusinessCombinationConsiderationTransferred1_pn3n3_c20211114__20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvancedRoboticsIncMember_zjM5zKnEr232" style="border-bottom: Black 2.5pt double; text-align: right" title="Total consideration"&gt;11,902&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

</us-gaap:ScheduleOfBusinessAcquisitionsByAcquisitionContingentConsiderationTextBlock>
    <us-gaap:PaymentsToAcquireBusinessesGross
      contextRef="From2021-11-142021-11-15_custom_MarineAdvancedRoboticsIncMember"
      decimals="-3"
      unitRef="USD">4000000</us-gaap:PaymentsToAcquireBusinessesGross>
    <us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
      contextRef="AsOf2021-11-15_custom_MarineAdvancedRoboticsIncMember"
      decimals="-3"
      unitRef="USD">456000</us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities>
    <us-gaap:BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
      contextRef="From2021-11-142021-11-15_custom_MarineAdvancedRoboticsIncMember"
      decimals="-3"
      unitRef="USD">5855000</us-gaap:BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable>
    <us-gaap:BusinessCombinationContingentConsiderationAsset
      contextRef="AsOf2021-11-15_custom_MarineAdvancedRoboticsIncMember"
      decimals="-3"
      unitRef="USD">1591000</us-gaap:BusinessCombinationContingentConsiderationAsset>
    <us-gaap:BusinessCombinationConsiderationTransferred1
      contextRef="From2021-11-142021-11-15_custom_MarineAdvancedRoboticsIncMember"
      decimals="-3"
      unitRef="USD">11902000</us-gaap:BusinessCombinationConsiderationTransferred1>
    <us-gaap:ScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedTableTextBlock contextRef="From2021-05-01to2022-01-31">&lt;p id="xdx_89F_eus-gaap--ScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedTableTextBlock_zA8Uzs4chd34" style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;The
preliminary allocation of the fair value of the MAR acquisition is shown in the table below. The allocation of the fair value will be
finalized when the valuation is completed, and the differences will be trued up for the final allocated amounts, hence, actual results may differ from preliminary estimate.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span id="xdx_8BF_zbQMjUdwsWa7" style="display: none"&gt;Schedule
of Allocated Fair Value of Purchase Consideration&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 80%"&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="padding-bottom: 1pt; width: 78%; text-align: left"&gt;Total Purchase Consideration&lt;/td&gt;&lt;td style="padding-bottom: 1pt; width: 2%"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; width: 1%; text-align: left"&gt;$&lt;/td&gt;&lt;td id="xdx_98D_eus-gaap--BusinessCombinationConsiderationTransferred1_pn3n3_c20211114__20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvancedRoboticsIncMember_zX5kdPw2dvmj" style="border-bottom: Black 1pt solid; width: 18%; text-align: right" title="Total Purchase Consideration"&gt;11,902&lt;/td&gt;&lt;td style="padding-bottom: 1pt; width: 1%; text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="text-align: right"&gt;&#160;&lt;/td&gt;&lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td&gt;Cash&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;$&lt;/td&gt;&lt;td id="xdx_981_eus-gaap--BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_iI_pn3n3_c20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvanceRoboticsIncMember_zNyZ5jprcmU5" style="text-align: right" title="Cash"&gt;12&lt;/td&gt;&lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td&gt;Inventory&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;td id="xdx_98A_eus-gaap--BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory_iI_pn3n3_c20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvanceRoboticsIncMember_zG2baDro8uX7" style="text-align: right" title="Inventories"&gt;150&lt;/td&gt;&lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left"&gt;Property and equipment, net&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;td id="xdx_983_eus-gaap--BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_iI_pn3n3_c20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvanceRoboticsIncMember_z9dooLl4Jy0l" style="text-align: right" title="Property and equipment, net"&gt;38&lt;/td&gt;&lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td&gt;Trademarks&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;td id="xdx_98D_eus-gaap--BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_iI_pn3n3_c20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvanceRoboticsIncMember__us-gaap--IndefiniteLivedIntangibleAssetsByMajorClassAxis__us-gaap--TradeNamesMember_z6L0E06lAlKe" style="text-align: right" title="Intangible assets"&gt;2,755&lt;/td&gt;&lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td&gt;Patents&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;td id="xdx_988_eus-gaap--BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_iI_pn3n3_c20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvanceRoboticsIncMember__us-gaap--FiniteLivedIntangibleAssetsByMajorClassAxis__us-gaap--PatentsMember_zlRkOjeJ1Hye" style="text-align: right" title="Intangible assets"&gt;1,193&lt;/td&gt;&lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="padding-bottom: 1pt"&gt;Goodwill&lt;/td&gt;&lt;td style="padding-bottom: 1pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td id="xdx_985_eus-gaap--Goodwill_iI_pn3n3_c20211115__us-gaap--BusinessAcquisitionAxis__custom--MarineAdvanceRoboticsIncMember_zuYmZv3w8ON5" style="border-bottom: Black 1pt solid; text-align: right" title="Goodwill"&gt;7,754&lt;/td&gt;&lt;td style="padding-bottom: 1pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
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end
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
