<SEC-DOCUMENT>0001493152-22-025628.txt : 20220912
<SEC-HEADER>0001493152-22-025628.hdr.sgml : 20220912
<ACCEPTANCE-DATETIME>20220912160100
ACCESSION NUMBER:		0001493152-22-025628
CONFORMED SUBMISSION TYPE:	10-Q
PUBLIC DOCUMENT COUNT:		73
CONFORMED PERIOD OF REPORT:	20220731
FILED AS OF DATE:		20220912
DATE AS OF CHANGE:		20220912

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:		221238586

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

<!-- Field: Rule-Page --><div style="width: 100%"><div style="border-top: Black 4pt solid; font-size: 1pt; border-bottom: Black 1.5pt solid">&#160;</div></div><!-- Field: /Rule-Page -->

<p style="font: 10pt Times New Roman, Times, Serif; text-align: center; 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 18pt"><b>SECURITIES
AND EXCHANGE CsOMMISSION</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 12pt"><b>Washington,
D.C. 20549</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 18pt"><b>Form
<span id="xdx_90A_edei--DocumentType_c20220501__20220731_zahjs16tR2w9"><ix:nonNumeric contextRef="From2022-05-01to2022-07-31" name="dei:DocumentType">10-Q</ix:nonNumeric></span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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_c20220501__20220731_z32rj6IG4PGf"><ix:nonNumeric contextRef="From2022-05-01to2022-07-31" format="ixt:booleantrue" name="dei:DocumentQuarterlyReport">&#9746;</ix:nonNumeric></span></span></td>
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  </table>
<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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_c20220501__20220731_zDTorj0Rilji"><ix:nonNumeric contextRef="From2022-05-01to2022-07-31" format="ixt:datemonthdayyearen" name="dei:DocumentPeriodEndDate">July 31, 2022</ix:nonNumeric></span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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_90D_edei--DocumentTransitionReport_c20220501__20220731_zr7QiZasHCrc"><ix:nonNumeric contextRef="From2022-05-01to2022-07-31" format="ixt:booleanfalse" name="dei:DocumentTransitionReport">&#9744;</ix:nonNumeric></span></span></td>
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    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; margin-left: 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; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Commission
file number: <span id="xdx_908_edei--EntityFileNumber_c20220501__20220731_z7tiAmSnnsdd"><ix:nonNumeric contextRef="From2022-05-01to2022-07-31" name="dei:EntityFileNumber">001-33417</ix:nonNumeric></span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 18pt"><b><span id="xdx_906_edei--EntityRegistrantName_c20220501__20220731_zMUwBuDnePjg"><ix:nonNumeric contextRef="From2022-05-01to2022-07-31" name="dei:EntityRegistrantName">OCEAN
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<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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="font: 10pt Times New Roman, Times, Serif; width: 49%; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><span id="xdx_907_edei--EntityIncorporationStateCountryCode_c20220501__20220731_zOyVuOtB3VV4"><ix:nonNumeric contextRef="From2022-05-01to2022-07-31" 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%; 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%; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><span id="xdx_902_edei--EntityTaxIdentificationNumber_c20220501__20220731_zaeB56uToq5i"><ix:nonNumeric contextRef="From2022-05-01to2022-07-31" 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"><p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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; 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"><p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Identification
    No.)</i></span></p></td></tr>
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<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><span id="xdx_90B_edei--EntityAddressAddressLine1_c20220501__20220731_zUb8rQBLLXW7"><ix:nonNumeric contextRef="From2022-05-01to2022-07-31" name="dei:EntityAddressAddressLine1">28
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<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><span id="xdx_90B_edei--CityAreaCode_c20220501__20220731_zWaKJ7or8Gg6"><ix:nonNumeric contextRef="From2022-05-01to2022-07-31" name="dei:CityAreaCode">(609)</ix:nonNumeric></span>
<span id="xdx_90C_edei--LocalPhoneNumber_c20220501__20220731_zarlHdDWQSS1"><ix:nonNumeric contextRef="From2022-05-01to2022-07-31" name="dei:LocalPhoneNumber">730-0400</ix:nonNumeric></span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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 1.5pt solid; font: 10pt Times New Roman, Times, Serif; width: 34%; 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; padding-bottom: 1.5pt; width: 2%; text-align: center"><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; width: 24%; 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; padding-bottom: 1.5pt; width: 2%; text-align: center"><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; width: 38%; 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; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_90C_edei--Security12bTitle_c20220501__20220731_zn43rwB0AbTc"><ix:nonNumeric contextRef="From2022-05-01to2022-07-31" name="dei:Security12bTitle">Common
    Stock $0.001 par value</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; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_902_edei--TradingSymbol_c20220501__20220731_zCHXjJJJaTZ8"><ix:nonNumeric contextRef="From2022-05-01to2022-07-31" name="dei:TradingSymbol">OPTT</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; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_906_edei--SecurityExchangeName_c20220501__20220731_zZo6e8mQTz9b"><ix:nonNumeric contextRef="From2022-05-01to2022-07-31" format="ixt-sec:exchnameen" name="dei:SecurityExchangeName">NYSE</ix:nonNumeric></span>
    American</span></td></tr>
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<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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_90E_edei--EntityCurrentReportingStatus_c20220501__20220731_zLyhP7liebb8"><ix:nonNumeric contextRef="From2022-05-01to2022-07-31" name="dei:EntityCurrentReportingStatus">Yes</ix:nonNumeric></span> &#9746; No &#9744;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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; text-align: justify; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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_902_edei--EntityInteractiveDataCurrent_c20220501__20220731_zy2zE0puvZy1"><ix:nonNumeric contextRef="From2022-05-01to2022-07-31" name="dei:EntityInteractiveDataCurrent">Yes</ix:nonNumeric></span> &#9746; No &#9744;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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: 23%"><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: 1%"><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: 21%"><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: 1%"><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_900_edei--EntityFilerCategory_c20220501__20220731_zNO5dcIJKnPl"><ix:nonNumeric contextRef="From2022-05-01to2022-07-31" 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: 1%"><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: 31%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Smaller
    reporting company <span id="xdx_902_edei--EntitySmallBusiness_c20220501__20220731_zTg5VWPcT0yl"><ix:nonNumeric contextRef="From2022-05-01to2022-07-31" format="ixt:booleantrue" name="dei:EntitySmallBusiness">&#9746;</ix:nonNumeric></span></span></td></tr>
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<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Emerging
growth company <span id="xdx_90F_edei--EntityEmergingGrowthCompany_c20220501__20220731_zdjWn9nzHCD6"><ix:nonNumeric contextRef="From2022-05-01to2022-07-31" format="ixt:booleanfalse" name="dei:EntityEmergingGrowthCompany">&#9744;</ix:nonNumeric></span></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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 &#9744;  <span id="xdx_909_edei--EntityShellCompany_c20220501__20220731_z3eMkAbGoEk9"><ix:nonNumeric contextRef="From2022-05-01to2022-07-31" format="ixt:booleanfalse" name="dei:EntityShellCompany">No</ix:nonNumeric></span> &#9746;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">As
of September 12, 2022, the number of outstanding shares of common stock of the registrant was <span id="xdx_906_edei--EntityCommonStockSharesOutstanding_iI_pid_c20220912_zn6GLrrjuWgk" title="Entity Common Stock, Shares Outstanding"><ix:nonFraction name="dei:EntityCommonStockSharesOutstanding" contextRef="AsOf2022-09-12" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">55,922,880</ix:nonFraction></span></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; text-align: center; margin-top: 0pt; margin-bottom: 0pt"><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; text-align: center; margin-top: 0pt; margin-bottom: 0pt"><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; margin-bottom: 0pt"><p style="margin: 0pt">&#160;</p></div>
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<p style="font: 10pt Times New Roman, Times, Serif; text-align: center; 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-top: 0pt; margin-bottom: 0pt; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>OCEAN
POWER TECHNOLOGIES, INC.</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><span id="toc_001"></span>INDEX
TO FORM 10-Q</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">&#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; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: center; font: 10pt Times New Roman, Times, Serif; width: 0.75in"><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; text-align: justify"><a href="#a_001"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>PART I &#8212; FINANCIAL INFORMATION</b></span></a></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: 20pt; text-align: justify"><a href="#a_002"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Item 1. Financial Statements:</span></a></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: 30pt; text-align: justify"><a href="#a_003"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Consolidated Balance Sheets as of July 31, 2022 (unaudited) and April 30, 2022</span></a></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: 30pt; text-align: justify"><a href="#a_004"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Unaudited Consolidated Statements of Operations for the three months ended July 31, 2022 and 2021</span></a></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: 30pt; text-align: justify"><a href="#a_005"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Unaudited Consolidated Statements of Comprehensive Loss for the three months ended July 31, 2022 and 2021</span></a></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center">6<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; padding-left: 30pt; text-align: justify"><a href="#a_006"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Unaudited Consolidated Statement of Shareholders&#8217; Equity for the three months ended July 31, 2022 and 2021</span></a></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: 30pt; text-align: justify"><a href="#a_007"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Unaudited Consolidated Statements of Cash Flows for the three months ended July 31, 2022 and 2021</span></a></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center">8</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: 30pt; text-align: justify"><a href="#a_008"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Notes to Unaudited Consolidated Financial Statements</span></a></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center">9</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: justify"><a href="#a_009"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Item 2. Management&#8217;s Discussion and Analysis of Financial Condition and Results of Operations</span></a></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">23</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; text-align: justify"><a href="#a_010"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Item 3. Quantitative and Qualitative Disclosures About Market Risk</span></a></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">38</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: justify"><a href="#a_011"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Item 4. Controls and Procedures</span></a></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">38</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: justify"><a href="#a_012"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>PART II &#8212; OTHER INFORMATION</b></span></a></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">39</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: justify"><a href="#a_013"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Item 1. Legal Proceedings</span></a></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">39</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; text-align: justify"><a href="#a_014"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Item 1A. Risk Factors</span></a></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center">39</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: justify"><a href="#a_015"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Item 2. Unregistered Sales of Equity Securities and Use of Proceeds</span></a></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">39</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; text-align: justify"><a href="#a_016"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Item 3. Defaults Upon Senior Securities</span></a></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center">39</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: justify"><a href="#a_017"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Item 4. Mine Safety Disclosures</span></a></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center">39</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; text-align: justify"><a href="#a_018"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Item 5. Other Information</span></a></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center">39</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: justify"><a href="#a_019"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Item 6. Exhibits</span></a></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">40</span></td></tr>
  </table>
<p style="font: 10pt Times New Roman, Times, Serif; text-align: center; margin-top: 0pt; margin-bottom: 0pt"><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; text-align: center; margin-top: 0pt; margin-bottom: 0pt"><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; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0.5in; 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-top: 0pt; margin-bottom: 0pt; margin-left: 0.5in; 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-top: 0pt; margin-bottom: 0pt; margin-left: 0.5in; 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 COVID-19 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-top: 0pt; margin-bottom: 0pt; margin-left: 0.5in; 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 meet product development, manufacturing and customer delivery deadlines 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;</span></td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0.5in; 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-top: 0pt; margin-bottom: 0pt; margin-left: 0.5in; 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
                                            estimates regarding future expenses, revenues, and capital requirements;</span></td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0.5in; 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-top: 0pt; margin-bottom: 0pt; margin-left: 0.5in; 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-top: 0pt; margin-bottom: 0pt; margin-left: 0.5in; 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 as markets develop, or at
                                            all;</span></td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0.5in; 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 establish relationships with our existing and future strategic partners may not
                                            be successful;</span></td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0.5in; 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-top: 0pt; margin-bottom: 0pt; margin-left: 0.5in; 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-top: 0pt; margin-bottom: 0pt; margin-left: 0.5in; 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-top: 0pt; margin-bottom: 0pt; margin-left: 0.5in; 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-top: 0pt; margin-bottom: 0pt; margin-left: 0.5in; 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,
                                            or restrict the use of our products;</span></td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0.5in; 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 hire and retain key personnel, including senior management, to achieve our business
                                            objectives;</span></td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0.5in; 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-top: 0pt; margin-bottom: 0pt; margin-left: 0.5in; 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-top: 0pt; margin-bottom: 0pt; margin-left: 0.5in; 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-top: 0pt; margin-bottom: 0pt; margin-left: 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, 2022, 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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-top: 0pt; margin-bottom: 0pt; 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; margin-bottom: 0pt"><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 Content</a></td></tr></table></div>
    <!-- Field: /Page -->

<p style="font: 10pt Times New Roman, Times, Serif; text-align: center; margin-top: 0pt; margin-bottom: 0pt"><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; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><span id="a_001"></span>PART
I &#8212; FINANCIAL INFORMATION</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">&#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: 0.5in"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><span id="a_002"></span>Item 1.</b></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"><b>Financial
                                            Statements</b></span></td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; text-align: center; margin-top: 0pt; margin-bottom: 0pt"><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; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><span id="a_003"></span>Ocean
Power Technologies, Inc. and Subsidiaries</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>Consolidated
Balance Sheets</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>(in
$000&#8217;s, except share data)</b></span></p>

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

<table cellpadding="0" cellspacing="0" id="xdx_301_111_pn3n3_z6872tO3m7G5" summary="xdx: Statement - Consolidated Balance Sheets" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="display: none; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: center">&#160;</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td id="xdx_49D_20220731_zeMwyoHG2Dab" style="text-align: right">&#160;</td><td style="text-align: left">&#160;</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td id="xdx_493_20220430_z81jGurQVcxh" style="text-align: right">&#160;</td><td style="text-align: left">&#160;</td></tr>
<tr style="vertical-align: bottom">
    <td>&#160;</td><td style="font-weight: bold; padding-bottom: 1.5pt">&#160;</td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center">July 31, 2022</td><td style="padding-bottom: 1.5pt; font-weight: bold">&#160;</td><td style="font-weight: bold; padding-bottom: 1.5pt">&#160;</td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center">April 30, 2022</td><td style="padding-bottom: 1.5pt; font-weight: bold">&#160;</td></tr>
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    <td>&#160;</td><td>&#160;</td>
    <td colspan="2" style="text-align: center">(Unaudited)</td><td>&#160;</td><td>&#160;</td>
    <td colspan="2">&#160;</td><td>&#160;</td></tr>
  <tr id="xdx_40B_eus-gaap--AssetsAbstract_iB_zTTmpHZ0Znbj" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: center">ASSETS</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><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>
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    <td style="text-align: left">&#160;</td><td style="text-align: right">&#160;</td><td style="text-align: left">&#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 id="xdx_406_eus-gaap--CashAndCashEquivalentsAtCarryingValue_i02I_maCzV4s_zcoZzi5nNGe6" style="vertical-align: bottom; background-color: rgb(204,238,255)">
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    <td style="padding-left: 10pt; text-align: left">Restricted cash, short-term</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td style="text-align: right"><ix:nonFraction name="us-gaap:RestrictedCashCurrent" contextRef="AsOf2022-07-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">258</ix:nonFraction></td><td style="text-align: left">&#160;</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td style="text-align: right"><ix:nonFraction name="us-gaap:RestrictedCashCurrent" contextRef="AsOf2022-04-30" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">258</ix:nonFraction></td><td style="text-align: left">&#160;</td></tr>
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    <td style="padding-left: 10pt; text-align: left">Accounts receivable</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td style="text-align: right"><ix:nonFraction name="us-gaap:AccountsReceivableNetCurrent" contextRef="AsOf2022-07-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">119</ix:nonFraction></td><td style="text-align: left">&#160;</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td style="text-align: right"><ix:nonFraction name="us-gaap:AccountsReceivableNetCurrent" contextRef="AsOf2022-04-30" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">482</ix:nonFraction></td><td style="text-align: left">&#160;</td></tr>
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  <tr id="xdx_40B_eus-gaap--OtherAssetsCurrent_i02I_maCzV4s_zA1FVuTtM8Y3" style="vertical-align: bottom; background-color: rgb(204,238,255)">
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  <tr id="xdx_402_eus-gaap--AssetsCurrent_i02TI_mtCzV4s_maCz7hR_zVASSBVskLk2" style="vertical-align: bottom; background-color: White">
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  <tr id="xdx_40C_eus-gaap--PropertyPlantAndEquipmentNet_i01I_maCz7hR_z0iU6iG6CPP1" style="vertical-align: bottom; background-color: rgb(204,238,255)">
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  <tr id="xdx_408_eus-gaap--IntangibleAssetsNetExcludingGoodwill_i01I_maCz7hR_zyA599VWVUPh" style="vertical-align: bottom; background-color: White">
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  <tr id="xdx_409_eus-gaap--OperatingLeaseRightOfUseAsset_i01I_maCz7hR_zetKrbU9Ea22" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left">Right-of-use asset, net</td><td>&#160;</td>
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  <tr id="xdx_40C_eus-gaap--RestrictedCashNoncurrent_i01I_maCz7hR_zWx8DYNiERH7" style="vertical-align: bottom; background-color: White">
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  <tr id="xdx_404_eus-gaap--Goodwill_i01I_maCz7hR_z6LsUjcqT7ii" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="padding-bottom: 1.5pt">Goodwill</td><td style="padding-bottom: 1.5pt">&#160;</td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left">$</td><td style="border-bottom: Black 1.5pt solid; text-align: right"><ix:nonFraction name="us-gaap:Goodwill" contextRef="AsOf2022-07-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">8,537</ix:nonFraction></td><td style="padding-bottom: 1.5pt; text-align: left">&#160;</td><td style="padding-bottom: 1.5pt">&#160;</td>
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  <tr id="xdx_406_eus-gaap--Assets_i01TI_mtCz7hR_zxvAZXAKcdG8" style="vertical-align: bottom; background-color: White">
    <td style="padding-left: 20pt; text-align: left; padding-bottom: 2.5pt">Total assets</td><td style="padding-bottom: 2.5pt">&#160;</td>
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  <tr id="xdx_40C_eus-gaap--LiabilitiesAndStockholdersEquityAbstract_iB" style="vertical-align: bottom; background-color: rgb(204,238,255)">
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  <tr id="xdx_40C_eus-gaap--LiabilitiesCurrentAbstract_i01B_z2oJNtsxWiEd" style="vertical-align: bottom; background-color: White">
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    <td style="text-align: left">&#160;</td><td style="text-align: right">&#160;</td><td style="text-align: left">&#160;</td><td>&#160;</td>
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  <tr id="xdx_409_eus-gaap--AccountsPayableCurrent_i02I_maCzFnS_zk8MqyJdPSrl" style="vertical-align: bottom; background-color: rgb(204,238,255)">
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  <tr id="xdx_40C_eus-gaap--AccruedLiabilitiesCurrent_i02I_maCzFnS_z4OSByzFEYXg" style="vertical-align: bottom; background-color: White">
    <td style="padding-left: 10pt; text-align: left">Accrued expenses</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td style="text-align: right"><ix:nonFraction name="us-gaap:AccruedLiabilitiesCurrent" contextRef="AsOf2022-07-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">1,090</ix:nonFraction></td><td style="text-align: left">&#160;</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td style="text-align: right"><ix:nonFraction name="us-gaap:AccruedLiabilitiesCurrent" contextRef="AsOf2022-04-30" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">877</ix:nonFraction></td><td style="text-align: left">&#160;</td></tr>
  <tr id="xdx_401_eus-gaap--ContractWithCustomerLiabilityCurrent_i02I_maCzFnS_z3OULhjI23wf" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="padding-left: 10pt; text-align: left">Contract liabilities</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td style="text-align: right"><ix:nonFraction name="us-gaap:ContractWithCustomerLiabilityCurrent" contextRef="AsOf2022-07-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">101</ix:nonFraction></td><td style="text-align: left">&#160;</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td style="text-align: right"><ix:nonFraction name="us-gaap:ContractWithCustomerLiabilityCurrent" contextRef="AsOf2022-04-30" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">129</ix:nonFraction></td><td style="text-align: left">&#160;</td></tr>
  <tr id="xdx_407_eus-gaap--OperatingLeaseLiabilityCurrent_i02I_maCzFnS_zw5SlPJefO08" style="vertical-align: bottom; background-color: White">
    <td style="padding-left: 10pt; text-align: left">Right-of-use liability, current portion</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td style="text-align: right"><ix:nonFraction name="us-gaap:OperatingLeaseLiabilityCurrent" contextRef="AsOf2022-07-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">328</ix:nonFraction></td><td style="text-align: left">&#160;</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td style="text-align: right"><ix:nonFraction name="us-gaap:OperatingLeaseLiabilityCurrent" contextRef="AsOf2022-04-30" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">319</ix:nonFraction></td><td style="text-align: left">&#160;</td></tr>
  <tr id="xdx_40A_eus-gaap--BusinessCombinationContingentConsiderationLiabilityCurrent_i02I_maCzFnS_zkU4hTWf1kWa" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="padding-left: 10pt; text-align: left; padding-bottom: 1.5pt">Contingent liabilities, current portion</td><td style="padding-bottom: 1.5pt">&#160;</td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left">&#160;</td><td style="border-bottom: Black 1.5pt solid; text-align: right"><ix:nonFraction name="us-gaap:BusinessCombinationContingentConsiderationLiabilityCurrent" contextRef="AsOf2022-07-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">640</ix:nonFraction></td><td style="padding-bottom: 1.5pt; text-align: left">&#160;</td><td style="padding-bottom: 1.5pt">&#160;</td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left">&#160;</td><td style="border-bottom: Black 1.5pt solid; text-align: right"><ix:nonFraction name="us-gaap:BusinessCombinationContingentConsiderationLiabilityCurrent" contextRef="AsOf2022-04-30" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">748</ix:nonFraction></td><td style="padding-bottom: 1.5pt; text-align: left">&#160;</td></tr>
  <tr id="xdx_406_eus-gaap--LiabilitiesCurrent_i02TI_mtCzFnS_maCzK0f_zPcR94SFfLQk" style="vertical-align: bottom; background-color: White">
    <td style="padding-left: 20pt; text-align: left">Total current liabilities</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td style="text-align: right"><ix:nonFraction name="us-gaap:LiabilitiesCurrent" contextRef="AsOf2022-07-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">3,217</ix:nonFraction></td><td style="text-align: left">&#160;</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td style="text-align: right"><ix:nonFraction name="us-gaap:LiabilitiesCurrent" contextRef="AsOf2022-04-30" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">2,978</ix:nonFraction></td><td style="text-align: left">&#160;</td></tr>
  <tr id="xdx_408_eus-gaap--DeferredIncomeTaxLiabilitiesNet_i02I_maCzK0f_zKoSip5TPfI6" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left">Deferred tax liability</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td style="text-align: right"><ix:nonFraction name="us-gaap:DeferredIncomeTaxLiabilitiesNet" contextRef="AsOf2022-07-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">203</ix:nonFraction></td><td style="text-align: left">&#160;</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td style="text-align: right"><ix:nonFraction name="us-gaap:DeferredIncomeTaxLiabilitiesNet" contextRef="AsOf2022-04-30" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">203</ix:nonFraction></td><td style="text-align: left">&#160;</td></tr>
  <tr id="xdx_40D_eus-gaap--BusinessCombinationContingentConsiderationLiabilityNoncurrent_i02I_maCzK0f_zxAfP1I2zhR5" style="vertical-align: bottom; background-color: White">
    <td style="text-align: left">Contingent liabilities, less current portion</td><td>&#160;</td>
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    <td style="text-align: left">&#160;</td><td style="text-align: right"><ix:nonFraction name="us-gaap:BusinessCombinationContingentConsiderationLiabilityNoncurrent" contextRef="AsOf2022-04-30" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">843</ix:nonFraction></td><td style="text-align: left">&#160;</td></tr>
  <tr id="xdx_40B_eus-gaap--OperatingLeaseLiabilityNoncurrent_i01I_maCzK0f_zURyBjzay0Nb" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left; padding-bottom: 1.5pt">Right-of-use liability, less current portion</td><td style="padding-bottom: 1.5pt">&#160;</td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left">&#160;</td><td style="border-bottom: Black 1.5pt solid; text-align: right"><ix:nonFraction name="us-gaap:OperatingLeaseLiabilityNoncurrent" contextRef="AsOf2022-07-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">446</ix:nonFraction></td><td style="padding-bottom: 1.5pt; text-align: left">&#160;</td><td style="padding-bottom: 1.5pt">&#160;</td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left">&#160;</td><td style="border-bottom: Black 1.5pt solid; text-align: right"><ix:nonFraction name="us-gaap:OperatingLeaseLiabilityNoncurrent" contextRef="AsOf2022-04-30" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">538</ix:nonFraction></td><td style="padding-bottom: 1.5pt; text-align: left">&#160;</td></tr>
  <tr id="xdx_40C_eus-gaap--Liabilities_i01TI_mtCzK0f_maCzQd4_zx9uQGRm1XXk" style="vertical-align: bottom; background-color: White">
    <td style="padding-left: 20pt; text-align: left; padding-bottom: 1.5pt">Total liabilities</td><td style="padding-bottom: 1.5pt">&#160;</td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left">&#160;</td><td style="border-bottom: Black 1.5pt solid; text-align: right"><ix:nonFraction name="us-gaap:Liabilities" contextRef="AsOf2022-07-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">4,686</ix:nonFraction></td><td style="padding-bottom: 1.5pt; text-align: left">&#160;</td><td style="padding-bottom: 1.5pt">&#160;</td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left">&#160;</td><td style="border-bottom: Black 1.5pt solid; text-align: right"><ix:nonFraction name="us-gaap:Liabilities" contextRef="AsOf2022-04-30" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">4,562</ix:nonFraction></td><td style="padding-bottom: 1.5pt; text-align: left">&#160;</td></tr>
  <tr id="xdx_405_eus-gaap--CommitmentsAndContingencies_i01I_maCzQd4_zhwZNmpYJQr3" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left">Commitments and contingencies (Note 13)</td><td>&#160;</td>
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    <td style="text-align: left">&#160;</td><td style="text-align: right">&#160;</td><td style="text-align: left">&#160;</td></tr>
  <tr id="xdx_402_eus-gaap--StockholdersEquityAbstract_i01B" style="vertical-align: bottom; background-color: White">
    <td style="text-align: left">Shareholders&#8217; Equity:</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><td>&#160;</td>
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  <tr id="xdx_408_eus-gaap--PreferredStockValue_i02I_maCziOM_z9e0NT15OMI6" style="vertical-align: bottom; background-color: rgb(204,238,255)">
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<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center">&#160;</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">See
accompanying notes to unaudited consolidated financial statements.</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">&#160;</span></p>


<!-- Field: Page; Sequence: 4; Value: 2 -->
    <div style="border-bottom: Black 1.5pt solid; margin-top: 0pt; 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 -->4<!-- Field: /Sequence --></td></tr></table></div>
    <div style="break-before: page; margin-top: 6pt; margin-bottom: 0pt"><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 Content</a></td></tr></table></div>
    <!-- Field: /Page -->

<p style="font: 10pt Times New Roman, Times, Serif; text-align: center; margin-top: 0pt; margin-bottom: 0pt"><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; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><span id="a_004"></span>Ocean
Power Technologies, Inc. and Subsidiaries</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>Consolidated
Statements of Operations</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>(in
$000&#8217;s, except per share data)</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>Unaudited</b></span></p>

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

<table cellpadding="0" cellspacing="0" id="xdx_307_113_pn3n3_zYNF7k6MUpH1" summary="xdx: Statement - Consolidated Statements of Operations (Unaudited)" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
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    <td>&#160;</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td id="xdx_49B_20220501__20220731_z1vMsM9kVFm2" style="text-align: right">&#160;</td><td style="text-align: left">&#160;</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td id="xdx_498_20210501__20210731_zIr5dHgkFsO1" style="text-align: right">&#160;</td><td style="text-align: left">&#160;</td></tr>
<tr style="vertical-align: bottom">
    <td>&#160;</td><td style="font-weight: bold; padding-bottom: 1.5pt">&#160;</td>
    <td colspan="6" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center">Three months ended July 31,</td><td style="padding-bottom: 1.5pt; font-weight: bold">&#160;</td></tr>
  <tr style="vertical-align: bottom">
    <td>&#160;</td><td style="font-weight: bold; padding-bottom: 1.5pt">&#160;</td>
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    <td colspan="2">&#160;</td><td>&#160;</td><td>&#160;</td>
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<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">&#160;</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">See
accompanying notes to unaudited consolidated financial statements.</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">&#160;</span></p>


<!-- Field: Page; Sequence: 5; Value: 2 -->
    <div style="border-bottom: Black 1.5pt solid; margin-top: 0pt; 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 -->5<!-- Field: /Sequence --></td></tr></table></div>
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    <!-- Field: /Page -->

<p style="font: 10pt Times New Roman, Times, Serif; text-align: center; margin-top: 0pt; margin-bottom: 0pt"><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; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><span id="a_005"></span>Ocean
Power Technologies, Inc. and Subsidiaries</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>Consolidated
Statements of Comprehensive Loss</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>(in
$000&#8217;s)</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>Unaudited</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">&#160;</span></p>

<table cellpadding="0" cellspacing="0" id="xdx_30E_113_pn3n3_zjJoUa2Z6bUb" summary="xdx: Statement - Consolidated Statements of Comprehensive Loss (Unaudited)" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
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<tr style="vertical-align: bottom">
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  <tr style="vertical-align: bottom">
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<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">&#160;</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">See
accompanying notes to unaudited consolidated financial statements.</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">&#160;</span></p>


<!-- Field: Page; Sequence: 6; Value: 2 -->
    <div style="border-bottom: Black 1.5pt solid; margin-top: 0pt; 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 -->6<!-- Field: /Sequence --></td></tr></table></div>
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    <!-- Field: /Page -->

<p style="font: 10pt Times New Roman, Times, Serif; text-align: center; margin-top: 0pt; margin-bottom: 0pt"><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; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><span id="a_006"></span>Ocean
Power Technologies, Inc. and Subsidiaries</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>Consolidated
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<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>(in
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<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>Unaudited</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">&#160;</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"></span></p>

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

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  </table>


<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">&#160;</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">See
accompanying notes to unaudited consolidated financial statements.</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">&#160;</span></p>


<!-- Field: Page; Sequence: 7; Value: 2 -->
    <div style="border-bottom: Black 1.5pt solid; margin-top: 0pt; 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 -->7<!-- Field: /Sequence --></td></tr></table></div>
    <div style="break-before: page; margin-top: 6pt; margin-bottom: 0pt"><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 Content</a></td></tr></table></div>
    <!-- Field: /Page -->

<p style="font: 10pt Times New Roman, Times, Serif; text-align: center; margin-top: 0pt; margin-bottom: 0pt"><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; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><span id="a_007"></span>Ocean
Power Technologies, Inc. and Subsidiaries</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>Consolidated
Statements of Cash Flows</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>(in
$000&#8217;s)</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>Unaudited</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">&#160;</span></p>

<table cellpadding="0" cellspacing="0" id="xdx_30C_112_pn3n3_zyZjCj3sugZh" summary="xdx: Statement - Consolidated Statements of Cash Flows (Unaudited)" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="display: none; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left">&#160;</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td id="xdx_49B_20220501__20220731_z31sw134Lsy2" style="text-align: right">&#160;</td><td style="text-align: left">&#160;</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td id="xdx_499_20210501__20210731_z0wa9qX4iU26" style="text-align: right">&#160;</td><td style="text-align: left">&#160;</td></tr>
<tr style="vertical-align: bottom">
    <td>&#160;</td><td style="font-weight: bold; padding-bottom: 1.5pt">&#160;</td>
    <td colspan="6" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center">Three months ended July 31,</td><td style="padding-bottom: 1.5pt; font-weight: bold">&#160;</td></tr>
  <tr style="vertical-align: bottom">
    <td>&#160;</td><td style="font-weight: bold; padding-bottom: 1.5pt">&#160;</td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center">2022</td><td style="padding-bottom: 1.5pt; font-weight: bold">&#160;</td><td style="font-weight: bold; padding-bottom: 1.5pt">&#160;</td>
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    <td>&#160;</td><td>&#160;</td>
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    <td colspan="2">&#160;</td><td>&#160;</td></tr>
  <tr id="xdx_401_eus-gaap--NetCashProvidedByUsedInOperatingActivitiesAbstract_iB_zG9DP4K2lnff" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left">Cash flows from operating activities:</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><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>
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    <td style="padding-left: 10pt; width: 60%; text-align: left">Net loss</td><td style="width: 2%">&#160;</td>
    <td style="width: 1%; text-align: left">$</td><td style="width: 16%; text-align: right">(<ix:nonFraction name="us-gaap:NetIncomeLoss" contextRef="From2022-05-01to2022-07-31" format="ixt:numdotdecimal" decimals="-3" scale="3" sign="-" unitRef="USD">5,852</ix:nonFraction></td><td style="width: 1%; text-align: left">)</td><td style="width: 2%">&#160;</td>
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    <td style="text-align: left">&#160;</td><td style="text-align: right">&#160;</td><td style="text-align: left">&#160;</td></tr>
  <tr id="xdx_40C_eus-gaap--DepreciationDepletionAndAmortization_i02_maCzhzK_zBw2gxJ74kTb" style="vertical-align: bottom; background-color: White">
    <td style="padding-left: 20pt; text-align: left">Depreciation of fixed assets</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td style="text-align: right"><ix:nonFraction name="us-gaap:DepreciationDepletionAndAmortization" contextRef="From2022-05-01to2022-07-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">43</ix:nonFraction></td><td style="text-align: left">&#160;</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td style="text-align: right"><ix:nonFraction name="us-gaap:DepreciationDepletionAndAmortization" contextRef="From2021-05-012021-07-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">40</ix:nonFraction></td><td style="text-align: left">&#160;</td></tr>
  <tr id="xdx_40D_eus-gaap--AmortizationOfIntangibleAssets_i02_maCzhzK_zevcNgNAWu9g" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="padding-left: 20pt; text-align: left">Amortization of intangible assets</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td style="text-align: right"><ix:nonFraction name="us-gaap:AmortizationOfIntangibleAssets" contextRef="From2022-05-01to2022-07-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">40</ix:nonFraction></td><td style="text-align: left">&#160;</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td style="text-align: right"><ix:nonFraction name="us-gaap:AmortizationOfIntangibleAssets" contextRef="From2021-05-012021-07-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">6</ix:nonFraction></td><td style="text-align: left">&#160;</td></tr>
  <tr id="xdx_406_eus-gaap--OperatingLeaseRightOfUseAssetAmortizationExpense_i02_maCzhzK_zrWFDYFlWDa2" style="vertical-align: bottom; background-color: White">
    <td style="padding-left: 20pt; text-align: left">Amortization of right of use asset</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td style="text-align: right"><ix:nonFraction name="us-gaap:OperatingLeaseRightOfUseAssetAmortizationExpense" contextRef="From2022-05-01to2022-07-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">75</ix:nonFraction></td><td style="text-align: left">&#160;</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td style="text-align: right"><ix:nonFraction name="us-gaap:OperatingLeaseRightOfUseAssetAmortizationExpense" contextRef="From2021-05-012021-07-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">69</ix:nonFraction></td><td style="text-align: left">&#160;</td></tr>
  <tr id="xdx_40F_ecustom--AmortizationOfPremiumOnMarketableSecurities_i02_maCzhzK_zVNgKCpjxbNc" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="padding-left: 20pt; text-align: left">Amortization of premium on marketable securities</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td style="text-align: right"><ix:nonFraction name="OPTT:AmortizationOfPremiumOnMarketableSecurities" contextRef="From2022-05-01to2022-07-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">220</ix:nonFraction></td><td style="text-align: left">&#160;</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td style="text-align: right"><span style="-sec-ix-hidden: xdx2ixbrl0341">&#8212;</span></td><td style="text-align: left">&#160;</td></tr>
  <tr id="xdx_40D_eus-gaap--GainsLossesOnExtinguishmentOfDebt_i02N_pn3n3_di_msCzhzK_zayRZzk3eBa7" style="vertical-align: bottom; background-color: White">
    <td style="padding-left: 20pt; text-align: left">Gain on extinguishment of PPP Loan</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td style="text-align: right"><span style="-sec-ix-hidden: xdx2ixbrl0343">&#8212;</span></td><td style="text-align: left">&#160;</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td style="text-align: right">(<ix:nonFraction name="us-gaap:GainsLossesOnExtinguishmentOfDebt" contextRef="From2021-05-012021-07-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">891</ix:nonFraction></td><td style="text-align: left">)</td></tr>
  <tr id="xdx_40E_eus-gaap--ShareBasedCompensation_i02_maCzhzK_zKaTeHF0UdAj" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="padding-left: 20pt; text-align: left">Compensation expense related to equity compensation</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td style="text-align: right"><ix:nonFraction name="us-gaap:ShareBasedCompensation" contextRef="From2022-05-01to2022-07-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">333</ix:nonFraction></td><td style="text-align: left">&#160;</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td style="text-align: right"><ix:nonFraction name="us-gaap:ShareBasedCompensation" contextRef="From2021-05-012021-07-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">390</ix:nonFraction></td><td style="text-align: left">&#160;</td></tr>
  <tr id="xdx_408_ecustom--ChangeInContingentLiabilityConsideration_i02N_pn3n3_di_msCzhzK_z2SlqhKyMJ85" style="vertical-align: bottom; background-color: White">
    <td style="padding-left: 20pt; text-align: left">Change in contingent liability consideration</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td style="text-align: right"><p style="margin: 0">(<ix:nonFraction name="OPTT:ChangeInContingentLiabilityConsideration" contextRef="From2022-05-01to2022-07-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">131</ix:nonFraction></p></td><td style="text-align: left">)</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td style="text-align: right"><p style="margin: 0"><span style="-sec-ix-hidden: xdx2ixbrl0350">&#8212;</span></p></td><td style="text-align: left">&#160;</td></tr>
  <tr id="xdx_40C_eus-gaap--IncreaseDecreaseInOperatingCapitalAbstract_i02B_zSL1QXePxEM" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="padding-left: 20pt; text-align: left">Changes in operating assets and liabilities:</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><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 id="xdx_408_eus-gaap--IncreaseDecreaseInAccountsReceivable_i03N_di_msCzhzK_zdAxWMgaQC1d" style="vertical-align: bottom; background-color: White">
    <td style="padding-left: 30pt; text-align: left">Accounts receivable</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td style="text-align: right"><ix:nonFraction name="us-gaap:IncreaseDecreaseInAccountsReceivable" contextRef="From2022-05-01to2022-07-31" format="ixt:numdotdecimal" decimals="-3" scale="3" sign="-" unitRef="USD">363</ix:nonFraction></td><td style="text-align: left">&#160;</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td style="text-align: right">(<ix:nonFraction name="us-gaap:IncreaseDecreaseInAccountsReceivable" contextRef="From2021-05-012021-07-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">96</ix:nonFraction></td><td style="text-align: left">)</td></tr>
  <tr id="xdx_408_eus-gaap--IncreaseDecreaseInContractWithCustomerAsset_i03N_di_msCzhzK_zd9nMenYVno1" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="padding-left: 30pt; text-align: left">Contract assets</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td style="text-align: right">(<ix:nonFraction name="us-gaap:IncreaseDecreaseInContractWithCustomerAsset" contextRef="From2022-05-01to2022-07-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">280</ix:nonFraction></td><td style="text-align: left">)</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td style="text-align: right">(<ix:nonFraction name="us-gaap:IncreaseDecreaseInContractWithCustomerAsset" contextRef="From2021-05-012021-07-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">114</ix:nonFraction></td><td style="text-align: left">)</td></tr>
  <tr id="xdx_40C_eus-gaap--IncreaseDecreaseInInventories_i03N_di_msCzhzK_zSIFkTQiKtVk" style="vertical-align: bottom; background-color: White">
    <td style="padding-left: 30pt">Inventory</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td style="text-align: right">(<ix:nonFraction name="us-gaap:IncreaseDecreaseInInventories" contextRef="From2022-05-01to2022-07-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">146</ix:nonFraction></td><td style="text-align: left">)</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td style="text-align: right"><span style="-sec-ix-hidden: xdx2ixbrl0362">&#8212;</span></td><td style="text-align: left">&#160;</td></tr>
  <tr id="xdx_402_eus-gaap--IncreaseDecreaseInOtherOperatingAssets_i03N_di_msCzhzK_zhCg0iwgybz2" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="padding-left: 30pt; text-align: left">Other assets</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td style="text-align: right">(<ix:nonFraction name="us-gaap:IncreaseDecreaseInOtherOperatingAssets" contextRef="From2022-05-01to2022-07-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">13</ix:nonFraction></td><td style="text-align: left">)</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td style="text-align: right">(<ix:nonFraction name="us-gaap:IncreaseDecreaseInOtherOperatingAssets" contextRef="From2021-05-012021-07-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">20</ix:nonFraction></td><td style="text-align: left">)</td></tr>
  <tr id="xdx_404_eus-gaap--IncreaseDecreaseInAccountsPayable_i03_maCzhzK_zc94x0fMPTBi" style="vertical-align: bottom; background-color: White">
    <td style="padding-left: 30pt; text-align: left">Accounts payable</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td style="text-align: right"><ix:nonFraction name="us-gaap:IncreaseDecreaseInAccountsPayable" contextRef="From2022-05-01to2022-07-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">154</ix:nonFraction></td><td style="text-align: left">&#160;</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td style="text-align: right">(<ix:nonFraction name="us-gaap:IncreaseDecreaseInAccountsPayable" contextRef="From2021-05-012021-07-31" format="ixt:numdotdecimal" decimals="-3" scale="3" sign="-" unitRef="USD">233</ix:nonFraction></td><td style="text-align: left">)</td></tr>
  <tr id="xdx_403_ecustom--IncreaseDecreaseInAccruedExpenses_i03_maCzhzK_zlmYWqBzvHrg" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="padding-left: 30pt; text-align: left">Accrued expenses</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td style="text-align: right"><ix:nonFraction name="OPTT:IncreaseDecreaseInAccruedExpenses" contextRef="From2022-05-01to2022-07-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">212</ix:nonFraction></td><td style="text-align: left">&#160;</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td style="text-align: right">(<ix:nonFraction name="OPTT:IncreaseDecreaseInAccruedExpenses" contextRef="From2021-05-012021-07-31" format="ixt:numdotdecimal" decimals="-3" scale="3" sign="-" unitRef="USD">60</ix:nonFraction></td><td style="text-align: left">)</td></tr>
  <tr id="xdx_40B_ecustom--IncreaseDecreaseInLeaseLiability_i03_maCzhzK_zIhnXhn40qWa" style="vertical-align: bottom; background-color: White">
    <td style="padding-left: 30pt; text-align: left">Change in right of use lease liability</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td style="text-align: right">(<ix:nonFraction name="OPTT:IncreaseDecreaseInLeaseLiability" contextRef="From2022-05-01to2022-07-31" format="ixt:numdotdecimal" decimals="-3" scale="3" sign="-" unitRef="USD">82</ix:nonFraction></td><td style="text-align: left">)</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td style="text-align: right">(<ix:nonFraction name="OPTT:IncreaseDecreaseInLeaseLiability" contextRef="From2021-05-012021-07-31" format="ixt:numdotdecimal" decimals="-3" scale="3" sign="-" unitRef="USD">75</ix:nonFraction></td><td style="text-align: left">)</td></tr>
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    <td style="padding-left: 30pt; text-align: left">Contract liabilities</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td style="text-align: right">(<ix:nonFraction name="us-gaap:IncreaseDecreaseInContractWithCustomerLiability" contextRef="From2022-05-01to2022-07-31" format="ixt:numdotdecimal" decimals="-3" scale="3" sign="-" unitRef="USD">28</ix:nonFraction></td><td style="text-align: left">)</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td style="text-align: right"><span style="-sec-ix-hidden: xdx2ixbrl0377">&#8212;</span></td><td style="text-align: left">&#160;</td></tr>
  <tr id="xdx_401_ecustom--IncreaseDecreaseInLitigationPayable_i03_maCzhzK_zjIogrvv0kS1" style="vertical-align: bottom; background-color: White">
    <td style="padding-left: 30pt; text-align: left; padding-bottom: 1.5pt">Litigation payable</td><td style="padding-bottom: 1.5pt">&#160;</td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left">&#160;</td><td style="border-bottom: Black 1.5pt solid; text-align: right"><span style="-sec-ix-hidden: xdx2ixbrl0379">&#8212;</span></td><td style="padding-bottom: 1.5pt; text-align: left">&#160;</td><td style="padding-bottom: 1.5pt">&#160;</td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left">&#160;</td><td style="border-bottom: Black 1.5pt solid; text-align: right">(<ix:nonFraction name="OPTT:IncreaseDecreaseInLitigationPayable" contextRef="From2021-05-012021-07-31" format="ixt:numdotdecimal" decimals="-3" scale="3" sign="-" unitRef="USD">1,224</ix:nonFraction></td><td style="padding-bottom: 1.5pt; text-align: left">)</td></tr>
  <tr id="xdx_40D_eus-gaap--NetCashProvidedByUsedInOperatingActivities_i01T_mtCzhzK_maCzVxZ_zRDOvxidNSv6" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="padding-left: 40pt; text-align: left; padding-bottom: 1.5pt">Net cash used in operating activities</td><td style="padding-bottom: 1.5pt">&#160;</td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left">&#160;</td><td style="border-bottom: Black 1.5pt solid; text-align: right">(<ix:nonFraction name="us-gaap:NetCashProvidedByUsedInOperatingActivities" contextRef="From2022-05-01to2022-07-31" format="ixt:numdotdecimal" decimals="-3" scale="3" sign="-" unitRef="USD">5,092</ix:nonFraction></td><td style="padding-bottom: 1.5pt; text-align: left">)</td><td style="padding-bottom: 1.5pt">&#160;</td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left">&#160;</td><td style="border-bottom: Black 1.5pt solid; text-align: right">(<ix:nonFraction name="us-gaap:NetCashProvidedByUsedInOperatingActivities" contextRef="From2021-05-012021-07-31" format="ixt:numdotdecimal" decimals="-3" scale="3" sign="-" unitRef="USD">5,287</ix:nonFraction></td><td style="padding-bottom: 1.5pt; text-align: left">)</td></tr>
  <tr id="xdx_407_eus-gaap--NetCashProvidedByUsedInInvestingActivitiesAbstract_iB_zhAwbZEMuXVl" style="vertical-align: bottom; background-color: White">
    <td style="text-align: left">Cash flows from investing activities:</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><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>
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    <td style="padding-left: 10pt; text-align: left">Redemptions of marketable securities</td><td>&#160;</td>
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    <td style="text-align: left; padding-bottom: 1.5pt">Cash flows from financing activities:</td><td style="padding-bottom: 1.5pt">&#160;</td>
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<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">&#160;</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">See
accompanying notes to unaudited consolidated financial statements.</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">&#160;</span></p>


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    <div style="border-bottom: Black 1.5pt solid; margin-top: 0pt; 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 -->8<!-- Field: /Sequence --></td></tr></table></div>
    <div style="break-before: page; margin-top: 6pt; margin-bottom: 0pt"><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 Content</a></td></tr></table></div>
    <!-- Field: /Page -->

<p style="font: 10pt Times New Roman, Times, Serif; text-align: center; margin-top: 0pt; margin-bottom: 0pt"><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; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><span id="a_008"></span>Ocean
Power Technologies, Inc. and Subsidiaries</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>Notes
to Unaudited Consolidated Financial Statements</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">&#160;</span></p>

<ix:nonNumeric contextRef="From2022-05-01to2022-07-31" escape="true" name="us-gaap:BusinessDescriptionAndBasisOfPresentationTextBlock"><p id="xdx_806_eus-gaap--BusinessDescriptionAndBasisOfPresentationTextBlock_zwjjcXi76R6g" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(1)
<span id="xdx_82B_zQLSahbtkDE7">Background, Basis of Presentation and Liquidity</span></b></span></p>

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



<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-indent: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Ocean Power Technologies, Inc. (&#8220;OPTI&#8221;) was founded in 1984
in New Jersey, commenced business operations in 1994 and re-incorporated in Delaware in 2007. Ocean Power Technologies, Inc. acquired
3dent Technology, LLC (&#8220;3Dent&#8221;), in February 2021 and Marine Advanced Robotics, Inc. (&#8220;MAR&#8221;) in November 2021
which are now included as part of the OPTI. OPTI, along with its subsidiaries, (the &#8220;Company&#8221;) is a complete solutions provider,
controlling the design, manufacturing, sales, installation, operations and maintenance of its products and services. The Company&#8217;s
solutions provide distributed offshore power and data 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 the Company&#8217;s goal is to generate the majority of its revenues
from the sale or lease of its products and solutions, and sales of services to support business operations.</span></p>

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



<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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 8 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, 2022,
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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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)</i></b></span> <span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>Liquidity</i></b></span></p>



<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">For
the three months ended July 31, 2022, the Company incurred net losses of approximately $<span id="xdx_90F_eus-gaap--NetIncomeLoss_iN_pn5n6_di_c20220501__20220731_zllaE0mWMFse" title="Net loss"><ix:nonFraction name="us-gaap:NetIncomeLoss" contextRef="From2022-05-01to2022-07-31" format="ixt:numdotdecimal" decimals="-5" scale="6" sign="-" unitRef="USD">5.9</ix:nonFraction></span>
million, used cash in operations of approximately $<span id="xdx_90F_eus-gaap--NetCashProvidedByUsedInOperatingActivities_iN_pn5n6_di_c20220501__20220731_zWgehvsOgiYf" title="Cash in operations"><ix:nonFraction name="us-gaap:NetCashProvidedByUsedInOperatingActivities" contextRef="From2022-05-01to2022-07-31" format="ixt:numdotdecimal" decimals="-5" scale="6" sign="-" unitRef="USD">5.1</ix:nonFraction></span>
million and has an accumulated deficit of approximately $<span id="xdx_90D_eus-gaap--RetainedEarningsAccumulatedDeficit_iNI_pn5n6_di_c20220731_z1lZzigeENFe" title="Accumulated deficit"><ix:nonFraction name="us-gaap:RetainedEarningsAccumulatedDeficit" contextRef="AsOf2022-07-31" format="ixt:numdotdecimal" decimals="-5" scale="6" sign="-" unitRef="USD">259.6</ix:nonFraction></span>
million. The Company has continued to make investments in ongoing product development efforts in anticipation of future growth, as
evidenced by its acquisition of MAR 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, 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. Management believes the
Company&#8217;s current cash balance at July 31, 2022 of $<span id="xdx_909_eus-gaap--Cash_iI_pn5n6_c20220731_zgq1svZKLed7" title="Cash"><ix:nonFraction name="us-gaap:Cash" contextRef="AsOf2022-07-31" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">9.4</ix:nonFraction></span>
million and marketable securities balance of $<span id="xdx_901_eus-gaap--ShortTermInvestments_iI_pn5n6_c20220731_zYUpjcQON6Ik" title="Short-term investments"><ix:nonFraction name="us-gaap:ShortTermInvestments" contextRef="AsOf2022-07-31" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">42.7</ix:nonFraction></span>
million is sufficient to fund its planned expenditures through at least September 2023.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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;), having
capacity up to $<span id="xdx_907_eus-gaap--LineOfCreditFacilityMaximumBorrowingCapacity_iI_pn5n6_c20201120__us-gaap--TypeOfArrangementAxis__custom--TwoThousandTwentyATMFacilityMember__dei--LegalEntityAxis__custom--AGPAllianceGlobalPartnersMember_zlBwiVnAQbQi" title="Offering amount capacity"><ix:nonFraction name="us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity" contextRef="AsOf2020-11-20_custom_TwoThousandTwentyATMFacilityMember_custom_AGPAllianceGlobalPartnersMember" 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_90A_eus-gaap--ProceedsFromIssuanceOfCommonStock_pn5n6_c20201203__20201204__us-gaap--TypeOfArrangementAxis__custom--TwoThousandTwentyATMFacilityMember__dei--LegalEntityAxis__custom--AGPAllianceGlobalPartnersMember_zMPzA3r1WGB6" title="Proceeds from initial public offering"><ix:nonFraction name="us-gaap:ProceedsFromIssuanceOfCommonStock" contextRef="From2020-12-032020-12-04_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 July 31, 2021, the Company had sold
and issued an aggregate of <span id="xdx_90C_eus-gaap--SaleOfStockNumberOfSharesIssuedInTransaction_c20201120__20210731__us-gaap--TypeOfArrangementAxis__custom--TwoThousandTwentyATMFacilityMember__dei--LegalEntityAxis__custom--AGPAllianceGlobalPartnersMember_zKRr4JJL81v1" title="Number of common stock shares sold"><ix:nonFraction name="us-gaap:SaleOfStockNumberOfSharesIssuedInTransaction" contextRef="From2020-11-202021-07-31_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_c20201120__20210731__us-gaap--TypeOfArrangementAxis__custom--TwoThousandTwentyATMFacilityMember__dei--LegalEntityAxis__custom--AGPAllianceGlobalPartnersMember_z5U6IZelsDI7" title="Proceeds from issuance or sale of equity, net of issuance costs"><ix:nonFraction name="us-gaap:SaleOfStockConsiderationReceivedPerTransaction" contextRef="From2020-11-202021-07-31_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_c20210731__us-gaap--TypeOfArrangementAxis__custom--TwoThousandTwentyATMFacilityMember__dei--LegalEntityAxis__custom--AGPAllianceGlobalPartnersMember_zixF8yZtjF8k" title="Combined purchase price per share"><ix:nonFraction name="us-gaap:SaleOfStockPricePerShare" contextRef="AsOf2021-07-31_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_90C_ecustom--PaymentOfSalesCommission_pn5n6_c20201120__20210731__us-gaap--TypeOfArrangementAxis__custom--TwoThousandTwentyATMFacilityMember__dei--LegalEntityAxis__custom--AGPAllianceGlobalPartnersMember_zfuCnYo9XF2k" title="Payment of sales commission"><ix:nonFraction name="OPTT:PaymentOfSalesCommission" contextRef="From2020-11-202021-07-31_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_90B_eus-gaap--ProceedsFromIssuanceOfCommonStock_pn5n6_c20220109__20220110__us-gaap--TypeOfArrangementAxis__custom--TwoThousandTwentyATMFacilityMember_zj9zIP5mH8A9"><ix:nonFraction name="us-gaap:ProceedsFromIssuanceOfCommonStock" contextRef="From2022-01-092022-01-10_custom_TwoThousandTwentyATMFacilityMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">25.0</ix:nonFraction></span> million (or an aggregate of $<span id="xdx_900_eus-gaap--SaleOfStockConsiderationReceivedPerTransaction_pn5n6_c20220109__20220110__us-gaap--TypeOfArrangementAxis__custom--TwoThousandTwentyATMFacilityMember_zhj5p8ukrZY5" title="Proceeds from issuance or sale of equity, net of issuance costs"><ix:nonFraction name="us-gaap:SaleOfStockConsiderationReceivedPerTransaction" contextRef="From2022-01-092022-01-10_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-top: 0pt; margin-bottom: 0pt; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>


<ix:exclude><!-- Field: Page; Sequence: 9; Value: 2 -->
    <div style="border-bottom: Black 1.5pt solid; margin-top: 0pt; 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; margin-bottom: 0pt"><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 Content</a></td></tr></table></div>
    <!-- Field: /Page --></ix:exclude>

<p style="font: 10pt Times New Roman, Times, Serif; text-align: center; margin-top: 0pt; margin-bottom: 0pt"><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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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 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_900_ecustom--StockIssuedDuringPeriodValueIssuedForCommitmentFee_c20200914__20200918__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_pn5n6" 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_90A_ecustom--PercentageOfOutstandingCommonStockLimitForShareholderApproval_pid_c20200914__20200918__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_ztKAHqxE0y91" 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 <span id="xdx_90F_ecustom--PercentageOfOutstandingCommonStockLimitForShareholderApproval_pid_c20200914__20200918__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_zPa8PIyPSq39" 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> limit was <span id="xdx_90C_ecustom--StockIssuedDuringPeriodSharesCanBeIssuedBasedUponOutstandingPercentage_pid_c20200914__20200918__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_zluDrNHL1co7" 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_906_ecustom--NumberOfAdditionalSharesThatCanBeIssuedUponShareholderApproval_pid_c20201222__20201223__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_zr5rnf3WR5Sg" 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 which exceeds the <span id="xdx_901_ecustom--PercentageOfOutstandingCommonStockLimitForShareholderApproval_pid_c20201222__20201223__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_zSoDmSyj3Za7" 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 July 31, 2022, the Company had sold an aggregate of <span id="xdx_90D_eus-gaap--SaleOfStockNumberOfSharesIssuedInTransaction_c20220501__20220731__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_zZ0vNTGG2Enh" title="Number of common stock shares sold"><ix:nonFraction name="us-gaap:SaleOfStockNumberOfSharesIssuedInTransaction" contextRef="From2022-05-012022-07-31_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_90C_eus-gaap--SaleOfStockConsiderationReceivedPerTransaction_pn5n6_c20220501__20220731__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_zrVcGjMij673" title="Proceeds from issuance or sale of equity, net of issuance costs"><ix:nonFraction name="us-gaap:SaleOfStockConsiderationReceivedPerTransaction" contextRef="From2022-05-012022-07-31_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_908_eus-gaap--SaleOfStockPricePerShare_iI_c20220731__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_zEl1EohcoVla" title="Combined purchase price per share"><ix:nonFraction name="us-gaap:SaleOfStockPricePerShare" contextRef="AsOf2022-07-31_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_ecustom--SaleOfStockConsiderationReceivedPerTransactionRemaining_pn5n6_c20220501__20220731__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_zvGYHaQByGIj" title="Proceeds from issuance or sale of equity, net of issuance costs"><ix:nonFraction name="OPTT:SaleOfStockConsiderationReceivedPerTransactionRemaining" contextRef="From2022-05-012022-07-31_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 July 31, 2022.</span></p>
<!-- Field: Split-Segment; Name: 001 -->
<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

</ix:nonNumeric><ix:nonNumeric contextRef="From2022-05-01to2022-07-31" escape="true" name="us-gaap:SignificantAccountingPoliciesTextBlock"><p id="xdx_802_eus-gaap--SignificantAccountingPoliciesTextBlock_zUcK4VwVpzTi" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(2)
<span id="xdx_82A_zBU4H5rCVvF4">Summary of Significant Accounting Policies</span></b></span></p>

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

<ix:nonNumeric contextRef="From2022-05-01to2022-07-31" escape="true" name="us-gaap:ConsolidationPolicyTextBlock"><p id="xdx_84D_eus-gaap--ConsolidationPolicyTextBlock_zy0U9TtxwgZ6" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>(a)
<span id="xdx_862_zOOXfzGk1VWc">Consolidation</span></i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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, Ocean Power Technologies
Ltd. in the United Kingdom, and Ocean Power Technologies (Australasia) Pty Ltd. in Australia (&#8220;OPT-A&#8221;). OPT-A is in the process
of being liquidated. All documents have been filed with the Australian Tax Organization and the Company expects this to be completed
in the second quarter of the current fiscal year. All significant intercompany accounts and transactions have been eliminated in consolidation.</span></p>

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

</ix:nonNumeric><ix:nonNumeric contextRef="From2022-05-01to2022-07-31" escape="true" name="us-gaap:UseOfEstimates"><p id="xdx_844_eus-gaap--UseOfEstimates_zg0FcSINI2wa" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>(b)
<span id="xdx_86E_zliy00geaJul">Use of Estimates</span></i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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, stock-based
compensation, 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 hours and costs
to complete projects 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

</ix:nonNumeric><ix:nonNumeric contextRef="From2022-05-01to2022-07-31" escape="true" name="us-gaap:CashAndCashEquivalentsRestrictedCashAndCashEquivalentsPolicy"><p id="xdx_84E_eus-gaap--CashAndCashEquivalentsRestrictedCashAndCashEquivalentsPolicy_zaxnFNkuk5ba" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>(c)
<span id="xdx_86C_zoAE1d1Nc6Wf">Cash, Cash Equivalents, Restricted, Security Agreements and Marketable Securities</span></i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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 or in marketable securities. The following table summarizes cash and cash equivalents
as of July 31, 2022 and April 30, 2022:</span></p>

<ix:nonNumeric contextRef="From2022-05-01to2022-07-31" escape="true" name="us-gaap:ScheduleOfCashAndCashEquivalentsTableTextBlock"><p id="xdx_899_eus-gaap--ScheduleOfCashAndCashEquivalentsTableTextBlock_z2mEzmhIBMT7" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_8B4_zeno9R6Dqtwd" style="display: none">Schedule of Cash and Cash Equivalents</span></span></p>

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    <td style="border-bottom: Black 1.5pt solid; text-align: left">&#160;</td><td id="xdx_982_eus-gaap--CashAndCashEquivalentsAtCarryingValue_iI_pn3n3_c20220731__us-gaap--CashAndCashEquivalentsAxis__us-gaap--MoneyMarketFundsMember_zxC9aaEj0T74" title="Cash and cash equivalents" style="border-bottom: Black 1.5pt solid; text-align: right"><ix:nonFraction name="us-gaap:CashAndCashEquivalentsAtCarryingValue" contextRef="AsOf2022-07-31_us-gaap_MoneyMarketFundsMember" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">7,147</ix:nonFraction></td><td style="padding-bottom: 1.5pt; text-align: left">&#160;</td><td style="padding-bottom: 1.5pt">&#160;</td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left">&#160;</td><td id="xdx_980_eus-gaap--CashAndCashEquivalentsAtCarryingValue_iI_pn3n3_c20220430__us-gaap--CashAndCashEquivalentsAxis__us-gaap--MoneyMarketFundsMember_zfhRJOMZL0Kf" title="Cash and cash equivalents" style="border-bottom: Black 1.5pt solid; text-align: right"><ix:nonFraction name="us-gaap:CashAndCashEquivalentsAtCarryingValue" contextRef="AsOf2022-04-30_us-gaap_MoneyMarketFundsMember" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">6,070</ix:nonFraction></td><td style="padding-bottom: 1.5pt; text-align: left">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="padding-bottom: 2.5pt">&#160;</td><td style="padding-bottom: 2.5pt">&#160;</td>
    <td style="border-bottom: Black 2.5pt double; text-align: left">$</td><td id="xdx_985_eus-gaap--CashAndCashEquivalentsAtCarryingValue_iI_pn3n3_c20220731_zk7z4N27ervh" title="Cash and cash equivalents" style="border-bottom: Black 2.5pt double; text-align: right"><ix:nonFraction name="us-gaap:CashAndCashEquivalentsAtCarryingValue" contextRef="AsOf2022-07-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">9,176</ix:nonFraction></td><td style="padding-bottom: 2.5pt; text-align: left">&#160;</td><td style="padding-bottom: 2.5pt">&#160;</td>
    <td style="border-bottom: Black 2.5pt double; text-align: left">$</td><td id="xdx_98E_eus-gaap--CashAndCashEquivalentsAtCarryingValue_iI_pn3n3_c20220430_zlkkwhY2mE2i" title="Cash and cash equivalents" style="border-bottom: Black 2.5pt double; text-align: right"><ix:nonFraction name="us-gaap:CashAndCashEquivalentsAtCarryingValue" contextRef="AsOf2022-04-30" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">7,885</ix:nonFraction></td><td style="padding-bottom: 2.5pt; text-align: left">&#160;</td></tr>
  </table>

</ix:nonNumeric><p id="xdx_8AE_zpOVZJDTs09h" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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_906_eus-gaap--Deposits_iI_c20220731__us-gaap--TypeOfArrangementAxis__custom--RestrictedCashAndSecurityAgreementsMember__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--SantanderBankMember__us-gaap--ShortTermDebtTypeAxis__us-gaap--LetterOfCreditMember_zmjus2Yp2fMc" title="Deposits"><ix:nonFraction name="us-gaap:Deposits" contextRef="AsOf2022-07-31_custom_RestrictedCashAndSecurityAgreementsMember_custom_SantanderBankMember_us-gaap_LetterOfCreditMember" format="ixt:numdotdecimal" decimals="0" unitRef="USD">154,000</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 the bank.</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">&#160;</span></p>


<ix:exclude><!-- Field: Page; Sequence: 10; Value: 2 -->
    <div style="border-bottom: Black 1.5pt solid; margin-top: 0pt; 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; margin-bottom: 0pt"><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 Content</a></td></tr></table></div>
    <!-- Field: /Page --></ix:exclude>

<p style="font: 10pt Times New Roman, Times, Serif; text-align: center; 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Santander
also issued a letter of credit to subsidiaries of Enel Green Power (&#8220;EGP&#8221;) pursuant to the Company&#8217;s contracts with
EGP. This letter of credit was originally issued in the amount of $<span id="xdx_904_eus-gaap--LettersOfCreditOutstandingAmount_iI_c20200831__us-gaap--TypeOfArrangementAxis__custom--RestrictedCashAndSecurityAgreementsMember__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--SantanderBankMember__us-gaap--ShortTermDebtTypeAxis__custom--LetterOneMember_zITRrjl16il7" title="Letters of credit outstanding, Amount"><ix:nonFraction name="us-gaap:LettersOfCreditOutstandingAmount" contextRef="AsOf2020-08-31_custom_RestrictedCashAndSecurityAgreementsMember_custom_SantanderBankMember_custom_LetterOneMember" format="ixt:numdotdecimal" decimals="0" unitRef="USD">645,000</ix:nonFraction></span> and was reduced to $<span id="xdx_908_eus-gaap--LettersOfCreditOutstandingAmount_iI_pp0p0_c20200831__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--SantanderBankMember__us-gaap--ShortTermDebtTypeAxis__custom--LetterTwoMember__us-gaap--AwardDateAxis__custom--AugustTwentyTwentyMember_zPryBf3RlNqg"><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> in August 2020. The letter of
credit will be reduced by an additional $<span id="xdx_909_ecustom--LettersOfCreditIssuedAmount_iI_pp0p0_c20220731__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--SantanderBankMember__us-gaap--ShortTermDebtTypeAxis__custom--LetterTwoMember_zfWIdANCv4H7"><ix:nonFraction name="OPTT:LettersOfCreditIssuedAmount" contextRef="AsOf2022-07-31_custom_SantanderBankMember_custom_LetterTwoMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">258,000</ix:nonFraction></span> once the PowerBuoy&#174; (&#8220;PB3&#8221;) and its accompanying systems pass final
acceptance testing. The remaining restricted amount of $<span id="xdx_90F_ecustom--LettersOfCreditIssuedAmount_iI_c20220731__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--SantanderBankMember_zEt4FZkuNJFk" title="Letters of credit issued amount"><ix:nonFraction name="OPTT:LettersOfCreditIssuedAmount" contextRef="AsOf2022-07-31_custom_SantanderBankMember" format="ixt:numdotdecimal" decimals="0" unitRef="USD">65,000</ix:nonFraction></span> will be released 12 months after the buoy is fully deployed.</span></p>

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

<ix:nonNumeric contextRef="From2022-05-01to2022-07-31" escape="true" name="us-gaap:ScheduleOfRestrictedCashAndCashEquivalentsTextBlock"><p id="xdx_894_eus-gaap--ScheduleOfRestrictedCashAndCashEquivalentsTextBlock_zK4GorEL60m1" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_8BD_zxublpbXDUyi" 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="display: none; vertical-align: bottom; background-color: White">
    <td style="text-align: left">&#160;</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td id="xdx_493_20220731_zh4GFdLidXm8" style="text-align: right">&#160;</td><td style="text-align: left">&#160;</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td id="xdx_496_20220430" style="text-align: right">&#160;</td><td style="text-align: left">&#160;</td></tr>
<tr style="vertical-align: bottom">
    <td>&#160;</td><td style="font-weight: bold; padding-bottom: 1.5pt">&#160;</td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center">July 31, 2022</td><td style="padding-bottom: 1.5pt; font-weight: bold">&#160;</td><td style="font-weight: bold; padding-bottom: 1.5pt">&#160;</td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center">April 30, 2022</td><td style="padding-bottom: 1.5pt; font-weight: bold">&#160;</td></tr>
  <tr style="vertical-align: bottom">
    <td>&#160;</td><td>&#160;</td>
    <td colspan="6" style="text-align: center">(in thousands)</td><td>&#160;</td></tr>
  <tr id="xdx_40E_eus-gaap--CashAndCashEquivalentsAtCarryingValue_iI_pn3n3" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="width: 60%; text-align: left">Cash and cash equivalents</td><td style="width: 2%">&#160;</td>
    <td style="width: 1%; text-align: left">$</td><td style="width: 16%; text-align: right"><ix:nonFraction name="us-gaap:CashAndCashEquivalentsAtCarryingValue" contextRef="AsOf2022-07-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">9,176</ix:nonFraction></td><td style="width: 1%; text-align: left">&#160;</td><td style="width: 2%">&#160;</td>
    <td style="width: 1%; text-align: left">$</td><td style="width: 16%; text-align: right"><ix:nonFraction name="us-gaap:CashAndCashEquivalentsAtCarryingValue" contextRef="AsOf2022-04-30" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">7,885</ix:nonFraction></td><td style="width: 1%; text-align: left">&#160;</td></tr>
  <tr id="xdx_401_eus-gaap--RestrictedCashCurrent_iI_pn3n3" style="vertical-align: bottom; background-color: White">
    <td style="text-align: left">Restricted cash- short term</td><td>&#160;</td>
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    <td style="text-align: left">&#160;</td><td style="text-align: right"><ix:nonFraction name="us-gaap:RestrictedCashCurrent" contextRef="AsOf2022-04-30" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">258</ix:nonFraction></td><td style="text-align: left">&#160;</td></tr>
  <tr id="xdx_40F_eus-gaap--RestrictedCashNoncurrent_iI_pn3n3" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left; padding-bottom: 1.5pt">Restricted cash- long term</td><td style="padding-bottom: 1.5pt">&#160;</td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left">&#160;</td><td style="border-bottom: Black 1.5pt solid; text-align: right"><ix:nonFraction name="us-gaap:RestrictedCashNoncurrent" contextRef="AsOf2022-07-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">219</ix:nonFraction></td><td style="padding-bottom: 1.5pt; text-align: left">&#160;</td><td style="padding-bottom: 1.5pt">&#160;</td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left">&#160;</td><td style="border-bottom: Black 1.5pt solid; text-align: right"><ix:nonFraction name="us-gaap:RestrictedCashNoncurrent" contextRef="AsOf2022-04-30" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">219</ix:nonFraction></td><td style="padding-bottom: 1.5pt; text-align: left">&#160;</td></tr>
  <tr id="xdx_40B_eus-gaap--CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_iI_pn3n3_zPoAY8k6bTKg" style="vertical-align: bottom; background-color: White">
    <td style="padding-bottom: 2.5pt"><span style="display: none; font-family: Times New Roman, Times, Serif; font-size: 10pt">Cash, cash equivalents,
    restricted cash and restricted cash equivalents</span></td><td style="padding-bottom: 2.5pt">&#160;</td>
    <td style="border-bottom: Black 2.5pt double; text-align: left">$</td><td style="border-bottom: Black 2.5pt double; text-align: right"><ix:nonFraction name="us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" contextRef="AsOf2022-07-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">9,653</ix:nonFraction></td><td style="padding-bottom: 2.5pt; text-align: left">&#160;</td><td style="padding-bottom: 2.5pt">&#160;</td>
    <td style="border-bottom: Black 2.5pt double; text-align: left">$</td><td style="border-bottom: Black 2.5pt double; text-align: right"><ix:nonFraction name="us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" contextRef="AsOf2022-04-30" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">8,362</ix:nonFraction></td><td style="padding-bottom: 2.5pt; text-align: left">&#160;</td></tr>
  </table>

</ix:nonNumeric><p id="xdx_8AF_zb501wK86kH2" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><i>Marketable
Securities</i></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">During
fiscal 2022, the Company acquired investment securities through Charles Schwab Bank. As of July 31, 2022 and April 30, 2022, their
value was approximately $<span id="xdx_90B_eus-gaap--AlternativeInvestment_iI_pn5n6_c20220731_zK7gerDVwuha" title="Investment securities"><ix:nonFraction name="us-gaap:AlternativeInvestment" contextRef="AsOf2022-07-31" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">42.7</ix:nonFraction></span>
million and $<span id="xdx_901_eus-gaap--AlternativeInvestment_iI_pn5n6_c20220430_zvnTCS0Curmf"><ix:nonFraction name="us-gaap:AlternativeInvestment" contextRef="AsOf2022-04-30" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">49.4</ix:nonFraction></span> million, respectively.
All marketable securities consist of corporate bonds, government agency bonds, or U.S. Treasury Notes and Bonds, are investment
grade rated or better, and mature within 12 months. The Company has the means and intends to hold all investments to maturity, and
as such are classified as held-to-maturity investments and carried at amortized cost. The total recognized interest expense on the
premium we paid for the securities as of July 31, 2022 and 2021 is approximately <span>$<span id="xdx_903_eus-gaap--InvestmentIncomeNetAmortizationOfDiscountAndPremium_pn5n6_c20220501__20220731_z8CzZCnSUQcd" title="Discount and premium"><ix:nonFraction name="us-gaap:InvestmentIncomeNetAmortizationOfDiscountAndPremium" contextRef="From2022-05-01to2022-07-31" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">0.1</ix:nonFraction></span>
million and <span id="xdx_908_eus-gaap--InvestmentIncomeNetAmortizationOfDiscountAndPremium_dc_c20210501__20210731_zdPYMZcgV65l"><ix:nonFraction name="us-gaap:InvestmentIncomeNetAmortizationOfDiscountAndPremium" contextRef="From2021-05-012021-07-31" format="ixt-sec:numwordsen" decimals="0" unitRef="USD">zero</ix:nonFraction></span></span>,
respectively, on an amortized cost basis of approximately $<span id="xdx_907_eus-gaap--TradingSecuritiesDebtAmortizedCost_iI_pn5n6_c20220731_zPQbCWbzjE0i" title="Investment owned at cost"><ix:nonFraction name="us-gaap:TradingSecuritiesDebtAmortizedCost" contextRef="AsOf2022-07-31" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">0.3</ix:nonFraction></span>
million and <span id="xdx_90E_eus-gaap--TradingSecuritiesDebtAmortizedCost_iI_dc_c20210731_zkobbCmIcW3"><ix:nonFraction name="us-gaap:TradingSecuritiesDebtAmortizedCost" contextRef="AsOf2021-07-31" format="ixt-sec:numwordsen" decimals="0" unitRef="USD">zero</ix:nonFraction></span>, respectively.
Additionally, there has been no impairment on these investments.</span></p>

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

<ix:nonNumeric contextRef="From2022-05-01to2022-07-31" escape="true" name="us-gaap:UnrealizedGainLossOnInvestmentsTableTextBlock"><p id="xdx_89C_eus-gaap--UnrealizedGainLossOnInvestmentsTableTextBlock_zy0USolL0Yg8" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
following table summarizes the Company&#8217;s marketable securities as of July 31, 2022:</span></p>

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

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_8B5_z9L3fZ3W0lYc" style="display: none">Schedule of Investments and Unrealized Gains/Losses</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="border-bottom: Black 1.5pt solid; font-weight: bold">Category (in thousands)</td><td style="padding-bottom: 1.5pt; font-weight: bold">&#160;</td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center">Market Value</td><td style="padding-bottom: 1.5pt; font-weight: bold">&#160;</td><td style="padding-bottom: 1.5pt; font-weight: bold">&#160;</td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center">Unrealized <br />
Gains (Losses)</td><td style="padding-bottom: 1.5pt; font-weight: bold">&#160;</td><td style="padding-bottom: 1.5pt; font-weight: bold">&#160;</td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center">Adjusted Cost</td><td style="padding-bottom: 1.5pt; font-weight: bold">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="width: 40%; text-align: left">Corporate Bonds</td><td style="width: 2%">&#160;</td>
    <td style="width: 1%; text-align: left">$</td><td id="xdx_983_eus-gaap--MoneyMarketFundsAtCarryingValue_iI_pn3n3_c20220731__us-gaap--InvestmentTypeAxis__custom--CorporateBondsMember_zbVEsGcwCJ3e" style="width: 16%; text-align: right"><ix:nonFraction name="us-gaap:MoneyMarketFundsAtCarryingValue" contextRef="AsOf2022-07-31_custom_CorporateBondsMember" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">31,853</ix:nonFraction></td><td style="width: 1%; text-align: left">&#160;</td><td style="width: 2%">&#160;</td>
    <td style="width: 1%; text-align: left">$</td><td id="xdx_989_eus-gaap--UnrealizedGainLossOnInvestments_pn3n3_c20220501__20220731__us-gaap--InvestmentTypeAxis__custom--CorporateBondsMember_zMPadx01Tevd" title="Unrealized Gains (Losses)" style="width: 16%; text-align: right"><ix:nonFraction name="us-gaap:UnrealizedGainLossOnInvestments" contextRef="From2022-05-012022-07-31_custom_CorporateBondsMember" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">151</ix:nonFraction></td><td style="width: 1%; text-align: left"></td><td style="width: 2%">&#160;</td>
    <td style="width: 1%; text-align: left">$</td><td id="xdx_98D_eus-gaap--InvestmentOwnedAtCost_iI_pn3n3_c20220731__us-gaap--InvestmentTypeAxis__custom--CorporateBondsMember_ztHmMv2Rflw8" title="Total Cost" style="width: 16%; text-align: right"><ix:nonFraction name="us-gaap:InvestmentOwnedAtCost" contextRef="AsOf2022-07-31_custom_CorporateBondsMember" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">32,004</ix:nonFraction></td><td style="width: 1%; text-align: left">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td style="text-align: left">Government Bonds &amp; Notes</td><td>&#160;</td>
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  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left">Government Agency</td><td>&#160;</td>
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  <tr style="vertical-align: bottom; background-color: White">
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  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left; padding-bottom: 2.5pt">Total Marketable Securities</td><td style="padding-bottom: 2.5pt">&#160;</td>
    <td style="border-bottom: Black 2.5pt double; text-align: left">$</td><td id="xdx_98C_eus-gaap--MoneyMarketFundsAtCarryingValue_iI_pn3n3_c20220731_zakQom9mo99e" title="Market Value" style="border-bottom: Black 2.5pt double; text-align: right"><ix:nonFraction name="us-gaap:MoneyMarketFundsAtCarryingValue" contextRef="AsOf2022-07-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">42,648</ix:nonFraction></td><td style="padding-bottom: 2.5pt; text-align: left">&#160;</td><td style="padding-bottom: 2.5pt">&#160;</td>
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    <td style="border-bottom: Black 2.5pt double; text-align: left">$</td><td id="xdx_986_eus-gaap--InvestmentOwnedAtCost_iI_pn3n3_c20220731_zV6uJbdPQM6i" title="Total Cost" style="border-bottom: Black 2.5pt double; text-align: right"><ix:nonFraction name="us-gaap:InvestmentOwnedAtCost" contextRef="AsOf2022-07-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">42,724</ix:nonFraction></td><td style="padding-bottom: 2.5pt; text-align: left">&#160;</td></tr>
  </table>

</ix:nonNumeric><p id="xdx_8A0_z93hOAE3fV8j" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>&#160;</i></b></span></p>

</ix:nonNumeric><ix:nonNumeric contextRef="From2022-05-01to2022-07-31" escape="true" name="us-gaap:ConcentrationRiskCreditRisk"><p id="xdx_843_eus-gaap--ConcentrationRiskCreditRisk_zhyngZhx0eec" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>(d)
<span id="xdx_86A_zd4lzaSIJqL5">Concentration of Credit Risk</span></i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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 trade accounts receivable, marketable securities
and cash. The Company believes that its credit risk is limited because the Company&#8217;s current contracts are with companies with
a reliable payment history. The Company invests its excess cash in a money market fund and short term held-to maturity investment and
does not believe that it is exposed to any significant risks related to its cash accounts, money market fund, or held-to maturity investments.
Cash is also maintained at foreign financial institutions. Cash in foreign financial institutions as of July 31, 2022 was approximately
$<span id="xdx_901_eus-gaap--CashAndCashEquivalentsAtCarryingValue_iI_c20220731__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--ForeignFinancialInstitutionsMember_zSrmd6XLlCah" title="Cash and cash equivalents"><ix:nonFraction name="us-gaap:CashAndCashEquivalentsAtCarryingValue" contextRef="AsOf2022-07-31_custom_ForeignFinancialInstitutionsMember" format="ixt:numdotdecimal" decimals="0" unitRef="USD">24,000</ix:nonFraction></span>.</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">&#160;</span></p>


<ix:exclude><!-- Field: Page; Sequence: 11; Value: 2 -->
    <div style="border-bottom: Black 1.5pt solid; margin-top: 0pt; 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; margin-bottom: 0pt"><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 Content</a></td></tr></table></div>
    <!-- Field: /Page --></ix:exclude>

<p style="font: 10pt Times New Roman, Times, Serif; text-align: center; 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">For the three months ended July 31, 2022 and 2021, the Company had three
and two customers whose revenues accounted for at least 10% of the Company&#8217;s consolidated revenues, respectively. These revenue
accounted for approximately <span id="xdx_90A_eus-gaap--ConcentrationRiskPercentage1_pid_dp_uPure_c20220501__20220731__us-gaap--ConcentrationRiskByBenchmarkAxis__us-gaap--SalesRevenueNetMember__us-gaap--ConcentrationRiskByTypeAxis__us-gaap--CustomerConcentrationRiskMember__srt--MajorCustomersAxis__custom--ThreeAndTwoCustomersMember_zZULkty2L83i" title="Concentration risk percentage"><ix:nonFraction name="us-gaap:ConcentrationRiskPercentage1" contextRef="From2022-05-012022-07-31_us-gaap_SalesRevenueNetMember_us-gaap_CustomerConcentrationRiskMember_custom_ThreeAndTwoCustomersMember" format="ixt:numdotdecimal" decimals="INF" scale="-2" unitRef="Pure">69</ix:nonFraction>%</span> and <span id="xdx_90E_eus-gaap--ConcentrationRiskPercentage1_pid_dp_uPure_c20210501__20210731__us-gaap--ConcentrationRiskByBenchmarkAxis__us-gaap--SalesRevenueNetMember__us-gaap--ConcentrationRiskByTypeAxis__us-gaap--CustomerConcentrationRiskMember__srt--MajorCustomersAxis__custom--ThreeAndTwoCustomersMember_zWyNdRNlwj2d" title="Concentration risk percentage"><ix:nonFraction name="us-gaap:ConcentrationRiskPercentage1" contextRef="From2021-05-012021-07-31_us-gaap_SalesRevenueNetMember_us-gaap_CustomerConcentrationRiskMember_custom_ThreeAndTwoCustomersMember" format="ixt:numdotdecimal" decimals="INF" scale="-2" unitRef="Pure">88</ix:nonFraction>%</span> of the Company&#8217;s total revenue for the respective periods.</span></p>

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


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

</ix:nonNumeric><ix:nonNumeric contextRef="From2022-05-01to2022-07-31" escape="true" name="us-gaap:ShareBasedCompensationOptionAndIncentivePlansPolicy"><p id="xdx_844_eus-gaap--ShareBasedCompensationOptionAndIncentivePlansPolicy_zOFgg3OGWX34" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>(e)
<span id="xdx_861_zuRz3CqFkZa6">Share-Based Compensation</span></i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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
aggregate share-based compensation expense recorded in the Consolidated Statements of Operations for the three months ended July 31,
2022 and 2021 was approximately $<span id="xdx_904_eus-gaap--EmployeeBenefitsAndShareBasedCompensation_pn5n6_c20220501__20220731_zYP0Yjn2N4De" title="Share based compensation"><ix:nonFraction name="us-gaap:EmployeeBenefitsAndShareBasedCompensation" contextRef="From2022-05-01to2022-07-31" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">0.3</ix:nonFraction></span> million and $<span id="xdx_90C_eus-gaap--EmployeeBenefitsAndShareBasedCompensation_pn5n6_c20210501__20210731_zcJcrwZiD7m3" title="Share based compensation"><ix:nonFraction name="us-gaap:EmployeeBenefitsAndShareBasedCompensation" contextRef="From2021-05-012021-07-31" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">0.4</ix:nonFraction></span> million, respectively.</span></p>

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

</ix:nonNumeric><ix:nonNumeric contextRef="From2022-05-01to2022-07-31" escape="true" name="us-gaap:RevenueFromContractWithCustomerPolicyTextBlock"><p id="xdx_84C_eus-gaap--RevenueFromContractWithCustomerPolicyTextBlock_zmUPHVYHhezi" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(f)
<i><span id="xdx_867_zjoHurDamM4d">Revenue Recognition</span></i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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 July 31, 2022 and 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 in costs of goods sold, and regular shipping and handling activities charged to operating
expenses.</span></p>

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


<ix:exclude><!-- Field: Page; Sequence: 12; Value: 2 -->
    <div style="border-bottom: Black 1.5pt solid; margin-top: 0pt; 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 -->12<!-- Field: /Sequence --></td></tr></table></div>
    <div style="break-before: page; margin-top: 6pt; margin-bottom: 0pt"><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 Content</a></td></tr></table></div>
    <!-- Field: /Page --></ix:exclude>

<p style="font: 10pt Times New Roman, Times, Serif; text-align: center; 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-top: 0pt; margin-bottom: 0pt; margin-left: 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, fixed-price contracts, time and material agreements, or lease agreements. 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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 three-month periods ended July 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Time
and materials agreements are billed based solely on the cost of time spent working on the contract and the material used.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">As
of July 31, 2022, the Company&#8217;s total remaining performance obligations, also referred to as backlog, totaled $<span id="xdx_902_eus-gaap--RevenueRemainingPerformanceObligation_iI_pn5n6_c20220731_zKAvsRrnxtCe" title="Revenue remaining performance obligation"><ix:nonFraction name="us-gaap:RevenueRemainingPerformanceObligation" contextRef="AsOf2022-07-31" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">0.3</ix:nonFraction></span> million. The
Company expects to recognize <span id="xdx_90E_ecustom--RevenueRemainingPerformancesObligationPercentage_pid_dp_uPure_c20220501__20220731_zTXiNH9SEdVg" title="Revenue remaining performance obligation, percentage"><ix:nonFraction name="OPTT:RevenueRemainingPerformancesObligationPercentage" contextRef="From2022-05-01to2022-07-31" format="ixt:numdotdecimal" decimals="INF" scale="-2" unitRef="Pure">100</ix:nonFraction></span>%, or $<span id="xdx_907_eus-gaap--RevenueRemainingPerformanceObligation_iI_pn5n6_c20220731_zZI2Z4Rjj0u" title="Revenue remaining performance obligation"><ix:nonFraction name="us-gaap:RevenueRemainingPerformanceObligation" contextRef="AsOf2022-07-31" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">0.3</ix:nonFraction></span> million, of the remaining performance obligations as revenue over the next twelve months.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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&#174;&#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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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 operating leases.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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 Statement of Operations.</span></p>

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

</ix:nonNumeric><ix:nonNumeric contextRef="From2022-05-01to2022-07-31" escape="true" name="us-gaap:EarningsPerSharePolicyTextBlock"><p id="xdx_84F_eus-gaap--EarningsPerSharePolicyTextBlock_znJF9QQGkLy5" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>(g)
<span id="xdx_866_zf9WVT2MM7E9">Net Loss per Common Share</span></i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Basic
and diluted net loss per 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 period. 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 the basic earnings per share number. Due
to the Company&#8217;s net losses, potentially dilutive securities, consisting of options to purchase shares of common stock, potential
exercises of warrants on common stock and unvested restricted stock issued to employees and non-employee directors, were excluded from
the diluted loss per share calculation due to their anti-dilutive effect.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">In
computing diluted net loss per share on the Consolidated Statement of Operations, potential exercises of warrants on 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_pid_c20220501__20220731_zlWXvMhyVAb1" title="Antidilutive securities earnings per share"><ix:nonFraction name="us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount" contextRef="From2022-05-01to2022-07-31" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">6,378,218</ix:nonFraction></span>
and <span id="xdx_90C_eus-gaap--AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_pid_c20210501__20210731_zG7Kn0DuRnTa"><ix:nonFraction name="us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount" contextRef="From2021-05-012021-07-31" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">5,243,647</ix:nonFraction></span> for the three months ended July 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

</ix:nonNumeric><ix:nonNumeric contextRef="From2022-05-01to2022-07-31" escape="true" name="us-gaap:NewAccountingPronouncementsPolicyPolicyTextBlock"><p id="xdx_84A_eus-gaap--NewAccountingPronouncementsPolicyPolicyTextBlock_zLTdh0sXipBf" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>(h)
<span id="xdx_861_zCViT2nSy448">Recently Issued Accounting Standards</span></i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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 the adoption of ASU 2016-13 will have on its consolidated financial statements.</span></p>

</ix:nonNumeric><p id="xdx_852_zPAI04rnbet5" 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">&#160;</span></p>


<ix:exclude><!-- Field: Page; Sequence: 13; Value: 2 -->
    <div style="border-bottom: Black 1.5pt solid; margin-top: 0pt; 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 -->13<!-- Field: /Sequence --></td></tr></table></div>
    <div style="break-before: page; margin-top: 6pt; margin-bottom: 0pt"><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 Content</a></td></tr></table></div>
    <!-- Field: /Page --></ix:exclude>

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

</ix:nonNumeric><ix:nonNumeric contextRef="From2022-05-01to2022-07-31" escape="true" name="OPTT:AccountReceivableContractAssetsAndContractLiabilitiesTextBlock"><p id="xdx_809_ecustom--AccountReceivableContractAssetsAndContractLiabilitiesTextBlock_zyNJuQPXHy37" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(3)
<span id="xdx_825_zkZQhiADfjKi">Account Receivable, Contract Assets and Contract Liabilities</span></b></span></p>

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

<ix:nonNumeric contextRef="From2022-05-01to2022-07-31" escape="true" name="OPTT:ScheduleOfAccountsReceivableContractAssetsAndContractLiabilitiesTableTextBlock"><p id="xdx_897_ecustom--ScheduleOfAccountsReceivableContractAssetsAndContractLiabilitiesTableTextBlock_zShJTKBeI9bd" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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, contract assets and contract liabilities from
contracts with customers:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_8B9_zrUmZ0Lcunb2" 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="display: none; vertical-align: bottom; background-color: White">
    <td style="text-align: left">&#160;</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td id="xdx_497_20220731_z5ZaDyACGXWb" style="text-align: right">&#160;</td><td style="text-align: left">&#160;</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td id="xdx_49F_20220430_zdDRSoeKIsag" style="text-align: right">&#160;</td><td style="text-align: left">&#160;</td></tr>
<tr style="vertical-align: bottom">
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</ix:nonNumeric><p id="xdx_8AE_zV58CCurFZo5" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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 conditional on completing additional
tasks or services for a performance obligation. The increase in contract assets is primarily a result of services performed relating
to MAR projects for which revenue was recognized but not billed during the three months ended July 31, 2022.</span></p>

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

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changes in the contract assets balances during the period were as follows:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_8B0_zpqBHf41XgX6" style="display: none">Schedule of Significant Changes in Contract assets and Contract Liabilities</span></span></p>

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<tr style="vertical-align: bottom">
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    <td style="text-align: left; padding-bottom: 2.5pt">Net change in contract assets</td><td style="padding-bottom: 2.5pt">&#160;</td>
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<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">&#160;</span></p>


<ix:exclude><!-- Field: Page; Sequence: 14; Value: 2 -->
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    <div style="break-before: page; margin-top: 6pt; margin-bottom: 0pt"><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 Content</a></td></tr></table></div>
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<p style="font: 10pt Times New Roman, Times, Serif; text-align: center; margin-top: 0pt; margin-bottom: 0pt"><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-top: 0pt; margin-bottom: 0pt; margin-left: 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Contract
Liabilities</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Contract
liabilities consist of amounts invoiced to customers in excess of revenue recognized. The decrease in contract liabilities is primarily
due to payment for MAR projects during the three months ended July 31, 2022 for which we have not recognized revenue.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Significant
changes in the contract liabilities balances during the period are as follows:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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="display: none; vertical-align: bottom; background-color: White">
    <td style="text-align: left; padding-bottom: 1.5pt">&#160;</td><td style="padding-bottom: 1.5pt">&#160;</td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left">&#160;</td><td id="xdx_493_20220501__20220731_zKRA53S5Vu71" style="border-bottom: Black 1.5pt solid; text-align: right">&#160;</td><td style="padding-bottom: 1.5pt; text-align: left">&#160;</td></tr>
<tr style="vertical-align: bottom">
    <td>&#160;</td><td style="font-weight: bold; padding-bottom: 1.5pt">&#160;</td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center">Three months ended <br />
July 31, 2022</td><td style="padding-bottom: 1.5pt; font-weight: bold">&#160;</td></tr>
  <tr style="vertical-align: bottom">
    <td>&#160;</td><td>&#160;</td>
    <td colspan="2" style="text-align: center">(in thousands)</td><td>&#160;</td></tr>
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    <td>&#160;</td><td>&#160;</td>
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    <td style="width: 78%; text-align: left">Revenue recognized that was included in the contract liabilities balance as of the beginning of the period</td><td style="width: 2%">&#160;</td>
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    <td style="text-align: left; padding-bottom: 2.5pt">Net change in contract liabilities</td><td style="padding-bottom: 2.5pt">&#160;</td>
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</ix:nonNumeric><p id="xdx_8A8_zPTRiSWbKBvi" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

</ix:nonNumeric><ix:nonNumeric contextRef="From2022-05-01to2022-07-31" escape="true" name="us-gaap:InventoryDisclosureTextBlock"><p id="xdx_804_eus-gaap--InventoryDisclosureTextBlock_z0YtUOzOSBy4" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(4)
<span id="xdx_822_zW9Kh4f7mV7h">Inventory</span></b></span></p>

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

<ix:nonNumeric contextRef="From2022-05-01to2022-07-31" escape="true" name="us-gaap:ScheduleOfInventoryCurrentTableTextBlock"><p id="xdx_899_eus-gaap--ScheduleOfInventoryCurrentTableTextBlock_zQIsDWhTKvGc" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company holds inventory related to the production of its WAM-V&#174; and PowerBuoy&#174; products.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span id="xdx_8B1_zOqubA4p26kb" style="display: none">Schedule of Inventory</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="display: none; vertical-align: bottom; background-color: White">
    <td style="text-align: left; padding-bottom: 1.5pt">&#160;</td><td style="padding-bottom: 1.5pt">&#160;</td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left">&#160;</td><td id="xdx_492_20220731_z78Mo00wa70b" style="border-bottom: Black 1.5pt solid; text-align: right">&#160;</td><td style="padding-bottom: 1.5pt; text-align: left">&#160;</td><td style="padding-bottom: 1.5pt">&#160;</td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left">&#160;</td><td id="xdx_49C_20220430_zHWZD0U8YmHh" style="border-bottom: Black 1.5pt solid; text-align: right">&#160;</td><td style="padding-bottom: 1.5pt; text-align: left">&#160;</td></tr>
<tr style="vertical-align: bottom">
    <td>&#160;</td><td style="font-weight: bold; padding-bottom: 1.5pt">&#160;</td>
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    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center">April 30, 2022</td><td style="padding-bottom: 1.5pt; font-weight: bold">&#160;</td></tr>
  <tr style="vertical-align: bottom">
    <td>&#160;</td><td>&#160;</td>
    <td colspan="6" style="text-align: center">(in thousands)</td><td>&#160;</td></tr>
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    <td style="width: 60%; text-align: left">Raw Materials</td><td style="width: 2%">&#160;</td>
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  <tr id="xdx_403_eus-gaap--InventoryWorkInProcess_iI_pn3n3_zCyFzgWRc2o4" style="vertical-align: bottom; background-color: White">
    <td style="text-align: left; padding-bottom: 1.5pt">Work in Process</td><td style="padding-bottom: 1.5pt">&#160;</td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left">&#160;</td><td style="border-bottom: Black 1.5pt solid; text-align: right"><ix:nonFraction name="us-gaap:InventoryWorkInProcess" contextRef="AsOf2022-07-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">245</ix:nonFraction></td><td style="padding-bottom: 1.5pt; text-align: left">&#160;</td><td style="padding-bottom: 1.5pt">&#160;</td>
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  <tr id="xdx_400_eus-gaap--InventoryNet_iI_pn3n3_zs9qmpRx1Alj" style="vertical-align: bottom; background-color: rgb(204,238,255)">
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    <td style="border-bottom: Black 2.5pt double; text-align: left">$</td><td style="border-bottom: Black 2.5pt double; text-align: right"><ix:nonFraction name="us-gaap:InventoryNet" contextRef="AsOf2022-07-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">588</ix:nonFraction></td><td style="padding-bottom: 2.5pt; text-align: left">&#160;</td><td style="padding-bottom: 2.5pt">&#160;</td>
    <td style="border-bottom: Black 2.5pt double; text-align: left">$</td><td style="border-bottom: Black 2.5pt double; text-align: right"><ix:nonFraction name="us-gaap:InventoryNet" contextRef="AsOf2022-04-30" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">442</ix:nonFraction></td><td style="padding-bottom: 2.5pt; text-align: left">&#160;</td></tr>
  </table>

</ix:nonNumeric><p id="xdx_8A5_zY10rLRcNe48" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

</ix:nonNumeric><ix:nonNumeric contextRef="From2022-05-01to2022-07-31" escape="true" name="us-gaap:OtherCurrentAssetsTextBlock"><p id="xdx_801_eus-gaap--OtherCurrentAssetsTextBlock_zbO8TevmB3f8" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(5)
<span id="xdx_822_zwei4eI66xs5">Other Current Assets</span></b></span></p>

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

<ix:nonNumeric contextRef="From2022-05-01to2022-07-31" escape="true" name="us-gaap:ScheduleOfOtherCurrentAssetsTableTextBlock"><p id="xdx_89C_eus-gaap--ScheduleOfOtherCurrentAssetsTableTextBlock_z4UEzqgKoUqh" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Other
current assets consisted of the following at July 31, 2022 and April 30, 2022:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span id="xdx_8B8_ztn9j7Q0lks1" style="display: none">Schedule of Other Current Assets</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="display: none; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left">&#160;</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td id="xdx_493_20220731_zdzPESDBkpG5" style="text-align: right">&#160;</td><td style="text-align: left">&#160;</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td id="xdx_49C_20220430_zj0CFcmg5lS6" style="text-align: right">&#160;</td><td style="text-align: left">&#160;</td></tr>
<tr style="vertical-align: bottom">
    <td>&#160;</td><td style="font-weight: bold; padding-bottom: 1.5pt">&#160;</td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center">July 31, 2022</td><td style="padding-bottom: 1.5pt; font-weight: bold">&#160;</td><td style="font-weight: bold; padding-bottom: 1.5pt">&#160;</td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center">April 30, 2022</td><td style="padding-bottom: 1.5pt; font-weight: bold">&#160;</td></tr>
  <tr style="vertical-align: bottom">
    <td>&#160;</td><td>&#160;</td>
    <td colspan="6" style="text-align: center">(in thousands)</td><td>&#160;</td></tr>
  <tr id="xdx_407_eus-gaap--PrepaidInsurance_iI_pn3n3_maOACz300_zDrVvpRWbECk" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="width: 60%; text-align: left">Prepaid insurance</td><td style="width: 2%">&#160;</td>
    <td style="width: 1%; text-align: left">$</td><td style="width: 16%; text-align: right"><ix:nonFraction name="us-gaap:PrepaidInsurance" contextRef="AsOf2022-07-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">97</ix:nonFraction></td><td style="width: 1%; text-align: left">&#160;</td><td style="width: 2%">&#160;</td>
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  <tr id="xdx_40A_ecustom--PrepaidSoftwareAndLicenses_pn3n3_maOACz300_z9sSDuFzQABf" style="vertical-align: bottom; background-color: White">
    <td style="text-align: left">Prepaid software &amp; licenses</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td style="text-align: right"><ix:nonFraction name="OPTT:PrepaidSoftwareAndLicenses" contextRef="AsOf2022-07-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">101</ix:nonFraction></td><td style="text-align: left">&#160;</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td style="text-align: right"><ix:nonFraction name="OPTT:PrepaidSoftwareAndLicenses" contextRef="AsOf2022-04-30" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">127</ix:nonFraction></td><td style="text-align: left">&#160;</td></tr>
  <tr id="xdx_40B_ecustom--PrepaidSalesAndMarketing_pn3n3_maOACz300_zTrhvl8U9eHi" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left">Prepaid sales &amp; marketing</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td style="text-align: right"><ix:nonFraction name="OPTT:PrepaidSalesAndMarketing" contextRef="AsOf2022-07-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">91</ix:nonFraction></td><td style="text-align: left">&#160;</td><td>&#160;</td>
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    <td style="text-align: left">Other receivables</td><td>&#160;</td>
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    <td style="text-align: left; padding-bottom: 1.5pt">Prepaid expenses- other</td><td style="padding-bottom: 1.5pt">&#160;</td>
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    <td style="border-bottom: Black 1.5pt solid; text-align: left">&#160;</td><td style="border-bottom: Black 1.5pt solid; text-align: right"><ix:nonFraction name="us-gaap:OtherPrepaidExpenseCurrent" contextRef="AsOf2022-04-30" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">84</ix:nonFraction></td><td style="padding-bottom: 1.5pt; text-align: left">&#160;</td></tr>
  <tr id="xdx_40C_eus-gaap--OtherAssetsCurrent_iTI_pn3n3_mtOACz300_zYQ1rpN21yAe" style="vertical-align: bottom; background-color: White">
    <td style="padding-bottom: 2.5pt"><span style="display: none; font-family: Times New Roman, Times, Serif; font-size: 10pt">Total other current assets</span></td><td style="padding-bottom: 2.5pt">&#160;</td>
    <td style="border-bottom: Black 2.5pt double; text-align: left">$</td><td style="border-bottom: Black 2.5pt double; text-align: right"><ix:nonFraction name="us-gaap:OtherAssetsCurrent" contextRef="AsOf2022-07-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">480</ix:nonFraction></td><td style="padding-bottom: 2.5pt; text-align: left">&#160;</td><td style="padding-bottom: 2.5pt">&#160;</td>
    <td style="border-bottom: Black 2.5pt double; text-align: left">$</td><td style="border-bottom: Black 2.5pt double; text-align: right"><ix:nonFraction name="us-gaap:OtherAssetsCurrent" contextRef="AsOf2022-04-30" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">467</ix:nonFraction></td><td style="padding-bottom: 2.5pt; text-align: left">&#160;</td></tr>
  </table>

</ix:nonNumeric><p id="xdx_8A1_z2a6QvC7IKoh" style="font: 10pt Times New Roman, Times, Serif; text-align: center; margin-top: 0pt; margin-bottom: 0pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>


<ix:exclude><!-- Field: Page; Sequence: 15; Value: 2 -->
    <div style="border-bottom: Black 1.5pt solid; margin-top: 0pt; 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; margin-bottom: 0pt"><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 Content</a></td></tr></table></div>
    <!-- Field: /Page --></ix:exclude>

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

</ix:nonNumeric><ix:nonNumeric contextRef="From2022-05-01to2022-07-31" escape="true" name="us-gaap:PropertyPlantAndEquipmentDisclosureTextBlock"><p id="xdx_803_eus-gaap--PropertyPlantAndEquipmentDisclosureTextBlock_zOyb4TTPICj1" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(6)
<span id="xdx_820_z8r0xGu0VFWb">Property and Equipment, net</span></b></span></p>

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

<ix:nonNumeric contextRef="From2022-05-01to2022-07-31" escape="true" name="us-gaap:PropertyPlantAndEquipmentTextBlock"><p id="xdx_894_eus-gaap--PropertyPlantAndEquipmentTextBlock_zxlhGehTRLG1" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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 July 31, 2022 and April 30, 2022 consisted of the following:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span id="xdx_8BB_zJcUP3T9ROFf" style="display: none">Schedule of Components of Property and Equipment</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="display: none; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left">&#160;</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td id="xdx_495_20220731_zucZSzWzrs26" style="text-align: right">&#160;</td><td style="text-align: left">&#160;</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td id="xdx_498_20220430_zjSo9MLnuozb" style="text-align: right">&#160;</td><td style="text-align: left">&#160;</td></tr>
<tr style="vertical-align: bottom">
    <td>&#160;</td><td style="font-weight: bold; padding-bottom: 1.5pt">&#160;</td>
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  <tr style="vertical-align: bottom">
    <td>&#160;</td><td>&#160;</td>
    <td colspan="6" style="text-align: center">(in thousands)</td><td>&#160;</td></tr>
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    <td style="width: 60%">Equipment</td><td style="width: 2%">&#160;</td>
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  <tr id="xdx_402_eus-gaap--PropertyPlantAndEquipmentGross_iI_pn3n3_hus-gaap--PropertyPlantAndEquipmentByTypeAxis__custom--ComputerEquipmentAndSoftwareMember_zYF0b9ahphlg" style="vertical-align: bottom; background-color: White">
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  <tr id="xdx_404_eus-gaap--PropertyPlantAndEquipmentGross_iI_pn3n3_hus-gaap--PropertyPlantAndEquipmentByTypeAxis__us-gaap--ConstructionInProgressMember_zuJv4wPFuIka" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left; padding-bottom: 1.5pt">Construction in process</td><td style="padding-bottom: 1.5pt">&#160;</td>
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    <td><span style="display: none; font-family: Times New Roman, Times, Serif; font-size: 10pt">Property and equipment, gross</span></td><td>&#160;</td>
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  <tr id="xdx_401_eus-gaap--AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_iNI_pn3n3_di_msPPAENzI8F_z5z154W8fi1l" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left; padding-bottom: 1.5pt">Less: accumulated depreciation</td><td style="padding-bottom: 1.5pt">&#160;</td>
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  <tr id="xdx_406_eus-gaap--PropertyPlantAndEquipmentNet_iTI_pn3n3_mtPPAENzI8F_z1i3CgC1Y2fa" style="vertical-align: bottom; background-color: White">
    <td style="padding-bottom: 2.5pt"><span style="display: none; font-family: Times New Roman, Times, Serif; font-size: 10pt">Property and equipment,
    net</span></td><td style="padding-bottom: 2.5pt">&#160;</td>
    <td style="border-bottom: Black 2.5pt double; text-align: left">$</td><td style="border-bottom: Black 2.5pt double; text-align: right"><ix:nonFraction name="us-gaap:PropertyPlantAndEquipmentNet" contextRef="AsOf2022-07-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">458</ix:nonFraction></td><td style="padding-bottom: 2.5pt; text-align: left">&#160;</td><td style="padding-bottom: 2.5pt">&#160;</td>
    <td style="border-bottom: Black 2.5pt double; text-align: left">$</td><td style="border-bottom: Black 2.5pt double; text-align: right"><ix:nonFraction name="us-gaap:PropertyPlantAndEquipmentNet" contextRef="AsOf2022-04-30" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">445</ix:nonFraction></td><td style="padding-bottom: 2.5pt; text-align: left">&#160;</td></tr>
  </table>

</ix:nonNumeric><p id="xdx_8A9_z01grGmxzCuk" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Depreciation
expense was approximately $<span id="xdx_901_eus-gaap--Depreciation_c20220501__20220731_zNPtLqpVt4R1" title="Depreciation expense"><ix:nonFraction name="us-gaap:Depreciation" contextRef="From2022-05-01to2022-07-31" format="ixt:numdotdecimal" decimals="0" unitRef="USD">43,000</ix:nonFraction></span> and $<span id="xdx_90A_eus-gaap--Depreciation_c20210501__20210731_z3eoV8Xa39Yi" title="Depreciation expense"><ix:nonFraction name="us-gaap:Depreciation" contextRef="From2021-05-012021-07-31" format="ixt:numdotdecimal" decimals="0" unitRef="USD">40,000</ix:nonFraction></span> for the three-month periods ended July 31, 2022 and 2021, respectively.</span></p>

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

</ix:nonNumeric><ix:nonNumeric contextRef="From2022-05-01to2022-07-31" escape="true" name="us-gaap:LesseeOperatingLeasesTextBlock"><p id="xdx_805_eus-gaap--LesseeOperatingLeasesTextBlock_z7KGcPhmCYbh" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(7)
<span id="xdx_828_ziq1h4P1HFS8">Leases</span></b></span></p>

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

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Right-of-use
asset and operating lease liabilities are recognized based on the present value of future 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. The Company only has operating leases for office
facilities and warehouse space. 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.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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_905_eus-gaap--LesseeOperatingLeaseOptionToExtend_c20220501__20220731__srt--StatementGeographicalAxis__custom--MonroeTownshipMember_z56SaAqPZNh3" title="Lessee, operating lease, option to extend"> <ix:nonNumeric contextRef="From2022-05-012022-07-31_custom_MonroeTownshipMember" name="us-gaap:LesseeOperatingLeaseOptionToExtend">The
initial lease term is for <span id="xdx_903_eus-gaap--LesseeOperatingLeaseTermOfContract_iI_dc_c20220731__srt--StatementGeographicalAxis__custom--MonroeTownshipMember_zdFmyXRvxZ4h" title="Lessee, operating lease, term of contract"><ix:nonNumeric contextRef="AsOf2022-07-31_custom_MonroeTownshipMember" format="ixt-sec:durwordsen" name="us-gaap:LesseeOperatingLeaseTermOfContract">seven years</ix:nonNumeric></span> which is set to expire 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company also has a lease located in Houston, Texas that was acquired as part of the 3Dent acquisition that is used as office space.
The lease term is for <span id="xdx_907_eus-gaap--LesseeOperatingLeaseTermOfContract_iI_dtY_c20220731__us-gaap--BusinessAcquisitionAxis__custom--ThreeDentAcquisitionMember_zTREMG54V215" title="Lessee, operating lease, term of contract"><ix:nonNumeric contextRef="AsOf2022-07-31_custom_ThreeDentAcquisitionMember" format="ixt-sec:duryear" name="us-gaap:LesseeOperatingLeaseTermOfContract">3</ix:nonNumeric></span>
years and is set to <span id="xdx_902_eus-gaap--LesseeOperatingLeaseOptionToExtend_c20220501__20220731__us-gaap--BusinessAcquisitionAxis__custom--ThreeDentAcquisitionMember_zAMcsUwkpLXj" title="Lessee, operating lease, option to extend"><ix:nonNumeric contextRef="From2022-05-012022-07-31_custom_ThreeDentAcquisitionMember" name="us-gaap:LesseeOperatingLeaseOptionToExtend">expire
in January of 2023</ix:nonNumeric></span>. The lease is classified as an operating lease and included in the right-of-use assets and lease
liabilities- current on the Company&#8217;s Consolidated Balance Sheets.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company also has a lease with the University of California Berkeley in Richmond, California that was acquired as part of the MAR acquisition.
The lease expired on <span id="xdx_906_eus-gaap--LeaseExpirationDate1_dd_c20220501__20220731__us-gaap--BusinessAcquisitionAxis__custom--ThreeDentAcquisitionMember_z8QTzY16fAGf" title="Lease expiration date"><ix:nonNumeric contextRef="From2022-05-012022-07-31_custom_ThreeDentAcquisitionMember" format="ixt:datemonthdayyearen" name="us-gaap:LeaseExpirationDate1">June 30, 2022</ix:nonNumeric></span> and the Company is in discussions to renew this lease. As the lease expired prior to renewal, it has
become a month-to-month lease in accordance with the agreement. 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 not recognized as a right-of-use asset.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0; text-align: justify">The operating
lease cash flow payments for the three months ended July 31, 2022 and 2021 were $<span id="xdx_90E_eus-gaap--OperatingLeasePayments_c20220501__20220731_ztMWfpOR0Evd"><ix:nonFraction name="us-gaap:OperatingLeasePayments" contextRef="From2022-05-01to2022-07-31" format="ixt:numdotdecimal" decimals="0" unitRef="USD">100,000</ix:nonFraction>
</span>and $<span id="xdx_90B_eus-gaap--OperatingLeasePayments_c20210501__20210731_zf9vy5cV9hwg"><ix:nonFraction name="us-gaap:OperatingLeasePayments" contextRef="From2021-05-012021-07-31" format="ixt:numdotdecimal" decimals="0" unitRef="USD">102,000</ix:nonFraction></span>, respectively.</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">&#160;</span></p>


<ix:exclude><!-- Field: Page; Sequence: 16; Value: 2 -->
    <div style="border-bottom: Black 1.5pt solid; margin-top: 0pt; 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; margin-bottom: 0pt"><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 Content</a></td></tr></table></div>
    <!-- Field: /Page --></ix:exclude>

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

<ix:nonNumeric contextRef="From2022-05-01to2022-07-31" escape="true" name="us-gaap:LeaseCostTableTextBlock"><p id="xdx_89B_eus-gaap--LeaseCostTableTextBlock_zT71OthNK1j3" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
components of lease expense in the Consolidated Statement of Operations for the three months ended July 31, 2022 and 2021 were as follows:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_8BD_znWq8iTPtaB8" 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%">
  <tr style="display: none; vertical-align: bottom; background-color: White">
    <td style="text-align: left; padding-bottom: 1.5pt">&#160;</td><td style="padding-bottom: 1.5pt">&#160;</td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left">&#160;</td><td id="xdx_49C_20220501__20220731_zCcPtfLOLTn7" style="border-bottom: Black 1.5pt solid; text-align: right">&#160;</td><td style="padding-bottom: 1.5pt; text-align: left">&#160;</td><td style="padding-bottom: 1.5pt">&#160;</td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left">&#160;</td><td id="xdx_495_20210501__20210731_zq9ERG6xerYd" style="border-bottom: Black 1.5pt solid; text-align: right">&#160;</td><td style="padding-bottom: 1.5pt; text-align: left">&#160;</td></tr>
<tr style="vertical-align: bottom">
    <td>&#160;</td><td style="font-weight: bold; padding-bottom: 1.5pt">&#160;</td>
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</ix:nonNumeric><p id="xdx_8AC_zmizJSU8e0Db" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<ix:nonNumeric contextRef="From2022-05-01to2022-07-31" escape="true" name="OPTT:ScheduleOfRightofUseAssetsAndLeaseLiabilitiesTableTextBlock"><p id="xdx_89D_ecustom--ScheduleOfRightofUseAssetsAndLeaseLiabilitiesTableTextBlock_z1ouH9rNEz5i" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Information
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<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_8B7_zSm0ZGkHyu48" 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="display: none; vertical-align: bottom; background-color: White">
    <td style="padding-left: 10pt; text-align: left">&#160;</td><td>&#160;</td>
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<tr style="vertical-align: bottom">
    <td>&#160;</td><td style="font-weight: bold; padding-bottom: 1.5pt">&#160;</td>
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  <tr style="vertical-align: bottom">
    <td>&#160;</td><td>&#160;</td>
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  <tr style="vertical-align: bottom">
    <td>&#160;</td><td>&#160;</td>
    <td colspan="2" style="text-align: right">&#160;</td><td>&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-decoration: underline; text-align: left">Operating lease:</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 id="xdx_40C_eus-gaap--OperatingLeaseRightOfUseAsset_iI_pn3n3" style="vertical-align: bottom; background-color: White">
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  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <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 id="xdx_40F_eus-gaap--OperatingLeaseLiabilityCurrent_iI_pn3n3_maOLLzIil_zXIAAQEHCHte" style="vertical-align: bottom; background-color: White">
    <td style="padding-left: 10pt; text-align: left">Right-of-use liability- current</td><td>&#160;</td>
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  <tr id="xdx_402_eus-gaap--OperatingLeaseLiability_iTI_pn3n3_mtOLLzIil_zw9I5Mw2Jsnh" style="vertical-align: bottom; background-color: White">
    <td style="text-align: left; padding-bottom: 2.5pt">Total lease liability</td><td style="padding-bottom: 2.5pt">&#160;</td>
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  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <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: White">
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  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left">Weighted average discount rate- operating leases</td><td>&#160;</td>
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  </table>

</ix:nonNumeric><p id="xdx_8AF_z5zPd2xeynj9" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<ix:nonNumeric contextRef="From2022-05-01to2022-07-31" escape="true" name="us-gaap:LesseeOperatingLeaseLiabilityMaturityTableTextBlock"><p id="xdx_89F_eus-gaap--LesseeOperatingLeaseLiabilityMaturityTableTextBlock_z5pFD9dQYgbi" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_8B9_zmD5Qf1s51Ua" 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="display: none; vertical-align: bottom; background-color: White">
    <td style="text-align: left">&#160;</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td id="xdx_493_20220731_zVrudzp6PSl5" style="text-align: right">&#160;</td><td style="text-align: left">&#160;</td></tr>
<tr style="vertical-align: bottom">
    <td style="text-align: left">&#160;</td><td style="font-weight: bold; padding-bottom: 1.5pt">&#160;</td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center">July 31, 2022</td><td style="padding-bottom: 1.5pt; font-weight: bold">&#160;</td></tr>
  <tr style="vertical-align: bottom">
    <td style="text-align: left">&#160;</td><td>&#160;</td>
    <td colspan="2" style="text-align: center">(in thousands)</td><td>&#160;</td></tr>
  <tr style="vertical-align: bottom">
    <td style="text-align: left">&#160;</td><td>&#160;</td>
    <td colspan="2" style="text-align: right">&#160;</td><td>&#160;</td></tr>
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    <td style="width: 78%; text-align: left">Remainder of fiscal year 2023</td><td style="width: 2%">&#160;</td>
    <td style="width: 1%; text-align: left">$</td><td style="width: 18%; text-align: right"><ix:nonFraction name="us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths" contextRef="AsOf2022-07-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">295</ix:nonFraction></td><td style="width: 1%; text-align: left">&#160;</td></tr>
  <tr id="xdx_401_eus-gaap--LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_iI_pn3n3_maLOLLPzbOq_ziYJm2x4JMMi" style="vertical-align: bottom; background-color: White">
    <td style="text-align: left">2024</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td style="text-align: right"><ix:nonFraction name="us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo" contextRef="AsOf2022-07-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">362</ix:nonFraction></td><td style="text-align: left">&#160;</td></tr>
  <tr id="xdx_403_eus-gaap--LesseeOperatingLeaseLiabilityPaymentsDueYearThree_iI_pn3n3_maLOLLPzbOq_zRPkEiCD2Deh" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left">2025</td><td>&#160;</td>
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  <tr id="xdx_40C_eus-gaap--LesseeOperatingLeaseLiabilityPaymentsDue_iTI_pn3n3_mtLOLLPzbOq_z07EFdaaN95f" style="vertical-align: bottom; background-color: White">
    <td style="text-align: left">Total future minimum lease payments</td><td>&#160;</td>
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    <td style="text-align: left; padding-bottom: 1.5pt">Less imputed interest</td><td style="padding-bottom: 1.5pt">&#160;</td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left">&#160;</td><td style="border-bottom: Black 1.5pt solid; text-align: right">(<ix:nonFraction name="us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount" contextRef="AsOf2022-07-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">67</ix:nonFraction></td><td style="padding-bottom: 1.5pt; text-align: left">)</td></tr>
  <tr id="xdx_401_eus-gaap--OperatingLeaseLiability_iI_pn3n3" style="vertical-align: bottom; background-color: White">
    <td style="text-align: left; padding-bottom: 2.5pt">Total</td><td style="padding-bottom: 2.5pt">&#160;</td>
    <td style="border-bottom: Black 2.5pt double; text-align: left">$</td><td style="border-bottom: Black 2.5pt double; text-align: right"><ix:nonFraction name="us-gaap:OperatingLeaseLiability" contextRef="AsOf2022-07-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">774</ix:nonFraction></td><td style="padding-bottom: 2.5pt; text-align: left">&#160;</td></tr>
  </table>
<!-- Field: Split-Segment; Name: 002 -->
<p style="font: 10pt Times New Roman, Times, Serif; text-align: center; margin-top: 0pt; margin-bottom: 0pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>


<ix:exclude><!-- Field: Page; Sequence: 17; Value: 2 -->
    <div style="border-bottom: Black 1.5pt solid; margin-top: 0pt; 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; margin-bottom: 0pt"><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 Content</a></td></tr></table></div>
    <!-- Field: /Page --></ix:exclude>

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

</ix:nonNumeric></ix:nonNumeric><ix:nonNumeric contextRef="From2022-05-01to2022-07-31" escape="true" name="us-gaap:AccountsPayableAndAccruedLiabilitiesDisclosureTextBlock"><p id="xdx_80D_eus-gaap--AccountsPayableAndAccruedLiabilitiesDisclosureTextBlock_zqB4L62067Nk" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(8)
<span id="xdx_823_zrv1PlAq6GTk">Accrued Expenses</span></b></span></p>

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

<ix:nonNumeric contextRef="From2022-05-01to2022-07-31" escape="true" name="us-gaap:ScheduleOfAccruedLiabilitiesTableTextBlock"><p id="xdx_893_eus-gaap--ScheduleOfAccruedLiabilitiesTableTextBlock_zN7qwdIhZfdk" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Accrued
expenses consisted of the following at July 31, 2022 and April 30, 2022:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;<span id="xdx_8B2_zN41mf7hFlB" 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%">
  <tr style="vertical-align: bottom">
    <td>&#160;</td><td style="font-weight: bold; padding-bottom: 1.5pt">&#160;</td>
    <td colspan="2" id="xdx_49D_20220731_zatzsPjeesRg" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center">July 31, 2022</td><td style="padding-bottom: 1.5pt; font-weight: bold">&#160;</td><td style="font-weight: bold; padding-bottom: 1.5pt">&#160;</td>
    <td colspan="2" id="xdx_490_20220430_z8v6QilMtOjf" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center">April 30, 2022</td><td style="padding-bottom: 1.5pt; font-weight: bold">&#160;</td></tr>
  <tr style="vertical-align: bottom">
    <td>&#160;</td><td>&#160;</td>
    <td colspan="2" style="text-align: center">(in thousands)</td><td>&#160;</td><td>&#160;</td>
    <td colspan="2">&#160;</td><td>&#160;</td></tr>
  <tr id="xdx_40C_eus-gaap--ConstructionPayableCurrent_iI_maCzsTG_zrNzSSbGojxk" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="width: 60%; text-align: left">Project costs</td><td style="width: 2%">&#160;</td>
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    <td style="width: 1%; text-align: left">$</td><td style="width: 16%; text-align: right"><ix:nonFraction name="us-gaap:ConstructionPayableCurrent" contextRef="AsOf2022-04-30" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">59</ix:nonFraction></td><td style="width: 1%; text-align: left">&#160;</td></tr>
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    <td style="text-align: left">Contract loss reserve</td><td>&#160;</td>
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  <tr id="xdx_40B_eus-gaap--OtherEmployeeRelatedLiabilitiesCurrent_iI_maCzsTG_zeq5OlRfPSd8" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left">Employee incentive payments</td><td>&#160;</td>
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    <td style="text-align: left">Accrued salary and benefits</td><td>&#160;</td>
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    <td style="text-align: left">Legal and accounting fees</td><td>&#160;</td>
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  <tr id="xdx_40E_eus-gaap--OtherAccruedLiabilitiesCurrent_iI_maCzsTG_zgERaGugdVLe" style="vertical-align: bottom; background-color: White">
    <td style="padding-bottom: 1.5pt">Other</td><td style="padding-bottom: 1.5pt">&#160;</td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left">&#160;</td><td style="border-bottom: Black 1.5pt solid; text-align: right"><ix:nonFraction name="us-gaap:OtherAccruedLiabilitiesCurrent" contextRef="AsOf2022-07-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">145</ix:nonFraction></td><td style="padding-bottom: 1.5pt; text-align: left">&#160;</td><td style="padding-bottom: 1.5pt">&#160;</td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left">&#160;</td><td style="border-bottom: Black 1.5pt solid; text-align: right"><ix:nonFraction name="us-gaap:OtherAccruedLiabilitiesCurrent" contextRef="AsOf2022-04-30" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">134</ix:nonFraction></td><td style="padding-bottom: 1.5pt; text-align: left">&#160;</td></tr>
  <tr id="xdx_40C_eus-gaap--AccruedLiabilitiesCurrent_iTI_mtCzsTG_zpnVl2VqddKd" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="padding-bottom: 2.5pt"><span style="display: none; font-family: Times New Roman, Times, Serif; font-size: 10pt">Accrued expenses total</span></td><td style="padding-bottom: 2.5pt">&#160;</td>
    <td style="border-bottom: Black 2.5pt double; text-align: left">$</td><td style="border-bottom: Black 2.5pt double; text-align: right"><ix:nonFraction name="us-gaap:AccruedLiabilitiesCurrent" contextRef="AsOf2022-07-31" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">1,090</ix:nonFraction></td><td style="padding-bottom: 2.5pt; text-align: left">&#160;</td><td style="padding-bottom: 2.5pt">&#160;</td>
    <td style="border-bottom: Black 2.5pt double; text-align: left">$</td><td style="border-bottom: Black 2.5pt double; text-align: right"><ix:nonFraction name="us-gaap:AccruedLiabilitiesCurrent" contextRef="AsOf2022-04-30" format="ixt:numdotdecimal" decimals="-3" scale="3" unitRef="USD">877</ix:nonFraction></td><td style="padding-bottom: 2.5pt; text-align: left">&#160;</td></tr>
  </table>

</ix:nonNumeric><p id="xdx_8A0_zcr7cDBVl7xi" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

</ix:nonNumeric><ix:nonNumeric contextRef="From2022-05-01to2022-07-31" escape="true" name="OPTT:WarrantDisclosureTextBlock"><p id="xdx_802_ecustom--WarrantDisclosureTextBlock_z2Q9PpYFa0b3" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(9)
<span id="xdx_82F_zTlbHCi1kbMf">Warrants</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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_90F_eus-gaap--SaleOfStockNumberOfSharesIssuedInTransaction_pid_c20190407__20190408_zl4XB9pV7eHe" 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_90B_eus-gaap--ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights_iI_pid_c20190408__us-gaap--StatementEquityComponentsAxis__custom--PreFundedWarrantsMember_z30hbdcIPzv" 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_908_eus-gaap--ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights_iI_pid_c20190408__us-gaap--StatementEquityComponentsAxis__custom--CommonWarrantsMember_z4m3hwjCUQQ8" 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 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_90D_eus-gaap--ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_iI_pid_c20190408__us-gaap--StatementEquityComponentsAxis__custom--PreFundedWarrantsMember_ztgidyQEIcS3"><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 July 31, 2022, all of the pre-funded warrants had been
exercised. The common stock warrants have an exercise price of $<span id="xdx_90D_eus-gaap--ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_iI_pid_c20190408__us-gaap--StatementEquityComponentsAxis__custom--CommonWarrantsMember_zUUNigMvMtph" 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_90F_eus-gaap--WarrantsAndRightsOutstandingTerm_iI_dc_c20190408__us-gaap--StatementEquityComponentsAxis__custom--CommonWarrantsMember_zPjOlQJRMGXk" 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 July
31, 2022, warrants to purchase <span id="xdx_908_eus-gaap--ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights_iI_pid_c20220731__us-gaap--StatementEquityComponentsAxis__custom--CommonWarrantsMember_zJMeP3b8xGzf"><ix:nonFraction name="us-gaap:ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights" contextRef="AsOf2022-07-31_custom_CommonWarrantsMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">732,500</ix:nonFraction></span> shares of the common stock had been exercised.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company accounts for warrants 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 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

</ix:nonNumeric><ix:nonNumeric contextRef="From2022-05-01to2022-07-31" escape="true" name="us-gaap:DebtDisclosureTextBlock"><p id="xdx_80D_eus-gaap--DebtDisclosureTextBlock_zVzxpQLxZ8Lk" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(10)
<span id="xdx_82C_zwYtnUH6cHQ">Paycheck Protection Program Loan</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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 $<span id="xdx_90A_eus-gaap--ProceedsFromLoanOriginations1_pp0p0_c20200501__20200503__us-gaap--TypeOfArrangementAxis__custom--PaycheckProtectionProgramMember_zzi6hZl16OZj" 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">891,000</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 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_903_ecustom--DebtForgivenessDescription_c20200501__20200503__us-gaap--TypeOfArrangementAxis__custom--PaycheckProtectionProgramMember_zEVvDWZWly45" 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_909_eus-gaap--DebtInstrumentInterestRateStatedPercentage_iI_pid_dp_c20200503__us-gaap--TypeOfArrangementAxis__custom--PaycheckProtectionProgramMember_zhFkAJg8IETa" 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 has now been fully forgiven. The Company recognized a gain
on forgiveness of PPP loan of approximately $<span id="xdx_90F_eus-gaap--RepaymentsOfLongTermDebt_pp0p0_c20210501__20220430__us-gaap--TypeOfArrangementAxis__custom--PaycheckProtectionProgramMember_zb2ahVqIwqwf" title="Repayments of long-term debt"><ix:nonFraction name="us-gaap:RepaymentsOfLongTermDebt" contextRef="From2021-05-012022-04-30_custom_PaycheckProtectionProgramMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">891,000</ix:nonFraction></span> during the three months ended July 31, 2021.</ix:nonNumeric></span></span></p>

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

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


<ix:exclude><!-- Field: Page; Sequence: 18; Value: 2 -->
    <div style="border-bottom: Black 1.5pt solid; margin-top: 0pt; 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; margin-bottom: 0pt"><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 Content</a></td></tr></table></div>
    <!-- Field: /Page --></ix:exclude>

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

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

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

</ix:nonNumeric><ix:nonNumeric contextRef="From2022-05-01to2022-07-31" escape="true" name="us-gaap:DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock"><p id="xdx_806_eus-gaap--DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_z3jmsE3bZLC8" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(11)
<span id="xdx_828_zprnbRfTQhBi">Share-Based Compensation</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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_906_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_iI_c20151231__us-gaap--PlanNameAxis__custom--TwoThousandAndFifteenOmnibusIncentivePlanMember_zT4pZ1nj1znl" 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 July 31, 2022, the Company had <span id="xdx_906_eus-gaap--CommonStockCapitalSharesReservedForFutureIssuance_iI_c20220731__us-gaap--PlanNameAxis__custom--TwoThousandAndFifteenOmnibusIncentivePlanMember__srt--TitleOfIndividualAxis__srt--ChiefExecutiveOfficerMember_zKexwLUIALGh" title="Capital shares reserved for future issuance"><ix:nonFraction name="us-gaap:CommonStockCapitalSharesReservedForFutureIssuance" contextRef="AsOf2022-07-31_custom_TwoThousandAndFifteenOmnibusIncentivePlanMember_srt_ChiefExecutiveOfficerMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">695,127</ix:nonFraction></span> shares available for future issuance under the
2015 Plan.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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_90B_eus-gaap--CommonStockCapitalSharesReservedForFutureIssuance_iI_c20180118__us-gaap--PlanNameAxis__custom--TwoThousandAndEighteenInducementPlanMember_zKNbJHhZO6gh" 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 employees of 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. On
February 9, 2022, the 2018 Inducement Plan was amended to increase the authorized shares by <span id="xdx_907_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_iI_pid_c20220208__us-gaap--PlanNameAxis__custom--TwoThousandAndEighteenInducementPlanMember_zhQpXUkUweo3" 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_90E_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_iI_pid_c20220209__us-gaap--PlanNameAxis__custom--TwoThousandAndEighteenInducementPlanMember_zXWXom2AxDO2" 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>.
As of July 31, 2022, there were <span id="xdx_90B_eus-gaap--CommonStockCapitalSharesReservedForFutureIssuance_iI_c20220731__us-gaap--PlanNameAxis__custom--TwoThousandAndEighteenInducementPlanMember_zY3BfNow1AL5" title="Capital shares reserved for future issuance"><ix:nonFraction name="us-gaap:CommonStockCapitalSharesReservedForFutureIssuance" contextRef="AsOf2022-07-31_custom_TwoThousandAndEighteenInducementPlanMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">211,487</ix:nonFraction></span>
shares available for grant under the 2018 Inducement Plan. The 2015 Plan and the 2018 Inducement Plan together comprise the &#8220;Stock Incentive Plans&#8221;.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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 commensurate with the expected life of the award. The expected
life (estimated period of time outstanding) of the stock options granted was 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 did not grant any stock options during the three
months ended July 31, 2022 and 2021.</span></p>

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

<ix:nonNumeric contextRef="From2022-05-01to2022-07-31" escape="true" name="us-gaap:ScheduleOfShareBasedCompensationActivityTableTextBlock"><p id="xdx_898_eus-gaap--ScheduleOfShareBasedCompensationActivityTableTextBlock_zXERJNdHJhBb" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;<span id="xdx_8B8_zazJOwN3zBXe" 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="vertical-align: bottom">
    <td style="text-align: left">&#160;</td><td style="padding-bottom: 1.5pt">&#160;</td>
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  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
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  <tr style="vertical-align: bottom; background-color: White">
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Granted</span></td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td id="xdx_98D_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_pid_c20220501__20220731_z8XSpMDYH7a1" title="Shares underlying options outstanding, granted" style="text-align: right"><span style="-sec-ix-hidden: xdx2ixbrl0787">&#8212;</span></td><td style="text-align: left">&#160;</td><td>&#160;</td>
    <td style="text-align: left">$</td><td id="xdx_98A_eus-gaap--ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_pid_c20220501__20220731_z3vfmFZPhLpf" title="Weighted Average Exercise Price, Granted" style="text-align: right"><span style="-sec-ix-hidden: xdx2ixbrl0789">&#8212;</span></td><td style="text-align: left">&#160;</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td style="text-align: right">&#160;</td><td style="text-align: left">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Exercised</span></td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td id="xdx_982_eus-gaap--StockIssuedDuringPeriodSharesStockOptionsExercised_iN_pid_di_c20220501__20220731_z6nBa1ZZjQjk" title="Shares Underlying Options Outstanding, Exercised" style="text-align: right"><span style="-sec-ix-hidden: xdx2ixbrl0791">&#8212;</span></td><td style="text-align: left"></td><td>&#160;</td>
    <td style="text-align: left">$</td><td id="xdx_98D_eus-gaap--ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_pid_c20220501__20220731_zQ5jD7AZKA45" title="Weighted Average Exercise Price, Exercised" style="text-align: right"><span style="-sec-ix-hidden: xdx2ixbrl0793">&#8212;</span></td><td style="text-align: left">&#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: White">
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    <td style="border-bottom: Black 1.5pt solid; text-align: left">&#160;</td><td id="xdx_984_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod_iN_pid_di_c20220501__20220731_z0HuIxu5h9u2" title="Shares Underlying Options Outstanding, Cancelled/forfeited" style="border-bottom: Black 1.5pt solid; text-align: right">(<ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod" contextRef="From2022-05-01to2022-07-31" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">37</ix:nonFraction></td><td style="padding-bottom: 1.5pt; text-align: left">)</td><td style="padding-bottom: 1.5pt">&#160;</td>
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    <td style="padding-bottom: 1.5pt; text-align: left">&#160;</td><td style="padding-bottom: 1.5pt; text-align: right">&#160;</td><td style="padding-bottom: 1.5pt; text-align: left">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
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  <tr style="vertical-align: bottom; background-color: White">
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  </table>

</ix:nonNumeric><p id="xdx_8AA_zWsymkxdRJo" 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">&#160;</span></p>


<ix:exclude><!-- Field: Page; Sequence: 19; Value: 2 -->
    <div style="border-bottom: Black 1.5pt solid; margin-top: 0pt; 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; margin-bottom: 0pt"><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 Content</a></td></tr></table></div>
    <!-- Field: /Page --></ix:exclude>

<p style="font: 10pt Times New Roman, Times, Serif; text-align: center; 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">As
of July 31, 2022, the total intrinsic value of outstanding and exercisable options was approximately <span id="xdx_90E_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_iI_pp0p0_do_c20220731__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zPo2NvFQPHz9" title="Intrinsic value of outstanding and exercisable options"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue" contextRef="AsOf2022-07-31_us-gaap_EmployeeStockOptionMember" format="ixt-sec:numwordsen" decimals="0" scale="0" unitRef="USD">zero</ix:nonFraction></span>. As of July 31, 2022, approximately
<span id="xdx_905_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares_iI_pid_c20220731__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zsK2op8nLJ8c" title="Options unvested"><ix:nonFraction name="us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares" contextRef="AsOf2022-07-31_us-gaap_EmployeeStockOptionMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">813,000</ix:nonFraction></span> options were unvested, which had an intrinsic value of <span id="xdx_90E_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_iI_pp0p0_do_c20220731__us-gaap--AwardTypeAxis__custom--EmployeeStockOptionOneMember_zB90Xy4P6Yad" 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_90B_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1_dtY_c20220501__20220731__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zfM3oBOF4i2d" title="Weighted average remaining contractual term"><ix:nonNumeric contextRef="From2022-05-012022-07-31_us-gaap_EmployeeStockOptionMember" format="ixt-sec:duryear" name="us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1">9.4</ix:nonNumeric></span> years. There
was approximately $<span id="xdx_90A_eus-gaap--AllocatedShareBasedCompensationExpense_c20220501__20220731__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zkvfaGzdEjl4" title="Share-based payment arrangement, expense"><ix:nonFraction name="us-gaap:AllocatedShareBasedCompensationExpense" contextRef="From2022-05-012022-07-31_us-gaap_EmployeeStockOptionMember" format="ixt:numdotdecimal" decimals="0" unitRef="USD">96,000</ix:nonFraction> </span>and $<span id="xdx_90A_eus-gaap--AllocatedShareBasedCompensationExpense_c20210501__20210731__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zXoztFpY7L4" title="Share-based payment arrangement, expense"><ix:nonFraction name="us-gaap:AllocatedShareBasedCompensationExpense" contextRef="From2021-05-012021-07-31_us-gaap_EmployeeStockOptionMember" format="ixt:numdotdecimal" decimals="0" unitRef="USD">110,000</ix:nonFraction></span> of total recognized compensation cost related to stock options during each of the three months
ended July 31, 2022 and 2021, respectively. As of July 31, 2022, there was approximately $<span id="xdx_902_eus-gaap--EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions_iI_pn5n6_c20220731__us-gaap--AwardTypeAxis__custom--NonVestedStockMember_z7WSfTJNGdN8" title="Unrecognized compensation cost related to non-vested stock"><ix:nonFraction name="us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions" contextRef="AsOf2022-07-31_custom_NonVestedStockMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">0.7</ix:nonFraction></span> million 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_901_eus-gaap--EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_dtY_c20220501__20220731__us-gaap--AwardTypeAxis__custom--NonVestedStockMember_zGjfvs2WUGSd" title="Share-based compensation of weighted-average period"><ix:nonNumeric contextRef="From2022-05-012022-07-31_custom_NonVestedStockMember" format="ixt-sec:duryear" name="us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1">2.3</ix:nonNumeric></span> years.</span></p>

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

<ix:nonNumeric contextRef="From2022-05-012022-07-31_custom_PerformanceStockOptionsMember" escape="true" name="us-gaap:ScheduleOfShareBasedCompensationActivityTableTextBlock"><p id="xdx_89D_eus-gaap--ScheduleOfShareBasedCompensationActivityTableTextBlock_hus-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zX3QvoeujmSl" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">A
summary of performance 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_8BB_zBu4oBuwBouc" 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="vertical-align: bottom">
    <td style="text-align: left">&#160;</td><td style="padding-bottom: 1.5pt">&#160;</td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Options </b></span></p></td><td style="padding-bottom: 1.5pt">&#160;</td><td style="padding-bottom: 1.5pt">&#160;</td>
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  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
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    <td style="width: 1%; text-align: left">$</td><td id="xdx_988_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_iS_pid_c20220501__20220731__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zlcNMioHQsB9" title="Weighted average exercise price, beginning balance" style="width: 14%; text-align: right"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice" contextRef="AsOf2022-04-30_custom_PerformanceStockOptionsMember" format="ixt:numdotdecimal" decimals="INF" unitRef="USDPShares">2.20</ix:nonFraction></td><td style="width: 1%; text-align: left">&#160;</td><td style="width: 2%">&#160;</td>
    <td style="width: 1%; text-align: left">&#160;</td><td style="width: 14%; text-align: right"><span id="xdx_90A_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_dtY_c20220501__20220731__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zpqMv7wyx0Hk" title="Weighted Average Remaining Contractual Term (In Years), Beginning"><ix:nonNumeric contextRef="From2022-05-012022-07-31_custom_PerformanceStockOptionsMember" format="ixt-sec:duryear" name="us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2">8.8</ix:nonNumeric></span></td><td style="width: 1%; text-align: left">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Granted</span></td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td id="xdx_987_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_pid_c20220501__20220731__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_z6q0StxPMAj7" title="Shares underlying options outstanding, granted" style="text-align: right"><span style="-sec-ix-hidden: xdx2ixbrl0835">&#8212;</span></td><td style="text-align: left">&#160;</td><td>&#160;</td>
    <td style="text-align: left">$</td><td id="xdx_98B_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_pid_c20220501__20220731__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_z4BHaOnXmyfl" title="Shares underlying options outstanding, granted" style="text-align: right"><span style="-sec-ix-hidden: xdx2ixbrl0837">&#8212;</span></td><td style="text-align: left">&#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 style="text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Exercised</span></td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td id="xdx_985_eus-gaap--StockIssuedDuringPeriodSharesStockOptionsExercised_iN_pid_di_c20220501__20220731__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zR5mwSojMHc7" title="Shares Underlying Options Outstanding, Exercised" style="text-align: right"><span style="-sec-ix-hidden: xdx2ixbrl0839">&#8212;</span></td><td style="text-align: left">&#160;</td><td>&#160;</td>
    <td style="text-align: left">$</td><td id="xdx_984_eus-gaap--ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_pid_c20220501__20220731__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zGhE28bOSKil" title="Weighted Average Exercise Price, Exercised" style="text-align: right"><span style="-sec-ix-hidden: xdx2ixbrl0841">&#8212;</span></td><td style="text-align: left">&#160;</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td style="text-align: right">&#160;</td><td style="text-align: left">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Cancelled/forfeited</span></td><td style="padding-bottom: 1.5pt">&#160;</td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left">&#160;</td><td id="xdx_987_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod_iN_pid_di_c20220501__20220731__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zSO09qRx9BE4" title="Shares Underlying Options Outstanding, Cancelled/forfeited" style="border-bottom: Black 1.5pt solid; text-align: right"><span style="-sec-ix-hidden: xdx2ixbrl0843">&#8212;</span></td><td style="padding-bottom: 1.5pt; text-align: left">&#160;</td><td style="padding-bottom: 1.5pt">&#160;</td>
    <td style="padding-bottom: 1.5pt; text-align: left">$</td><td id="xdx_98A_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice_pid_c20220501__20220731__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_z3n7cI6hkUki" title="Weighted Average Exercise Price, Cancelled/forfeited" style="padding-bottom: 1.5pt; text-align: right"><span style="-sec-ix-hidden: xdx2ixbrl0845">&#8212;</span></td><td style="padding-bottom: 1.5pt; text-align: left">&#160;</td><td style="padding-bottom: 1.5pt">&#160;</td>
    <td style="padding-bottom: 1.5pt; text-align: left">&#160;</td><td style="padding-bottom: 1.5pt; text-align: right">&#160;</td><td style="padding-bottom: 1.5pt; 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"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Outstanding as of July 31, 2022</span></td><td style="padding-bottom: 2.5pt">&#160;</td>
    <td style="border-bottom: Black 2.5pt double; text-align: left">&#160;</td><td id="xdx_982_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_iE_pid_c20220501__20220731__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zu8fb1O5Ixd8" title="Shares underlying options outstanding, ending" style="border-bottom: Black 2.5pt double; text-align: right"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber" contextRef="AsOf2022-07-31_custom_PerformanceStockOptionsMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">210,122</ix:nonFraction></td><td style="padding-bottom: 2.5pt; text-align: left">&#160;</td><td style="padding-bottom: 2.5pt">&#160;</td>
    <td style="padding-bottom: 2.5pt; text-align: left">$</td><td id="xdx_982_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_iE_pid_c20220501__20220731__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zoOYJSmdK3vh" title="Weighted average exercise price, ending balance" style="padding-bottom: 2.5pt; text-align: right"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice" contextRef="AsOf2022-07-31_custom_PerformanceStockOptionsMember" format="ixt:numdotdecimal" decimals="INF" unitRef="USDPShares">2.20</ix:nonFraction></td><td style="padding-bottom: 2.5pt; text-align: left">&#160;</td><td style="padding-bottom: 2.5pt">&#160;</td>
    <td style="padding-bottom: 2.5pt; text-align: left">&#160;</td><td style="padding-bottom: 2.5pt; text-align: right"><span id="xdx_90C_ecustom--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm_dtY_c20220501__20220731__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zblURCj3N4Ff" title="Weighted Average Remaining Contractual Term (In Years), Ending"><ix:nonNumeric contextRef="From2022-05-012022-07-31_custom_PerformanceStockOptionsMember" format="ixt-sec:duryear" name="OPTT:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm">8.6</ix:nonNumeric></span></td><td style="padding-bottom: 2.5pt; text-align: left">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Exercisable as of July 31, 2022</span></td><td style="padding-bottom: 2.5pt">&#160;</td>
    <td style="border-bottom: Black 2.5pt double; text-align: left">&#160;</td><td id="xdx_982_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_iI_pid_c20220731__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zD7QwVOzyGjh" title="Shares Underlying Options Outstanding, Exercisable at Ending" style="border-bottom: Black 2.5pt double; text-align: right"><span style="-sec-ix-hidden: xdx2ixbrl0853">&#8212;</span></td><td style="padding-bottom: 2.5pt; text-align: left">&#160;</td><td style="padding-bottom: 2.5pt">&#160;</td>
    <td style="padding-bottom: 2.5pt; text-align: left">$</td><td id="xdx_986_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_iI_pid_c20220731__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zvJWpECxI9Ik" title="Weighted average exercise price, exercisable at ending" style="padding-bottom: 2.5pt; text-align: right"><span style="-sec-ix-hidden: xdx2ixbrl0855">&#8212;</span></td><td style="padding-bottom: 2.5pt; text-align: left">&#160;</td><td style="padding-bottom: 2.5pt">&#160;</td>
    <td style="padding-bottom: 2.5pt; text-align: left">&#160;</td><td style="padding-bottom: 2.5pt; text-align: right">&#160;</td><td style="padding-bottom: 2.5pt; text-align: left">&#160;</td></tr>
  </table>

</ix:nonNumeric><p id="xdx_8A1_zh837vUntyq" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0; text-align: justify">As of July
31, 2022, approximately <span id="xdx_90D_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares_iI_pid_c20220731__us-gaap--AwardTypeAxis__us-gaap--PerformanceSharesMember_zli5jn4Hl6n5" title="Options, number of shares unvested"><ix:nonFraction name="us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares" contextRef="AsOf2022-07-31_us-gaap_PerformanceSharesMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">210,000</ix:nonFraction></span>
options were unvested, which had an intrinsic value of <span id="xdx_90B_ecustom--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsUnvestedOutstandingIntrinsicValue_iI_dc_c20220731__us-gaap--AwardTypeAxis__us-gaap--PerformanceSharesMember_zxqI2FiKrccb" title="Options, outstanding, intrinsic value"><ix:nonFraction name="OPTT:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsUnvestedOutstandingIntrinsicValue" contextRef="AsOf2022-07-31_us-gaap_PerformanceSharesMember" format="ixt-sec:numwordsen" decimals="0" unitRef="USD">zero</ix:nonFraction></span>
and
a weighted average remaining contractual term of <span id="xdx_901_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1_dtY_c20220501__20220731__us-gaap--AwardTypeAxis__us-gaap--PerformanceSharesMember_zK8j58puyq1l" title="Weighted average remaining contractual term"><ix:nonNumeric contextRef="From2022-05-012022-07-31_us-gaap_PerformanceSharesMember" format="ixt-sec:duryear" name="us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1">8.6</ix:nonNumeric></span>
years.
There was approximately $<span id="xdx_90B_eus-gaap--AllocatedShareBasedCompensationExpense_c20220501__20220731__us-gaap--AwardTypeAxis__us-gaap--PerformanceSharesMember_zdR34MdaB2v4" title="Recognized compensation cost"><ix:nonFraction name="us-gaap:AllocatedShareBasedCompensationExpense" contextRef="From2022-05-012022-07-31_us-gaap_PerformanceSharesMember" format="ixt:numdotdecimal" decimals="0" unitRef="USD">52,500</ix:nonFraction></span>
and
$<span id="xdx_908_eus-gaap--AllocatedShareBasedCompensationExpense_c20210501__20210731__us-gaap--AwardTypeAxis__us-gaap--PerformanceSharesMember_zdPh7IaAz939" title="Recognized compensation cost"><ix:nonFraction name="us-gaap:AllocatedShareBasedCompensationExpense" contextRef="From2021-05-012021-07-31_us-gaap_PerformanceSharesMember" format="ixt:numdotdecimal" decimals="0" unitRef="USD">95,000</ix:nonFraction></span>
of
total recognized compensation cost related to stock options during the three months ended July 31, 2022 and 2021, respectively. As of
July 31, 2022, there was approximately $<span id="xdx_90C_eus-gaap--EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions_iI_pn5n6_c20220731__us-gaap--AwardTypeAxis__us-gaap--PerformanceSharesMember_zjAqys2MPlCk" title="Unrecognized compensation cost"><ix:nonFraction name="us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions" contextRef="AsOf2022-07-31_us-gaap_PerformanceSharesMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">0.1</ix:nonFraction>
</span>million
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_90C_eus-gaap--EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_dtY_c20220501__20220731__us-gaap--AwardTypeAxis__us-gaap--PerformanceSharesMember_z5ddSpHVPaw3" title="Share-based compensation of weighted-average period"><ix:nonNumeric contextRef="From2022-05-012022-07-31_us-gaap_PerformanceSharesMember" format="ixt-sec:duryear" name="us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1">0.6</ix:nonNumeric>
</span>years.</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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 three months ended July 31, 2022 and 2021, the Company granted <span><span id="xdx_90E_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_c20220501__20220731_z8nbloO5eat7" title="Number of restricted shares, granted"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" contextRef="From2022-05-01to2022-07-31" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">51,500</ix:nonFraction></span> and <span><span id="xdx_90C_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_dc_c20210501__20210731_zHxhwHgqkMR6" title="Number of restricted shares, granted"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" contextRef="From2021-05-012021-07-31" format="ixt-sec:numwordsen" decimals="INF" unitRef="Shares">zero</ix:nonFraction></span></span></span> shares, respectively that
were subject to service-based vesting requirements.</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">&#160;</span></p>


<ix:exclude><!-- Field: Page; Sequence: 20; Value: 2 -->
    <div style="border-bottom: Black 1.5pt solid; margin-top: 0pt; 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; margin-bottom: 0pt"><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 Content</a></td></tr></table></div>
    <!-- Field: /Page --></ix:exclude>

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

<ix:nonNumeric contextRef="From2022-05-01to2022-07-31" escape="true" name="us-gaap:ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityTableTextBlock"><p id="xdx_894_eus-gaap--ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityTableTextBlock_zXhzV3QLufq" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_8BA_zfnAiHlVJ1N8" 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="vertical-align: bottom">
    <td>&#160;</td><td style="padding-bottom: 1.5pt">&#160;</td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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="padding-bottom: 1.5pt">&#160;</td><td style="padding-bottom: 1.5pt">&#160;</td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Average
Price <br />
per</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Share</b></span></p></td><td style="padding-bottom: 1.5pt">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="width: 60%; text-align: left">Unvested at April 30, 2022</td><td style="width: 2%">&#160;</td>
    <td style="width: 1%; text-align: left">&#160;</td><td id="xdx_988_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_iS_pid_c20220501__20220731__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_z8F9ER2s8fV" title="Number of Shares, Unvested, Beginning" style="width: 16%; text-align: right"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" contextRef="AsOf2022-04-30_custom_NonVestedRestrictedStockMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">827,764</ix:nonFraction></td><td style="width: 1%; text-align: left">&#160;</td><td style="width: 2%">&#160;</td>
    <td style="width: 1%; text-align: left">$</td><td id="xdx_981_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_iS_pid_c20220501__20220731__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_zeS3otUL2eO6" title="Weighted Average Price per Share, Unvested, Beginning" style="width: 16%; text-align: right"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" contextRef="AsOf2022-04-30_custom_NonVestedRestrictedStockMember" format="ixt:numdotdecimal" decimals="INF" unitRef="USDPShares">1.41</ix:nonFraction></td><td style="width: 1%; text-align: left">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td>Granted</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td id="xdx_983_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_pid_c20220501__20220731__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_zXrQarTRni9" title="Number of Shares, Unvested, Granted" style="text-align: right"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" contextRef="From2022-05-012022-07-31_custom_NonVestedRestrictedStockMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">51,500</ix:nonFraction></td><td style="text-align: left">&#160;</td><td>&#160;</td>
    <td style="text-align: left">$</td><td id="xdx_984_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_pid_c20220501__20220731__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_zwKiFmztzVO3" title="Weighted Average Price per Share, Unvested, Granted" style="text-align: right"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" contextRef="From2022-05-012022-07-31_custom_NonVestedRestrictedStockMember" format="ixt:numdotdecimal" decimals="INF" unitRef="USDPShares">1.12</ix:nonFraction></td><td style="text-align: left">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td>Vested and issued</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td id="xdx_987_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_iN_pid_di_c20220501__20220731__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_zF1erS6FPacd" title="Number of Shares, Unvested, Vested and issued" style="text-align: right">(<ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod" contextRef="From2022-05-012022-07-31_custom_NonVestedRestrictedStockMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">16,667</ix:nonFraction></td><td style="text-align: left">)</td><td>&#160;</td>
    <td style="text-align: left">$</td><td id="xdx_989_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_pid_c20220501__20220731__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_z0lyVGHJ7yll" title="Weighted Average Price per Share, Unvested, Vested" style="text-align: right"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue" contextRef="From2022-05-012022-07-31_custom_NonVestedRestrictedStockMember" format="ixt:numdotdecimal" decimals="INF" unitRef="USDPShares">2.37</ix:nonFraction></td><td style="text-align: left">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td style="padding-bottom: 1.5pt">Cancelled/forfeited</td><td style="padding-bottom: 1.5pt">&#160;</td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left">&#160;</td><td id="xdx_984_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_iN_pid_di_c20220501__20220731__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_zjXGo2Lej04l" title="Number of Shares, Unvested, Cancelled/forfeited" style="border-bottom: Black 1.5pt solid; text-align: right"><span style="-sec-ix-hidden: xdx2ixbrl0889">&#8212;</span></td><td style="padding-bottom: 1.5pt; text-align: left">&#160;</td><td style="padding-bottom: 1.5pt">&#160;</td>
    <td style="padding-bottom: 1.5pt; text-align: left">&#160;</td><td style="padding-bottom: 1.5pt; text-align: right">&#160;</td><td style="padding-bottom: 1.5pt; text-align: left">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left; padding-bottom: 2.5pt">Unvested at July 31, 2022</td><td style="padding-bottom: 2.5pt">&#160;</td>
    <td style="border-bottom: Black 2.5pt double; text-align: left">&#160;</td><td id="xdx_981_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_iE_pid_c20220501__20220731__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_zDrOwWfdI1I7" title="Number of Shares, Unvested, Ending" style="border-bottom: Black 2.5pt double; text-align: right"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" contextRef="AsOf2022-07-31_custom_NonVestedRestrictedStockMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">862,597</ix:nonFraction></td><td style="padding-bottom: 2.5pt; text-align: left">&#160;</td><td style="padding-bottom: 2.5pt">&#160;</td>
    <td style="padding-bottom: 2.5pt; text-align: left">$</td><td id="xdx_98D_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_iE_pid_c20220501__20220731__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_zgHvsBu9eRO5" title="Weighted Average Price per Share, Unvested, Ending" style="padding-bottom: 2.5pt; text-align: right"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" contextRef="AsOf2022-07-31_custom_NonVestedRestrictedStockMember" format="ixt:numdotdecimal" decimals="INF" unitRef="USDPShares">1.38</ix:nonFraction></td><td style="padding-bottom: 2.5pt; text-align: left">&#160;</td></tr>
  </table>

</ix:nonNumeric><p id="xdx_8A6_z9yoWlUSdoc1" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">There
was approximately $<span id="xdx_90C_eus-gaap--AllocatedShareBasedCompensationExpense_pp0p0_c20220501__20220731__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_z7Z7rmvjodid" title="Share-based payment arrangement, expense"><ix:nonFraction name="us-gaap:AllocatedShareBasedCompensationExpense" contextRef="From2022-05-012022-07-31_us-gaap_RestrictedStockMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">184,000</ix:nonFraction></span> and $<span id="xdx_907_eus-gaap--AllocatedShareBasedCompensationExpense_pp0p0_c20210501__20210731__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_zgFk8NwjLQzh"><ix:nonFraction name="us-gaap:AllocatedShareBasedCompensationExpense" contextRef="From2021-05-012021-07-31_us-gaap_RestrictedStockMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">14,000</ix:nonFraction></span> of total recognized compensation cost related to restricted stock for the three months ended July
31, 2022 and 2021, respectively. As of July 31, 2022, there is approximately $<span id="xdx_90C_eus-gaap--EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_iI_c20220731__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_z8hzhqqf6Bu6" title="Unrecognized compensation cost"><ix:nonFraction name="us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions" contextRef="AsOf2022-07-31_us-gaap_RestrictedStockMember" format="ixt:numdotdecimal" decimals="0" unitRef="USD">821,067</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 <span id="xdx_90E_eus-gaap--EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_dtY_c20220501__20220731__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_zX3KEAttj48l" title="Share-based compensation of weighted-average period"><ix:nonNumeric contextRef="From2022-05-012022-07-31_us-gaap_RestrictedStockMember" format="ixt-sec:duryear" name="us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1">1.8</ix:nonNumeric></span> years.</span></p>

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

</ix:nonNumeric><ix:nonNumeric contextRef="From2022-05-01to2022-07-31" escape="true" name="us-gaap:FairValueDisclosuresTextBlock"><p id="xdx_807_eus-gaap--FairValueDisclosuresTextBlock_zc7BCZRdtE86" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(12)
<span id="xdx_82A_z0FbtkvJMJW4">Fair Value Measurements</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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; width: 0.6in"><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"><span style="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"><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"><span style="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"><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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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: 0; text-align: justify">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 Company&#8217;s contingent consideration liability represent the only asset or liability classified
financial instrument that is measured at fair value on a recurring basis.</p>
<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
total carrying value of our marketable securities approximates fair value due to the short term nature of these investments. As of
July 31, 2022 and April 30, 2022, the carrying values were $<span id="xdx_909_eus-gaap--InvestmentsFairValueDisclosure_iI_pn5n6_c20220731_zdQsP3Zc3h9l" title="Fair value of investments"><ix:nonFraction name="us-gaap:InvestmentsFairValueDisclosure" contextRef="AsOf2022-07-31" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">42.7</ix:nonFraction></span>
million and $<span id="xdx_90F_eus-gaap--InvestmentsFairValueDisclosure_iI_pn5n6_c20220430_zJwlsS6u58G2" title="Fair value of investments"><ix:nonFraction name="us-gaap:InvestmentsFairValueDisclosure" contextRef="AsOf2022-04-30" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">49.4</ix:nonFraction></span>
million, respectively.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Additionally,
there is a Level 3 contingent liability related to earnouts as part of the MAR acquisition in the amount of $<span id="xdx_90C_eus-gaap--BusinessCombinationContingentConsiderationLiability_iI_pn5n6_c20220731__us-gaap--FairValueByFairValueHierarchyLevelAxis__us-gaap--FairValueInputsLevel3Member_zKPBnFnp68A6" title="Contingent liability MAR acquisition amount"><ix:nonFraction name="us-gaap:BusinessCombinationContingentConsiderationLiability" contextRef="AsOf2022-07-31_us-gaap_FairValueInputsLevel3Member" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">1.5</ix:nonFraction></span> million as the inputs
are currently unobservable to determine this fair value. As of July 31, 2022, the fair value of this contingent liability from
the time that it was acquired has decreased by $<span id="xdx_90B_ecustom--IncreaseDecreaseInContingentLiability_pn5n6_c20220501__20220731__us-gaap--FairValueByFairValueHierarchyLevelAxis__us-gaap--FairValueInputsLevel3Member_zSMQzgVw7xV6" title="Decrease in contingent liability"><ix:nonFraction name="OPTT:IncreaseDecreaseInContingentLiability" contextRef="From2022-05-012022-07-31_us-gaap_FairValueInputsLevel3Member" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">0.1</ix:nonFraction></span> million from $<span id="xdx_907_eus-gaap--ContingentConsiderationClassifiedAsEquityFairValueDisclosure_iI_pn5n6_c20220731__us-gaap--FairValueByFairValueHierarchyLevelAxis__us-gaap--FairValueInputsLevel3Member_z49tClFdyBWe" title="Fair value of contingent consideration"><ix:nonFraction name="us-gaap:ContingentConsiderationClassifiedAsEquityFairValueDisclosure" contextRef="AsOf2022-07-31_us-gaap_FairValueInputsLevel3Member" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">1.6</ix:nonFraction></span> million.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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 months ended July 31, 2022 and 2021.</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">&#160;</span></p>


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    <div style="break-before: page; margin-top: 6pt; margin-bottom: 0pt"><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 Content</a></td></tr></table></div>
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<p style="font: 10pt Times New Roman, Times, Serif; text-align: center; margin-top: 0pt; margin-bottom: 0pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>&#160;</b></span></p>

</ix:nonNumeric><ix:nonNumeric contextRef="From2022-05-01to2022-07-31" escape="true" name="us-gaap:CommitmentsAndContingenciesDisclosureTextBlock"><p id="xdx_804_eus-gaap--CommitmentsAndContingenciesDisclosureTextBlock_zJHR4dFHGwg5" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(13)
<span id="xdx_827_zy6bjfeyxt6f">Commitments and Contingencies</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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 its 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 year ended April 30, 2022,
the Company received notice from the Spanish Central Economic and Administrative Tribunal (&#8220;Spanish Tax Administration&#8221;)
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_903_eus-gaap--IncomeTaxExaminationPenaltiesAndInterestAccrued_iI_pp0p0_uEuro_c20210125__us-gaap--IncomeStatementLocationAxis__us-gaap--SellingGeneralAndAdministrativeExpensesMember__us-gaap--IncomeTaxAuthorityNameAxis__us-gaap--TaxAuthoritySpainMember_zBPaAqeNM2f8" 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> or approximately
$<span id="xdx_90B_eus-gaap--IncomeTaxExaminationPenaltiesAndInterestAccrued_iI_pp0p0_c20220731__us-gaap--IncomeStatementLocationAxis__us-gaap--SellingGeneralAndAdministrativeExpensesMember__us-gaap--IncomeTaxAuthorityNameAxis__us-gaap--TaxAuthoritySpainMember_zzsBD0GV26o2" title="Income tax penalties"><ix:nonFraction name="us-gaap:IncomeTaxExaminationPenaltiesAndInterestAccrued" contextRef="AsOf2022-07-31_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_90F_eus-gaap--LossContingencyDamagesPaidValue_pp0p0_uEuro_c20210124__20210125__us-gaap--IncomeTaxAuthorityNameAxis__us-gaap--TaxAuthoritySpainMember_zKtrUPGqHvv7" title="Payment of tax on damages"><ix:nonFraction name="us-gaap:LossContingencyDamagesPaidValue" contextRef="From2021-01-242021-01-25_us-gaap_TaxAuthoritySpainMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="Euro">279,870</ix:nonFraction></span>. Notwithstanding that payment, on April
30, 2022, the Company filed its appeal of the decision of the Central Court to the Spanish National Court. The Company expects a ruling
on the appeal prior to the end of fiscal 2023.</span></p>

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

</ix:nonNumeric><ix:nonNumeric contextRef="From2022-05-01to2022-07-31" escape="true" name="us-gaap:IncomeTaxDisclosureTextBlock"><p id="xdx_80B_eus-gaap--IncomeTaxDisclosureTextBlock_zyqBPy7S5dYd" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(14)
<span id="xdx_82B_zlYmv30CE0z2">Income Taxes</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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. The Company is currently undergoing an income tax audit
in Spain for the period from 2011 to 2014, when the Company&#8217;s Spanish branch was closed. At July 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. 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company does not have any interest or penalties accrued related to uncertain tax positions as it does not have any unrecognized tax benefits.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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 New Jersey Economic Development Authority
Tax Transfer program in the amount of approximately $<span id="xdx_902_eus-gaap--OperatingLossCarryforwards_iI_pn5n6_c20210430__us-gaap--IncomeTaxAuthorityNameAxis__us-gaap--NewJerseyDivisionOfTaxationMember_zoBipJCGVqb8" title="Operating loss"><ix:nonFraction name="us-gaap:OperatingLossCarryforwards" contextRef="AsOf2021-04-30_us-gaap_NewJerseyDivisionOfTaxationMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">12.0</ix:nonFraction></span> million for the year ended April 30, 2021, for net proceeds of approximately
$<span id="xdx_90D_ecustom--ProceedFromSaleOfLossCarryforwardsAndTaxCredits_pn5n6_c20210501__20210531_z2IjjvzVOs1b"><ix:nonFraction name="OPTT:ProceedFromSaleOfLossCarryforwardsAndTaxCredits" contextRef="From2021-05-012021-05-31" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">1.0</ix:nonFraction> </span>million which was received in May 2021 and recorded in the Company&#8217;s Statement of Operations in fiscal year 2022. There was
<span id="xdx_909_eus-gaap--IncomeTaxExpenseBenefit_pn5n6_do_c20220501__20220731__us-gaap--IncomeTaxAuthorityNameAxis__us-gaap--NewJerseyDivisionOfTaxationMember_zrFAg9CVuDCi" title="Income tax benefit"><ix:nonFraction name="us-gaap:IncomeTaxExpenseBenefit" contextRef="From2022-05-012022-07-31_us-gaap_NewJerseyDivisionOfTaxationMember" format="ixt-sec:numwordsen" decimals="-5" scale="6" unitRef="USD">no</ix:nonFraction></span> income tax benefit related to the three months ended July 31, 2022.</span></p>

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

</ix:nonNumeric><ix:nonNumeric contextRef="From2022-05-01to2022-07-31" escape="true" name="us-gaap:SegmentReportingDisclosureTextBlock"><p id="xdx_803_eus-gaap--SegmentReportingDisclosureTextBlock_zlrryHlsMkM4" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(15)
<span id="xdx_82C_ze4EJ4aU5QB4">Operating Segments and Geographic Information</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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_90C_eus-gaap--NumberOfOperatingSegments_pid_dc_uSegment_c20220501__20220731_zosv5LDhP2A4" title="Number of operating segments"><ix:nonFraction name="us-gaap:NumberOfOperatingSegments" contextRef="From2022-05-01to2022-07-31" format="ixt-sec:numwordsen" decimals="INF" unitRef="Segment">one</ix:nonFraction></span>
reportable segment as the revenues associated with its different business lines are not material enough to justify segment reporting
or to make it meaningful to investors, and our chief operating decision maker does not view the Company&#8217;s operations on a
segment basis. The Company operates on a worldwide basis with one operating company in the U.S. and one operating subsidiary in the
UK and one operating subsidiary which was discontinued during 2022 in Australia. Revenues and expenses are generally attributed to
the operating unit that bills the customers. During each of the three months ended July 31, 2022 and 2021, the Company&#8217;s
primary business operations were in North America.</span></p>

</ix:nonNumeric><p id="xdx_813_zmlYgn81vPai" 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">&#160;</span></p>


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<p style="font: 10pt Times New Roman, Times, Serif; text-align: center; margin-top: 0pt; margin-bottom: 0pt"><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; text-align: justify; margin-top: 0pt; margin-bottom: 0pt"> <span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><span id="a_009"></span>Item 2.</b></span> <span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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, 2022 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 2023 refers to the year ended April 30, 2023).</span></p>

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

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Our
solutions focus on three major service areas, Data as a Service (&#8220;DaaS&#8221;), which includes data collected by our Wave Adaptive
Modular Vessel (WAM-V&#174;) autonomous vehicles or our PowerBuoy&#174; Product lines; Power as a Service (&#8220;PaaS&#8221;), which includes
our PowerBuoy&#174; and Subsea battery products; and our Strategic Consulting Services.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">We
provide ocean data collection and reporting, marine power, offshore communications, and Maritime Domain Awareness
(&#8220;MDA&#8221;) products and consulting services. We offer our products and services to a wide-range of customers, including
those in government and offshore energy, oil and gas, construction, wind power and other industries. We are involved in the entire
life cycle of product development, from product design through manufacturing, testing, deployment, maintenance and upgrades, while
working closely with partners across our supply chain. We also work closely with our third party partners that provide us with,
among other things, software, controls, sensors, integration services, and marine installation services. Our solutions enable
technologies for data collection, analysis, and communication in ocean and other offshore environments, and generate actionable
intelligence via a variety of inputs. We then channel the information we collect, and other communications, through control
equipment linked to edge computing and cloud hosting environments.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Our
mission is to provide intelligent maritime solutions and services that enable more secure and more productive utilization of our oceans
and waterways, provide clean energy power services, and offer sophisticated surface and subsea maritime 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,
and our solutions and services.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Business
Update Regarding COVID-19</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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. 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 not only consuming internal inventory but also by expanding our supply
base. While our supply chain is primarily domestically oriented with the majority of our products domestically sourced, we obtain
some components from Asia and Europe. We use a combination of off-the-shelf components and equipment 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 and raw materials. 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 without compromising our product standards or integrity, 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.</span></p>

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

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">As of July 31, 2022, some COVID-related problems are
starting to ease. However, ongoing labor pool shortages are continuing and are impacting some of our delivery deadlines. Like others in
the industry, we continue to have concerns over component shortages, particularly for semiconductors, lithium-ion batteries and specialty
metals, however, this has not prevented us from manufacturing our products. 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.</p>

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


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<p style="font: 10pt Times New Roman, Times, Serif; text-align: center; margin-top: 0pt; margin-bottom: 0pt"><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; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Our
DaaS solution is at the forefront of our strategic plan to be a leader in offshore data collection, integration, analytics and real time
communication for a variety of important applications. For example, our solutions can track surface movement for maritime border enforcement,
illegal fishing interdiction, provide security for offshore wind farms and oil and gas fields, or provide harbor or port security as
well as logistics support. We have the ability to support aquaculture and gather information on ocean currents, water quality, wind and
other weather metrics, and map shorelines or subsurface areas. Additionally, we offer 24/7 monitoring solutions that can provide meaningful
real time information, and long term data collection and analytics for sophisticated applications across many industries and scientific
applications.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">As
part of our DaaS offering, in <span style="background-color: white">October 2020, the Company entered into an agreement with Adams Communication&#160;&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;).
As of July 31, 2022</span>, the Company continues to work with the Naval Postgraduate School and SLAMR to explore how 5G technologies
can be used to connect ships, all-domain autonomous systems, and sensors in the domain where the U.S. Navy and U.S. Marine Corps operate.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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 the security, safety, economy, or environment related to and within our oceans and seas. Since 2002, the United States
of America has had an active strategy to secure the maritime domain, primarily through the U.S. Navy. 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">We
have designed our solution to provide detailed, localized maritime domain awareness that can be utilized for a wide range of applications
across market segments. Our MDAS base hardware consists of a high-definition radar, a stabilized high-definition optical and thermal
imaging camera, and a vessel automatic identification system (&#8220;AIS&#8221;) detection module. This hardware can be customized or
supplemented by other solutions, depending on our customer&#8217;s requirements. These devices can be mounted on our products, such as
our PB3 PowerBuoy&#174; or WAM-V&#174;, and then utilizing integrated command and control software, data is sent to us and to our customers
via secure communications channels. Multiple sensors can be used on a single unit based on the comprehensiveness of customer needs. Capabilities
of our MDAS include 24/7 vessel tracking, automatic radar plotting, and high-definition optical and thermal video surveillance capable
of providing actionable intelligence day or night, in real time.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Our
MDAS processes data onboard our buoys using edge computing and transmits the results to our cloud-based analytics platform via secure
Wi-Fi, and cellular. We anticipate integrating MDAS into our WAM-Vs&#174; and utilizing satellite communication to expand the availability
of our data service. Surveillance data can be integrated with third party 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. This network can be coordinated with the use of our WAM-Vs&#174; so that customers can have mobile sensor networks linked to
our self-powered buoy data and communication hubs. 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
development of a complete, integrated MDAS is still underway; however, we achieved a key milestone in October 2021, with the initiation
of our offshore demonstration of the new system utilizing our hardware and TimeZero software off the coast of New Jersey. To date we
have collected more than 3,000 radar and AIS tracks from this demonstration, which is being used to refine the design of our MDAS. Initial
field demonstration of our MDAS software began in May 2022 and is ongoing.</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">&#160;</span></p>


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

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>Autonomous
Vehicles (&#8220;WAM-V</i></b><sup>&#174;</sup><b><i>&#8221;)</i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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;). Founded in 2004, MAR is the developer of the patented Wave Adaptive Modular Vessel (WAM-V&#174;) technology,
which enables roaming capabilities for unmanned maritime systems in waters around the world. MAR launched the first WAM-V&#174; in
2007 as a new vessel class to deliver to customers reliable autonomous surface vehicles that could provide robust, real-time data
collection and reporting. MAR also provides RaaS (Robotics as a Service) allowing customers to lease WAM-V&#174; robotics and access
information from our WAM-Vs&#174; while we maintain ownership and maintenance and repair responsibilities. Today, WAM-Vs&#174; operate
in 11 countries for commercial, military and scientific uses. Our WAM-Vs&#174; exist in three primary sizes, 8, 16, and 22 feet,
however, many of the design components are common across the sizes, allowing for integration of different payloads and adaption of
the payload platforms for larger equipment. All sizes can be adapted to suit different propulsion methods.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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 product line that highly complements the Company&#8217;s business strategy
and can be used inshore, nearshore, and offshore. Since the acquisition, the business of 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 leverage MAR technology
with the Company, we expect to expand on the synergistic opportunities we have identified. For example, we plan to integrate the MDAS
platform onto the WAM-V&#174; 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">PaaS
solutions deliver value to customers by utilizing our managed power platforms. We continue to develop and commercialize our
proprietary power platforms that generate electricity primarily by harnessing the renewable energy of ocean waves for our PB3
PowerBuoy&#174; (&#8220;PB3&#8221;), solar power for our hybrid PowerBuoy&#174; (the &#8220;hybrid PB&#8221;) and have the option of
adding small wind turbines to supplement power generation. We also continue to commercialize our subsea battery for subsea power
applications and as additional storage when combined with our buoy platforms. Our focus for these solutions is on bringing
autonomous clean power to our customers wherever it is required. Moreover, offshore data and communications networks require power
to function, and our solution solves for this need without requiring ongoing battery replacement or older technologies such as shore
to station power cables. Lessons learned from the deployments of both our PB3 and hybrid PB are being used to develop the next
generation of PowerBuoy&#174; systems that is based on modularity for Wave Energy Converter (&#8220;WEC&#8221;) and non-WEC
applications. The PB3 and hybrid PB will continue to be available and supported.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
PB3 uses proprietary technologies that convert the hydrokinetic energy of ocean waves into electricity. 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 nameplate 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, as wave activity impacts power generation. Our energy storage system (&#8220;ESS&#8221;)
has a 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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 offshore locations. The hull consists of a main spar structure
compliantly 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 the ESS.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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 protect the PB3 from being damaged by
storms.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Our
PB3 can be equipped with MDAS, which can, among other functions, monitor vessel traffic across a specific offshore area of interest,
with the ability to utilize 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, tsunami activity, and water quality.</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">&#160;</span></p>


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

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
hybrid PB is an alternative platform to the PB3 capable of utilizing solar and wind power. The
hybrid PB is capable of providing reliable power in remote offshore locations, regardless of ocean wave conditions. We believe this product
addresses a broader spectrum of customer deployment needs, including low-wave and nearshore environments, with the potential for greater
product integration within each customer project. The hybrid PB is intended to provide a stable energy platform for our MDAS solution,
and for agile deployment of subsea power applications, such as a surface communications hub for electric remotely operated vehicles (&#8220;eROV&#8221;)
and autonomous underwater vehicles (&#8220;AUV&#8221;) used for underwater inspections and short-term maintenance, and 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 lithium
ion batteries which can power subsea and topside payloads. The control system uses sensors and an onboard computer to continuously monitor
the hybrid PB subsystems. The hybrid PB is designed to be able to operate over a broad range of temperature and ocean wave conditions.
It has a 30kW-hour battery system and carries up to 1.2MW-hour energy when combined with the current onboard propane storage system.
We are also developing another hybrid system with increased solar capacity and increased battery storage with the option of adding incremental
wind turbine power generation, replacing the propane system.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Our
subsea battery is complementary to both the PB3 and hybrid PB products and can be deployed together with our PowerBuoys&#174; or as a
standalone unit. 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 phosphate subsea batteries supply power that can enable subsea
equipment, sensors, communications and AUV and eROV recharge. Our PB3 and hybrid PB 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
subsea battery provides both long 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 available energy storage and is designed
to operate in a water depth of up to 500 meters. 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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
in support of our broader PaaS and/or DaaS solutions, utilizing our products or on an independent basis for third party clients. In the
near term, we will focus on increasing our market share in the offshore wind market, the broader floating foundation design market, as
well as with our offshore energy customers.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">We
intend to continue to grow our service sectors and strengthen our solutions through internal developments, partnerships, and potential
acquisitions. Our Strategic Consulting Services were materially expanded with the acquisition of 3dent Technology, LLC (&#8220;3Dent&#8221;),
in February 2021. Our team of dedicated consultants/designers has expertise in structural engineering, hydrodynamics and naval architecture.
Consulting services include simulation engineering, developing purpose specific software, concept design and motion analysis. We also
offer a full range of high-level offshore engineering to offshore wind developers, offshore construction companies, drilling contractors,
major oil companies, service companies, shipyards, and engineering firms. For example, we advise offshore drill rig owners, including
owners of floaters, jackups, and lift boats. The Company has seen an increase in consulting services activity for conventional offshore
energy and for offshore wind projects over the last year and continuing into the first quarter of fiscal year 2023.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0; text-align: justify"><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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Our
strategy includes developing integrated solutions and services, including autonomous and 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, data collection, and communications,
either by supplying electric power to payloads that are integrated directly with our products or located in its vicinity, such as on
the surface, the seabed, or 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-top: 0pt; margin-bottom: 0pt; 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; text-align: center; 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-top: 0pt; margin-bottom: 0pt; margin-left: 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 2019 DOE Report: Exploring Opportunities for Marine
Renewable Energy in Maritime Markets Report (the &#8220;Powering the Blue Economy Report&#8221;), and the Westwood Global Energy World
ROV Operations Forecast 2019-2023, we believe there is an increasing need for our products and services in maritime domain awareness
applications and numerous other markets.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Potential
customers include, but are not limited to, defense and security, offshore oil and gas, science and research, and offshore wind markets,
as well as government applications in border security, vessel tracking, fishery protection, aquaculture, and monitoring of marine protected
areas. For example, autonomously monitoring and surveying offshore wind farm lease areas would enable developers to collect data needed
to support environmental impact studies with low carbon emissions. This could be done with buoys and vehicles.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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: 0; text-align: justify">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. For the three months ended July 31, 2022 and 2021, the Company had three and two customers, respectively whose revenues accounted
for at least 10% of the Company&#8217;s consolidated revenues. These revenue accounted for approximately 69% and 88% of the Company&#8217;s
total revenue for the respective periods.</p>
<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">In
order to achieve success in ongoing efforts to commercialize 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 solutions includes various public and private
entities, and agencies that require remote offshore power.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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
                                            November 2021 MAR acquisition has led to contracts to build WAM-Vs&#174; for Brigham Young
                                            University, Nippon Kaiyo, Australian Defense, S.T. Hudson, and Applied Research Lab at University
                                            of Hawaii, and has resulted in leased WAM-Vs&#174; to Sulmara and other commercial customers
                                            and universities.</span></td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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 2021, the Company was notified of a pre-award for a DOE Phase I Small Business Innovation
                                            Research program (&#8220;SBIR&#8221;) to support the development of the next generation of
                                            our wave energy conversion systems. We then initiated a subsequent 9-month follow-on project
                                            which began in July of fiscal 2022. We completed Phase I in April of fiscal year 2022 and
                                            were notified of a pre-award for Phase II which is expected to begin in September or October
                                            2022.</span></td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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">For the three months ended July&#160;31, 2022, our Strategic Consulting Services continued to generate revenues from both existing
                                            and new customers of approximately $365,000. Notably, we advanced several large projects
                                            in the pipeline with larger oil and gas operators and offshore wind developers.</span></td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0.5in; text-align: justify; text-indent: -0.25in"><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-top: 0pt; margin-bottom: 0pt; margin-left: 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%; 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 Enel Green Power Chile,
                                            LTDA (&#8220;EGP&#8221;), which included the sale of a PB3 and the development and supply
                                            of a turn-key integrated Open Sea Lab (&#8220;OSL&#8221;) which was the Company&#8217;s first
                                            deployment off the coast of Chile. Due to the COVID-19 pandemic and other factors, force
                                            majeure was declared in April 2020 and delayed the deployment. In April 2021, the Company
                                            resumed the deployment process and placed the PB3 in the water. During fiscal 2022, deployment
                                            of the PB3 was completed. Ongoing installation and commissioning activities of the OSL subsea
                                            equipment continue into fiscal 2023.</span></td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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 autonomous exclusion zone monitoring service during well decommissioning.
                                            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 to provide subsea power and communication
                                            for well monitoring 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Business
Relationships</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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 various platforms and integrate them with surface and subsea payloads.
The Company has previously entered into business relationships 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 business relationships
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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Fathom5
designed and is building a customized data platform that supports the Company&#8217;s MDAS with sensor data feed management, secure communications
management, a cloud-based infrastructure, and web-based user interface. The platform was designed with a flexible architecture that allows
the Company to integrate new sensor technologies and third-party analytics capabilities and share MDAS data with customers and partners.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">We
also maintain active dialogue 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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: 0; text-align: justify">During fiscal 2022, we advanced our marketing programs,
products, and solutions. We have made progress in transitioning from an R&amp;D focused organization to more robust commercialization
efforts and we are moving further into the ocean DaaS market. We intend to build on these efforts by introducing additional processes
and making investments in appropriate human capital to target potential customers more effectively from demand generation to close of
contract. In addition we are focusing on customer care and service efforts to increase repeat business opportunities. This strategy was
further enhanced by our acquisition of MAR in November 2021.</p>
<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
majority of the Company&#8217;s potential customers are in areas of defense and security, hydrographic survey, and maritime domain awareness,
including mitigation of IUU fishing. These are largely for customers in the United States, where the end use may be both domestic or
abroad. Further, the Company&#8217;s acquisition of MAR provides an unmanned surface vehicle platform for use in oil &amp; gas, renewable
energy, hydrographic survey, and security and defense markets largely in North America and Europe.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Historically,
demonstration projects have been a requisite step towards broad solution deployment and revenues associated with specific applications
such as our New Jersey MDAS test array as part of our DaaS solution and to highlight these capabilities. Customers may want their own
dedicated demonstration depending on customer needs. 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 its capabilities. Such demonstrations are often a required step prior to leasing and may include negotiation of standard
terms and conditions. Many proposals contain provisions which would provide the option to purchase or lease of our PowerBuoy&#174; or
WAM-V&#174; product upon successful conclusion of the demonstration project. The Company has successfully demonstrated the capabilities
of many of its solutions on its own or in customers sponsored evaluation projects and remains focused on further demonstrations to build
customer awareness and confidence and to drive sales.</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">&#160;</span></p>


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<p style="font: 10pt Times New Roman, Times, Serif; text-align: center; 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-top: 0pt; margin-bottom: 0pt; margin-left: 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 growing the Company&#8217;s revenue base.
This strategy includes partnerships with leading companies and organizations in adjacent and complementary markets. We continue to develop
our PowerBuoy&#174; and WAM-V&#174; products for use in offshore power, data acquisition, 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-top: 0pt; margin-bottom: 0pt; margin-left: 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">Integrated
                                            turn-key solutions, purchases or leases. We believe our DaaS and PaaS solutions, together
                                            with our platforms, are well suited to enable unmanned, autonomous (non-grid connected) offshore
                                            applications, such as topside and subsea surveillance and communications, subsea equipment
                                            monitoring, early warning systems platform, 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/or 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 diagnostics, 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, engineering, product development,
                                            safety, and application support, and through engagement of expert market consultants in various
                                            geographies. As our MDAS development continues, 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-top: 0pt; margin-bottom: 0pt; margin-left: 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">Expand
                                            customer system solution offerings through new complementary products that enable shorter
                                            and more cost-efficient deployments. We are continuously improving our technology solutions.
                                            The hybrid PB is highly complementary to the PB3 by providing the Company with additional
                                            ways to address a broader spectrum of customer deployment needs, including operating in low-wave
                                            environments, with the potential for greater system integration within each customer project.
                                            The hybrid PB is intended for deployments for which the PB3 is not optimal, including shorter
                                            term missions and low wave environments. In addition, we have future plans to integrate PB3
                                            and WAM-V&#174; capabilities, including the possibility of adding recharging capabilities
                                            to our PB3&#8217;s, and MDAS capabilities to our WAM-Vs&#174;, thus extending our reach and
                                            providing both fixed and mobile MDAS offerings to our customers.</span></td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0.5in; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company has also finished the development of a subsea battery system that is complementary 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. Ideal for many remote offshore customer applications, these subsea battery systems
are designed to be safe, high performance, cost-efficient, and quickly deployable.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0.5in; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Our
WAM-Vs&#174; are easily and economically shipped via land, air, or sea, and their modular design enables us to quickly reduce their size
for storage or shipment. The optional folding features further reduces the footprint by as much as 75% and as a result, a 20&#8217; container
can hold four 16 foot WAM-Vs&#174;. To integrate our solutions and add roaming as an option or enhancement to our MDAS, we are advancing
developments to further integrate MDAS into the WAM-V&#174; platform and develop additional autonomy capabilities.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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">Focus
                                            sales and marketing efforts in global markets. While we are marketing our products and services
                                            globally, we have focused on several key markets and applications, including U.S. and foreign
                                            defense and security applications with our MDAS offering; subsea power for oil and gas; and
                                            the hydrographic survey market in the U.S., Europe, Canada and Australia with regard to our WAM-Vs&#174;.
                                            We believe that each of these areas has demand for our solutions, sizable end market opportunities,
                                            and high levels of industrialization and economic development. We have an office in Houston,
                                            Texas that enables us to further support our customers and strengthen our dialogue with our
                                            solution partners. During fiscal 2022, we added an office in Richmond, California through
                                            our acquisition of MAR. During fiscal 2022, we also further streamlined our global operation
                                            by selecting to work with partners in active offshore markets, such as the North Sea. We
                                            are in active discussions with potential partners in North and South America, the Caribbean,
                                            Southeast Asia and West Africa. We are also participating in a global study for a major oil
                                            and gas operator to use our PowerBuoys&#174; to help reduce their carbon footprint, with applications
                                            in Gulf of Mexico, the North Sea, and Asia-Pacific.</span></td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0.5in; text-align: justify; text-indent: -0.25in"><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-top: 0pt; margin-bottom: 0pt; margin-left: 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%; 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">Expand
                                            our relationships in key market areas through strategic partnerships and collaborations.
                                            We believe that strategic partners are an important part of expanding visibility to our 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. 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, including, for example, our acquisition of 3Dent and
                                            MAR.</span></td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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">Partner
                                            with fabrication, deployment and service support. 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.
                                            We believe this domestically 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-top: 0pt; margin-bottom: 0pt; margin-left: 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">Survey
                                            and security market applications. With the addition of our WAM-V&#174; products, we are able
                                            to increase our ability to lease vehicles specifically to support shoreline and offshore
                                            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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">During
the first three months ending July 31, 2022, the Company incurred a net loss of approximately $5.9 million and used cash in operations
of approximately $5.1 million. The Company has continued to make investments in ongoing product development efforts in anticipation of
future growth, including its acquisition of MAR. 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, 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. Management believes the Company&#8217;s cash balance at July 31, 2022 of $9.4 million and marketable securities balance
of $42.7 million is sufficient to fund its planned operations through at least September 2023.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>At
the Market Offering Agreements: </i>On November 20, 2020, the Company entered into an At the Market Offering Agreement with AGP (the
&#8220;2020 ATM Facility&#8221;), having capacity up to $100.0 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 $50.0 million. From inception of the 2020 ATM Facility
through July 31, 2021, the Company had 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, none of which has been sold to date.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Equity
Line Common Stock Purchase Agreements: </i>On September 18, 2020, 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 $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 the outstanding common stock on the date of the agreement. Through July 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 with approximately $1.0 million remaining on the facility as of July 31, 2022.</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">&#160;</span></p>


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<p style="font: 10pt Times New Roman, Times, Serif; text-align: center; 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">As
of July 31, 2022, the Company&#8217;s backlog was $0.3 million. Our backlog includes 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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 progress towards completion of our customer contracts over time, 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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, 2022. There were
no material changes to our critical accounting estimates or accounting policies during the three months ended July 31, 2022.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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 the adoption of ASU 2016-13 will have on its consolidated financial statements.</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">&#160;</span></p>


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<p style="font: 10pt Times New Roman, Times, Serif; text-align: center; margin-top: 0pt; margin-bottom: 0pt"><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; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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
related to open contracts as of July 31, 2022 and 2021.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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 or labor hour incurred 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 exceeds revenues, the Company recognizes the loss immediately.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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 three-month periods ended July 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">As
of July 31, 2022, the Company&#8217;s total remaining performance obligations, also referred to as backlog, totaled $0.3 million. The
Company expects to recognize approximately 100%, or $0.3 million, of the remaining performance obligations as revenue over the next twelve
months.</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">&#160;</span></p>


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<p style="font: 10pt Times New Roman, Times, Serif; text-align: center; 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-top: 0pt; margin-bottom: 0pt; margin-left: 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&#174; 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&#174; 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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 three months ended July 31, 2022 and 2021 was immaterial.</span></p>

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


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

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">For the three months ended July 31, 2022 and 2021,
the Company had three and two customers, respectively whose revenues accounted for at least 10% of the Company&#8217;s consolidated revenues.
These revenue accounted for approximately 69% and 88% of the Company&#8217;s total revenue for the respective periods.</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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 three months ended July 31, 2022 and 2021.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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="vertical-align: bottom">
    <td>&#160;</td><td style="font-weight: bold; padding-bottom: 1.5pt">&#160;</td>
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    <td>&#160;</td><td>&#160;</td>
    <td colspan="2">&#160;</td><td>&#160;</td><td>&#160;</td>
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  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
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  <tr style="vertical-align: bottom; background-color: White">
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    <td style="padding-bottom: 2.5pt">&#160;</td><td style="padding-bottom: 2.5pt">&#160;</td>
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<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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-top: 0pt; margin-bottom: 0pt; 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; text-align: center; margin-top: 0pt; margin-bottom: 0pt"><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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Operating
Expenses</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0; text-align: justify; text-indent: 0.5in"><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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify; text-indent: 0.5in"><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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0; text-align: justify; text-indent: 0.5in"><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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify; text-indent: 0.5in"><span 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; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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 marketable securities and interest paid on certain obligations
to third parties.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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 in addition to U.S. dollars. These
foreign-denominated accounts had an aggregate balance of $24,000 as of July 31, 2022 and $0.3 million as of July 31, 2021, compared to
our total cash, cash equivalents, marketable securities, and restricted cash balances of $52.4 million as of July 31, 2022 and $57.7
million  as of April 30, 2022.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">In
addition, a portion of our operations is conducted through our subsidiaries in countries other than the U.S., 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. The Company is in the process of winding down its Australian subsidiary and expects it to be completed by the
end of the second quarter of fiscal 2023. The unrealized gains or losses resulting from foreign currency balances translation are included
in Accumulated Other Comprehensive Loss within Shareholders&#8217; Equity. Foreign currency translation gains and losses are recognized within our Consolidated
Statement of Operations.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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-top: 0pt; margin-bottom: 0pt; 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; text-align: center; margin-top: 0pt; margin-bottom: 0pt"><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; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><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; margin-left: 0"><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-top: 0pt; margin-bottom: 0pt; margin-left: 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; text-align: justify; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>Three
months ended July 31, 2022 compared to the three months ended July 31, 2021</i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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; text-align: justify; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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 July 31, 2022 and 2021.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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="vertical-align: bottom">
    <td>&#160;</td><td style="font-weight: bold; padding-bottom: 1.5pt">&#160;</td>
    <td colspan="6" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center">Three months ended July 31,</td><td style="padding-bottom: 1.5pt; font-weight: bold">&#160;</td></tr>
  <tr style="vertical-align: bottom">
    <td>&#160;</td><td style="font-weight: bold; padding-bottom: 1.5pt">&#160;</td>
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  <tr style="vertical-align: bottom">
    <td>&#160;</td><td>&#160;</td>
    <td colspan="2">&#160;</td><td>&#160;</td><td>&#160;</td>
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  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
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  <tr style="vertical-align: bottom; background-color: White">
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    <td style="border-bottom: Black 1.5pt solid; text-align: left">&#160;</td><td style="border-bottom: Black 1.5pt solid; text-align: right">(5,031</td><td style="padding-bottom: 1.5pt; text-align: left">)</td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
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    <td style="border-bottom: Black 1.5pt solid; text-align: left">&#160;</td><td style="border-bottom: Black 1.5pt solid; text-align: right">(5,852</td><td style="padding-bottom: 1.5pt; text-align: left">)</td><td style="padding-bottom: 1.5pt">&#160;</td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left">&#160;</td><td style="border-bottom: Black 1.5pt solid; text-align: right">(4,120</td><td style="padding-bottom: 1.5pt; text-align: left">)</td></tr>
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    <td style="border-bottom: Black 2.5pt double; text-align: left">$</td><td style="border-bottom: Black 2.5pt double; text-align: right">(5,852</td><td style="padding-bottom: 2.5pt; text-align: left">)</td><td style="padding-bottom: 2.5pt">&#160;</td>
    <td style="border-bottom: Black 2.5pt double; text-align: left">$</td><td style="border-bottom: Black 2.5pt double; text-align: right">(3,079</td><td style="padding-bottom: 2.5pt; text-align: left">)</td></tr>
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<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Revenues
for the three months ended July 31, 2022 and 2021 were $0.7 million and $0.3 million, respectively. The year-over-year increase was primarily
due to higher levels of revenue stemming from the acquisition of MAR which produced $0.3 million in revenue as of July 31, 2022.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Cost
of revenues for the three months ended July 31, 2022 and 2021 were $0.5 million and $0.4 million, respectively. The increase of approximately
$0.1 million over 2021 was mostly due to the acquisition of MAR and their related projects for the three months ended July 31, 2022 which
were not part of the Company during the three months ended July 31, 2021.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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: 0; text-align: justify"><i>Change in fair value of contingent consideration</i></p>

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

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify">The change in fair value of contingent consideration for the three months
ended July 31, 2022 was $131,000 relating to an adjustment of the contingent consideration liability based on actual and forecasted revenues
relating to the MAR acquisition.</p>

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

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Operating
expenses for the three months ended July 31, 2022 and 2021 were $6.3 million and $4.9 million, respectively. The increase of
approximately $1.4 million was the result of an increase in employee related cost of $0.8 million, an increase in product
development and engineering cost of $0.2 million, and an increase in insurance cost of $0.1 million related to the acquisition of
MAR. Additional increases of marketing and travel expense of $0.2 million related to increased travel activity now that the COVID-19
pandemic has waned, thus enabling more travel.</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">&#160;</span></p>


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

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Interest
income for three months ended July 31, 2022 and 2021 were $0.1 million and $20,000, respectively. The increase was directly related to
the marketable securities acquired during the fourth quarter of fiscal 2022.</span></p>

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

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Extinguishment
of Debt</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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 was 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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 $5.9
million and $3.1 million for the three months ended July 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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: 0; text-align: justify">During the three months ended July 31, 2022, net cash
flows used in operating activities was $5.1 million, a decrease of $195,000 compared to net cash used in operating activities during the
three months ended July 31, 2021. This reflects an increase in net loss of $2.8 million, partially offset by a gain on extinguishment
of the PPP loan of $0.9 million and the payment of litigation payable in the prior year of $1.2 million.</p>
<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Net
cash provided by (used in) investing activities</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Net
cash provided by investing activities during the three months ended July 31, 2022 was $6.4 million, compared to $7,000 cash used for
investing activities during the three months ended July 31, 2021. The increase in net cash provided by investing activities was primarily
due to the redemption of marketable securities during the three months ended July 31, 2022.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Net
cash provided by financing activities</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Net
cash provided by financing activities during the three months ended July 31, 2022 and July 31, 2021 was zero.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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 three months ended July 31, 2021.
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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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. As of July 31, 2022, our aggregate revenues were $0.7 million, our aggregate net losses were $5.9 million, our aggregate
net cash used in operating activities was $5.1 million and our accumulated deficit was $259.6 million.</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">&#160;</span></p>


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<p style="font: 10pt Times New Roman, Times, Serif; text-align: center; 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0.5in; 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-top: 0pt; margin-bottom: 0pt; margin-left: 0.5in; 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-top: 0pt; margin-bottom: 0pt; margin-left: 0.5in; 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 COVID-19 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-top: 0pt; margin-bottom: 0pt; margin-left: 0.5in; 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 meet product development, manufacturing and customer delivery deadlines 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;</span></td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0.5in; 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-top: 0pt; margin-bottom: 0pt; margin-left: 0.5in; 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
                                            estimates regarding future expenses, revenues, and capital requirements;</span></td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0.5in; 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-top: 0pt; margin-bottom: 0pt; margin-left: 0.5in; 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-top: 0pt; margin-bottom: 0pt; margin-left: 0.5in; 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 as markets develop, or at
                                            all;</span></td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0.5in; 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 establish relationships with our existing and future strategic partners may not
                                            be successful;</span></td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0.5in; 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-top: 0pt; margin-bottom: 0pt; margin-left: 0.5in; 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-top: 0pt; margin-bottom: 0pt; margin-left: 0.5in; 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-top: 0pt; margin-bottom: 0pt; margin-left: 0.5in; 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-top: 0pt; margin-bottom: 0pt; margin-left: 0.5in; 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,
                                            or restrict the use of our products;</span></td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0.5in; 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 hire and retain key personnel, including senior management, to achieve our business
                                            objectives;</span></td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0.5in; 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-top: 0pt; margin-bottom: 0pt; margin-left: 0.5in; 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-top: 0pt; margin-bottom: 0pt; margin-left: 0.5in; 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: 0; text-align: justify">Our business is capital intensive, and through July
31, 2022, we have been funding our business principally through sales of our securities. As of July 31, 2022, our cash and cash equivalents,
restricted cash, and marketable securities balance was $52.4 million and we expect to fund our business with this amount and, to a limited
extent, with our revenues. Management believes the Company&#8217;s current cash and cash equivalents, and marketable securities, are sufficient
to fund its planned expenditures through at least September, 2023.</p>
<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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-top: 0pt; margin-bottom: 0pt; 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; text-align: center; margin-top: 0pt; margin-bottom: 0pt"><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="a_010"></span>Item 3.</b></span> <span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK</b></span></p>



<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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="a_011"></span>Item 4.</b></span> <span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>CONTROLS AND PROCEDURES</b></span></p>



<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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 Chief Financial Officer, evaluated the effectiveness
of the design and operation of our disclosure controls and procedures as of July 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 July 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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 July 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-top: 0pt; margin-bottom: 0pt; 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; text-align: center; margin-top: 0pt; margin-bottom: 0pt"><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; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><span id="a_012"></span>PART
II &#8212; OTHER INFORMATION</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>&#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="a_013"></span>Item 1.</b></span> <span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>LEGAL PROCEEDINGS</i></b></span></p>



<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 2pt; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">For
information on matters in dispute, see Note 13 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-top: 0pt; margin-bottom: 0pt; margin-left: 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="a_014"></span>Item 1A.</b></span> <span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>RISK FACTORS</i></b></span></p>



<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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, 2022 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 13, 2022.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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 $5.9 million during the first three months of fiscal
year 2023 and $3.1 million in fiscal year 2022. As of July 31, 2022, we had an accumulated deficit of $259.6 million. To date, our activities
have consisted primarily of activities related to the development and testing of our technologies and our PowerBuoy&#174;. Thus, 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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="a_015"></span>Item 2.</b></span> <span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS</i></b></span></p>



<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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="a_016"></span>Item 3.</b></span> <span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>DEFAULTS UPON SENIOR SECURITIES</i></b></span></p>



<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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="a_017"></span>Item 4.</b></span> <span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>MINE SAFETY DISCLOSURES</i></b></span></p>



<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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="a_018"></span>Item 5.</b></span> <span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>OTHER INFORMATION</i></b></span></p>



<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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; text-align: center; margin-top: 0pt; margin-bottom: 0pt"><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; text-align: center; margin-top: 0pt; margin-bottom: 0pt"><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="a_019"></span>Item 6.</b></span> <span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>EXHIBIT INDEX</i></b></span></p>



<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0"><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: 0.6in; 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; width: 0.4in"><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; 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">
    <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; 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">32.1</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="ex32-1.htm">Certification of Chief Executive Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002</a></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>
    <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">&#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">32.2</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="ex32-2.htm">Certification of Chief Financial Officer pursuant to Section 906 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; 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">
    <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">101</span></td>
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provided in Item 601(b)(32)(ii) of Regulation S-K, this exhibit shall not be deemed to be &#8220;filed&#8221; or part of a registration
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>
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provided in Rule 406T of Regulation S-T, this exhibit shall not be deemed &#8220;filed&#8221; or a part of a registration 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>
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<p style="font: 10pt Times New Roman, Times, Serif; text-align: center; margin-top: 0pt; margin-bottom: 0pt"><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; text-align: center; margin-top: 0pt; margin-bottom: 0pt"><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; 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-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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:
    September 12, 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>
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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">Date:
    September 12, 2022</span></td>
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    <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 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>
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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">Robert
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  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
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<p style="font: 10pt Times New Roman, Times, Serif; text-align: center; margin-top: 0pt; margin-bottom: 0pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>


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<DOCUMENT>
<TYPE>EX-31.1
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<FILENAME>ex31-1.htm
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<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>&nbsp;</B></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
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; 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">I,
Philipp Stratmann, certify that:</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.25in; text-align: justify; text-indent: -0.25in"><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">
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    <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"><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"><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"><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"><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"><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"><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>
  <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; 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"><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"><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"><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"><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"><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"><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"><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"><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"><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 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 other persons
    performing the equivalent functions):</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; 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"><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"><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"><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 0.25in; text-align: justify; text-indent: -0.25in"><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: bottom">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 50%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Date:
    September 12, 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: bottom">
    <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="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: bottom">
    <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: bottom">
    <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; text-align: justify"><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>
</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"><B>&nbsp;</B></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
31.2</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>&nbsp;</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>CERTIFICATION
PURSUANT TO SECTION 302 OF SARBANES-OXLEY ACT</B></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"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">I,
Robert Powers, certify that:</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.25in; text-align: justify; text-indent: -0.25in"><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"><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"><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"><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"><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"><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"><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"><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>
  <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; 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"><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"><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"><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"><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"><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"><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"><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"><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"><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 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 other persons
    performing the equivalent functions):</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; 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"><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"><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"><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 0.25in; text-align: justify; text-indent: -0.25in"><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: bottom">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 50%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Date:
    September 12, 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: bottom">
    <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="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 Powers</I></FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <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
    Powers</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <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; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>


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    <!-- Field: /Page -->

<P STYLE="text-align: center; font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

</BODY>
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</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; text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>&nbsp;</B></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
32.1</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"><B>&nbsp;</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>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; 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"></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">In connection with the Quarterly Report on Form 10-Q
of Ocean Power Technologies, Inc. (the &ldquo;Company&rdquo;) for the period ended July 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:</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"></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.25in; text-align: justify; text-indent: -0.25in"><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"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(1)</FONT></TD>
    <TD STYLE="text-align: justify; font: 10pt Times New Roman, Times, Serif"><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"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: justify; 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"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(2)</FONT></TD>
    <TD STYLE="text-align: justify; font: 10pt Times New Roman, Times, Serif"><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 0.25in; text-align: justify; text-indent: -0.25in"><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: bottom">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 50%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Date:
    September 12, 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: bottom">
    <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="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: bottom">
    <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: bottom">
    <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; 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>


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    <!-- Field: /Page -->

<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-top: 0pt; margin-bottom: 0pt; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

</BODY>
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</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"><B>&nbsp;</B></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; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>&nbsp;</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>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; 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"></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">In connection with the Quarterly Report on Form 10-Q
of Ocean Power Technologies, Inc. (the &ldquo;Company&rdquo;) for the period ended July 31, 2022, as filed with the Securities and Exchange
Commission on the date hereof (the &ldquo;Report&rdquo;), the undersigned, Robert 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:</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"></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.25in; text-align: justify; text-indent: -0.25in"><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"><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"><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"><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 0.25in; text-align: justify; text-indent: -0.25in"><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: bottom">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 50%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Date:
    September 12, 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: bottom">
    <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="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 Powers</I></FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <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
    Powers</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <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; 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>


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<DOCUMENT>
<TYPE>EX-101.SCH
<SEQUENCE>6
<FILENAME>optt-20220731.xsd
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    <element id="OPTT_StockPurchaseAgreementMember" name="StockPurchaseAgreementMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_AspireCapitalFundLLCMember" name="AspireCapitalFundLLCMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_CheckingAndSavingsAccountsMember" name="CheckingAndSavingsAccountsMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_RestrictedCashAndSecurityAgreementsMember" name="RestrictedCashAndSecurityAgreementsMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_SantanderBankMember" name="SantanderBankMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_LetterOneMember" name="LetterOneMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_LetterTwoMember" name="LetterTwoMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_AugustTwentyTwentyMember" name="AugustTwentyTwentyMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_ForeignFinancialInstitutionsMember" name="ForeignFinancialInstitutionsMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_ThreeAndTwoCustomersMember" name="ThreeAndTwoCustomersMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_CorporateBondsMember" name="CorporateBondsMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_GovernmentBondsandNotesMember" name="GovernmentBondsandNotesMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
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    <element id="OPTT_OfficeFurnitureAndEquipmentMember" name="OfficeFurnitureAndEquipmentMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_MonroeTownshipMember" name="MonroeTownshipMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_ThreeDentAcquisitionMember" name="ThreeDentAcquisitionMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
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    <element id="OPTT_CommonWarrantsMember" name="CommonWarrantsMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
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    <element id="OPTT_StockIssuedDuringPeriodSharesCanBeIssuedBasedUponOutstandingPercentage" name="StockIssuedDuringPeriodSharesCanBeIssuedBasedUponOutstandingPercentage" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
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    <element id="OPTT_ValarisMember" name="ValarisMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
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</schema>
</XBRL>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-101.CAL
<SEQUENCE>7
<FILENAME>optt-20220731_cal.xml
<DESCRIPTION>XBRL CALCULATION FILE
<TEXT>
<XBRL>
<?xml version="1.0" encoding="US-ASCII" standalone="no"?>
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<TYPE>EX-101.DEF
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_LetterTwoMember" xlink:to="OPTT_LetterTwoMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_LetterTwoMember_lbl" xml:lang="en-US">Letter 2 [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.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-20220731.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-20220731.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/srt-2022.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-20220731.xsd#OPTT_ThreeAndTwoCustomersMember" xlink:label="OPTT_ThreeAndTwoCustomersMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_ThreeAndTwoCustomersMember" xlink:to="OPTT_ThreeAndTwoCustomersMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_ThreeAndTwoCustomersMember_lbl" xml:lang="en-US">Three and Two Customers [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentTypeAxis" xlink:label="us-gaap_InvestmentTypeAxis" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentTypeAxis" xlink:to="us-gaap_InvestmentTypeAxis_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InvestmentTypeAxis_lbl" xml:lang="en-US">Investment Type [Axis]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220731.xsd#OPTT_CorporateBondsMember" xlink:label="OPTT_CorporateBondsMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_CorporateBondsMember" xlink:to="OPTT_CorporateBondsMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_CorporateBondsMember_lbl" xml:lang="en-US">Corporate Bonds [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220731.xsd#OPTT_GovernmentBondsandNotesMember" xlink:label="OPTT_GovernmentBondsandNotesMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_GovernmentBondsandNotesMember" xlink:to="OPTT_GovernmentBondsandNotesMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_GovernmentBondsandNotesMember_lbl" xml:lang="en-US">Government Bonds and Notes [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220731.xsd#OPTT_GovernmentAgencyMember" xlink:label="OPTT_GovernmentAgencyMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_GovernmentAgencyMember" xlink:to="OPTT_GovernmentAgencyMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_GovernmentAgencyMember_lbl" xml:lang="en-US">Government Agency [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220731.xsd#OPTT_AccuredInterestMember" xlink:label="OPTT_AccuredInterestMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_AccuredInterestMember" xlink:to="OPTT_AccuredInterestMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_AccuredInterestMember_lbl" xml:lang="en-US">Accured Interest [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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-20220731.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-20220731.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/srt-2022.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-20220731.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/2022/elts/us-gaap-2022.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-20220731.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-20220731.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-20220731.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-20220731.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/2022/elts/us-gaap-2022.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-20220731.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="https://xbrl.fasb.org/srt/2022/elts/srt-2022.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="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ChiefExecutiveOfficerMember" xlink:label="srt_ChiefExecutiveOfficerMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="srt_ChiefExecutiveOfficerMember" xlink:to="srt_ChiefExecutiveOfficerMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="srt_ChiefExecutiveOfficerMember_lbl" xml:lang="en-US">Chief Executive Officer [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220731.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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-20220731.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="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.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="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RestrictedStockMember" xlink:label="us-gaap_RestrictedStockMember" />
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      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NewJerseyDivisionOfTaxationMember" xlink:label="us-gaap_NewJerseyDivisionOfTaxationMember" />
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      <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>
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      <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/2022/dei-2022.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/2022/dei-2022.xsd#dei_AmendmentDescription" xlink:label="dei_AmendmentDescription" />
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      <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>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_DocumentAnnualReport" xlink:label="dei_DocumentAnnualReport" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentAnnualReport" xlink:to="dei_DocumentAnnualReport_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentAnnualReport_lbl" xml:lang="en-US">Document Annual Report</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_DocumentQuarterlyReport" xlink:label="dei_DocumentQuarterlyReport" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentQuarterlyReport" xlink:to="dei_DocumentQuarterlyReport_lbl" xlink:type="arc" />
      <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>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_DocumentTransitionReport" xlink:label="dei_DocumentTransitionReport" />
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      <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/2022/dei-2022.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>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_DocumentShellCompanyEventDate" xlink:label="dei_DocumentShellCompanyEventDate" />
      <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/2022/dei-2022.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/2022/dei-2022.xsd#dei_DocumentPeriodEndDate" xlink:label="dei_DocumentPeriodEndDate" />
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      <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/2022/dei-2022.xsd#dei_DocumentFiscalPeriodFocus" xlink:label="dei_DocumentFiscalPeriodFocus" />
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      <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>
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      <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>
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      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityFileNumber" xlink:label="dei_EntityFileNumber" />
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      <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>
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      <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>
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      <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>
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      <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>
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      <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>
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      <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>
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      <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>
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      <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>
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      <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>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_PreCommencementTenderOffer" xlink:label="dei_PreCommencementTenderOffer" />
      <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/2022/dei-2022.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/2022/dei-2022.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/2022/dei-2022.xsd#dei_NoTradingSymbolFlag" xlink:label="dei_NoTradingSymbolFlag" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_NoTradingSymbolFlag" xlink:to="dei_NoTradingSymbolFlag_lbl" xlink:type="arc" />
      <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/2022/dei-2022.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/2022/dei-2022.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/2022/dei-2022.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/2022/dei-2022.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/2022/dei-2022.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>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_AuditedAnnualFinancialStatements" xlink:label="dei_AuditedAnnualFinancialStatements" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_AuditedAnnualFinancialStatements" xlink:to="dei_AuditedAnnualFinancialStatements_lbl" xlink:type="arc" />
      <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/2022/dei-2022.xsd#dei_EntityWellKnownSeasonedIssuer" xlink:label="dei_EntityWellKnownSeasonedIssuer" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityWellKnownSeasonedIssuer" xlink:to="dei_EntityWellKnownSeasonedIssuer_lbl" xlink:type="arc" />
      <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/2022/dei-2022.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/2022/dei-2022.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/2022/dei-2022.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/2022/dei-2022.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/2022/dei-2022.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/2022/dei-2022.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/2022/dei-2022.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/2022/dei-2022.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/2022/dei-2022.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/2022/dei-2022.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/2022/dei-2022.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/2022/dei-2022.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/2022/dei-2022.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/2022/dei-2022.xsd#dei_DocumentsIncorporatedByReferenceTextBlock" xlink:label="dei_DocumentsIncorporatedByReferenceTextBlock" />
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      <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>
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      <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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_Goodwill" xlink:label="us-gaap_Goodwill" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_Goodwill" xlink:to="us-gaap_Goodwill_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_Goodwill_lbl" xml:lang="en-US">Goodwill</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_Assets" xlink:label="us-gaap_Assets" />
      <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/2022/elts/us-gaap-2022.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>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LiabilitiesCurrentAbstract" xlink:label="us-gaap_LiabilitiesCurrentAbstract" />
      <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" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LiabilitiesCurrentAbstract_lbl" xml:lang="en-US">Current liabilities:</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccountsPayableCurrent" xlink:label="us-gaap_AccountsPayableCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AccountsPayableCurrent" xlink:to="us-gaap_AccountsPayableCurrent_lbl" xlink:type="arc" />
      <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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.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, current portion</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.xsd#us-gaap_DeferredIncomeTaxLiabilitiesNet" xlink:label="us-gaap_DeferredIncomeTaxLiabilitiesNet" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DeferredIncomeTaxLiabilitiesNet" xlink:to="us-gaap_DeferredIncomeTaxLiabilitiesNet_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DeferredIncomeTaxLiabilitiesNet_lbl" xml:lang="en-US">Deferred tax liability</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent" xlink:label="us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent" xlink:to="us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent_lbl" xml:lang="en-US">Contingent liabilities, less current portion</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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 13)</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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 55,921,880 shares and 55,905,213 shares, respectively; outstanding 55,898,528 shares and 55,881,861 shares, respectively</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.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; 23,352 shares</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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 margin (loss)</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1" xlink:label="us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1" xlink:to="us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1_lbl" xml:lang="en-US">Change in fair value of contingent consideration</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.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/label" xlink:label="us-gaap_OperatingExpenses_lbl" xml:lang="en-US">Operating expenses</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingIncomeLoss" xlink:label="us-gaap_OperatingIncomeLoss" />
      <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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.xsd#us-gaap_EarningsPerShareBasic" xlink:label="us-gaap_EarningsPerShareBasic" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EarningsPerShareBasic" xlink:to="us-gaap_EarningsPerShareBasic_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_EarningsPerShareBasic_lbl" xml:lang="en-US">Basic and diluted net loss per share</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:label="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:to="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_lbl" xml:lang="en-US">Weighted average shares used to compute basic and diluted net loss per 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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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 balance, value</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.xsd#us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross" xlink:label="us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross" xlink:to="us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross_lbl" xml:lang="en-US">Common stock issued upon vesting of restricted stock</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross" xlink:label="us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross" xlink:to="us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross_lbl" xml:lang="en-US">Common stock issued upon exercise of stock options, shares</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.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 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 balance, value</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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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="optt-20220731.xsd#OPTT_AmortizationOfPremiumOnMarketableSecurities" xlink:label="OPTT_AmortizationOfPremiumOnMarketableSecurities" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_AmortizationOfPremiumOnMarketableSecurities" xlink:to="OPTT_AmortizationOfPremiumOnMarketableSecurities_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_AmortizationOfPremiumOnMarketableSecurities_lbl" xml:lang="en-US">Amortization of premium on marketable securities</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/2022/elts/us-gaap-2022.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">Compensation expense related to equity compensation</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220731.xsd#OPTT_ChangeInContingentLiabilityConsideration" xlink:label="OPTT_ChangeInContingentLiabilityConsideration" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_ChangeInContingentLiabilityConsideration" xlink:to="OPTT_ChangeInContingentLiabilityConsideration_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="OPTT_ChangeInContingentLiabilityConsideration_lbl" xml:lang="en-US">Change in contingent liability consideration</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.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:</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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="optt-20220731.xsd#OPTT_IncreaseDecreaseInAccruedExpenses" xlink:label="OPTT_IncreaseDecreaseInAccruedExpenses" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_IncreaseDecreaseInAccruedExpenses" xlink:to="OPTT_IncreaseDecreaseInAccruedExpenses_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="OPTT_IncreaseDecreaseInAccruedExpenses_lbl" xml:lang="en-US">Accrued expenses</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220731.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 right of use lease liability</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.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-20220731.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/label" 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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.xsd#us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities" xlink:label="us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities" xlink:to="us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities_lbl" xml:lang="en-US">Redemptions of marketable securities</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PaymentsToAcquireMarketableSecurities" xlink:label="us-gaap_PaymentsToAcquireMarketableSecurities" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PaymentsToAcquireMarketableSecurities" xlink:to="us-gaap_PaymentsToAcquireMarketableSecurities_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_PaymentsToAcquireMarketableSecurities_lbl" xml:lang="en-US">Purchase of marketable securities</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xlink:label="us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xlink:to="us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_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/2022/elts/us-gaap-2022.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 provided by (used in) investing activities</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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 increase / (decrease) in cash, cash equivalents and restricted cash</link:label>
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      <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>
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      <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>
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      <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>
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      <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>
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      <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-20220731.xsd#OPTT_DisclosureAccountReceivableContractAssetsAndContractLiabilitiesAbstract" xlink:label="OPTT_DisclosureAccountReceivableContractAssetsAndContractLiabilitiesAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_DisclosureAccountReceivableContractAssetsAndContractLiabilitiesAbstract" xlink:to="OPTT_DisclosureAccountReceivableContractAssetsAndContractLiabilitiesAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_DisclosureAccountReceivableContractAssetsAndContractLiabilitiesAbstract_lbl" xml:lang="en-US">Account Receivable Contract Assets And Contract Liabilities</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220731.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, Contract Assets and Contract Liabilities</link:label>
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InventoryDisclosureAbstract" xlink:to="us-gaap_InventoryDisclosureAbstract_lbl" xlink:type="arc" />
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      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InventoryDisclosureTextBlock" xlink:label="us-gaap_InventoryDisclosureTextBlock" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InventoryDisclosureTextBlock" xlink:to="us-gaap_InventoryDisclosureTextBlock_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_InventoryDisclosureTextBlock_lbl" xml:lang="en-US">Inventory</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DeferredCostsCapitalizedPrepaidAndOtherAssetsDisclosureAbstract" xlink:label="us-gaap_DeferredCostsCapitalizedPrepaidAndOtherAssetsDisclosureAbstract" />
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      <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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock_lbl" xml:lang="en-US">Property and Equipment, net</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220731.xsd#OPTT_DisclosureLeasesAbstract" xlink:label="OPTT_DisclosureLeasesAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_DisclosureLeasesAbstract" xlink:to="OPTT_DisclosureLeasesAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_DisclosureLeasesAbstract_lbl" xml:lang="en-US">Leases</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LesseeOperatingLeasesTextBlock" xlink:label="us-gaap_LesseeOperatingLeasesTextBlock" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LesseeOperatingLeasesTextBlock" xlink:to="us-gaap_LesseeOperatingLeasesTextBlock_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_LesseeOperatingLeasesTextBlock_lbl" xml:lang="en-US">Leases</link:label>
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PayablesAndAccrualsAbstract_lbl" xml:lang="en-US">Payables and Accruals [Abstract]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccountsPayableAndAccruedLiabilitiesDisclosureTextBlock" xlink:label="us-gaap_AccountsPayableAndAccruedLiabilitiesDisclosureTextBlock" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AccountsPayableAndAccruedLiabilitiesDisclosureTextBlock" xlink:to="us-gaap_AccountsPayableAndAccruedLiabilitiesDisclosureTextBlock_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AccountsPayableAndAccruedLiabilitiesDisclosureTextBlock_lbl" xml:lang="en-US">Accrued Expenses</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220731.xsd#OPTT_DisclosureWarrantsAbstract" xlink:label="OPTT_DisclosureWarrantsAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_DisclosureWarrantsAbstract" xlink:to="OPTT_DisclosureWarrantsAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_DisclosureWarrantsAbstract_lbl" xml:lang="en-US">Warrants</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220731.xsd#OPTT_WarrantDisclosureTextBlock" xlink:label="OPTT_WarrantDisclosureTextBlock" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_WarrantDisclosureTextBlock" xlink:to="OPTT_WarrantDisclosureTextBlock_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="OPTT_WarrantDisclosureTextBlock_lbl" xml:lang="en-US">Warrants</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtDisclosureAbstract" xlink:label="us-gaap_DebtDisclosureAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DebtDisclosureAbstract" xlink:to="us-gaap_DebtDisclosureAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DebtDisclosureAbstract_lbl" xml:lang="en-US">Debt Disclosure [Abstract]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtDisclosureTextBlock" xlink:label="us-gaap_DebtDisclosureTextBlock" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DebtDisclosureTextBlock" xlink:to="us-gaap_DebtDisclosureTextBlock_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DebtDisclosureTextBlock_lbl" xml:lang="en-US">Paycheck Protection Program Loan</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract" xlink:label="us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract" />
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      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock" xlink:label="us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock" />
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      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueDisclosuresTextBlock" xlink:label="us-gaap_FairValueDisclosuresTextBlock" />
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EarningsPerSharePolicyTextBlock" xlink:to="us-gaap_EarningsPerSharePolicyTextBlock_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_EarningsPerSharePolicyTextBlock_lbl" xml:lang="en-US">Net Loss per Common Share</link:label>
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock" xlink:to="us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_lbl" xlink:type="arc" />
      <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:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleOfCashAndCashEquivalentsTableTextBlock" xlink:to="us-gaap_ScheduleOfCashAndCashEquivalentsTableTextBlock_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ScheduleOfCashAndCashEquivalentsTableTextBlock_lbl" xml:lang="en-US">Schedule of Cash and Cash Equivalents</link:label>
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleOfRestrictedCashAndCashEquivalentsTextBlock" xlink:to="us-gaap_ScheduleOfRestrictedCashAndCashEquivalentsTextBlock_lbl" xlink:type="arc" />
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      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_UnrealizedGainLossOnInvestmentsTableTextBlock" xlink:label="us-gaap_UnrealizedGainLossOnInvestmentsTableTextBlock" />
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      <link:loc xlink:type="locator" xlink:href="optt-20220731.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfInventoryCurrentTableTextBlock" xlink:label="us-gaap_ScheduleOfInventoryCurrentTableTextBlock" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleOfInventoryCurrentTableTextBlock" xlink:to="us-gaap_ScheduleOfInventoryCurrentTableTextBlock_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ScheduleOfInventoryCurrentTableTextBlock_lbl" xml:lang="en-US">Schedule of Inventory</link:label>
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      <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>
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      <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>
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      <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-20220731.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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>
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      <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/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" />
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      <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>
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShortTermInvestments" xlink:to="us-gaap_ShortTermInvestments_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShortTermInvestments_lbl" xml:lang="en-US">Short-term investments</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:label="us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:to="us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_lbl" xml:lang="en-US">Offering amount capacity</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.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 initial public offering</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction" xlink:label="us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction" xlink:to="us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction_lbl" xml:lang="en-US">Number of common stock shares sold</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SaleOfStockConsiderationReceivedPerTransaction" xlink:label="us-gaap_SaleOfStockConsiderationReceivedPerTransaction" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SaleOfStockConsiderationReceivedPerTransaction" xlink:to="us-gaap_SaleOfStockConsiderationReceivedPerTransaction_lbl" xlink:type="arc" />
      <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/2022/elts/us-gaap-2022.xsd#us-gaap_SaleOfStockPricePerShare" xlink:label="us-gaap_SaleOfStockPricePerShare" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SaleOfStockPricePerShare" xlink:to="us-gaap_SaleOfStockPricePerShare_lbl" xlink:type="arc" />
      <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-20220731.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>
      <link:loc xlink:type="locator" xlink:href="optt-20220731.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-20220731.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-20220731.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-20220731.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="optt-20220731.xsd#OPTT_SaleOfStockConsiderationReceivedPerTransactionRemaining" xlink:label="OPTT_SaleOfStockConsiderationReceivedPerTransactionRemaining" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_SaleOfStockConsiderationReceivedPerTransactionRemaining" xlink:to="OPTT_SaleOfStockConsiderationReceivedPerTransactionRemaining_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="OPTT_SaleOfStockConsiderationReceivedPerTransactionRemaining_lbl" xml:lang="en-US">Proceeds from issuance or sale of equity, net of issuance costs</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/2022/elts/us-gaap-2022.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, restricted cash and restricted cash equivalents</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryTable" xlink:label="us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryTable" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryTable" xlink:to="us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryTable_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryTable_lbl" xml:lang="en-US">Investment Income [Table]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems" xlink:label="us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems" xlink:to="us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems_lbl" xml:lang="en-US">Net Investment Income [Line Items]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MoneyMarketFundsAtCarryingValue" xlink:label="us-gaap_MoneyMarketFundsAtCarryingValue" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_MoneyMarketFundsAtCarryingValue" xlink:to="us-gaap_MoneyMarketFundsAtCarryingValue_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_MoneyMarketFundsAtCarryingValue_lbl" xml:lang="en-US">Market Value</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_UnrealizedGainLossOnInvestments" xlink:label="us-gaap_UnrealizedGainLossOnInvestments" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_UnrealizedGainLossOnInvestments" xlink:to="us-gaap_UnrealizedGainLossOnInvestments_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_UnrealizedGainLossOnInvestments_lbl" xml:lang="en-US">Unrealized Gains (Losses)</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentOwnedAtCost" xlink:label="us-gaap_InvestmentOwnedAtCost" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentOwnedAtCost" xlink:to="us-gaap_InvestmentOwnedAtCost_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InvestmentOwnedAtCost_lbl" xml:lang="en-US">Total Cost</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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-20220731.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:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AlternativeInvestment" xlink:label="us-gaap_AlternativeInvestment" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AlternativeInvestment" xlink:to="us-gaap_AlternativeInvestment_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AlternativeInvestment_lbl" xml:lang="en-US">Investment securities</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentIncomeNetAmortizationOfDiscountAndPremium" xlink:label="us-gaap_InvestmentIncomeNetAmortizationOfDiscountAndPremium" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentIncomeNetAmortizationOfDiscountAndPremium" xlink:to="us-gaap_InvestmentIncomeNetAmortizationOfDiscountAndPremium_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InvestmentIncomeNetAmortizationOfDiscountAndPremium_lbl" xml:lang="en-US">Discount and premium</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TradingSecuritiesDebtAmortizedCost" xlink:label="us-gaap_TradingSecuritiesDebtAmortizedCost" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_TradingSecuritiesDebtAmortizedCost" xlink:to="us-gaap_TradingSecuritiesDebtAmortizedCost_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_TradingSecuritiesDebtAmortizedCost_lbl" xml:lang="en-US">Investment owned at cost</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskPercentage1" xlink:label="us-gaap_ConcentrationRiskPercentage1" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ConcentrationRiskPercentage1" xlink:to="us-gaap_ConcentrationRiskPercentage1_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ConcentrationRiskPercentage1_lbl" xml:lang="en-US">Concentration risk percentage</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EmployeeBenefitsAndShareBasedCompensation" xlink:label="us-gaap_EmployeeBenefitsAndShareBasedCompensation" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EmployeeBenefitsAndShareBasedCompensation" xlink:to="us-gaap_EmployeeBenefitsAndShareBasedCompensation_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_EmployeeBenefitsAndShareBasedCompensation_lbl" xml:lang="en-US">Share based compensation</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.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-20220731.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/2022/elts/us-gaap-2022.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 earnings per share</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_DisclosureAccountReceivableContractAssetsAndContractLiabilitiesAbstract" xlink:to="OPTT_DisclosureAccountReceivableContractAssetsAndContractLiabilitiesAbstract_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="OPTT_DisclosureAccountReceivableContractAssetsAndContractLiabilitiesAbstract_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_DisclosureAccountReceivableContractAssetsAndContractLiabilitiesAbstract" xlink:to="OPTT_DisclosureAccountReceivableContractAssetsAndContractLiabilitiesAbstract_3_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="OPTT_DisclosureAccountReceivableContractAssetsAndContractLiabilitiesAbstract_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/2022/elts/us-gaap-2022.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/negatedPeriodEndLabel" 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:loc xlink:type="locator" xlink:href="optt-20220731.xsd#OPTT_RevenueRecognizedAndNotBilledAsOfEndOfPeriod" xlink:label="OPTT_RevenueRecognizedAndNotBilledAsOfEndOfPeriod" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_RevenueRecognizedAndNotBilledAsOfEndOfPeriod" xlink:to="OPTT_RevenueRecognizedAndNotBilledAsOfEndOfPeriod_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_RevenueRecognizedAndNotBilledAsOfEndOfPeriod_lbl" xml:lang="en-US">Revenue recognized and not billed as of the end of the period</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220731.xsd#OPTT_IncreaseDecreaseInContractWithCustomerAssets" xlink:label="OPTT_IncreaseDecreaseInContractWithCustomerAssets" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_IncreaseDecreaseInContractWithCustomerAssets" xlink:to="OPTT_IncreaseDecreaseInContractWithCustomerAssets_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="OPTT_IncreaseDecreaseInContractWithCustomerAssets_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/2022/elts/us-gaap-2022.xsd#us-gaap_ContractWithCustomerLiability" xlink:label="us-gaap_ContractWithCustomerLiability" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ContractWithCustomerLiability" xlink:to="us-gaap_ContractWithCustomerLiability_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedPeriodEndLabel" xlink:label="us-gaap_ContractWithCustomerLiability_lbl" xml:lang="en-US">Revenue recognized that was included in the contract liabilities balance as of the beginning of the period</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220731.xsd#OPTT_PaymentsCollectedForWhichRevenueHasNotBeenRecognized" xlink:label="OPTT_PaymentsCollectedForWhichRevenueHasNotBeenRecognized" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_PaymentsCollectedForWhichRevenueHasNotBeenRecognized" xlink:to="OPTT_PaymentsCollectedForWhichRevenueHasNotBeenRecognized_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_PaymentsCollectedForWhichRevenueHasNotBeenRecognized_lbl" xml:lang="en-US">Payments collected for which revenue has not been recognized</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInContractWithCustomerLiability" xlink:to="us-gaap_IncreaseDecreaseInContractWithCustomerLiability_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_IncreaseDecreaseInContractWithCustomerLiability_2_lbl" xml:lang="en-US">Net change in contract liabilities</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InventoryRawMaterials" xlink:label="us-gaap_InventoryRawMaterials" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InventoryRawMaterials" xlink:to="us-gaap_InventoryRawMaterials_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InventoryRawMaterials_lbl" xml:lang="en-US">Raw Materials</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InventoryWorkInProcess" xlink:label="us-gaap_InventoryWorkInProcess" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InventoryWorkInProcess" xlink:to="us-gaap_InventoryWorkInProcess_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InventoryWorkInProcess_lbl" xml:lang="en-US">Work in Process</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InventoryNet" xlink:to="us-gaap_InventoryNet_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_InventoryNet_2_lbl" xml:lang="en-US">Inventory, net</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.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-20220731.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-20220731.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 &amp; marketing</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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">Total other current assets</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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">Remainder of fiscal year 2023</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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">Legal and accounting fees</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.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</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.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-20220731.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.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/2009/role/negatedLabel" xlink:label="us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_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/2022/elts/us-gaap-2022.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="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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-20220731.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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, Unvested, Beginning</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.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, Unvested, Beginning</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.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, Unvested, Granted</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.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, Unvested, Granted</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.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, Unvested, Vested and issued</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.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, Unvested, Vested</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.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/2009/role/negatedLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_lbl" xml:lang="en-US">Number of Shares, Unvested, 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, 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, Unvested, Ending</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220731.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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, number of shares unvested</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.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">Weighted average remaining contractual term</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.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>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions" />
      <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</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.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-20220731.xsd#OPTT_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsUnvestedOutstandingIntrinsicValue" xlink:label="OPTT_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsUnvestedOutstandingIntrinsicValue" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsUnvestedOutstandingIntrinsicValue" xlink:to="OPTT_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsUnvestedOutstandingIntrinsicValue_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsUnvestedOutstandingIntrinsicValue_lbl" xml:lang="en-US">Options, outstanding, intrinsic value</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">Number of restricted shares, granted</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.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/verboseLabel" 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/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable" xlink:label="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable" xlink:to="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_lbl" xml:lang="en-US">Fair Value, Recurring and Nonrecurring [Table]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems" xlink:label="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems" xlink:to="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_lbl" xml:lang="en-US">Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentsFairValueDisclosure" xlink:label="us-gaap_InvestmentsFairValueDisclosure" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentsFairValueDisclosure" xlink:to="us-gaap_InvestmentsFairValueDisclosure_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InvestmentsFairValueDisclosure_lbl" xml:lang="en-US">Fair value of investments</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationContingentConsiderationLiability" xlink:label="us-gaap_BusinessCombinationContingentConsiderationLiability" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_BusinessCombinationContingentConsiderationLiability" xlink:to="us-gaap_BusinessCombinationContingentConsiderationLiability_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_BusinessCombinationContingentConsiderationLiability_lbl" xml:lang="en-US">Contingent liability MAR acquisition amount</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220731.xsd#OPTT_IncreaseDecreaseInContingentLiability" xlink:label="OPTT_IncreaseDecreaseInContingentLiability" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_IncreaseDecreaseInContingentLiability" xlink:to="OPTT_IncreaseDecreaseInContingentLiability_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_IncreaseDecreaseInContingentLiability_lbl" xml:lang="en-US">Decrease in contingent liability</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ContingentConsiderationClassifiedAsEquityFairValueDisclosure" xlink:label="us-gaap_ContingentConsiderationClassifiedAsEquityFairValueDisclosure" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ContingentConsiderationClassifiedAsEquityFairValueDisclosure" xlink:to="us-gaap_ContingentConsiderationClassifiedAsEquityFairValueDisclosure_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ContingentConsiderationClassifiedAsEquityFairValueDisclosure_lbl" xml:lang="en-US">Fair value of contingent consideration</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.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/2022/elts/us-gaap-2022.xsd#us-gaap_LossContingencyDamagesPaidValue" xlink:label="us-gaap_LossContingencyDamagesPaidValue" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LossContingencyDamagesPaidValue" xlink:to="us-gaap_LossContingencyDamagesPaidValue_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LossContingencyDamagesPaidValue_lbl" xml:lang="en-US">Payment of tax on damages</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingLossCarryforwardsTable" xlink:label="us-gaap_OperatingLossCarryforwardsTable" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingLossCarryforwardsTable" xlink:to="us-gaap_OperatingLossCarryforwardsTable_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OperatingLossCarryforwardsTable_lbl" xml:lang="en-US">Operating Loss Carryforwards [Table]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingLossCarryforwardsLineItems" xlink:label="us-gaap_OperatingLossCarryforwardsLineItems" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingLossCarryforwardsLineItems" xlink:to="us-gaap_OperatingLossCarryforwardsLineItems_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OperatingLossCarryforwardsLineItems_lbl" xml:lang="en-US">Operating Loss Carryforwards [Line Items]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingLossCarryforwards" xlink:label="us-gaap_OperatingLossCarryforwards" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingLossCarryforwards" xlink:to="us-gaap_OperatingLossCarryforwards_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OperatingLossCarryforwards_lbl" xml:lang="en-US">Operating loss</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220731.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_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_ProceedFromSaleOfLossCarryforwardsAndTaxCredits_lbl" xml:lang="en-US">Proceed from sale of loss carryforwards and tax credits</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncomeTaxExpenseBenefit" xlink:to="us-gaap_IncomeTaxExpenseBenefit_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IncomeTaxExpenseBenefit_2_lbl" xml:lang="en-US">Income tax benefit</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.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: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_RestrictedCashAndSecurityAgreementsMember" xlink:to="OPTT_RestrictedCashAndSecurityAgreementsMember_doc" xlink:type="arc" />
      <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>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_SantanderBankMember" xlink:to="OPTT_SantanderBankMember_doc" xlink:type="arc" />
      <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_WarrantDisclosureTextBlock" xlink:to="OPTT_WarrantDisclosureTextBlock_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_WarrantDisclosureTextBlock_doc" xml:lang="en-US">Warrant Disclosure [Text Block]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_PreFundedWarrantsMember" xlink:to="OPTT_PreFundedWarrantsMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_PreFundedWarrantsMember_doc" xml:lang="en-US">Pre-funded Warrants [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_CommonWarrantsMember" xlink:to="OPTT_CommonWarrantsMember_doc" xlink:type="arc" />
      <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_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:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_CorporateBondsMember" xlink:to="OPTT_CorporateBondsMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_CorporateBondsMember_doc" xml:lang="en-US">Corporate Bonds [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_GovernmentBondsandNotesMember" xlink:to="OPTT_GovernmentBondsandNotesMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_GovernmentBondsandNotesMember_doc" xml:lang="en-US">Government Bonds and Notes [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_IncreaseDecreaseInAccruedExpenses" xlink:to="OPTT_IncreaseDecreaseInAccruedExpenses_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_IncreaseDecreaseInAccruedExpenses_doc" xml:lang="en-US">Increase decrease in accrued expenses.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_IncreaseDecreaseInLeaseLiability" xlink:to="OPTT_IncreaseDecreaseInLeaseLiability_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_IncreaseDecreaseInLeaseLiability_doc" xml:lang="en-US">Increase decrease in lease liability.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_IncreaseDecreaseInLitigationPayable" xlink:to="OPTT_IncreaseDecreaseInLitigationPayable_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_IncreaseDecreaseInLitigationPayable_doc" xml:lang="en-US">Increase decrease in litigation payable.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_GovernmentAgencyMember" xlink:to="OPTT_GovernmentAgencyMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_GovernmentAgencyMember_doc" xml:lang="en-US">Government Agency [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_AccuredInterestMember" xlink:to="OPTT_AccuredInterestMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_AccuredInterestMember_doc" xml:lang="en-US">Accured Interest [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>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_NonVestedStockMember" xlink:to="OPTT_NonVestedStockMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_NonVestedStockMember_doc" xml:lang="en-US">Non-vested Stock [Member]</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_PerformanceStockOptionsMember" xlink:to="OPTT_PerformanceStockOptionsMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_PerformanceStockOptionsMember_doc" xml:lang="en-US">Performance Stock Options [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220731.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_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_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_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_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_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:loc xlink:type="locator" xlink:href="optt-20220731.xsd#OPTT_BorrDrillingMember" xlink:label="OPTT_BorrDrillingMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_BorrDrillingMember" xlink:to="OPTT_BorrDrillingMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_BorrDrillingMember_doc" xml:lang="en-US">Borr Drilling [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220731.xsd#OPTT_BlueZoneGroupMember" xlink:label="OPTT_BlueZoneGroupMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_BlueZoneGroupMember" xlink:to="OPTT_BlueZoneGroupMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_BlueZoneGroupMember_doc" xml:lang="en-US">Blue Zone Group [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220731.xsd#OPTT_STHudsonEngineersIncMember" xlink:label="OPTT_STHudsonEngineersIncMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_STHudsonEngineersIncMember" xlink:to="OPTT_STHudsonEngineersIncMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_STHudsonEngineersIncMember_doc" xml:lang="en-US">ST Hudson Engineers Inc [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220731.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_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:loc xlink:type="locator" xlink:href="optt-20220731.xsd#OPTT_ValarisMember" xlink:label="OPTT_ValarisMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_ValarisMember" xlink:to="OPTT_ValarisMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_ValarisMember_doc" xml:lang="en-US">Valaris [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20220731.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_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_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsUnvestedOutstandingIntrinsicValue" xlink:to="OPTT_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsUnvestedOutstandingIntrinsicValue_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsUnvestedOutstandingIntrinsicValue_doc" xml:lang="en-US">Unvested intrinsic value.</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_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_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_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_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_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_SaleOfStockConsiderationReceivedPerTransactionRemaining" xlink:to="OPTT_SaleOfStockConsiderationReceivedPerTransactionRemaining_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_SaleOfStockConsiderationReceivedPerTransactionRemaining_doc" xml:lang="en-US">Sale Of Stock Consideration Received Per Transaction Remaining.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_RevenueRecognizedAndNotBilledAsOfEndOfPeriod" xlink:to="OPTT_RevenueRecognizedAndNotBilledAsOfEndOfPeriod_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_RevenueRecognizedAndNotBilledAsOfEndOfPeriod_doc" 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="OPTT_IncreaseDecreaseInContractWithCustomerAssets" xlink:to="OPTT_IncreaseDecreaseInContractWithCustomerAssets_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_IncreaseDecreaseInContractWithCustomerAssets_doc" xml:lang="en-US">Increase decrease in contract with customer assets.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_PaymentsCollectedForWhichRevenueHasNotBeenRecognized" xlink:to="OPTT_PaymentsCollectedForWhichRevenueHasNotBeenRecognized_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_PaymentsCollectedForWhichRevenueHasNotBeenRecognized_doc" 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="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: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_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: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_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_ChangeInContingentLiabilityConsideration" xlink:to="OPTT_ChangeInContingentLiabilityConsideration_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_ChangeInContingentLiabilityConsideration_doc" xml:lang="en-US">Change in contingent liability consideration.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_AmortizationOfPremiumOnMarketableSecurities" xlink:to="OPTT_AmortizationOfPremiumOnMarketableSecurities_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_AmortizationOfPremiumOnMarketableSecurities_doc" xml:lang="en-US">Amortization of premium on marketable securities.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_ThreeAndTwoCustomersMember" xlink:to="OPTT_ThreeAndTwoCustomersMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_ThreeAndTwoCustomersMember_doc" xml:lang="en-US">Three and Two Customers [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_IncreaseDecreaseInContingentLiability" xlink:to="OPTT_IncreaseDecreaseInContingentLiability_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_IncreaseDecreaseInContingentLiability_doc" xml:lang="en-US">The increase (decrease) in contingent liability.</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_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: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>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SharesOutstanding" xlink:to="us-gaap_SharesOutstanding_3_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SharesOutstanding_3_lbl" xml:lang="en-US">Shares, Outstanding</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_ChangeInContingentLiabilityConsideration" xlink:to="OPTT_ChangeInContingentLiabilityConsideration_3_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_ChangeInContingentLiabilityConsideration_3_lbl" xml:lang="en-US">ChangeInContingentLiabilityConsideration</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInAccountsReceivable" xlink:to="us-gaap_IncreaseDecreaseInAccountsReceivable_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IncreaseDecreaseInAccountsReceivable_2_lbl" xml:lang="en-US">Increase (Decrease) in Accounts Receivable</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" />
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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" />
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      <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_IncreaseDecreaseInAccruedExpenses" xlink:to="OPTT_IncreaseDecreaseInAccruedExpenses_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_NetCashProvidedByUsedInOperatingActivities" xlink:to="us-gaap_NetCashProvidedByUsedInOperatingActivities_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_PaymentsToAcquireMarketableSecurities" xlink:to="us-gaap_PaymentsToAcquireMarketableSecurities_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_PaymentsToAcquirePropertyPlantAndEquipment" xlink:to="us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_2_lbl" xml:lang="en-US">Payments to Acquire Property, Plant, and Equipment</link:label>
      <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_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_InventoryDisclosureTextBlock" xlink:to="us-gaap_InventoryDisclosureTextBlock_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InventoryDisclosureTextBlock_2_lbl" xml:lang="en-US">Inventory Disclosure [Text Block]</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" />
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      <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="OPTT_SaleOfStockConsiderationReceivedPerTransactionRemaining" xlink:to="OPTT_SaleOfStockConsiderationReceivedPerTransactionRemaining_3_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_SaleOfStockConsiderationReceivedPerTransactionRemaining_3_lbl" xml:lang="en-US">SaleOfStockConsiderationReceivedPerTransactionRemaining</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/label" xlink:label="us-gaap_ContractWithCustomerAssetNet_2_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="OPTT_IncreaseDecreaseInContractWithCustomerAssets" xlink:to="OPTT_IncreaseDecreaseInContractWithCustomerAssets_3_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_IncreaseDecreaseInContractWithCustomerAssets_3_lbl" xml:lang="en-US">IncreaseDecreaseInContractWithCustomerAssets</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ContractWithCustomerLiability" xlink:to="us-gaap_ContractWithCustomerLiability_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ContractWithCustomerLiability_2_lbl" xml:lang="en-US">Contract with Customer, Liability</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" />
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      <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" />
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      <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:linkbase>
</XBRL>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-101.PRE
<SEQUENCE>10
<FILENAME>optt-20220731_pre.xml
<DESCRIPTION>XBRL PRESENTATION FILE
<TEXT>
<XBRL>
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<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_EntityAddressStateOrProvince', window );">Entity Address, State or Province</a></td>
<td class="text">NJ<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="Show.showAR( this, 'defref_dei_EntityAddressPostalZipCode', window );">Entity Address, Postal Zip Code</a></td>
<td class="text">08831<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="Show.showAR( this, 'defref_dei_CityAreaCode', window );">City Area Code</a></td>
<td class="text">(609)<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="Show.showAR( this, 'defref_dei_LocalPhoneNumber', window );">Local Phone Number</a></td>
<td class="text">730-0400<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="Show.showAR( this, 'defref_dei_Security12bTitle', window );">Title of 12(b) Security</a></td>
<td class="text">Common
    Stock $0.001 par value<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="Show.showAR( this, 'defref_dei_TradingSymbol', window );">Trading Symbol</a></td>
<td class="text">OPTT<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="Show.showAR( this, 'defref_dei_SecurityExchangeName', window );">Security Exchange Name</a></td>
<td class="text">NYSE<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="Show.showAR( this, 'defref_dei_EntityCurrentReportingStatus', window );">Entity Current Reporting Status</a></td>
<td class="text">Yes<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="Show.showAR( this, 'defref_dei_EntityInteractiveDataCurrent', window );">Entity Interactive Data Current</a></td>
<td class="text">Yes<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="Show.showAR( this, 'defref_dei_EntityFilerCategory', window );">Entity Filer Category</a></td>
<td class="text">Non-accelerated Filer<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="Show.showAR( this, 'defref_dei_EntitySmallBusiness', window );">Entity Small Business</a></td>
<td class="text">true<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="Show.showAR( this, 'defref_dei_EntityEmergingGrowthCompany', window );">Entity Emerging Growth Company</a></td>
<td class="text">false<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="Show.showAR( this, 'defref_dei_EntityShellCompany', window );">Entity Shell Company</a></td>
<td class="text">false<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="Show.showAR( this, 'defref_dei_EntityCommonStockSharesOutstanding', window );">Entity Common Stock, Shares Outstanding</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">55,922,880<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_AmendmentFlag">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_AmendmentFlag</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_CityAreaCode">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Area code of city</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_CityAreaCode</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_CoverAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Cover page.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_CoverAbstract</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: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_dei_CurrentFiscalYearEndDate">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>End date of current fiscal year in the format --MM-DD.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_CurrentFiscalYearEndDate</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:gMonthDayItemType</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_DocumentFiscalPeriodFocus">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_DocumentFiscalPeriodFocus</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:fiscalPeriodItemType</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_DocumentFiscalYearFocus">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_DocumentFiscalYearFocus</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:gYearItemType</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_DocumentPeriodEndDate">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_DocumentPeriodEndDate</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: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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Address Line 2 such as Street or Suite number</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Name of the City or Town</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Code for the postal or zip code</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Name of the state or province.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Indicate if registrant meets the emerging growth company criteria.</p></div>
<a href="javascript:void(0);" onclick="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="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Local phone number for entity.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Title of a 12(b) registered security.</p></div>
<a href="javascript:void(0);" onclick="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="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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>
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<SEQUENCE>12
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<DESCRIPTION>IDEA: XBRL DOCUMENT
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<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;">v3.22.2.2</span><table class="report" border="0" cellspacing="2" id="idm140132826478688">
<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>Jul. 31, 2022</div></th>
<th class="th"><div>Apr. 30, 2022</div></th>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="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="Show.showAR( this, 'defref_us-gaap_CashAndCashEquivalentsAtCarryingValue', window );">Cash and cash equivalents</a></td>
<td class="nump">$ 9,176<span></span>
</td>
<td class="nump">$ 7,885<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_MarketableSecuritiesCurrent', window );">Marketable securities</a></td>
<td class="nump">42,724<span></span>
</td>
<td class="nump">49,384<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_RestrictedCashCurrent', window );">Restricted cash, short-term</a></td>
<td class="nump">258<span></span>
</td>
<td class="nump">258<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_AccountsReceivableNetCurrent', window );">Accounts receivable</a></td>
<td class="nump">119<span></span>
</td>
<td class="nump">482<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_ContractWithCustomerAssetNetCurrent', window );">Contract assets</a></td>
<td class="nump">666<span></span>
</td>
<td class="nump">386<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_InventoryNet', window );">Inventory</a></td>
<td class="nump">588<span></span>
</td>
<td class="nump">442<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_OtherAssetsCurrent', window );">Other current assets</a></td>
<td class="nump">480<span></span>
</td>
<td class="nump">467<span></span>
</td>
</tr>
<tr class="reu">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_AssetsCurrent', window );">Total current assets</a></td>
<td class="nump">54,011<span></span>
</td>
<td class="nump">59,304<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_PropertyPlantAndEquipmentNet', window );">Property and equipment, net</a></td>
<td class="nump">458<span></span>
</td>
<td class="nump">445<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_IntangibleAssetsNetExcludingGoodwill', window );">Intangibles, net</a></td>
<td class="nump">4,096<span></span>
</td>
<td class="nump">4,136<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_OperatingLeaseRightOfUseAsset', window );">Right-of-use asset, net</a></td>
<td class="nump">677<span></span>
</td>
<td class="nump">752<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_RestrictedCashNoncurrent', window );">Restricted cash, long-term</a></td>
<td class="nump">219<span></span>
</td>
<td class="nump">219<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_Goodwill', window );">Goodwill</a></td>
<td class="nump">8,537<span></span>
</td>
<td class="nump">8,537<span></span>
</td>
</tr>
<tr class="reu">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_Assets', window );">Total assets</a></td>
<td class="nump">67,998<span></span>
</td>
<td class="nump">73,393<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="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="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_AccountsPayableCurrent', window );">Accounts payable</a></td>
<td class="nump">1,058<span></span>
</td>
<td class="nump">905<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_AccruedLiabilitiesCurrent', window );">Accrued expenses</a></td>
<td class="nump">1,090<span></span>
</td>
<td class="nump">877<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_ContractWithCustomerLiabilityCurrent', window );">Contract liabilities</a></td>
<td class="nump">101<span></span>
</td>
<td class="nump">129<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_OperatingLeaseLiabilityCurrent', window );">Right-of-use liability, current portion</a></td>
<td class="nump">328<span></span>
</td>
<td class="nump">319<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_BusinessCombinationContingentConsiderationLiabilityCurrent', window );">Contingent liabilities, current portion</a></td>
<td class="nump">640<span></span>
</td>
<td class="nump">748<span></span>
</td>
</tr>
<tr class="rou">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_LiabilitiesCurrent', window );">Total current liabilities</a></td>
<td class="nump">3,217<span></span>
</td>
<td class="nump">2,978<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_DeferredIncomeTaxLiabilitiesNet', window );">Deferred tax liability</a></td>
<td class="nump">203<span></span>
</td>
<td class="nump">203<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent', window );">Contingent liabilities, less current portion</a></td>
<td class="nump">820<span></span>
</td>
<td class="nump">843<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_OperatingLeaseLiabilityNoncurrent', window );">Right-of-use liability, less current portion</a></td>
<td class="nump">446<span></span>
</td>
<td class="nump">538<span></span>
</td>
</tr>
<tr class="rou">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_Liabilities', window );">Total liabilities</a></td>
<td class="nump">4,686<span></span>
</td>
<td class="nump">4,562<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_CommitmentsAndContingencies', window );">Commitments and contingencies (Note 13)</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="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="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="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="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_CommonStockValue', window );">Common stock, $0.001 par value; authorized 100,000,000 shares, issued 55,921,880 shares and 55,905,213 shares, respectively; outstanding 55,898,528 shares and 55,881,861 shares, respectively</a></td>
<td class="nump">56<span></span>
</td>
<td class="nump">56<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_TreasuryStockValue', window );">Treasury stock, at cost; 23,352 shares</a></td>
<td class="num">(341)<span></span>
</td>
<td class="num">(341)<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_AdditionalPaidInCapital', window );">Additional paid-in capital</a></td>
<td class="nump">323,265<span></span>
</td>
<td class="nump">322,932<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_RetainedEarningsAccumulatedDeficit', window );">Accumulated deficit</a></td>
<td class="num">(259,622)<span></span>
</td>
<td class="num">(253,770)<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax', window );">Accumulated other comprehensive loss</a></td>
<td class="num">(46)<span></span>
</td>
<td class="num">(46)<span></span>
</td>
</tr>
<tr class="reu">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_StockholdersEquity', window );">Total shareholders&#8217; equity</a></td>
<td class="nump">63,312<span></span>
</td>
<td class="nump">68,831<span></span>
</td>
</tr>
<tr class="rou">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_LiabilitiesAndStockholdersEquity', window );">Total liabilities and shareholders&#8217; equity</a></td>
<td class="nump">$ 67,998<span></span>
</td>
<td class="nump">$ 73,393<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_AccountsPayableCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://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 https://asc.fasb.org/extlink&amp;oid=84165509&amp;loc=d3e56426-112766<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://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 310<br> -SubTopic 10<br> -Section 45<br> -Paragraph 9<br> -URI https://asc.fasb.org/extlink&amp;oid=124259787&amp;loc=d3e4531-111522<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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>
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</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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://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 https://asc.fasb.org/extlink&amp;oid=126968391&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 https://asc.fasb.org/extlink&amp;oid=126734703&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 https://asc.fasb.org/extlink&amp;oid=126968391&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 https://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 https://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 https://asc.fasb.org/extlink&amp;oid=126968391&amp;loc=d3e681-108580<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://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(30)(a)(1))<br> -URI https://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="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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<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>
</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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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>
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<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 45<br> -Paragraph 1<br> -URI https://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 https://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 https://asc.fasb.org/extlink&amp;oid=124433192&amp;loc=SL2890621-112765<br><br>Reference 4: 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3<br> -Subparagraph (bb)<br> -URI https://asc.fasb.org/extlink&amp;oid=123419778&amp;loc=d3e5710-111685<br><br>Reference 17: 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 https://asc.fasb.org/extlink&amp;oid=126975872&amp;loc=SL124442526-122756<br><br>Reference 18: 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(9))<br> -URI https://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<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 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<a href="javascript:void(0);" onclick="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="Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
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<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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://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 https://asc.fasb.org/extlink&amp;oid=126966325&amp;loc=d3e6819-128478<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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>
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<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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Amount of liability recognized arising from contingent consideration in a business combination, expected to be settled beyond one year or the normal operating cycle, if longer.</p></div>
<a href="javascript:void(0);" onclick="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 https://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 https://asc.fasb.org/extlink&amp;oid=126966325&amp;loc=d3e6819-128478<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_BusinessCombinationContingentConsiderationLiabilityNoncurrent</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> 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_CashAndCashEquivalentsAtCarryingValue">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
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<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=126954810&amp;loc=d3e3044-108585<br><br>Reference 2: 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 (a)<br> -URI https://asc.fasb.org/extlink&amp;oid=124098289&amp;loc=d3e6676-107765<br><br>Reference 3: 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(1))<br> -URI https://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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>
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<tr>
<td><strong> Data Type:</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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://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 https://asc.fasb.org/extlink&amp;oid=126734703&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 https://asc.fasb.org/extlink&amp;oid=126897435&amp;loc=d3e534808-122878<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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>
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<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
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<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_CommonStockValue">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://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 https://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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>
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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>
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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></div>
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</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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=126919976&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 https://asc.fasb.org/extlink&amp;oid=126919976&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 https://asc.fasb.org/extlink&amp;oid=126920106&amp;loc=SL49130549-203045<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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>
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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>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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=126919976&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 https://asc.fasb.org/extlink&amp;oid=126919976&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 https://asc.fasb.org/extlink&amp;oid=126920106&amp;loc=SL49130549-203045<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_DeferredIncomeTaxLiabilitiesNet">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences with jurisdictional netting.</p></div>
<a href="javascript:void(0);" onclick="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 45<br> -Paragraph 6<br> -URI https://asc.fasb.org/extlink&amp;oid=123427490&amp;loc=d3e31931-109318<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 45<br> -Paragraph 4<br> -URI https://asc.fasb.org/extlink&amp;oid=123427490&amp;loc=d3e31917-109318<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_DeferredIncomeTaxLiabilitiesNet</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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 350<br> -SubTopic 20<br> -Section 50<br> -Paragraph 1<br> -Subparagraph (a)<br> -URI https://asc.fasb.org/extlink&amp;oid=121556970&amp;loc=d3e13816-109267<br><br>Reference 2: 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 https://asc.fasb.org/extlink&amp;oid=126897435&amp;loc=d3e534808-122878<br><br>Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 350<br> -SubTopic 20<br> -Section 50<br> -Paragraph 1<br> -Subparagraph (h)<br> -URI https://asc.fasb.org/extlink&amp;oid=121556970&amp;loc=d3e13816-109267<br><br>Reference 4: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 350<br> -SubTopic 20<br> -Section 55<br> -Paragraph 24<br> -URI https://asc.fasb.org/extlink&amp;oid=122137925&amp;loc=d3e14258-109268<br><br>Reference 5: 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 https://asc.fasb.org/extlink&amp;oid=84165509&amp;loc=d3e56426-112766<br><br>Reference 6: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 350<br> -SubTopic 20<br> -Section 45<br> -Paragraph 1<br> -URI https://asc.fasb.org/extlink&amp;oid=99380562&amp;loc=d3e13770-109266<br><br>Reference 7: 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(15))<br> -URI https://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://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 https://asc.fasb.org/extlink&amp;oid=6388964&amp;loc=d3e16212-109274<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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(6))<br> -URI https://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 210<br> -SubTopic 10<br> -Section 45<br> -Paragraph 1<br> -Subparagraph (b)<br> -URI https://asc.fasb.org/extlink&amp;oid=124098289&amp;loc=d3e6676-107765<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 https://asc.fasb.org/extlink&amp;oid=84165509&amp;loc=d3e56426-112766<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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>
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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>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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://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 https://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="Show.toggleNext( this );">+ 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>
</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_LiabilitiesAndStockholdersEquity">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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>
<a href="javascript:void(0);" onclick="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 323<br> -SubTopic 10<br> -Section 50<br> -Paragraph 3<br> -Subparagraph (c)<br> -URI https://asc.fasb.org/extlink&amp;oid=114001798&amp;loc=d3e33918-111571<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 https://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 942<br> -SubTopic 210<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.9-03(23))<br> -URI https://asc.fasb.org/extlink&amp;oid=126897435&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 944<br> -SubTopic 210<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.7-03(a)(25))<br> -URI https://asc.fasb.org/extlink&amp;oid=126734703&amp;loc=d3e572229-122910<br><br>Reference 5: 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 https://asc.fasb.org/extlink&amp;oid=120395691&amp;loc=d3e23780-122690<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(32))<br> -URI https://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 https://asc.fasb.org/extlink&amp;oid=123596393&amp;loc=d3e14064-108612<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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>
</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_LiabilitiesCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://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 https://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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https://asc.fasb.org/extlink&amp;oid=126975872&amp;loc=SL124442552-122756<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 1A<br> -Subparagraph (SX 210.13-01(a)(4)(iii)(A))<br> -URI https://asc.fasb.org/extlink&amp;oid=126975872&amp;loc=SL124442526-122756<br><br>Reference 17: 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 https://asc.fasb.org/extlink&amp;oid=126975872&amp;loc=SL124442526-122756<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 https://asc.fasb.org/extlink&amp;oid=126975872&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 825<br> -SubTopic 10<br> -Section 50<br> -Paragraph 28<br> -Subparagraph (f)<br> -URI https://asc.fasb.org/extlink&amp;oid=123596393&amp;loc=d3e14064-108612<br><br>Reference 20: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section 45<br> -Paragraph 5<br> -URI https://asc.fasb.org/extlink&amp;oid=124098289&amp;loc=d3e6904-107765<br><br>Reference 21: 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 https://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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>
<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_LiabilitiesCurrentAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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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<td><strong> Period Type:</strong></td>
<td>duration</td>
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</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_MarketableSecuritiesCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Amount of investment in marketable security, classified as current.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_MarketableSecuritiesCurrent</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>xbrli:monetaryItemType</td>
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<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_OperatingLeaseLiabilityCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=123391704&amp;loc=SL77918627-209977<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=123391704&amp;loc=SL77918627-209977<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=123391704&amp;loc=SL77918627-209977<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Amount of current assets classified as other.</p></div>
<a href="javascript:void(0);" onclick="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(8))<br> -URI https://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 https://asc.fasb.org/extlink&amp;oid=84165509&amp;loc=d3e56426-112766<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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>
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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>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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://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 https://asc.fasb.org/extlink&amp;oid=84165509&amp;loc=d3e56426-112766<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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> -URI https://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 944<br> -SubTopic 210<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.7-03(a)(8))<br> -URI https://asc.fasb.org/extlink&amp;oid=126734703&amp;loc=d3e572229-122910<br><br>Reference 3: 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 https://asc.fasb.org/extlink&amp;oid=124429447&amp;loc=SL124453093-239630<br><br>Reference 4: 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 https://asc.fasb.org/extlink&amp;oid=84165509&amp;loc=d3e56426-112766<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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>
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<tr>
<td><strong> Balance Type:</strong></td>
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<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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=126999549&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 https://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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>
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<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
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<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_RestrictedCashNoncurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(17))<br> -URI https://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 230<br> -SubTopic 10<br> -Section 50<br> -Paragraph 8<br> -URI https://asc.fasb.org/extlink&amp;oid=126999549&amp;loc=SL98516268-108586<br><br>Reference 3: 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 https://asc.fasb.org/extlink&amp;oid=120413173&amp;loc=SL116631458-115580<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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>
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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>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>
</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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://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 https://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 944<br> -SubTopic 210<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.7-03(a)(23)(a)(4))<br> -URI https://asc.fasb.org/extlink&amp;oid=126734703&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 944<br> -SubTopic 40<br> -Section 65<br> -Paragraph 2<br> -Subparagraph (h)(2)<br> -URI https://asc.fasb.org/extlink&amp;oid=124501264&amp;loc=SL117420844-207641<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 S99<br> -Paragraph 1<br> -Subparagraph (SX 210.3-04)<br> -URI https://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 944<br> -SubTopic 40<br> -Section 65<br> -Paragraph 2<br> -Subparagraph (g)(2)(i)<br> -URI https://asc.fasb.org/extlink&amp;oid=124501264&amp;loc=SL117420844-207641<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://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 https://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 https://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 https://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 https://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 https://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 https://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 https://asc.fasb.org/extlink&amp;oid=114001798&amp;loc=d3e33918-111571<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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>
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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>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>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_StockholdersEquityAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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>
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<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<td>duration</td>
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<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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://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 https://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 https://asc.fasb.org/extlink&amp;oid=6405813&amp;loc=d3e23239-112655<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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>
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<tr>
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<td>us-gaap_</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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<td>instant</td>
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<span style="display: none;">v3.22.2.2</span><table class="report" border="0" cellspacing="2" id="idm140132824490784">
<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>Jul. 31, 2022</div></th>
<th class="th"><div>Apr. 30, 2022</div></th>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="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="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>
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<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="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="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="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="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="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="Show.showAR( this, 'defref_us-gaap_CommonStockSharesIssued', window );">Common stock, shares issued</a></td>
<td class="nump">55,921,880<span></span>
</td>
<td class="nump">55,905,213<span></span>
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</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_CommonStockSharesOutstanding', window );">Common stock, shares outstanding</a></td>
<td class="nump">55,898,528<span></span>
</td>
<td class="nump">55,881,861<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_TreasuryStockShares', window );">Treasury stock, shares</a></td>
<td class="nump">23,352<span></span>
</td>
<td class="nump">23,352<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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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>
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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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<tr>
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</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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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>
</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_CommonStockSharesIssued">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_CommonStockSharesOutstanding">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=126973232&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 https://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_CommonStockSharesOutstanding</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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://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 https://asc.fasb.org/extlink&amp;oid=126973232&amp;loc=SL123496158-112644<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://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 https://asc.fasb.org/extlink&amp;oid=126973232&amp;loc=SL123496158-112644<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://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 https://asc.fasb.org/extlink&amp;oid=6405813&amp;loc=d3e23239-112655<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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>
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<span style="display: none;">v3.22.2.2</span><table class="report" border="0" cellspacing="2" id="idm140132821873456">
<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>
</tr>
<tr>
<th class="th"><div>Jul. 31, 2022</div></th>
<th class="th"><div>Jul. 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="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>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax', window );">Revenues</a></td>
<td class="nump">$ 714<span></span>
</td>
<td class="nump">$ 272<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_CostOfRevenue', window );">Cost of revenues</a></td>
<td class="nump">520<span></span>
</td>
<td class="nump">423<span></span>
</td>
</tr>
<tr class="rou">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_GrossProfit', window );">Gross margin (loss)</a></td>
<td class="nump">194<span></span>
</td>
<td class="num">(151)<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1', window );">Change in fair value of contingent consideration</a></td>
<td class="num">(131)<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="Show.showAR( this, 'defref_us-gaap_OperatingExpenses', window );">Operating expenses</a></td>
<td class="nump">6,318<span></span>
</td>
<td class="nump">4,880<span></span>
</td>
</tr>
<tr class="reu">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_OperatingIncomeLoss', window );">Operating loss</a></td>
<td class="num">(5,993)<span></span>
</td>
<td class="num">(5,031)<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_InterestIncomeExpenseNet', window );">Interest income, net</a></td>
<td class="nump">141<span></span>
</td>
<td class="nump">20<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_GainsLossesOnExtinguishmentOfDebt', window );">Gain on extinguishment of PPP loan</a></td>
<td class="text"> <span></span>
</td>
<td class="nump">891<span></span>
</td>
</tr>
<tr class="rou">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest', window );">Loss before income taxes</a></td>
<td class="num">(5,852)<span></span>
</td>
<td class="num">(4,120)<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_IncomeTaxExpenseBenefit', window );">Income tax benefit</a></td>
<td class="text"> <span></span>
</td>
<td class="nump">1,041<span></span>
</td>
</tr>
<tr class="rou">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_NetIncomeLoss', window );">Net loss</a></td>
<td class="num">$ (5,852)<span></span>
</td>
<td class="num">$ (3,079)<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_EarningsPerShareBasic', window );">Basic and diluted net loss per share</a></td>
<td class="num">$ (0.10)<span></span>
</td>
<td class="num">$ (0.06)<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic', window );">Weighted average shares used to compute basic and diluted net loss per share</a></td>
<td class="nump">55,889,651<span></span>
</td>
<td class="nump">52,458,011<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_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement.</p></div>
<a href="javascript:void(0);" onclick="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 https://asc.fasb.org/extlink&amp;oid=126954810&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 805<br> -SubTopic 30<br> -Section 50<br> -Paragraph 4<br> -Subparagraph (a)(1)<br> -URI https://asc.fasb.org/extlink&amp;oid=126975305&amp;loc=d3e7008-128479<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1</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_CostOfRevenue">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=126975872&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 https://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 https://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 https://asc.fasb.org/extlink&amp;oid=126975872&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 https://asc.fasb.org/extlink&amp;oid=126953954&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 https://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 https://asc.fasb.org/extlink&amp;oid=126975872&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 https://asc.fasb.org/extlink&amp;oid=126975872&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 https://asc.fasb.org/extlink&amp;oid=126975872&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 https://asc.fasb.org/extlink&amp;oid=126975872&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 https://asc.fasb.org/extlink&amp;oid=126975872&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 https://asc.fasb.org/extlink&amp;oid=126975872&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 https://asc.fasb.org/extlink&amp;oid=126975872&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 https://asc.fasb.org/extlink&amp;oid=126975872&amp;loc=SL124442552-122756<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_EarningsPerShareBasic">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.</p></div>
<a href="javascript:void(0);" onclick="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 815<br> -SubTopic 40<br> -Section 65<br> -Paragraph 1<br> -Subparagraph (e)(4)<br> -URI https://asc.fasb.org/extlink&amp;oid=126732423&amp;loc=SL123482106-238011<br><br>Reference 2: 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 3<br> -URI https://asc.fasb.org/extlink&amp;oid=124431687&amp;loc=d3e22583-107794<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 11<br> -Subparagraph (b)<br> -URI https://asc.fasb.org/extlink&amp;oid=124431687&amp;loc=d3e22694-107794<br><br>Reference 4: 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-SubTopic 10<br> -Section S99<br> -Paragraph 2<br> -Subparagraph (SX 210.5-03(25))<br> -URI https://asc.fasb.org/extlink&amp;oid=126953954&amp;loc=SL114868664-224227<br><br>Reference 15: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 260<br> -SubTopic 10<br> -Section 45<br> -Paragraph 2<br> -URI https://asc.fasb.org/extlink&amp;oid=126958026&amp;loc=d3e1252-109256<br><br>Reference 16: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 260<br> -SubTopic 10<br> -Section 45<br> -Paragraph 60B<br> -Subparagraph (d)<br> -URI https://asc.fasb.org/extlink&amp;oid=126958026&amp;loc=SL5780133-109256<br><br>Reference 17: 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(27))<br> -URI https://asc.fasb.org/extlink&amp;oid=120399700&amp;loc=SL114874048-224260<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_EarningsPerShareBasic</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_GainsLossesOnExtinguishmentOfDebt">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=126972273&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 https://asc.fasb.org/extlink&amp;oid=126972273&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 https://asc.fasb.org/extlink&amp;oid=126954810&amp;loc=d3e3602-108585<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=126901519&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 https://asc.fasb.org/extlink&amp;oid=126901519&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 https://asc.fasb.org/extlink&amp;oid=126901519&amp;loc=d3e8736-108599<br><br>Reference 4: 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<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=126901519&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 https://asc.fasb.org/extlink&amp;oid=126901519&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 https://asc.fasb.org/extlink&amp;oid=126901519&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 https://asc.fasb.org/extlink&amp;oid=126941158&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 https://asc.fasb.org/extlink&amp;oid=126901519&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 https://asc.fasb.org/extlink&amp;oid=126953954&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 https://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 https://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 https://asc.fasb.org/extlink&amp;oid=126901519&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 https://asc.fasb.org/extlink&amp;oid=120399700&amp;loc=SL114874048-224260<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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>
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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>
</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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://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 https://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 https://asc.fasb.org/extlink&amp;oid=126901519&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 https://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 https://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 https://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 https://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 https://asc.fasb.org/extlink&amp;oid=124431687&amp;loc=d3e22658-107794<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>The net amount of operating interest income (expense).</p></div>
<a href="javascript:void(0);" onclick="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 https://asc.fasb.org/extlink&amp;oid=120399700&amp;loc=SL114874048-224260<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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>
<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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="Show.toggleNext( this );">+ 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_OperatingExpenses">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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>
</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_OperatingIncomeLoss">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="Show.toggleNext( this );">+ 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_RevenueFromContractWithCustomerExcludingAssessedTax">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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>
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<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_WeightedAverageNumberOfSharesOutstandingBasic">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.</p></div>
<a href="javascript:void(0);" onclick="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 (a)<br> -URI https://asc.fasb.org/extlink&amp;oid=124432515&amp;loc=d3e3550-109257<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 260<br> -SubTopic 10<br> -Section 45<br> -Paragraph 10<br> -URI https://asc.fasb.org/extlink&amp;oid=126958026&amp;loc=d3e1448-109256<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_WeightedAverageNumberOfSharesOutstandingBasic</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<span style="display: none;">v3.22.2.2</span><table class="report" border="0" cellspacing="2" id="idm140132824758560">
<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>
</tr>
<tr>
<th class="th"><div>Jul. 31, 2022</div></th>
<th class="th"><div>Jul. 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="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>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_NetIncomeLoss', window );">Net loss</a></td>
<td class="num">$ (5,852)<span></span>
</td>
<td class="num">$ (3,079)<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax', window );">Foreign currency translation adjustment</a></td>
<td class="text"> <span></span>
</td>
<td class="num">(14)<span></span>
</td>
</tr>
<tr class="rou">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest', window );">Total comprehensive loss</a></td>
<td class="num">$ (5,852)<span></span>
</td>
<td class="num">$ (3,093)<span></span>
</td>
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<div style="display: none;">
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<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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>
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<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest</td>
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<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="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="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="Show.toggleNext( this );">+ 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>
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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="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="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 https://asc.fasb.org/extlink&amp;oid=126968391&amp;loc=SL7669646-108580<br></p></div>
<a href="javascript:void(0);" onclick="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>
<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>
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</div></td></tr>
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<span style="display: none;">v3.22.2.2</span><table class="report" border="0" cellspacing="2" id="idm140132821793600">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Consolidated Statement of Shareholders' 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>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="Show.showAR( this, 'defref_us-gaap_StockholdersEquity', window );">Beginning balance, value 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="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="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>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="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="num">(3,079)<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="num">(3,079)<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="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">390<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">390<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_OtherComprehensiveIncomeLossNetOfTax', window );">Other comprehensive 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">(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="Show.showAR( this, 'defref_us-gaap_StockholdersEquity', window );">Ending balance, value at Jul. 31, 2021</a></td>
<td class="nump">$ 52<span></span>
</td>
<td class="num">$ (338)<span></span>
</td>
<td class="nump">316,211<span></span>
</td>
<td class="num">(237,975)<span></span>
</td>
<td class="num">(185)<span></span>
</td>
<td class="nump">77,765<span></span>
</td>
</tr>
<tr class="rc">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_SharesOutstanding', window );">Ending balance, shares at Jul. 31, 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>
</tr>
<tr class="rc">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_StockholdersEquity', window );">Beginning balance, value at Apr. 30, 2022</a></td>
<td class="nump">$ 56<span></span>
</td>
<td class="num">$ (341)<span></span>
</td>
<td class="nump">322,932<span></span>
</td>
<td class="num">(253,770)<span></span>
</td>
<td class="num">(46)<span></span>
</td>
<td class="nump">68,831<span></span>
</td>
</tr>
<tr class="rc">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_SharesOutstanding', window );">Beginning balance, shares at Apr. 30, 2022</a></td>
<td class="nump">55,905,213<span></span>
</td>
<td class="num">(23,352)<span></span>
</td>
<td class="text">&#160;<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="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="num">(5,852)<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="num">(5,852)<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="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">333<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">333<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross', window );">Common stock issued upon vesting of restricted stock</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="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="Show.showAR( this, 'defref_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross', window );">Common stock issued upon exercise of stock options, shares</a></td>
<td class="nump">16,667<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="rc">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_StockholdersEquity', window );">Ending balance, value at Jul. 31, 2022</a></td>
<td class="nump">$ 56<span></span>
</td>
<td class="num">$ (341)<span></span>
</td>
<td class="nump">$ 323,265<span></span>
</td>
<td class="num">$ (259,622)<span></span>
</td>
<td class="num">$ (46)<span></span>
</td>
<td class="nump">$ 63,312<span></span>
</td>
</tr>
<tr class="rc">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_SharesOutstanding', window );">Ending balance, shares at Jul. 31, 2022</a></td>
<td class="nump">55,921,880<span></span>
</td>
<td class="num">(23,352)<span></span>
</td>
<td class="text">&#160;<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_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=126964447&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 20<br> -Section 55<br> -Paragraph 13<br> -URI https://asc.fasb.org/extlink&amp;oid=126964447&amp;loc=d3e11178-113907<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 35<br> -Paragraph 2<br> -URI https://asc.fasb.org/extlink&amp;oid=126961718&amp;loc=d3e4534-113899<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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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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 https://asc.fasb.org/extlink&amp;oid=126975872&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 https://asc.fasb.org/extlink&amp;oid=126901519&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 https://asc.fasb.org/extlink&amp;oid=126901519&amp;loc=d3e8933-108599<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=126968391&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 https://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 https://asc.fasb.org/extlink&amp;oid=126973232&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 https://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 https://asc.fasb.org/extlink&amp;oid=126953954&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 https://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 https://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 https://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 https://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 https://asc.fasb.org/extlink&amp;oid=126968391&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 https://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 https://asc.fasb.org/extlink&amp;oid=120400993&amp;loc=SL114874131-224263<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_StockIssuedDuringPeriodSharesRestrictedStockAwardGross">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards.</p></div>
<a href="javascript:void(0);" onclick="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 https://asc.fasb.org/extlink&amp;oid=126973232&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 https://asc.fasb.org/extlink&amp;oid=120397183&amp;loc=d3e187085-122770<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_StockIssuedDuringPeriodSharesRestrictedStockAwardGross</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_StockIssuedDuringPeriodValueRestrictedStockAwardGross">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Aggregate value of stock related to Restricted Stock Awards issued during the period.</p></div>
<a href="javascript:void(0);" onclick="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 S99<br> -Paragraph 1<br> -Subparagraph (SX 210.3-04)<br> -URI https://asc.fasb.org/extlink&amp;oid=120397183&amp;loc=d3e187085-122770<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(28))<br> -URI https://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 S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(29))<br> -URI https://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 505<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -URI https://asc.fasb.org/extlink&amp;oid=126973232&amp;loc=d3e21463-112644<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_StockIssuedDuringPeriodValueRestrictedStockAwardGross</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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://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 https://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 https://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 https://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 https://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 https://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 https://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 https://asc.fasb.org/extlink&amp;oid=114001798&amp;loc=d3e33918-111571<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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>
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<span style="display: none;">v3.22.2.2</span><table class="report" border="0" cellspacing="2" id="idm140132826690320">
<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>
</tr>
<tr>
<th class="th"><div>Jul. 31, 2022</div></th>
<th class="th"><div>Jul. 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="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>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_NetIncomeLoss', window );">Net loss</a></td>
<td class="num">$ (5,852)<span></span>
</td>
<td class="num">$ (3,079)<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="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>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_DepreciationDepletionAndAmortization', window );">Depreciation of fixed assets</a></td>
<td class="nump">43<span></span>
</td>
<td class="nump">40<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_AmortizationOfIntangibleAssets', window );">Amortization of intangible assets</a></td>
<td class="nump">40<span></span>
</td>
<td class="nump">6<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_OperatingLeaseRightOfUseAssetAmortizationExpense', window );">Amortization of right of use asset</a></td>
<td class="nump">75<span></span>
</td>
<td class="nump">69<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="Show.showAR( this, 'defref_OPTT_AmortizationOfPremiumOnMarketableSecurities', window );">Amortization of premium on marketable securities</a></td>
<td class="nump">220<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="Show.showAR( this, 'defref_us-gaap_GainsLossesOnExtinguishmentOfDebt', window );">Gain on extinguishment of PPP Loan</a></td>
<td class="text"> <span></span>
</td>
<td class="num">(891)<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_ShareBasedCompensation', window );">Compensation expense related to equity compensation</a></td>
<td class="nump">333<span></span>
</td>
<td class="nump">390<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="Show.showAR( this, 'defref_OPTT_ChangeInContingentLiabilityConsideration', window );">Change in contingent liability consideration</a></td>
<td class="num">(131)<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="Show.showAR( this, 'defref_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract', window );"><strong>Changes in operating assets and 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="Show.showAR( this, 'defref_us-gaap_IncreaseDecreaseInAccountsReceivable', window );">Accounts receivable</a></td>
<td class="nump">363<span></span>
</td>
<td class="num">(96)<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_IncreaseDecreaseInContractWithCustomerAsset', window );">Contract assets</a></td>
<td class="num">(280)<span></span>
</td>
<td class="num">(114)<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_IncreaseDecreaseInInventories', window );">Inventory</a></td>
<td class="num">(146)<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="Show.showAR( this, 'defref_us-gaap_IncreaseDecreaseInOtherOperatingAssets', window );">Other assets</a></td>
<td class="num">(13)<span></span>
</td>
<td class="num">(20)<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_IncreaseDecreaseInAccountsPayable', window );">Accounts payable</a></td>
<td class="nump">154<span></span>
</td>
<td class="num">(233)<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="Show.showAR( this, 'defref_OPTT_IncreaseDecreaseInAccruedExpenses', window );">Accrued expenses</a></td>
<td class="nump">212<span></span>
</td>
<td class="num">(60)<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="Show.showAR( this, 'defref_OPTT_IncreaseDecreaseInLeaseLiability', window );">Change in right of use lease liability</a></td>
<td class="num">(82)<span></span>
</td>
<td class="num">(75)<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_IncreaseDecreaseInContractWithCustomerLiability', window );">Contract liabilities</a></td>
<td class="num">(28)<span></span>
</td>
<td class="text"> <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="Show.showAR( this, 'defref_OPTT_IncreaseDecreaseInLitigationPayable', window );">Litigation payable</a></td>
<td class="text"> <span></span>
</td>
<td class="num">(1,224)<span></span>
</td>
</tr>
<tr class="reu">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_NetCashProvidedByUsedInOperatingActivities', window );">Net cash used in operating activities</a></td>
<td class="num">(5,092)<span></span>
</td>
<td class="num">(5,287)<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="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>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities', window );">Redemptions of marketable securities</a></td>
<td class="nump">17,252<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="Show.showAR( this, 'defref_us-gaap_PaymentsToAcquireMarketableSecurities', window );">Purchase of marketable securities</a></td>
<td class="num">(10,813)<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="Show.showAR( this, 'defref_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment', window );">Purchase of property, plant and equipment</a></td>
<td class="num">(56)<span></span>
</td>
<td class="num">(7)<span></span>
</td>
</tr>
<tr class="rou">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_NetCashProvidedByUsedInInvestingActivities', window );">Net cash provided by (used in) investing activities</a></td>
<td class="nump">6,383<span></span>
</td>
<td class="num">(7)<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="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>
</tr>
<tr class="rou">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_NetCashProvidedByUsedInFinancingActivities', window );">Net cash provided by financing activities</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="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"> <span></span>
</td>
<td class="num">(14)<span></span>
</td>
</tr>
<tr class="rou">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect', window );">Net increase / (decrease) in cash, cash equivalents and restricted cash</a></td>
<td class="nump">1,291<span></span>
</td>
<td class="num">(5,308)<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations', window );">Cash, cash equivalents and restricted cash, beginning of period</a></td>
<td class="nump">8,362<span></span>
</td>
<td class="nump">83,634<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations', window );">Cash, cash equivalents and restricted cash, end of period</a></td>
<td class="nump">$ 9,653<span></span>
</td>
<td class="nump">$ 78,326<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_AmortizationOfPremiumOnMarketableSecurities">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Amortization of premium on marketable securities.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_AmortizationOfPremiumOnMarketableSecurities</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_ChangeInContingentLiabilityConsideration">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Change in contingent liability consideration.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_ChangeInContingentLiabilityConsideration</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_IncreaseDecreaseInAccruedExpenses">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Increase decrease in accrued expenses.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_IncreaseDecreaseInAccruedExpenses</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_IncreaseDecreaseInLeaseLiability">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Increase decrease in lease liability.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Increase decrease in litigation payable.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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>
<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_AmortizationOfIntangibleAssets">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=126954810&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 https://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 https://asc.fasb.org/extlink&amp;oid=6388964&amp;loc=d3e16225-109274<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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>
<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_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=126999549&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 https://asc.fasb.org/extlink&amp;oid=126954810&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 https://asc.fasb.org/extlink&amp;oid=126954810&amp;loc=d3e3044-108585<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://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 https://asc.fasb.org/extlink&amp;oid=126954810&amp;loc=d3e3521-108585<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=126901519&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 https://asc.fasb.org/extlink&amp;oid=126954810&amp;loc=d3e3602-108585<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=123444420&amp;loc=d3e33268-110906<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_GainsLossesOnExtinguishmentOfDebt">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=126972273&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 https://asc.fasb.org/extlink&amp;oid=126972273&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 https://asc.fasb.org/extlink&amp;oid=126954810&amp;loc=d3e3602-108585<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=126954810&amp;loc=d3e3602-108585<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=126954810&amp;loc=d3e3602-108585<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_IncreaseDecreaseInContractWithCustomerAsset">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=126954810&amp;loc=d3e3602-108585<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=126954810&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 https://asc.fasb.org/extlink&amp;oid=126938201&amp;loc=d3e55415-109406<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=126954810&amp;loc=d3e3602-108585<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=126954810&amp;loc=d3e3602-108585<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=126954810&amp;loc=d3e3521-108585<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=126954810&amp;loc=d3e3521-108585<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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>
<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_NetCashProvidedByUsedInOperatingActivities">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=126954810&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 https://asc.fasb.org/extlink&amp;oid=126954810&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 https://asc.fasb.org/extlink&amp;oid=126954810&amp;loc=d3e3602-108585<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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>
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<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_NetCashProvidedByUsedInOperatingActivitiesAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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>
</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_NetIncomeLoss">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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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<span style="display: none;">v3.22.2.2</span><table class="report" border="0" cellspacing="2" id="idm140132824580288">
<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">3 Months Ended</th>
</tr>
<tr><th class="th"><div>Jul. 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="Show.showAR( this, 'defref_us-gaap_AccountingPoliciesAbstract', window );"><strong>Accounting Policies [Abstract]</strong></a></td>
<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="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_zwjjcXi76R6g" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(1)
<span id="xdx_82B_zQLSahbtkDE7">Background, Basis of Presentation and Liquidity</span></b></span></p>

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



<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-indent: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Ocean Power Technologies, Inc. (&#8220;OPTI&#8221;) was founded in 1984
in New Jersey, commenced business operations in 1994 and re-incorporated in Delaware in 2007. Ocean Power Technologies, Inc. acquired
3dent Technology, LLC (&#8220;3Dent&#8221;), in February 2021 and Marine Advanced Robotics, Inc. (&#8220;MAR&#8221;) in November 2021
which are now included as part of the OPTI. OPTI, along with its subsidiaries, (the &#8220;Company&#8221;) is a complete solutions provider,
controlling the design, manufacturing, sales, installation, operations and maintenance of its products and services. The Company&#8217;s
solutions provide distributed offshore power and data 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 the Company&#8217;s goal is to generate the majority of its revenues
from the sale or lease of its products and solutions, and sales of services to support business operations.</span></p>

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



<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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 8 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, 2022,
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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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)</i></b></span> <span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>Liquidity</i></b></span></p>



<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">For
the three months ended July 31, 2022, the Company incurred net losses of approximately $<span id="xdx_90F_eus-gaap--NetIncomeLoss_iN_pn5n6_di_c20220501__20220731_zllaE0mWMFse" title="Net loss">5.9</span>
million, used cash in operations of approximately $<span id="xdx_90F_eus-gaap--NetCashProvidedByUsedInOperatingActivities_iN_pn5n6_di_c20220501__20220731_zWgehvsOgiYf" title="Cash in operations">5.1</span>
million and has an accumulated deficit of approximately $<span id="xdx_90D_eus-gaap--RetainedEarningsAccumulatedDeficit_iNI_pn5n6_di_c20220731_z1lZzigeENFe" title="Accumulated deficit">259.6</span>
million. The Company has continued to make investments in ongoing product development efforts in anticipation of future growth, as
evidenced by its acquisition of MAR 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, 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. Management believes the
Company&#8217;s current cash balance at July 31, 2022 of $<span id="xdx_909_eus-gaap--Cash_iI_pn5n6_c20220731_zgq1svZKLed7" title="Cash">9.4</span>
million and marketable securities balance of $<span id="xdx_901_eus-gaap--ShortTermInvestments_iI_pn5n6_c20220731_zYUpjcQON6Ik" title="Short-term investments">42.7</span>
million is sufficient to fund its planned expenditures through at least September 2023.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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;), having
capacity up to $<span id="xdx_907_eus-gaap--LineOfCreditFacilityMaximumBorrowingCapacity_iI_pn5n6_c20201120__us-gaap--TypeOfArrangementAxis__custom--TwoThousandTwentyATMFacilityMember__dei--LegalEntityAxis__custom--AGPAllianceGlobalPartnersMember_zlBwiVnAQbQi" title="Offering amount capacity">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_90A_eus-gaap--ProceedsFromIssuanceOfCommonStock_pn5n6_c20201203__20201204__us-gaap--TypeOfArrangementAxis__custom--TwoThousandTwentyATMFacilityMember__dei--LegalEntityAxis__custom--AGPAllianceGlobalPartnersMember_zMPzA3r1WGB6" title="Proceeds from initial public offering">50.0</span> million. From inception of the 2020 ATM Facility through July 31, 2021, the Company had sold
and issued an aggregate of <span id="xdx_90C_eus-gaap--SaleOfStockNumberOfSharesIssuedInTransaction_c20201120__20210731__us-gaap--TypeOfArrangementAxis__custom--TwoThousandTwentyATMFacilityMember__dei--LegalEntityAxis__custom--AGPAllianceGlobalPartnersMember_zKRr4JJL81v1" 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_c20201120__20210731__us-gaap--TypeOfArrangementAxis__custom--TwoThousandTwentyATMFacilityMember__dei--LegalEntityAxis__custom--AGPAllianceGlobalPartnersMember_z5U6IZelsDI7" 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_c20210731__us-gaap--TypeOfArrangementAxis__custom--TwoThousandTwentyATMFacilityMember__dei--LegalEntityAxis__custom--AGPAllianceGlobalPartnersMember_zixF8yZtjF8k" title="Combined purchase price per share">2.91</span> per share and paid AGP a sales commission of approximately $<span id="xdx_90C_ecustom--PaymentOfSalesCommission_pn5n6_c20201120__20210731__us-gaap--TypeOfArrangementAxis__custom--TwoThousandTwentyATMFacilityMember__dei--LegalEntityAxis__custom--AGPAllianceGlobalPartnersMember_zfuCnYo9XF2k" 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_90B_eus-gaap--ProceedsFromIssuanceOfCommonStock_pn5n6_c20220109__20220110__us-gaap--TypeOfArrangementAxis__custom--TwoThousandTwentyATMFacilityMember_zj9zIP5mH8A9">25.0</span> million (or an aggregate of $<span id="xdx_900_eus-gaap--SaleOfStockConsiderationReceivedPerTransaction_pn5n6_c20220109__20220110__us-gaap--TypeOfArrangementAxis__custom--TwoThousandTwentyATMFacilityMember_zhj5p8ukrZY5" title="Proceeds from issuance or sale of equity, net of issuance costs">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-top: 0pt; margin-bottom: 0pt; 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; text-align: center; margin-top: 0pt; margin-bottom: 0pt"><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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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 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_900_ecustom--StockIssuedDuringPeriodValueIssuedForCommitmentFee_c20200914__20200918__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_pn5n6" 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_90A_ecustom--PercentageOfOutstandingCommonStockLimitForShareholderApproval_pid_c20200914__20200918__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_ztKAHqxE0y91" 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 <span id="xdx_90F_ecustom--PercentageOfOutstandingCommonStockLimitForShareholderApproval_pid_c20200914__20200918__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_zPa8PIyPSq39" title="Percentage of outstanding common stock">19.99%</span> limit was <span id="xdx_90C_ecustom--StockIssuedDuringPeriodSharesCanBeIssuedBasedUponOutstandingPercentage_pid_c20200914__20200918__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_zluDrNHL1co7" 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_906_ecustom--NumberOfAdditionalSharesThatCanBeIssuedUponShareholderApproval_pid_c20201222__20201223__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_zr5rnf3WR5Sg" title="Additional sales of common stock shares sold">9,864,706</span> additional shares of common stock which exceeds the <span id="xdx_901_ecustom--PercentageOfOutstandingCommonStockLimitForShareholderApproval_pid_c20201222__20201223__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_zSoDmSyj3Za7" title="Percentage of outstanding common stock">19.99%</span> limit of the outstanding common stock on
the date of the agreement. Through July 31, 2022, the Company had sold an aggregate of <span id="xdx_90D_eus-gaap--SaleOfStockNumberOfSharesIssuedInTransaction_c20220501__20220731__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_zZ0vNTGG2Enh" title="Number of common stock shares sold">3,722,251</span> shares of common stock with an aggregate
market value of $<span id="xdx_90C_eus-gaap--SaleOfStockConsiderationReceivedPerTransaction_pn5n6_c20220501__20220731__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_zrVcGjMij673" title="Proceeds from issuance or sale of equity, net of issuance costs">11.8</span> million at an average price of $<span id="xdx_908_eus-gaap--SaleOfStockPricePerShare_iI_c20220731__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_zEl1EohcoVla" title="Combined purchase price per share">3.17</span> per share pursuant to this common stock purchase agreement with approximately
$<span id="xdx_905_ecustom--SaleOfStockConsiderationReceivedPerTransactionRemaining_pn5n6_c20220501__20220731__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_zvGYHaQByGIj" title="Proceeds from issuance or sale of equity, net of issuance costs">1.0</span> million remaining on the facility as of July 31, 2022.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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;">v3.22.2.2</span><table class="report" border="0" cellspacing="2" id="idm140132829717376">
<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">3 Months Ended</th>
</tr>
<tr><th class="th"><div>Jul. 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="Show.showAR( this, 'defref_us-gaap_AccountingPoliciesAbstract', window );"><strong>Accounting Policies [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
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</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_SignificantAccountingPoliciesTextBlock', window );">Summary of Significant Accounting Policies</a></td>
<td class="text"><p id="xdx_802_eus-gaap--SignificantAccountingPoliciesTextBlock_zUcK4VwVpzTi" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(2)
<span id="xdx_82A_zBU4H5rCVvF4">Summary of Significant Accounting Policies</span></b></span></p>

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

<p id="xdx_84D_eus-gaap--ConsolidationPolicyTextBlock_zy0U9TtxwgZ6" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>(a)
<span id="xdx_862_zOOXfzGk1VWc">Consolidation</span></i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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, Ocean Power Technologies
Ltd. in the United Kingdom, and Ocean Power Technologies (Australasia) Pty Ltd. in Australia (&#8220;OPT-A&#8221;). OPT-A is in the process
of being liquidated. All documents have been filed with the Australian Tax Organization and the Company expects this to be completed
in the second quarter of the current fiscal year. All significant intercompany accounts and transactions have been eliminated in consolidation.</span></p>

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

<p id="xdx_844_eus-gaap--UseOfEstimates_zg0FcSINI2wa" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>(b)
<span id="xdx_86E_zliy00geaJul">Use of Estimates</span></i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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, stock-based
compensation, 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 hours and costs
to complete projects 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-top: 0pt; margin-bottom: 0pt; margin-left: 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--CashAndCashEquivalentsRestrictedCashAndCashEquivalentsPolicy_zaxnFNkuk5ba" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>(c)
<span id="xdx_86C_zoAE1d1Nc6Wf">Cash, Cash Equivalents, Restricted, Security Agreements and Marketable Securities</span></i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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 or in marketable securities. The following table summarizes cash and cash equivalents
as of July 31, 2022 and April 30, 2022:</span></p>

<p id="xdx_899_eus-gaap--ScheduleOfCashAndCashEquivalentsTableTextBlock_z2mEzmhIBMT7" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_8B4_zeno9R6Dqtwd" style="display: none">Schedule of Cash and Cash Equivalents</span></span></p>

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    <td>&#160;</td><td>&#160;</td>
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    <td style="width: 60%; text-align: left">Checking and savings accounts</td><td style="width: 2%">&#160;</td>
    <td style="width: 1%; text-align: left">$</td><td id="xdx_98A_eus-gaap--CashAndCashEquivalentsAtCarryingValue_iI_pn3n3_c20220731__us-gaap--CashAndCashEquivalentsAxis__custom--CheckingAndSavingsAccountsMember_zgvAdKuStM47" style="width: 16%; text-align: right" title="Cash and cash equivalents">2,029</td><td style="width: 1%; text-align: left">&#160;</td><td style="width: 2%">&#160;</td>
    <td style="width: 1%; text-align: left">$</td><td id="xdx_98A_eus-gaap--CashAndCashEquivalentsAtCarryingValue_iI_pn3n3_c20220430__us-gaap--CashAndCashEquivalentsAxis__custom--CheckingAndSavingsAccountsMember_zhIqmUCtNui9" style="width: 16%; text-align: right" title="Cash and cash equivalents">1,815</td><td style="width: 1%; text-align: left">&#160;</td></tr>
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    <td style="border-bottom: Black 1.5pt solid; text-align: left">&#160;</td><td id="xdx_982_eus-gaap--CashAndCashEquivalentsAtCarryingValue_iI_pn3n3_c20220731__us-gaap--CashAndCashEquivalentsAxis__us-gaap--MoneyMarketFundsMember_zxC9aaEj0T74" style="border-bottom: Black 1.5pt solid; text-align: right" title="Cash and cash equivalents">7,147</td><td style="padding-bottom: 1.5pt; text-align: left">&#160;</td><td style="padding-bottom: 1.5pt">&#160;</td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left">&#160;</td><td id="xdx_980_eus-gaap--CashAndCashEquivalentsAtCarryingValue_iI_pn3n3_c20220430__us-gaap--CashAndCashEquivalentsAxis__us-gaap--MoneyMarketFundsMember_zfhRJOMZL0Kf" style="border-bottom: Black 1.5pt solid; text-align: right" title="Cash and cash equivalents">6,070</td><td style="padding-bottom: 1.5pt; text-align: left">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="padding-bottom: 2.5pt">&#160;</td><td style="padding-bottom: 2.5pt">&#160;</td>
    <td style="border-bottom: Black 2.5pt double; text-align: left">$</td><td id="xdx_985_eus-gaap--CashAndCashEquivalentsAtCarryingValue_iI_pn3n3_c20220731_zk7z4N27ervh" style="border-bottom: Black 2.5pt double; text-align: right" title="Cash and cash equivalents">9,176</td><td style="padding-bottom: 2.5pt; text-align: left">&#160;</td><td style="padding-bottom: 2.5pt">&#160;</td>
    <td style="border-bottom: Black 2.5pt double; text-align: left">$</td><td id="xdx_98E_eus-gaap--CashAndCashEquivalentsAtCarryingValue_iI_pn3n3_c20220430_zlkkwhY2mE2i" style="border-bottom: Black 2.5pt double; text-align: right" title="Cash and cash equivalents">7,885</td><td style="padding-bottom: 2.5pt; text-align: left">&#160;</td></tr>
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<p id="xdx_8AE_zpOVZJDTs09h" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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_906_eus-gaap--Deposits_iI_c20220731__us-gaap--TypeOfArrangementAxis__custom--RestrictedCashAndSecurityAgreementsMember__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--SantanderBankMember__us-gaap--ShortTermDebtTypeAxis__us-gaap--LetterOfCreditMember_zmjus2Yp2fMc" title="Deposits">154,000</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 the bank.</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">&#160;</span></p>




<p style="font: 10pt Times New Roman, Times, Serif; text-align: center; 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Santander
also issued a letter of credit to subsidiaries of Enel Green Power (&#8220;EGP&#8221;) pursuant to the Company&#8217;s contracts with
EGP. This letter of credit was originally issued in the amount of $<span id="xdx_904_eus-gaap--LettersOfCreditOutstandingAmount_iI_c20200831__us-gaap--TypeOfArrangementAxis__custom--RestrictedCashAndSecurityAgreementsMember__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--SantanderBankMember__us-gaap--ShortTermDebtTypeAxis__custom--LetterOneMember_zITRrjl16il7" title="Letters of credit outstanding, Amount">645,000</span> and was reduced to $<span id="xdx_908_eus-gaap--LettersOfCreditOutstandingAmount_iI_pp0p0_c20200831__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--SantanderBankMember__us-gaap--ShortTermDebtTypeAxis__custom--LetterTwoMember__us-gaap--AwardDateAxis__custom--AugustTwentyTwentyMember_zPryBf3RlNqg">323,000</span> in August 2020. The letter of
credit will be reduced by an additional $<span id="xdx_909_ecustom--LettersOfCreditIssuedAmount_iI_pp0p0_c20220731__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--SantanderBankMember__us-gaap--ShortTermDebtTypeAxis__custom--LetterTwoMember_zfWIdANCv4H7">258,000</span> once the PowerBuoy&#174; (&#8220;PB3&#8221;) and its accompanying systems pass final
acceptance testing. The remaining restricted amount of $<span id="xdx_90F_ecustom--LettersOfCreditIssuedAmount_iI_c20220731__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--SantanderBankMember_zEt4FZkuNJFk" title="Letters of credit issued amount">65,000</span> will be released 12 months after the buoy is fully deployed.</span></p>

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

<p id="xdx_894_eus-gaap--ScheduleOfRestrictedCashAndCashEquivalentsTextBlock_zK4GorEL60m1" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_8BD_zxublpbXDUyi" 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="display: none; vertical-align: bottom; background-color: White">
    <td style="text-align: left">&#160;</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td id="xdx_493_20220731_zh4GFdLidXm8" style="text-align: right">&#160;</td><td style="text-align: left">&#160;</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td id="xdx_496_20220430" style="text-align: right">&#160;</td><td style="text-align: left">&#160;</td></tr>
<tr style="vertical-align: bottom">
    <td>&#160;</td><td style="font-weight: bold; padding-bottom: 1.5pt">&#160;</td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center">July 31, 2022</td><td style="padding-bottom: 1.5pt; font-weight: bold">&#160;</td><td style="font-weight: bold; padding-bottom: 1.5pt">&#160;</td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center">April 30, 2022</td><td style="padding-bottom: 1.5pt; font-weight: bold">&#160;</td></tr>
  <tr style="vertical-align: bottom">
    <td>&#160;</td><td>&#160;</td>
    <td colspan="6" style="text-align: center">(in thousands)</td><td>&#160;</td></tr>
  <tr id="xdx_40E_eus-gaap--CashAndCashEquivalentsAtCarryingValue_iI_pn3n3" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="width: 60%; text-align: left">Cash and cash equivalents</td><td style="width: 2%">&#160;</td>
    <td style="width: 1%; text-align: left">$</td><td style="width: 16%; text-align: right">9,176</td><td style="width: 1%; text-align: left">&#160;</td><td style="width: 2%">&#160;</td>
    <td style="width: 1%; text-align: left">$</td><td style="width: 16%; text-align: right">7,885</td><td style="width: 1%; text-align: left">&#160;</td></tr>
  <tr id="xdx_401_eus-gaap--RestrictedCashCurrent_iI_pn3n3" style="vertical-align: bottom; background-color: White">
    <td style="text-align: left">Restricted cash- short term</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td style="text-align: right">258</td><td style="text-align: left">&#160;</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td style="text-align: right">258</td><td style="text-align: left">&#160;</td></tr>
  <tr id="xdx_40F_eus-gaap--RestrictedCashNoncurrent_iI_pn3n3" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left; padding-bottom: 1.5pt">Restricted cash- long term</td><td style="padding-bottom: 1.5pt">&#160;</td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left">&#160;</td><td style="border-bottom: Black 1.5pt solid; text-align: right">219</td><td style="padding-bottom: 1.5pt; text-align: left">&#160;</td><td style="padding-bottom: 1.5pt">&#160;</td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left">&#160;</td><td style="border-bottom: Black 1.5pt solid; text-align: right">219</td><td style="padding-bottom: 1.5pt; text-align: left">&#160;</td></tr>
  <tr id="xdx_40B_eus-gaap--CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_iI_pn3n3_zPoAY8k6bTKg" style="vertical-align: bottom; background-color: White">
    <td style="padding-bottom: 2.5pt"><span style="display: none; font-family: Times New Roman, Times, Serif; font-size: 10pt">Cash, cash equivalents,
    restricted cash and restricted cash equivalents</span></td><td style="padding-bottom: 2.5pt">&#160;</td>
    <td style="border-bottom: Black 2.5pt double; text-align: left">$</td><td style="border-bottom: Black 2.5pt double; text-align: right">9,653</td><td style="padding-bottom: 2.5pt; text-align: left">&#160;</td><td style="padding-bottom: 2.5pt">&#160;</td>
    <td style="border-bottom: Black 2.5pt double; text-align: left">$</td><td style="border-bottom: Black 2.5pt double; text-align: right">8,362</td><td style="padding-bottom: 2.5pt; text-align: left">&#160;</td></tr>
  </table>

<p id="xdx_8AF_zb501wK86kH2" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><i>Marketable
Securities</i></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">During
fiscal 2022, the Company acquired investment securities through Charles Schwab Bank. As of July 31, 2022 and April 30, 2022, their
value was approximately $<span id="xdx_90B_eus-gaap--AlternativeInvestment_iI_pn5n6_c20220731_zK7gerDVwuha" title="Investment securities">42.7</span>
million and $<span id="xdx_901_eus-gaap--AlternativeInvestment_iI_pn5n6_c20220430_zvnTCS0Curmf">49.4</span> million, respectively.
All marketable securities consist of corporate bonds, government agency bonds, or U.S. Treasury Notes and Bonds, are investment
grade rated or better, and mature within 12 months. The Company has the means and intends to hold all investments to maturity, and
as such are classified as held-to-maturity investments and carried at amortized cost. The total recognized interest expense on the
premium we paid for the securities as of July 31, 2022 and 2021 is approximately <span>$<span id="xdx_903_eus-gaap--InvestmentIncomeNetAmortizationOfDiscountAndPremium_pn5n6_c20220501__20220731_z8CzZCnSUQcd" title="Discount and premium">0.1</span>
million and <span id="xdx_908_eus-gaap--InvestmentIncomeNetAmortizationOfDiscountAndPremium_dc_c20210501__20210731_zdPYMZcgV65l">zero</span></span>,
respectively, on an amortized cost basis of approximately $<span id="xdx_907_eus-gaap--TradingSecuritiesDebtAmortizedCost_iI_pn5n6_c20220731_zPQbCWbzjE0i" title="Investment owned at cost">0.3</span>
million and <span id="xdx_90E_eus-gaap--TradingSecuritiesDebtAmortizedCost_iI_dc_c20210731_zkobbCmIcW3">zero</span>, respectively.
Additionally, there has been no impairment on these investments.</span></p>

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

<p id="xdx_89C_eus-gaap--UnrealizedGainLossOnInvestmentsTableTextBlock_zy0USolL0Yg8" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
following table summarizes the Company&#8217;s marketable securities as of July 31, 2022:</span></p>

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

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_8B5_z9L3fZ3W0lYc" style="display: none">Schedule of Investments and Unrealized Gains/Losses</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="border-bottom: Black 1.5pt solid; font-weight: bold">Category (in thousands)</td><td style="padding-bottom: 1.5pt; font-weight: bold">&#160;</td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center">Market Value</td><td style="padding-bottom: 1.5pt; font-weight: bold">&#160;</td><td style="padding-bottom: 1.5pt; font-weight: bold">&#160;</td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center">Unrealized <br/>
Gains (Losses)</td><td style="padding-bottom: 1.5pt; font-weight: bold">&#160;</td><td style="padding-bottom: 1.5pt; font-weight: bold">&#160;</td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center">Adjusted Cost</td><td style="padding-bottom: 1.5pt; font-weight: bold">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="width: 40%; text-align: left">Corporate Bonds</td><td style="width: 2%">&#160;</td>
    <td style="width: 1%; text-align: left">$</td><td id="xdx_983_eus-gaap--MoneyMarketFundsAtCarryingValue_iI_pn3n3_c20220731__us-gaap--InvestmentTypeAxis__custom--CorporateBondsMember_zbVEsGcwCJ3e" style="width: 16%; text-align: right">31,853</td><td style="width: 1%; text-align: left">&#160;</td><td style="width: 2%">&#160;</td>
    <td style="width: 1%; text-align: left">$</td><td id="xdx_989_eus-gaap--UnrealizedGainLossOnInvestments_pn3n3_c20220501__20220731__us-gaap--InvestmentTypeAxis__custom--CorporateBondsMember_zMPadx01Tevd" style="width: 16%; text-align: right" title="Unrealized Gains (Losses)">151</td><td style="width: 1%; text-align: left"/><td style="width: 2%">&#160;</td>
    <td style="width: 1%; text-align: left">$</td><td id="xdx_98D_eus-gaap--InvestmentOwnedAtCost_iI_pn3n3_c20220731__us-gaap--InvestmentTypeAxis__custom--CorporateBondsMember_ztHmMv2Rflw8" style="width: 16%; text-align: right" title="Total Cost">32,004</td><td style="width: 1%; text-align: left">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td style="text-align: left">Government Bonds &amp; Notes</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td id="xdx_987_eus-gaap--MoneyMarketFundsAtCarryingValue_iI_pn3n3_c20220731__us-gaap--InvestmentTypeAxis__custom--GovernmentBondsandNotesMember_zfwFI7aojBy7" style="text-align: right">7,986</td><td style="text-align: left">&#160;</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td id="xdx_984_eus-gaap--UnrealizedGainLossOnInvestments_pn3n3_c20220501__20220731__us-gaap--InvestmentTypeAxis__custom--GovernmentBondsandNotesMember_z5g7p8zQmrRh" style="text-align: right"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0">15</p></td><td style="text-align: left"/><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td id="xdx_989_eus-gaap--InvestmentOwnedAtCost_iI_pn3n3_c20220731__us-gaap--InvestmentTypeAxis__custom--GovernmentBondsandNotesMember_zF5pwijoQtUi" style="text-align: right">8,001</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">Government Agency</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td id="xdx_98E_eus-gaap--MoneyMarketFundsAtCarryingValue_iI_pn3n3_c20220731__us-gaap--InvestmentTypeAxis__custom--GovernmentAgencyMember_zWw5N1mEYX6h" style="text-align: right">2,498</td><td style="text-align: left">&#160;</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td id="xdx_989_eus-gaap--UnrealizedGainLossOnInvestments_pn3n3_c20220501__20220731__us-gaap--InvestmentTypeAxis__custom--GovernmentAgencyMember_zeDcORknoR4l" style="text-align: right">11</td><td style="text-align: left"/><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td id="xdx_98B_eus-gaap--InvestmentOwnedAtCost_iI_pn3n3_c20220731__us-gaap--InvestmentTypeAxis__custom--GovernmentAgencyMember_zO4lZrYtZWm9" style="text-align: right">2,509</td><td style="text-align: left">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td style="padding-bottom: 1.5pt; text-align: left">Accrued Interest</td><td style="padding-bottom: 1.5pt">&#160;</td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left">&#160;</td><td id="xdx_987_eus-gaap--MoneyMarketFundsAtCarryingValue_iI_pn3n3_c20220731__us-gaap--InvestmentTypeAxis__custom--AccuredInterestMember_z47q2mQiLDw" style="border-bottom: Black 1.5pt solid; text-align: right">311</td><td style="padding-bottom: 1.5pt; text-align: left">&#160;</td><td style="padding-bottom: 1.5pt">&#160;</td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left">&#160;</td><td id="xdx_982_eus-gaap--UnrealizedGainLossOnInvestments_pn3n3_c20220501__20220731__us-gaap--InvestmentTypeAxis__custom--AccuredInterestMember_zT3RaadU94yi" style="border-bottom: Black 1.5pt solid; text-align: right"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0">(101</p></td><td style="padding-bottom: 1.5pt; text-align: left">)</td><td style="padding-bottom: 1.5pt">&#160;</td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left">&#160;</td><td id="xdx_987_eus-gaap--InvestmentOwnedAtCost_iI_pn3n3_c20220731__us-gaap--InvestmentTypeAxis__custom--AccuredInterestMember_zdvAi8j3uMvc" style="border-bottom: Black 1.5pt solid; text-align: right">210</td><td style="padding-bottom: 1.5pt; text-align: left">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left; padding-bottom: 2.5pt">Total Marketable Securities</td><td style="padding-bottom: 2.5pt">&#160;</td>
    <td style="border-bottom: Black 2.5pt double; text-align: left">$</td><td id="xdx_98C_eus-gaap--MoneyMarketFundsAtCarryingValue_iI_pn3n3_c20220731_zakQom9mo99e" style="border-bottom: Black 2.5pt double; text-align: right" title="Market Value">42,648</td><td style="padding-bottom: 2.5pt; text-align: left">&#160;</td><td style="padding-bottom: 2.5pt">&#160;</td>
    <td style="border-bottom: Black 2.5pt double; text-align: left">$</td><td id="xdx_98F_eus-gaap--UnrealizedGainLossOnInvestments_pn3n3_c20220501__20220731_zETDZCRAGEye" style="border-bottom: Black 2.5pt double; text-align: right" title="Unrealized Gains (Losses)">(76</td><td style="padding-bottom: 2.5pt; text-align: left">)</td><td style="padding-bottom: 2.5pt">&#160;</td>
    <td style="border-bottom: Black 2.5pt double; text-align: left">$</td><td id="xdx_986_eus-gaap--InvestmentOwnedAtCost_iI_pn3n3_c20220731_zV6uJbdPQM6i" style="border-bottom: Black 2.5pt double; text-align: right" title="Total Cost">42,724</td><td style="padding-bottom: 2.5pt; text-align: left">&#160;</td></tr>
  </table>

<p id="xdx_8A0_z93hOAE3fV8j" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>&#160;</i></b></span></p>

<p id="xdx_843_eus-gaap--ConcentrationRiskCreditRisk_zhyngZhx0eec" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>(d)
<span id="xdx_86A_zd4lzaSIJqL5">Concentration of Credit Risk</span></i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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 trade accounts receivable, marketable securities
and cash. The Company believes that its credit risk is limited because the Company&#8217;s current contracts are with companies with
a reliable payment history. The Company invests its excess cash in a money market fund and short term held-to maturity investment and
does not believe that it is exposed to any significant risks related to its cash accounts, money market fund, or held-to maturity investments.
Cash is also maintained at foreign financial institutions. Cash in foreign financial institutions as of July 31, 2022 was approximately
$<span id="xdx_901_eus-gaap--CashAndCashEquivalentsAtCarryingValue_iI_c20220731__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--ForeignFinancialInstitutionsMember_zSrmd6XLlCah" title="Cash and cash equivalents">24,000</span>.</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">&#160;</span></p>




<p style="font: 10pt Times New Roman, Times, Serif; text-align: center; 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">For the three months ended July 31, 2022 and 2021, the Company had three
and two customers whose revenues accounted for at least 10% of the Company&#8217;s consolidated revenues, respectively. These revenue
accounted for approximately <span id="xdx_90A_eus-gaap--ConcentrationRiskPercentage1_pid_dp_uPure_c20220501__20220731__us-gaap--ConcentrationRiskByBenchmarkAxis__us-gaap--SalesRevenueNetMember__us-gaap--ConcentrationRiskByTypeAxis__us-gaap--CustomerConcentrationRiskMember__srt--MajorCustomersAxis__custom--ThreeAndTwoCustomersMember_zZULkty2L83i" title="Concentration risk percentage">69%</span> and <span id="xdx_90E_eus-gaap--ConcentrationRiskPercentage1_pid_dp_uPure_c20210501__20210731__us-gaap--ConcentrationRiskByBenchmarkAxis__us-gaap--SalesRevenueNetMember__us-gaap--ConcentrationRiskByTypeAxis__us-gaap--CustomerConcentrationRiskMember__srt--MajorCustomersAxis__custom--ThreeAndTwoCustomersMember_zWyNdRNlwj2d" title="Concentration risk percentage">88%</span> of the Company&#8217;s total revenue for the respective periods.</span></p>

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


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

<p id="xdx_844_eus-gaap--ShareBasedCompensationOptionAndIncentivePlansPolicy_zOFgg3OGWX34" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>(e)
<span id="xdx_861_zuRz3CqFkZa6">Share-Based Compensation</span></i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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
aggregate share-based compensation expense recorded in the Consolidated Statements of Operations for the three months ended July 31,
2022 and 2021 was approximately $<span id="xdx_904_eus-gaap--EmployeeBenefitsAndShareBasedCompensation_pn5n6_c20220501__20220731_zYP0Yjn2N4De" title="Share based compensation">0.3</span> million and $<span id="xdx_90C_eus-gaap--EmployeeBenefitsAndShareBasedCompensation_pn5n6_c20210501__20210731_zcJcrwZiD7m3" title="Share based compensation">0.4</span> million, respectively.</span></p>

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

<p id="xdx_84C_eus-gaap--RevenueFromContractWithCustomerPolicyTextBlock_zmUPHVYHhezi" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(f)
<i><span id="xdx_867_zjoHurDamM4d">Revenue Recognition</span></i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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 July 31, 2022 and 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 in costs of goods sold, and regular shipping and handling activities charged to operating
expenses.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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 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 labor hours 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-top: 0pt; margin-bottom: 0pt; 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; text-align: center; 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-top: 0pt; margin-bottom: 0pt; margin-left: 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, fixed-price contracts, time and material agreements, or lease agreements. 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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 three-month periods ended July 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Time
and materials agreements are billed based solely on the cost of time spent working on the contract and the material used.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">As
of July 31, 2022, the Company&#8217;s total remaining performance obligations, also referred to as backlog, totaled $<span id="xdx_902_eus-gaap--RevenueRemainingPerformanceObligation_iI_pn5n6_c20220731_zKAvsRrnxtCe" title="Revenue remaining performance obligation">0.3</span> million. The
Company expects to recognize <span id="xdx_90E_ecustom--RevenueRemainingPerformancesObligationPercentage_pid_dp_uPure_c20220501__20220731_zTXiNH9SEdVg" title="Revenue remaining performance obligation, percentage">100</span>%, or $<span id="xdx_907_eus-gaap--RevenueRemainingPerformanceObligation_iI_pn5n6_c20220731_zZI2Z4Rjj0u" title="Revenue remaining performance obligation">0.3</span> million, of the remaining performance obligations as revenue over the next twelve months.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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&#174;&#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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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 operating leases.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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 Statement of Operations.</span></p>

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

<p id="xdx_84F_eus-gaap--EarningsPerSharePolicyTextBlock_znJF9QQGkLy5" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>(g)
<span id="xdx_866_zf9WVT2MM7E9">Net Loss per Common Share</span></i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Basic
and diluted net loss per 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 period. 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 the basic earnings per share number. Due
to the Company&#8217;s net losses, potentially dilutive securities, consisting of options to purchase shares of common stock, potential
exercises of warrants on common stock and unvested restricted stock issued to employees and non-employee directors, were excluded from
the diluted loss per share calculation due to their anti-dilutive effect.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">In
computing diluted net loss per share on the Consolidated Statement of Operations, potential exercises of warrants on 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_pid_c20220501__20220731_zlWXvMhyVAb1" title="Antidilutive securities earnings per share">6,378,218</span>
and <span id="xdx_90C_eus-gaap--AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_pid_c20210501__20210731_zG7Kn0DuRnTa">5,243,647</span> for the three months ended July 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-top: 0pt; margin-bottom: 0pt; margin-left: 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--NewAccountingPronouncementsPolicyPolicyTextBlock_zLTdh0sXipBf" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>(h)
<span id="xdx_861_zCViT2nSy448">Recently Issued Accounting Standards</span></i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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 the adoption of ASU 2016-13 will have on its consolidated financial statements.</span></p>

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<span style="display: none;">v3.22.2.2</span><table class="report" border="0" cellspacing="2" id="idm140132829667856">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Account Receivable, Contract Assets and Contract Liabilities<br></strong></div></th>
<th class="th" colspan="1">3 Months Ended</th>
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<tr><th class="th"><div>Jul. 31, 2022</div></th></tr>
<tr class="re">
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<td class="text">&#160;<span></span>
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<td class="text"><p id="xdx_809_ecustom--AccountReceivableContractAssetsAndContractLiabilitiesTextBlock_zyNJuQPXHy37" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(3)
<span id="xdx_825_zkZQhiADfjKi">Account Receivable, Contract Assets and Contract Liabilities</span></b></span></p>

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

<p id="xdx_897_ecustom--ScheduleOfAccountsReceivableContractAssetsAndContractLiabilitiesTableTextBlock_zShJTKBeI9bd" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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, contract assets and contract liabilities from
contracts with customers:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_8B9_zrUmZ0Lcunb2" style="display: none">Schedule of Accounts Receivable, Contract Assets and Contract Liabilities</span></span></p>

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<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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
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value of such receivables represents their estimated realizable value.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Contract
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<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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 conditional on completing additional
tasks or services for a performance obligation. The increase in contract assets is primarily a result of services performed relating
to MAR projects for which revenue was recognized but not billed during the three months ended July 31, 2022.</span></p>

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

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changes in the contract assets balances during the period were as follows:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_8B0_zpqBHf41XgX6" style="display: none">Schedule of Significant Changes in Contract assets and Contract Liabilities</span></span></p>

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<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">&#160;</span></p>




<p style="font: 10pt Times New Roman, Times, Serif; text-align: center; margin-top: 0pt; margin-bottom: 0pt"><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-top: 0pt; margin-bottom: 0pt; margin-left: 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><i>Contract
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<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Contract
liabilities consist of amounts invoiced to customers in excess of revenue recognized. The decrease in contract liabilities is primarily
due to payment for MAR projects during the three months ended July 31, 2022 for which we have not recognized revenue.</span></p>

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

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July 31, 2022</td><td style="padding-bottom: 1.5pt; font-weight: bold">&#160;</td></tr>
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    <td style="width: 78%; text-align: left">Revenue recognized that was included in the contract liabilities balance as of the beginning of the period</td><td style="width: 2%">&#160;</td>
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    <td style="text-align: left; padding-bottom: 2.5pt">Net change in contract liabilities</td><td style="padding-bottom: 2.5pt">&#160;</td>
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<span style="display: none;">v3.22.2.2</span><table class="report" border="0" cellspacing="2" id="idm140132829702800">
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<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Inventory<br></strong></div></th>
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<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_InventoryDisclosureTextBlock', window );">Inventory</a></td>
<td class="text"><p id="xdx_804_eus-gaap--InventoryDisclosureTextBlock_z0YtUOzOSBy4" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(4)
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<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>&#160;</b></span></p>

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<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_InventoryDisclosureAbstract</td>
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<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>The entire disclosure for inventory. Includes, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the classes of inventory, and the nature of the cost elements included in inventory.</p></div>
<a href="javascript:void(0);" onclick="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 330<br> -URI https://asc.fasb.org/topic&amp;trid=2126998<br></p></div>
<a href="javascript:void(0);" onclick="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>duration</td>
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<span style="display: none;">v3.22.2.2</span><table class="report" border="0" cellspacing="2" id="idm140132827326208">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Other Current Assets<br></strong></div></th>
<th class="th" colspan="1">3 Months Ended</th>
</tr>
<tr><th class="th"><div>Jul. 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="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>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_OtherCurrentAssetsTextBlock', window );">Other Current Assets</a></td>
<td class="text"><p id="xdx_801_eus-gaap--OtherCurrentAssetsTextBlock_zbO8TevmB3f8" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(5)
<span id="xdx_822_zwei4eI66xs5">Other Current Assets</span></b></span></p>

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

<p id="xdx_89C_eus-gaap--ScheduleOfOtherCurrentAssetsTableTextBlock_z4UEzqgKoUqh" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Other
current assets consisted of the following at July 31, 2022 and April 30, 2022:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span id="xdx_8B8_ztn9j7Q0lks1" style="display: none">Schedule of Other Current Assets</span></p>

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    <td style="text-align: left">&#160;</td><td id="xdx_493_20220731_zdzPESDBkpG5" style="text-align: right">&#160;</td><td style="text-align: left">&#160;</td><td>&#160;</td>
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    <td style="padding-bottom: 2.5pt"><span style="display: none; font-family: Times New Roman, Times, Serif; font-size: 10pt">Total other current assets</span></td><td style="padding-bottom: 2.5pt">&#160;</td>
    <td style="border-bottom: Black 2.5pt double; text-align: left">$</td><td style="border-bottom: Black 2.5pt double; text-align: right">480</td><td style="padding-bottom: 2.5pt; text-align: left">&#160;</td><td style="padding-bottom: 2.5pt">&#160;</td>
    <td style="border-bottom: Black 2.5pt double; text-align: left">$</td><td style="border-bottom: Black 2.5pt double; text-align: right">467</td><td style="padding-bottom: 2.5pt; text-align: left">&#160;</td></tr>
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<p style="font: 10pt Times New Roman, Times, Serif; text-align: center; margin-top: 0pt; margin-bottom: 0pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>&#160;</b></span></p>

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<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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>
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<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>The entire disclosure for other current assets.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="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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<span style="display: none;">v3.22.2.2</span><table class="report" border="0" cellspacing="2" id="idm140132827355792">
<tr>
<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">3 Months Ended</th>
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<tr><th class="th"><div>Jul. 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="Show.showAR( this, 'defref_us-gaap_PropertyPlantAndEquipmentAbstract', window );"><strong>Property, Plant and Equipment [Abstract]</strong></a></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="Show.showAR( this, 'defref_us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock', window );">Property and Equipment, net</a></td>
<td class="text"><p id="xdx_803_eus-gaap--PropertyPlantAndEquipmentDisclosureTextBlock_zOyb4TTPICj1" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(6)
<span id="xdx_820_z8r0xGu0VFWb">Property and Equipment, net</span></b></span></p>

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

<p id="xdx_894_eus-gaap--PropertyPlantAndEquipmentTextBlock_zxlhGehTRLG1" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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 July 31, 2022 and April 30, 2022 consisted of the following:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span id="xdx_8BB_zJcUP3T9ROFf" style="display: none">Schedule of Components of Property and Equipment</span></p>

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    <td style="text-align: left">&#160;</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td id="xdx_495_20220731_zucZSzWzrs26" style="text-align: right">&#160;</td><td style="text-align: left">&#160;</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td id="xdx_498_20220430_zjSo9MLnuozb" style="text-align: right">&#160;</td><td style="text-align: left">&#160;</td></tr>
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    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center">April 30, 2022</td><td style="padding-bottom: 1.5pt; font-weight: bold">&#160;</td></tr>
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    <td>&#160;</td><td>&#160;</td>
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    <td style="width: 1%; text-align: left">$</td><td style="width: 16%; text-align: right">615</td><td style="width: 1%; text-align: left">&#160;</td></tr>
  <tr id="xdx_402_eus-gaap--PropertyPlantAndEquipmentGross_iI_pn3n3_hus-gaap--PropertyPlantAndEquipmentByTypeAxis__custom--ComputerEquipmentAndSoftwareMember_zYF0b9ahphlg" style="vertical-align: bottom; background-color: White">
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    <td style="border-bottom: Black 1.5pt solid; text-align: left">&#160;</td><td style="border-bottom: Black 1.5pt solid; text-align: right">15</td><td style="padding-bottom: 1.5pt; text-align: left">&#160;</td></tr>
  <tr id="xdx_407_eus-gaap--PropertyPlantAndEquipmentGross_iI_pn3n3_maPPAENzI8F_zk2rQdmiaA99" style="vertical-align: bottom; background-color: White">
    <td><span style="display: none; font-family: Times New Roman, Times, Serif; font-size: 10pt">Property and equipment, gross</span></td><td>&#160;</td>
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    <td style="text-align: left; padding-bottom: 1.5pt">Less: accumulated depreciation</td><td style="padding-bottom: 1.5pt">&#160;</td>
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    <td style="border-bottom: Black 1.5pt solid; text-align: left">&#160;</td><td style="border-bottom: Black 1.5pt solid; text-align: right">(1,585</td><td style="padding-bottom: 1.5pt; text-align: left">)</td></tr>
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    <td style="border-bottom: Black 2.5pt double; text-align: left">$</td><td style="border-bottom: Black 2.5pt double; text-align: right">445</td><td style="padding-bottom: 2.5pt; text-align: left">&#160;</td></tr>
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<p id="xdx_8A9_z01grGmxzCuk" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Depreciation
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<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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="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;">v3.22.2.2</span><table class="report" border="0" cellspacing="2" id="idm140132932476640">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Leases<br></strong></div></th>
<th class="th" colspan="1">3 Months Ended</th>
</tr>
<tr><th class="th"><div>Jul. 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="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="Show.showAR( this, 'defref_us-gaap_LesseeOperatingLeasesTextBlock', window );">Leases</a></td>
<td class="text"><p id="xdx_805_eus-gaap--LesseeOperatingLeasesTextBlock_z7KGcPhmCYbh" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(7)
<span id="xdx_828_ziq1h4P1HFS8">Leases</span></b></span></p>

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

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Right-of-use
asset and operating lease liabilities are recognized based on the present value of future 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. The Company only has operating leases for office
facilities and warehouse space. 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.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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_905_eus-gaap--LesseeOperatingLeaseOptionToExtend_c20220501__20220731__srt--StatementGeographicalAxis__custom--MonroeTownshipMember_z56SaAqPZNh3" title="Lessee, operating lease, option to extend"> The
initial lease term is for <span id="xdx_903_eus-gaap--LesseeOperatingLeaseTermOfContract_iI_dc_c20220731__srt--StatementGeographicalAxis__custom--MonroeTownshipMember_zdFmyXRvxZ4h" title="Lessee, operating lease, term of contract">seven years</span> which is set to expire 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company also has a lease located in Houston, Texas that was acquired as part of the 3Dent acquisition that is used as office space.
The lease term is for <span id="xdx_907_eus-gaap--LesseeOperatingLeaseTermOfContract_iI_dtY_c20220731__us-gaap--BusinessAcquisitionAxis__custom--ThreeDentAcquisitionMember_zTREMG54V215" title="Lessee, operating lease, term of contract">3</span>
years and is set to <span id="xdx_902_eus-gaap--LesseeOperatingLeaseOptionToExtend_c20220501__20220731__us-gaap--BusinessAcquisitionAxis__custom--ThreeDentAcquisitionMember_zAMcsUwkpLXj" title="Lessee, operating lease, option to extend">expire
in January of 2023</span>. The lease is classified as an operating lease and included in the right-of-use assets and lease
liabilities- current on the Company&#8217;s Consolidated Balance Sheets.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company also has a lease with the University of California Berkeley in Richmond, California that was acquired as part of the MAR acquisition.
The lease expired on <span id="xdx_906_eus-gaap--LeaseExpirationDate1_dd_c20220501__20220731__us-gaap--BusinessAcquisitionAxis__custom--ThreeDentAcquisitionMember_z8QTzY16fAGf" title="Lease expiration date">June 30, 2022</span> and the Company is in discussions to renew this lease. As the lease expired prior to renewal, it has
become a month-to-month lease in accordance with the agreement. 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 not recognized as a right-of-use asset.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0; text-align: justify">The operating
lease cash flow payments for the three months ended July 31, 2022 and 2021 were $<span id="xdx_90E_eus-gaap--OperatingLeasePayments_c20220501__20220731_ztMWfpOR0Evd">100,000
</span>and $<span id="xdx_90B_eus-gaap--OperatingLeasePayments_c20210501__20210731_zf9vy5cV9hwg">102,000</span>, respectively.</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">&#160;</span></p>




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

<p id="xdx_89B_eus-gaap--LeaseCostTableTextBlock_zT71OthNK1j3" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
components of lease expense in the Consolidated Statement of Operations for the three months ended July 31, 2022 and 2021 were as follows:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_8BD_znWq8iTPtaB8" style="display: none">Schedule of Operating Lease Costs</span></span></p>

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  <tr style="display: none; vertical-align: bottom; background-color: White">
    <td style="text-align: left; padding-bottom: 1.5pt">&#160;</td><td style="padding-bottom: 1.5pt">&#160;</td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left">&#160;</td><td id="xdx_49C_20220501__20220731_zCcPtfLOLTn7" style="border-bottom: Black 1.5pt solid; text-align: right">&#160;</td><td style="padding-bottom: 1.5pt; text-align: left">&#160;</td><td style="padding-bottom: 1.5pt">&#160;</td>
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    <td colspan="6" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center">Three months ended July 31,</td><td style="padding-bottom: 1.5pt; font-weight: bold">&#160;</td></tr>
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    <td style="width: 60%; text-align: left">Operating lease cost</td><td style="width: 2%">&#160;</td>
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    <td style="text-align: left; padding-bottom: 2.5pt">Total lease cost</td><td style="padding-bottom: 2.5pt">&#160;</td>
    <td style="border-bottom: Black 2.5pt double; text-align: left">$</td><td style="border-bottom: Black 2.5pt double; text-align: right">100</td><td style="padding-bottom: 2.5pt; text-align: left">&#160;</td><td style="padding-bottom: 2.5pt">&#160;</td>
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<p id="xdx_8AC_zmizJSU8e0Db" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p id="xdx_89D_ecustom--ScheduleOfRightofUseAssetsAndLeaseLiabilitiesTableTextBlock_z1ouH9rNEz5i" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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 July 31, 2022 was as follows:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_8B7_zSm0ZGkHyu48" 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="display: none; vertical-align: bottom; background-color: White">
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    <td style="text-align: left">&#160;</td><td id="xdx_490_20220731_zb300GULtnU8" style="text-align: right">&#160;</td><td style="text-align: left">&#160;</td></tr>
<tr style="vertical-align: bottom">
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    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center">July 31, 2022</td><td style="padding-bottom: 1.5pt; font-weight: bold">&#160;</td></tr>
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    <td>&#160;</td><td>&#160;</td>
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    <td style="text-decoration: underline; text-align: left">Operating lease:</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>
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    <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>
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<p id="xdx_8AF_z5zPd2xeynj9" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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="Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
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<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/subtopic&amp;trid=77888251<br></p></div>
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<span style="display: none;">v3.22.2.2</span><table class="report" border="0" cellspacing="2" id="idm140132824586960">
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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">3 Months Ended</th>
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<td class="text"><p id="xdx_80D_eus-gaap--AccountsPayableAndAccruedLiabilitiesDisclosureTextBlock_zqB4L62067Nk" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(8)
<span id="xdx_823_zrv1PlAq6GTk">Accrued Expenses</span></b></span></p>

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

<p id="xdx_893_eus-gaap--ScheduleOfAccruedLiabilitiesTableTextBlock_zN7qwdIhZfdk" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Accrued
expenses consisted of the following at July 31, 2022 and April 30, 2022:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;<span id="xdx_8B2_zN41mf7hFlB" style="display: none">Schedule of Accrued Expenses</span></span></p>

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<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>The entire disclosure for accounts payable and accrued liabilities at the end of the reporting period.</p></div>
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<span style="display: none;">v3.22.2.2</span><table class="report" border="0" cellspacing="2" id="idm140132827159104">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Warrants<br></strong></div></th>
<th class="th" colspan="1">3 Months Ended</th>
</tr>
<tr><th class="th"><div>Jul. 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="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="Show.showAR( this, 'defref_OPTT_WarrantDisclosureTextBlock', window );">Warrants</a></td>
<td class="text"><p id="xdx_802_ecustom--WarrantDisclosureTextBlock_z2Q9PpYFa0b3" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(9)
<span id="xdx_82F_zTlbHCi1kbMf">Warrants</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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_90F_eus-gaap--SaleOfStockNumberOfSharesIssuedInTransaction_pid_c20190407__20190408_zl4XB9pV7eHe" 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_90B_eus-gaap--ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights_iI_pid_c20190408__us-gaap--StatementEquityComponentsAxis__custom--PreFundedWarrantsMember_z30hbdcIPzv" title="Purchase of warrants">3,385,680</span> shares
of common stock and common warrants to purchase up to <span id="xdx_908_eus-gaap--ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights_iI_pid_c20190408__us-gaap--StatementEquityComponentsAxis__custom--CommonWarrantsMember_z4m3hwjCUQQ8" title="Purchase of warrants">4,927,680</span> shares of 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_90D_eus-gaap--ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_iI_pid_c20190408__us-gaap--StatementEquityComponentsAxis__custom--PreFundedWarrantsMember_ztgidyQEIcS3">0.01</span> per share exercise
price of each warrant. The pre-funded warrants have no expiration date. As of July 31, 2022, all of the pre-funded warrants had been
exercised. The common stock warrants have an exercise price of $<span id="xdx_90D_eus-gaap--ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_iI_pid_c20190408__us-gaap--StatementEquityComponentsAxis__custom--CommonWarrantsMember_zUUNigMvMtph" title="Exercise price of warrants">3.85</span> per share and expire <span id="xdx_90F_eus-gaap--WarrantsAndRightsOutstandingTerm_iI_dc_c20190408__us-gaap--StatementEquityComponentsAxis__custom--CommonWarrantsMember_zPjOlQJRMGXk" title="Warrants and rights outstanding, term">five years</span> from the issuance date. As of July
31, 2022, warrants to purchase <span id="xdx_908_eus-gaap--ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights_iI_pid_c20220731__us-gaap--StatementEquityComponentsAxis__custom--CommonWarrantsMember_zJMeP3b8xGzf">732,500</span> shares of the common stock had been exercised.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company accounts for warrants 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 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-top: 0pt; margin-bottom: 0pt; margin-left: 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="Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="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="Show.toggleNext( this );">- Definition</a><div><p>Warrant Disclosure [Text Block]</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
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<span style="display: none;">v3.22.2.2</span><table class="report" border="0" cellspacing="2" id="idm140132826837264">
<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">3 Months Ended</th>
</tr>
<tr><th class="th"><div>Jul. 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="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="Show.showAR( this, 'defref_us-gaap_DebtDisclosureTextBlock', window );">Paycheck Protection Program Loan</a></td>
<td class="text"><p id="xdx_80D_eus-gaap--DebtDisclosureTextBlock_zVzxpQLxZ8Lk" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(10)
<span id="xdx_82C_zwYtnUH6cHQ">Paycheck Protection Program Loan</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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 $<span id="xdx_90A_eus-gaap--ProceedsFromLoanOriginations1_pp0p0_c20200501__20200503__us-gaap--TypeOfArrangementAxis__custom--PaycheckProtectionProgramMember_zzi6hZl16OZj" title="Proceeds from loan originations">891,000</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 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_903_ecustom--DebtForgivenessDescription_c20200501__20200503__us-gaap--TypeOfArrangementAxis__custom--PaycheckProtectionProgramMember_zEVvDWZWly45" title="Debt forgiveness, description">The
Company filed its loan forgiveness application at the end of February 2021 asking for <span id="xdx_909_eus-gaap--DebtInstrumentInterestRateStatedPercentage_iI_pid_dp_c20200503__us-gaap--TypeOfArrangementAxis__custom--PaycheckProtectionProgramMember_zhFkAJg8IETa" 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 has now been fully forgiven. The Company recognized a gain
on forgiveness of PPP loan of approximately $<span id="xdx_90F_eus-gaap--RepaymentsOfLongTermDebt_pp0p0_c20210501__20220430__us-gaap--TypeOfArrangementAxis__custom--PaycheckProtectionProgramMember_zb2ahVqIwqwf" title="Repayments of long-term debt">891,000</span> during the three months ended July 31, 2021.</span></span></p>

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

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

<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"/></p>




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

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

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

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<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="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="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="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 https://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 https://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 https://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 https://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 https://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 https://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 https://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 https://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 https://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 https://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 https://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 https://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 https://asc.fasb.org/extlink&amp;oid=123466505&amp;loc=SL123495323-112611<br></p></div>
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<span style="display: none;">v3.22.2.2</span><table class="report" border="0" cellspacing="2" id="idm140132827519664">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Share-Based Compensation<br></strong></div></th>
<th class="th" colspan="1">3 Months Ended</th>
</tr>
<tr><th class="th"><div>Jul. 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="Show.showAR( this, 'defref_us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock', window );">Share-Based Compensation</a></td>
<td class="text"><p id="xdx_806_eus-gaap--DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_z3jmsE3bZLC8" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(11)
<span id="xdx_828_zprnbRfTQhBi">Share-Based Compensation</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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_906_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_iI_c20151231__us-gaap--PlanNameAxis__custom--TwoThousandAndFifteenOmnibusIncentivePlanMember_zT4pZ1nj1znl" 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 July 31, 2022, the Company had <span id="xdx_906_eus-gaap--CommonStockCapitalSharesReservedForFutureIssuance_iI_c20220731__us-gaap--PlanNameAxis__custom--TwoThousandAndFifteenOmnibusIncentivePlanMember__srt--TitleOfIndividualAxis__srt--ChiefExecutiveOfficerMember_zKexwLUIALGh" title="Capital shares reserved for future issuance">695,127</span> shares available for future issuance under the
2015 Plan.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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_90B_eus-gaap--CommonStockCapitalSharesReservedForFutureIssuance_iI_c20180118__us-gaap--PlanNameAxis__custom--TwoThousandAndEighteenInducementPlanMember_zKNbJHhZO6gh" 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 employees of 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. On
February 9, 2022, the 2018 Inducement Plan was amended to increase the authorized shares by <span id="xdx_907_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_iI_pid_c20220208__us-gaap--PlanNameAxis__custom--TwoThousandAndEighteenInducementPlanMember_zhQpXUkUweo3" title="Share-based compensation arrangement shares authorized">250,000</span>
to <span id="xdx_90E_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_iI_pid_c20220209__us-gaap--PlanNameAxis__custom--TwoThousandAndEighteenInducementPlanMember_zXWXom2AxDO2" title="Share-based compensation arrangement shares authorized">275,000</span>.
As of July 31, 2022, there were <span id="xdx_90B_eus-gaap--CommonStockCapitalSharesReservedForFutureIssuance_iI_c20220731__us-gaap--PlanNameAxis__custom--TwoThousandAndEighteenInducementPlanMember_zY3BfNow1AL5" title="Capital shares reserved for future issuance">211,487</span>
shares available for grant under the 2018 Inducement Plan. The 2015 Plan and the 2018 Inducement Plan together comprise the &#8220;Stock Incentive Plans&#8221;.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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 commensurate with the expected life of the award. The expected
life (estimated period of time outstanding) of the stock options granted was 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 did not grant any stock options during the three
months ended July 31, 2022 and 2021.</span></p>

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

<p id="xdx_898_eus-gaap--ScheduleOfShareBasedCompensationActivityTableTextBlock_zXERJNdHJhBb" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;<span id="xdx_8B8_zazJOwN3zBXe" 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="vertical-align: bottom">
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  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
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  <tr style="vertical-align: bottom; background-color: White">
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Granted</span></td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td id="xdx_98D_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_pid_c20220501__20220731_z8XSpMDYH7a1" style="text-align: right" title="Shares underlying options outstanding, granted"><span style="-sec-ix-hidden: xdx2ixbrl0787">&#8212;</span></td><td style="text-align: left">&#160;</td><td>&#160;</td>
    <td style="text-align: left">$</td><td id="xdx_98A_eus-gaap--ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_pid_c20220501__20220731_z3vfmFZPhLpf" style="text-align: right" title="Weighted Average Exercise Price, Granted"><span style="-sec-ix-hidden: xdx2ixbrl0789">&#8212;</span></td><td style="text-align: left">&#160;</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td style="text-align: right">&#160;</td><td style="text-align: left">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Exercised</span></td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td id="xdx_982_eus-gaap--StockIssuedDuringPeriodSharesStockOptionsExercised_iN_pid_di_c20220501__20220731_z6nBa1ZZjQjk" style="text-align: right" title="Shares Underlying Options Outstanding, Exercised"><span style="-sec-ix-hidden: xdx2ixbrl0791">&#8212;</span></td><td style="text-align: left"/><td>&#160;</td>
    <td style="text-align: left">$</td><td id="xdx_98D_eus-gaap--ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_pid_c20220501__20220731_zQ5jD7AZKA45" style="text-align: right" title="Weighted Average Exercise Price, Exercised"><span style="-sec-ix-hidden: xdx2ixbrl0793">&#8212;</span></td><td style="text-align: left">&#160;</td><td>&#160;</td>
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  <tr style="vertical-align: bottom; background-color: White">
    <td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Cancelled/forfeited</span></td><td style="padding-bottom: 1.5pt">&#160;</td>
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    <td style="padding-bottom: 1.5pt; text-align: left">$</td><td id="xdx_98E_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice_pid_c20220501__20220731_z0MfMqqrCUr9" style="padding-bottom: 1.5pt; text-align: right" title="Weighted Average Exercise Price, Cancelled/forfeited">400.00</td><td style="padding-bottom: 1.5pt; text-align: left">&#160;</td><td style="padding-bottom: 1.5pt">&#160;</td>
    <td style="padding-bottom: 1.5pt; text-align: left">&#160;</td><td style="padding-bottom: 1.5pt; text-align: right">&#160;</td><td style="padding-bottom: 1.5pt; text-align: left">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Outstanding as of July 31, 2022</span></td><td style="padding-bottom: 2.5pt">&#160;</td>
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  <tr style="vertical-align: bottom; background-color: White">
    <td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Exercisable as of July 31, 2022</span></td><td style="padding-bottom: 2.5pt">&#160;</td>
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    <td style="padding-bottom: 2.5pt; text-align: left">$</td><td id="xdx_98F_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_iI_pid_c20220731_zj9vLRHLH7hf" style="padding-bottom: 2.5pt; text-align: right" title="Weighted average exercise price, exercisable at ending">4.60</td><td style="padding-bottom: 2.5pt; text-align: left">&#160;</td><td style="padding-bottom: 2.5pt">&#160;</td>
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  </table>

<p id="xdx_8AA_zWsymkxdRJo" 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">&#160;</span></p>




<p style="font: 10pt Times New Roman, Times, Serif; text-align: center; 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">As
of July 31, 2022, the total intrinsic value of outstanding and exercisable options was approximately <span id="xdx_90E_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_iI_pp0p0_do_c20220731__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zPo2NvFQPHz9" title="Intrinsic value of outstanding and exercisable options">zero</span>. As of July 31, 2022, approximately
<span id="xdx_905_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares_iI_pid_c20220731__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zsK2op8nLJ8c" title="Options unvested">813,000</span> options were unvested, which had an intrinsic value of <span id="xdx_90E_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_iI_pp0p0_do_c20220731__us-gaap--AwardTypeAxis__custom--EmployeeStockOptionOneMember_zB90Xy4P6Yad" 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_90B_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1_dtY_c20220501__20220731__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zfM3oBOF4i2d" title="Weighted average remaining contractual term">9.4</span> years. There
was approximately $<span id="xdx_90A_eus-gaap--AllocatedShareBasedCompensationExpense_c20220501__20220731__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zkvfaGzdEjl4" title="Share-based payment arrangement, expense">96,000 </span>and $<span id="xdx_90A_eus-gaap--AllocatedShareBasedCompensationExpense_c20210501__20210731__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zXoztFpY7L4" title="Share-based payment arrangement, expense">110,000</span> of total recognized compensation cost related to stock options during each of the three months
ended July 31, 2022 and 2021, respectively. As of July 31, 2022, there was approximately $<span id="xdx_902_eus-gaap--EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions_iI_pn5n6_c20220731__us-gaap--AwardTypeAxis__custom--NonVestedStockMember_z7WSfTJNGdN8" title="Unrecognized compensation cost related to non-vested stock">0.7</span> million 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_901_eus-gaap--EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_dtY_c20220501__20220731__us-gaap--AwardTypeAxis__custom--NonVestedStockMember_zGjfvs2WUGSd" title="Share-based compensation of weighted-average period">2.3</span> years.</span></p>

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

<p id="xdx_89D_eus-gaap--ScheduleOfShareBasedCompensationActivityTableTextBlock_hus-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zX3QvoeujmSl" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">A
summary of performance 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_8BB_zBu4oBuwBouc" 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="vertical-align: bottom">
    <td style="text-align: left">&#160;</td><td style="padding-bottom: 1.5pt">&#160;</td>
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  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="width: 46%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Outstanding as of April 30, 2022</span></td><td style="width: 2%">&#160;</td>
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  <tr style="vertical-align: bottom; background-color: White">
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Granted</span></td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td id="xdx_987_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_pid_c20220501__20220731__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_z6q0StxPMAj7" style="text-align: right" title="Shares underlying options outstanding, granted"><span style="-sec-ix-hidden: xdx2ixbrl0835">&#8212;</span></td><td style="text-align: left">&#160;</td><td>&#160;</td>
    <td style="text-align: left">$</td><td id="xdx_98B_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_pid_c20220501__20220731__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_z4BHaOnXmyfl" style="text-align: right" title="Shares underlying options outstanding, granted"><span style="-sec-ix-hidden: xdx2ixbrl0837">&#8212;</span></td><td style="text-align: left">&#160;</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td style="text-align: right">&#160;</td><td style="text-align: left">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Exercised</span></td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td id="xdx_985_eus-gaap--StockIssuedDuringPeriodSharesStockOptionsExercised_iN_pid_di_c20220501__20220731__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zR5mwSojMHc7" style="text-align: right" title="Shares Underlying Options Outstanding, Exercised"><span style="-sec-ix-hidden: xdx2ixbrl0839">&#8212;</span></td><td style="text-align: left">&#160;</td><td>&#160;</td>
    <td style="text-align: left">$</td><td id="xdx_984_eus-gaap--ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_pid_c20220501__20220731__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zGhE28bOSKil" style="text-align: right" title="Weighted Average Exercise Price, Exercised"><span style="-sec-ix-hidden: xdx2ixbrl0841">&#8212;</span></td><td style="text-align: left">&#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: White">
    <td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Cancelled/forfeited</span></td><td style="padding-bottom: 1.5pt">&#160;</td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left">&#160;</td><td id="xdx_987_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod_iN_pid_di_c20220501__20220731__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zSO09qRx9BE4" style="border-bottom: Black 1.5pt solid; text-align: right" title="Shares Underlying Options Outstanding, Cancelled/forfeited"><span style="-sec-ix-hidden: xdx2ixbrl0843">&#8212;</span></td><td style="padding-bottom: 1.5pt; text-align: left">&#160;</td><td style="padding-bottom: 1.5pt">&#160;</td>
    <td style="padding-bottom: 1.5pt; text-align: left">$</td><td id="xdx_98A_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice_pid_c20220501__20220731__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_z3n7cI6hkUki" style="padding-bottom: 1.5pt; text-align: right" title="Weighted Average Exercise Price, Cancelled/forfeited"><span style="-sec-ix-hidden: xdx2ixbrl0845">&#8212;</span></td><td style="padding-bottom: 1.5pt; text-align: left">&#160;</td><td style="padding-bottom: 1.5pt">&#160;</td>
    <td style="padding-bottom: 1.5pt; text-align: left">&#160;</td><td style="padding-bottom: 1.5pt; text-align: right">&#160;</td><td style="padding-bottom: 1.5pt; text-align: left">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Outstanding as of July 31, 2022</span></td><td style="padding-bottom: 2.5pt">&#160;</td>
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    <td style="padding-bottom: 2.5pt; text-align: left">$</td><td id="xdx_982_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_iE_pid_c20220501__20220731__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zoOYJSmdK3vh" style="padding-bottom: 2.5pt; text-align: right" title="Weighted average exercise price, ending balance">2.20</td><td style="padding-bottom: 2.5pt; text-align: left">&#160;</td><td style="padding-bottom: 2.5pt">&#160;</td>
    <td style="padding-bottom: 2.5pt; text-align: left">&#160;</td><td style="padding-bottom: 2.5pt; text-align: right"><span id="xdx_90C_ecustom--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm_dtY_c20220501__20220731__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zblURCj3N4Ff" title="Weighted Average Remaining Contractual Term (In Years), Ending">8.6</span></td><td style="padding-bottom: 2.5pt; text-align: left">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Exercisable as of July 31, 2022</span></td><td style="padding-bottom: 2.5pt">&#160;</td>
    <td style="border-bottom: Black 2.5pt double; text-align: left">&#160;</td><td id="xdx_982_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_iI_pid_c20220731__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zD7QwVOzyGjh" style="border-bottom: Black 2.5pt double; text-align: right" title="Shares Underlying Options Outstanding, Exercisable at Ending"><span style="-sec-ix-hidden: xdx2ixbrl0853">&#8212;</span></td><td style="padding-bottom: 2.5pt; text-align: left">&#160;</td><td style="padding-bottom: 2.5pt">&#160;</td>
    <td style="padding-bottom: 2.5pt; text-align: left">$</td><td id="xdx_986_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_iI_pid_c20220731__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zvJWpECxI9Ik" style="padding-bottom: 2.5pt; text-align: right" title="Weighted average exercise price, exercisable at ending"><span style="-sec-ix-hidden: xdx2ixbrl0855">&#8212;</span></td><td style="padding-bottom: 2.5pt; text-align: left">&#160;</td><td style="padding-bottom: 2.5pt">&#160;</td>
    <td style="padding-bottom: 2.5pt; text-align: left">&#160;</td><td style="padding-bottom: 2.5pt; text-align: right">&#160;</td><td style="padding-bottom: 2.5pt; text-align: left">&#160;</td></tr>
  </table>

<p id="xdx_8A1_zh837vUntyq" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0; text-align: justify">As of July
31, 2022, approximately <span id="xdx_90D_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares_iI_pid_c20220731__us-gaap--AwardTypeAxis__us-gaap--PerformanceSharesMember_zli5jn4Hl6n5" title="Options, number of shares unvested">210,000</span>
options were unvested, which had an intrinsic value of <span id="xdx_90B_ecustom--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsUnvestedOutstandingIntrinsicValue_iI_dc_c20220731__us-gaap--AwardTypeAxis__us-gaap--PerformanceSharesMember_zxqI2FiKrccb" title="Options, outstanding, intrinsic value">zero</span>
and
a weighted average remaining contractual term of <span id="xdx_901_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1_dtY_c20220501__20220731__us-gaap--AwardTypeAxis__us-gaap--PerformanceSharesMember_zK8j58puyq1l" title="Weighted average remaining contractual term">8.6</span>
years.
There was approximately $<span id="xdx_90B_eus-gaap--AllocatedShareBasedCompensationExpense_c20220501__20220731__us-gaap--AwardTypeAxis__us-gaap--PerformanceSharesMember_zdR34MdaB2v4" title="Recognized compensation cost">52,500</span>
and
$<span id="xdx_908_eus-gaap--AllocatedShareBasedCompensationExpense_c20210501__20210731__us-gaap--AwardTypeAxis__us-gaap--PerformanceSharesMember_zdPh7IaAz939" title="Recognized compensation cost">95,000</span>
of
total recognized compensation cost related to stock options during the three months ended July 31, 2022 and 2021, respectively. As of
July 31, 2022, there was approximately $<span id="xdx_90C_eus-gaap--EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions_iI_pn5n6_c20220731__us-gaap--AwardTypeAxis__us-gaap--PerformanceSharesMember_zjAqys2MPlCk" title="Unrecognized compensation cost">0.1
</span>million
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_90C_eus-gaap--EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_dtY_c20220501__20220731__us-gaap--AwardTypeAxis__us-gaap--PerformanceSharesMember_z5ddSpHVPaw3" title="Share-based compensation of weighted-average period">0.6
</span>years.</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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 three months ended July 31, 2022 and 2021, the Company granted <span><span id="xdx_90E_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_c20220501__20220731_z8nbloO5eat7" title="Number of restricted shares, granted">51,500</span> and <span><span id="xdx_90C_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_dc_c20210501__20210731_zHxhwHgqkMR6" title="Number of restricted shares, granted">zero</span></span></span> shares, respectively that
were subject to service-based vesting requirements.</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">&#160;</span></p>




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

<p id="xdx_894_eus-gaap--ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityTableTextBlock_zXhzV3QLufq" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_8BA_zfnAiHlVJ1N8" 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="vertical-align: bottom">
    <td>&#160;</td><td style="padding-bottom: 1.5pt">&#160;</td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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="padding-bottom: 1.5pt">&#160;</td><td style="padding-bottom: 1.5pt">&#160;</td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Average
Price <br/>
per</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Share</b></span></p></td><td style="padding-bottom: 1.5pt">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="width: 60%; text-align: left">Unvested at April 30, 2022</td><td style="width: 2%">&#160;</td>
    <td style="width: 1%; text-align: left">&#160;</td><td id="xdx_988_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_iS_pid_c20220501__20220731__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_z8F9ER2s8fV" style="width: 16%; text-align: right" title="Number of Shares, Unvested, Beginning">827,764</td><td style="width: 1%; text-align: left">&#160;</td><td style="width: 2%">&#160;</td>
    <td style="width: 1%; text-align: left">$</td><td id="xdx_981_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_iS_pid_c20220501__20220731__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_zeS3otUL2eO6" style="width: 16%; text-align: right" title="Weighted Average Price per Share, Unvested, Beginning">1.41</td><td style="width: 1%; text-align: left">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td>Granted</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td id="xdx_983_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_pid_c20220501__20220731__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_zXrQarTRni9" style="text-align: right" title="Number of Shares, Unvested, Granted">51,500</td><td style="text-align: left">&#160;</td><td>&#160;</td>
    <td style="text-align: left">$</td><td id="xdx_984_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_pid_c20220501__20220731__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_zwKiFmztzVO3" style="text-align: right" title="Weighted Average Price per Share, Unvested, Granted">1.12</td><td style="text-align: left">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td>Vested and issued</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td id="xdx_987_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_iN_pid_di_c20220501__20220731__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_zF1erS6FPacd" style="text-align: right" title="Number of Shares, Unvested, Vested and issued">(16,667</td><td style="text-align: left">)</td><td>&#160;</td>
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    <td style="padding-bottom: 1.5pt; text-align: left">&#160;</td><td style="padding-bottom: 1.5pt; text-align: right">&#160;</td><td style="padding-bottom: 1.5pt; text-align: left">&#160;</td></tr>
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    <td style="text-align: left; padding-bottom: 2.5pt">Unvested at July 31, 2022</td><td style="padding-bottom: 2.5pt">&#160;</td>
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    <td style="padding-bottom: 2.5pt; text-align: left">$</td><td id="xdx_98D_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_iE_pid_c20220501__20220731__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_zgHvsBu9eRO5" style="padding-bottom: 2.5pt; text-align: right" title="Weighted Average Price per Share, Unvested, Ending">1.38</td><td style="padding-bottom: 2.5pt; text-align: left">&#160;</td></tr>
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<p id="xdx_8A6_z9yoWlUSdoc1" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">There
was approximately $<span id="xdx_90C_eus-gaap--AllocatedShareBasedCompensationExpense_pp0p0_c20220501__20220731__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_z7Z7rmvjodid" title="Share-based payment arrangement, expense">184,000</span> and $<span id="xdx_907_eus-gaap--AllocatedShareBasedCompensationExpense_pp0p0_c20210501__20210731__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_zgFk8NwjLQzh">14,000</span> of total recognized compensation cost related to restricted stock for the three months ended July
31, 2022 and 2021, respectively. As of July 31, 2022, there is approximately $<span id="xdx_90C_eus-gaap--EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_iI_c20220731__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_z8hzhqqf6Bu6" title="Unrecognized compensation cost">821,067</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 <span id="xdx_90E_eus-gaap--EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_dtY_c20220501__20220731__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_zX3KEAttj48l" title="Share-based compensation of weighted-average period">1.8</span> years.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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;">v3.22.2.2</span><table class="report" border="0" cellspacing="2" id="idm140132827365520">
<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">3 Months Ended</th>
</tr>
<tr><th class="th"><div>Jul. 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="Show.showAR( this, 'defref_us-gaap_FairValueDisclosuresAbstract', window );"><strong>Fair Value Disclosures [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="Show.showAR( this, 'defref_us-gaap_FairValueDisclosuresTextBlock', window );">Fair Value Measurements</a></td>
<td class="text"><p id="xdx_807_eus-gaap--FairValueDisclosuresTextBlock_zc7BCZRdtE86" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(12)
<span id="xdx_82A_z0FbtkvJMJW4">Fair Value Measurements</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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; width: 0.6in"><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"><span style="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>
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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">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>
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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; text-align: justify"><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: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Inputs
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<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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: 0; text-align: justify">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 Company&#8217;s contingent consideration liability represent the only asset or liability classified
financial instrument that is measured at fair value on a recurring basis.</p>
<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
total carrying value of our marketable securities approximates fair value due to the short term nature of these investments. As of
July 31, 2022 and April 30, 2022, the carrying values were $<span id="xdx_909_eus-gaap--InvestmentsFairValueDisclosure_iI_pn5n6_c20220731_zdQsP3Zc3h9l" title="Fair value of investments">42.7</span>
million and $<span id="xdx_90F_eus-gaap--InvestmentsFairValueDisclosure_iI_pn5n6_c20220430_zJwlsS6u58G2" title="Fair value of investments">49.4</span>
million, respectively.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Additionally,
there is a Level 3 contingent liability related to earnouts as part of the MAR acquisition in the amount of $<span id="xdx_90C_eus-gaap--BusinessCombinationContingentConsiderationLiability_iI_pn5n6_c20220731__us-gaap--FairValueByFairValueHierarchyLevelAxis__us-gaap--FairValueInputsLevel3Member_zKPBnFnp68A6" title="Contingent liability MAR acquisition amount">1.5</span> million as the inputs
are currently unobservable to determine this fair value. As of July 31, 2022, the fair value of this contingent liability from
the time that it was acquired has decreased by $<span id="xdx_90B_ecustom--IncreaseDecreaseInContingentLiability_pn5n6_c20220501__20220731__us-gaap--FairValueByFairValueHierarchyLevelAxis__us-gaap--FairValueInputsLevel3Member_zSMQzgVw7xV6" title="Decrease in contingent liability">0.1</span> million from $<span id="xdx_907_eus-gaap--ContingentConsiderationClassifiedAsEquityFairValueDisclosure_iI_pn5n6_c20220731__us-gaap--FairValueByFairValueHierarchyLevelAxis__us-gaap--FairValueInputsLevel3Member_z49tClFdyBWe" title="Fair value of contingent consideration">1.6</span> million.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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 months ended July 31, 2022 and 2021.</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">&#160;</span></p>




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

<span></span>
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<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
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<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=126976982&amp;loc=d3e19207-110258<br></p></div>
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<span style="display: none;">v3.22.2.2</span><table class="report" border="0" cellspacing="2" id="idm140132825799776">
<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">3 Months Ended</th>
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<tr><th class="th"><div>Jul. 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="Show.showAR( this, 'defref_us-gaap_CommitmentsAndContingenciesDisclosureAbstract', window );"><strong>Commitments and Contingencies Disclosure [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="Show.showAR( this, 'defref_us-gaap_CommitmentsAndContingenciesDisclosureTextBlock', window );">Commitments and Contingencies</a></td>
<td class="text"><p id="xdx_804_eus-gaap--CommitmentsAndContingenciesDisclosureTextBlock_zJHR4dFHGwg5" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(13)
<span id="xdx_827_zy6bjfeyxt6f">Commitments and Contingencies</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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 its 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 year ended April 30, 2022,
the Company received notice from the Spanish Central Economic and Administrative Tribunal (&#8220;Spanish Tax Administration&#8221;)
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_903_eus-gaap--IncomeTaxExaminationPenaltiesAndInterestAccrued_iI_pp0p0_uEuro_c20210125__us-gaap--IncomeStatementLocationAxis__us-gaap--SellingGeneralAndAdministrativeExpensesMember__us-gaap--IncomeTaxAuthorityNameAxis__us-gaap--TaxAuthoritySpainMember_zBPaAqeNM2f8" title="Income tax penalties">279,870</span> or approximately
$<span id="xdx_90B_eus-gaap--IncomeTaxExaminationPenaltiesAndInterestAccrued_iI_pp0p0_c20220731__us-gaap--IncomeStatementLocationAxis__us-gaap--SellingGeneralAndAdministrativeExpensesMember__us-gaap--IncomeTaxAuthorityNameAxis__us-gaap--TaxAuthoritySpainMember_zzsBD0GV26o2" title="Income tax penalties">331,000</span>. On January 25, 2021, the Company paid the Spanish Tax Administration &#8364;<span id="xdx_90F_eus-gaap--LossContingencyDamagesPaidValue_pp0p0_uEuro_c20210124__20210125__us-gaap--IncomeTaxAuthorityNameAxis__us-gaap--TaxAuthoritySpainMember_zKtrUPGqHvv7" title="Payment of tax on damages">279,870</span>. Notwithstanding that payment, on April
30, 2022, the Company filed its appeal of the decision of the Central Court to the Spanish National Court. The Company expects a ruling
on the appeal prior to the end of fiscal 2023.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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="Show.toggleNext( this );">- Definition</a><div><p>The entire disclosure for commitments and contingencies.</p></div>
<a href="javascript:void(0);" onclick="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 440<br> -URI https://asc.fasb.org/topic&amp;trid=2144648<br><br>Reference 2: 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 https://asc.fasb.org/extlink&amp;oid=6491277&amp;loc=d3e6429-115629<br><br>Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 450<br> -URI https://asc.fasb.org/topic&amp;trid=2127136<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 https://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 https://asc.fasb.org/extlink&amp;oid=123406679&amp;loc=d3e25336-109308<br></p></div>
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<span style="display: none;">v3.22.2.2</span><table class="report" border="0" cellspacing="2" id="idm140132826803424">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Income Taxes<br></strong></div></th>
<th class="th" colspan="1">3 Months Ended</th>
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<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_IncomeTaxDisclosureTextBlock', window );">Income Taxes</a></td>
<td class="text"><p id="xdx_80B_eus-gaap--IncomeTaxDisclosureTextBlock_zyqBPy7S5dYd" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(14)
<span id="xdx_82B_zlYmv30CE0z2">Income Taxes</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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. The Company is currently undergoing an income tax audit
in Spain for the period from 2011 to 2014, when the Company&#8217;s Spanish branch was closed. At July 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. 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company does not have any interest or penalties accrued related to uncertain tax positions as it does not have any unrecognized tax benefits.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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 New Jersey Economic Development Authority
Tax Transfer program in the amount of approximately $<span id="xdx_902_eus-gaap--OperatingLossCarryforwards_iI_pn5n6_c20210430__us-gaap--IncomeTaxAuthorityNameAxis__us-gaap--NewJerseyDivisionOfTaxationMember_zoBipJCGVqb8" title="Operating loss">12.0</span> million for the year ended April 30, 2021, for net proceeds of approximately
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<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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="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="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 https://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 https://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 https://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 https://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 https://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 https://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 https://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 https://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 https://asc.fasb.org/extlink&amp;oid=120395691&amp;loc=d3e23780-122690<br></p></div>
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<span style="display: none;">v3.22.2.2</span><table class="report" border="0" cellspacing="2" id="idm140132827365520">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Operating Segments and Geographic Information<br></strong></div></th>
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<td class="text"><p id="xdx_803_eus-gaap--SegmentReportingDisclosureTextBlock_zlrryHlsMkM4" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(15)
<span id="xdx_82C_ze4EJ4aU5QB4">Operating Segments and Geographic Information</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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_90C_eus-gaap--NumberOfOperatingSegments_pid_dc_uSegment_c20220501__20220731_zosv5LDhP2A4" title="Number of operating segments">one</span>
reportable segment as the revenues associated with its different business lines are not material enough to justify segment reporting
or to make it meaningful to investors, and our chief operating decision maker does not view the Company&#8217;s operations on a
segment basis. The Company operates on a worldwide basis with one operating company in the U.S. and one operating subsidiary in the
UK and one operating subsidiary which was discontinued during 2022 in Australia. Revenues and expenses are generally attributed to
the operating unit that bills the customers. During each of the three months ended July 31, 2022 and 2021, the Company&#8217;s
primary business operations were in North America.</span></p>

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<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
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<a href="javascript:void(0);" onclick="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;">v3.22.2.2</span><table class="report" border="0" cellspacing="2" id="idm140132821877920">
<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">3 Months Ended</th>
</tr>
<tr><th class="th"><div>Jul. 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="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="Show.showAR( this, 'defref_us-gaap_ConsolidationPolicyTextBlock', window );">Consolidation</a></td>
<td class="text"><p id="xdx_84D_eus-gaap--ConsolidationPolicyTextBlock_zy0U9TtxwgZ6" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>(a)
<span id="xdx_862_zOOXfzGk1VWc">Consolidation</span></i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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, Ocean Power Technologies
Ltd. in the United Kingdom, and Ocean Power Technologies (Australasia) Pty Ltd. in Australia (&#8220;OPT-A&#8221;). OPT-A is in the process
of being liquidated. All documents have been filed with the Australian Tax Organization and the Company expects this to be completed
in the second quarter of the current fiscal year. All significant intercompany accounts and transactions have been eliminated in consolidation.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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="Show.showAR( this, 'defref_us-gaap_UseOfEstimates', window );">Use of Estimates</a></td>
<td class="text"><p id="xdx_844_eus-gaap--UseOfEstimates_zg0FcSINI2wa" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>(b)
<span id="xdx_86E_zliy00geaJul">Use of Estimates</span></i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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, stock-based
compensation, 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 hours and costs
to complete projects 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-top: 0pt; margin-bottom: 0pt; margin-left: 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="Show.showAR( this, 'defref_us-gaap_CashAndCashEquivalentsRestrictedCashAndCashEquivalentsPolicy', window );">Cash, Cash Equivalents, Restricted, Security Agreements and Marketable Securities</a></td>
<td class="text"><p id="xdx_84E_eus-gaap--CashAndCashEquivalentsRestrictedCashAndCashEquivalentsPolicy_zaxnFNkuk5ba" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>(c)
<span id="xdx_86C_zoAE1d1Nc6Wf">Cash, Cash Equivalents, Restricted, Security Agreements and Marketable Securities</span></i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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 or in marketable securities. The following table summarizes cash and cash equivalents
as of July 31, 2022 and April 30, 2022:</span></p>

<p id="xdx_899_eus-gaap--ScheduleOfCashAndCashEquivalentsTableTextBlock_z2mEzmhIBMT7" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_8B4_zeno9R6Dqtwd" style="display: none">Schedule of Cash and Cash Equivalents</span></span></p>

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    <td>&#160;</td><td>&#160;</td>
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    <td style="width: 60%; text-align: left">Checking and savings accounts</td><td style="width: 2%">&#160;</td>
    <td style="width: 1%; text-align: left">$</td><td id="xdx_98A_eus-gaap--CashAndCashEquivalentsAtCarryingValue_iI_pn3n3_c20220731__us-gaap--CashAndCashEquivalentsAxis__custom--CheckingAndSavingsAccountsMember_zgvAdKuStM47" style="width: 16%; text-align: right" title="Cash and cash equivalents">2,029</td><td style="width: 1%; text-align: left">&#160;</td><td style="width: 2%">&#160;</td>
    <td style="width: 1%; text-align: left">$</td><td id="xdx_98A_eus-gaap--CashAndCashEquivalentsAtCarryingValue_iI_pn3n3_c20220430__us-gaap--CashAndCashEquivalentsAxis__custom--CheckingAndSavingsAccountsMember_zhIqmUCtNui9" style="width: 16%; text-align: right" title="Cash and cash equivalents">1,815</td><td style="width: 1%; text-align: left">&#160;</td></tr>
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    <td style="border-bottom: Black 1.5pt solid; text-align: left">&#160;</td><td id="xdx_982_eus-gaap--CashAndCashEquivalentsAtCarryingValue_iI_pn3n3_c20220731__us-gaap--CashAndCashEquivalentsAxis__us-gaap--MoneyMarketFundsMember_zxC9aaEj0T74" style="border-bottom: Black 1.5pt solid; text-align: right" title="Cash and cash equivalents">7,147</td><td style="padding-bottom: 1.5pt; text-align: left">&#160;</td><td style="padding-bottom: 1.5pt">&#160;</td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left">&#160;</td><td id="xdx_980_eus-gaap--CashAndCashEquivalentsAtCarryingValue_iI_pn3n3_c20220430__us-gaap--CashAndCashEquivalentsAxis__us-gaap--MoneyMarketFundsMember_zfhRJOMZL0Kf" style="border-bottom: Black 1.5pt solid; text-align: right" title="Cash and cash equivalents">6,070</td><td style="padding-bottom: 1.5pt; text-align: left">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="padding-bottom: 2.5pt">&#160;</td><td style="padding-bottom: 2.5pt">&#160;</td>
    <td style="border-bottom: Black 2.5pt double; text-align: left">$</td><td id="xdx_985_eus-gaap--CashAndCashEquivalentsAtCarryingValue_iI_pn3n3_c20220731_zk7z4N27ervh" style="border-bottom: Black 2.5pt double; text-align: right" title="Cash and cash equivalents">9,176</td><td style="padding-bottom: 2.5pt; text-align: left">&#160;</td><td style="padding-bottom: 2.5pt">&#160;</td>
    <td style="border-bottom: Black 2.5pt double; text-align: left">$</td><td id="xdx_98E_eus-gaap--CashAndCashEquivalentsAtCarryingValue_iI_pn3n3_c20220430_zlkkwhY2mE2i" style="border-bottom: Black 2.5pt double; text-align: right" title="Cash and cash equivalents">7,885</td><td style="padding-bottom: 2.5pt; text-align: left">&#160;</td></tr>
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<p id="xdx_8AE_zpOVZJDTs09h" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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_906_eus-gaap--Deposits_iI_c20220731__us-gaap--TypeOfArrangementAxis__custom--RestrictedCashAndSecurityAgreementsMember__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--SantanderBankMember__us-gaap--ShortTermDebtTypeAxis__us-gaap--LetterOfCreditMember_zmjus2Yp2fMc" title="Deposits">154,000</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 the bank.</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">&#160;</span></p>




<p style="font: 10pt Times New Roman, Times, Serif; text-align: center; 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Santander
also issued a letter of credit to subsidiaries of Enel Green Power (&#8220;EGP&#8221;) pursuant to the Company&#8217;s contracts with
EGP. This letter of credit was originally issued in the amount of $<span id="xdx_904_eus-gaap--LettersOfCreditOutstandingAmount_iI_c20200831__us-gaap--TypeOfArrangementAxis__custom--RestrictedCashAndSecurityAgreementsMember__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--SantanderBankMember__us-gaap--ShortTermDebtTypeAxis__custom--LetterOneMember_zITRrjl16il7" title="Letters of credit outstanding, Amount">645,000</span> and was reduced to $<span id="xdx_908_eus-gaap--LettersOfCreditOutstandingAmount_iI_pp0p0_c20200831__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--SantanderBankMember__us-gaap--ShortTermDebtTypeAxis__custom--LetterTwoMember__us-gaap--AwardDateAxis__custom--AugustTwentyTwentyMember_zPryBf3RlNqg">323,000</span> in August 2020. The letter of
credit will be reduced by an additional $<span id="xdx_909_ecustom--LettersOfCreditIssuedAmount_iI_pp0p0_c20220731__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--SantanderBankMember__us-gaap--ShortTermDebtTypeAxis__custom--LetterTwoMember_zfWIdANCv4H7">258,000</span> once the PowerBuoy&#174; (&#8220;PB3&#8221;) and its accompanying systems pass final
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<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;</span></p>

<p id="xdx_894_eus-gaap--ScheduleOfRestrictedCashAndCashEquivalentsTextBlock_zK4GorEL60m1" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_8BD_zxublpbXDUyi" 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="display: none; vertical-align: bottom; background-color: White">
    <td style="text-align: left">&#160;</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td id="xdx_493_20220731_zh4GFdLidXm8" style="text-align: right">&#160;</td><td style="text-align: left">&#160;</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td id="xdx_496_20220430" style="text-align: right">&#160;</td><td style="text-align: left">&#160;</td></tr>
<tr style="vertical-align: bottom">
    <td>&#160;</td><td style="font-weight: bold; padding-bottom: 1.5pt">&#160;</td>
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  <tr style="vertical-align: bottom">
    <td>&#160;</td><td>&#160;</td>
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    <td style="width: 60%; text-align: left">Cash and cash equivalents</td><td style="width: 2%">&#160;</td>
    <td style="width: 1%; text-align: left">$</td><td style="width: 16%; text-align: right">9,176</td><td style="width: 1%; text-align: left">&#160;</td><td style="width: 2%">&#160;</td>
    <td style="width: 1%; text-align: left">$</td><td style="width: 16%; text-align: right">7,885</td><td style="width: 1%; text-align: left">&#160;</td></tr>
  <tr id="xdx_401_eus-gaap--RestrictedCashCurrent_iI_pn3n3" style="vertical-align: bottom; background-color: White">
    <td style="text-align: left">Restricted cash- short term</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td style="text-align: right">258</td><td style="text-align: left">&#160;</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td style="text-align: right">258</td><td style="text-align: left">&#160;</td></tr>
  <tr id="xdx_40F_eus-gaap--RestrictedCashNoncurrent_iI_pn3n3" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left; padding-bottom: 1.5pt">Restricted cash- long term</td><td style="padding-bottom: 1.5pt">&#160;</td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left">&#160;</td><td style="border-bottom: Black 1.5pt solid; text-align: right">219</td><td style="padding-bottom: 1.5pt; text-align: left">&#160;</td><td style="padding-bottom: 1.5pt">&#160;</td>
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  <tr id="xdx_40B_eus-gaap--CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_iI_pn3n3_zPoAY8k6bTKg" style="vertical-align: bottom; background-color: White">
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    restricted cash and restricted cash equivalents</span></td><td style="padding-bottom: 2.5pt">&#160;</td>
    <td style="border-bottom: Black 2.5pt double; text-align: left">$</td><td style="border-bottom: Black 2.5pt double; text-align: right">9,653</td><td style="padding-bottom: 2.5pt; text-align: left">&#160;</td><td style="padding-bottom: 2.5pt">&#160;</td>
    <td style="border-bottom: Black 2.5pt double; text-align: left">$</td><td style="border-bottom: Black 2.5pt double; text-align: right">8,362</td><td style="padding-bottom: 2.5pt; text-align: left">&#160;</td></tr>
  </table>

<p id="xdx_8AF_zb501wK86kH2" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><i>Marketable
Securities</i></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">During
fiscal 2022, the Company acquired investment securities through Charles Schwab Bank. As of July 31, 2022 and April 30, 2022, their
value was approximately $<span id="xdx_90B_eus-gaap--AlternativeInvestment_iI_pn5n6_c20220731_zK7gerDVwuha" title="Investment securities">42.7</span>
million and $<span id="xdx_901_eus-gaap--AlternativeInvestment_iI_pn5n6_c20220430_zvnTCS0Curmf">49.4</span> million, respectively.
All marketable securities consist of corporate bonds, government agency bonds, or U.S. Treasury Notes and Bonds, are investment
grade rated or better, and mature within 12 months. The Company has the means and intends to hold all investments to maturity, and
as such are classified as held-to-maturity investments and carried at amortized cost. The total recognized interest expense on the
premium we paid for the securities as of July 31, 2022 and 2021 is approximately <span>$<span id="xdx_903_eus-gaap--InvestmentIncomeNetAmortizationOfDiscountAndPremium_pn5n6_c20220501__20220731_z8CzZCnSUQcd" title="Discount and premium">0.1</span>
million and <span id="xdx_908_eus-gaap--InvestmentIncomeNetAmortizationOfDiscountAndPremium_dc_c20210501__20210731_zdPYMZcgV65l">zero</span></span>,
respectively, on an amortized cost basis of approximately $<span id="xdx_907_eus-gaap--TradingSecuritiesDebtAmortizedCost_iI_pn5n6_c20220731_zPQbCWbzjE0i" title="Investment owned at cost">0.3</span>
million and <span id="xdx_90E_eus-gaap--TradingSecuritiesDebtAmortizedCost_iI_dc_c20210731_zkobbCmIcW3">zero</span>, respectively.
Additionally, there has been no impairment on these investments.</span></p>

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

<p id="xdx_89C_eus-gaap--UnrealizedGainLossOnInvestmentsTableTextBlock_zy0USolL0Yg8" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
following table summarizes the Company&#8217;s marketable securities as of July 31, 2022:</span></p>

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

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_8B5_z9L3fZ3W0lYc" style="display: none">Schedule of Investments and Unrealized Gains/Losses</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="border-bottom: Black 1.5pt solid; font-weight: bold">Category (in thousands)</td><td style="padding-bottom: 1.5pt; font-weight: bold">&#160;</td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center">Market Value</td><td style="padding-bottom: 1.5pt; font-weight: bold">&#160;</td><td style="padding-bottom: 1.5pt; font-weight: bold">&#160;</td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center">Unrealized <br/>
Gains (Losses)</td><td style="padding-bottom: 1.5pt; font-weight: bold">&#160;</td><td style="padding-bottom: 1.5pt; font-weight: bold">&#160;</td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center">Adjusted Cost</td><td style="padding-bottom: 1.5pt; font-weight: bold">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="width: 40%; text-align: left">Corporate Bonds</td><td style="width: 2%">&#160;</td>
    <td style="width: 1%; text-align: left">$</td><td id="xdx_983_eus-gaap--MoneyMarketFundsAtCarryingValue_iI_pn3n3_c20220731__us-gaap--InvestmentTypeAxis__custom--CorporateBondsMember_zbVEsGcwCJ3e" style="width: 16%; text-align: right">31,853</td><td style="width: 1%; text-align: left">&#160;</td><td style="width: 2%">&#160;</td>
    <td style="width: 1%; text-align: left">$</td><td id="xdx_989_eus-gaap--UnrealizedGainLossOnInvestments_pn3n3_c20220501__20220731__us-gaap--InvestmentTypeAxis__custom--CorporateBondsMember_zMPadx01Tevd" style="width: 16%; text-align: right" title="Unrealized Gains (Losses)">151</td><td style="width: 1%; text-align: left"/><td style="width: 2%">&#160;</td>
    <td style="width: 1%; text-align: left">$</td><td id="xdx_98D_eus-gaap--InvestmentOwnedAtCost_iI_pn3n3_c20220731__us-gaap--InvestmentTypeAxis__custom--CorporateBondsMember_ztHmMv2Rflw8" style="width: 16%; text-align: right" title="Total Cost">32,004</td><td style="width: 1%; text-align: left">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td style="text-align: left">Government Bonds &amp; Notes</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td id="xdx_987_eus-gaap--MoneyMarketFundsAtCarryingValue_iI_pn3n3_c20220731__us-gaap--InvestmentTypeAxis__custom--GovernmentBondsandNotesMember_zfwFI7aojBy7" style="text-align: right">7,986</td><td style="text-align: left">&#160;</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td id="xdx_984_eus-gaap--UnrealizedGainLossOnInvestments_pn3n3_c20220501__20220731__us-gaap--InvestmentTypeAxis__custom--GovernmentBondsandNotesMember_z5g7p8zQmrRh" style="text-align: right"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0">15</p></td><td style="text-align: left"/><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td id="xdx_989_eus-gaap--InvestmentOwnedAtCost_iI_pn3n3_c20220731__us-gaap--InvestmentTypeAxis__custom--GovernmentBondsandNotesMember_zF5pwijoQtUi" style="text-align: right">8,001</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">Government Agency</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td id="xdx_98E_eus-gaap--MoneyMarketFundsAtCarryingValue_iI_pn3n3_c20220731__us-gaap--InvestmentTypeAxis__custom--GovernmentAgencyMember_zWw5N1mEYX6h" style="text-align: right">2,498</td><td style="text-align: left">&#160;</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td id="xdx_989_eus-gaap--UnrealizedGainLossOnInvestments_pn3n3_c20220501__20220731__us-gaap--InvestmentTypeAxis__custom--GovernmentAgencyMember_zeDcORknoR4l" style="text-align: right">11</td><td style="text-align: left"/><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td id="xdx_98B_eus-gaap--InvestmentOwnedAtCost_iI_pn3n3_c20220731__us-gaap--InvestmentTypeAxis__custom--GovernmentAgencyMember_zO4lZrYtZWm9" style="text-align: right">2,509</td><td style="text-align: left">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td style="padding-bottom: 1.5pt; text-align: left">Accrued Interest</td><td style="padding-bottom: 1.5pt">&#160;</td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left">&#160;</td><td id="xdx_987_eus-gaap--MoneyMarketFundsAtCarryingValue_iI_pn3n3_c20220731__us-gaap--InvestmentTypeAxis__custom--AccuredInterestMember_z47q2mQiLDw" style="border-bottom: Black 1.5pt solid; text-align: right">311</td><td style="padding-bottom: 1.5pt; text-align: left">&#160;</td><td style="padding-bottom: 1.5pt">&#160;</td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left">&#160;</td><td id="xdx_982_eus-gaap--UnrealizedGainLossOnInvestments_pn3n3_c20220501__20220731__us-gaap--InvestmentTypeAxis__custom--AccuredInterestMember_zT3RaadU94yi" style="border-bottom: Black 1.5pt solid; text-align: right"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0">(101</p></td><td style="padding-bottom: 1.5pt; text-align: left">)</td><td style="padding-bottom: 1.5pt">&#160;</td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left">&#160;</td><td id="xdx_987_eus-gaap--InvestmentOwnedAtCost_iI_pn3n3_c20220731__us-gaap--InvestmentTypeAxis__custom--AccuredInterestMember_zdvAi8j3uMvc" style="border-bottom: Black 1.5pt solid; text-align: right">210</td><td style="padding-bottom: 1.5pt; text-align: left">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left; padding-bottom: 2.5pt">Total Marketable Securities</td><td style="padding-bottom: 2.5pt">&#160;</td>
    <td style="border-bottom: Black 2.5pt double; text-align: left">$</td><td id="xdx_98C_eus-gaap--MoneyMarketFundsAtCarryingValue_iI_pn3n3_c20220731_zakQom9mo99e" style="border-bottom: Black 2.5pt double; text-align: right" title="Market Value">42,648</td><td style="padding-bottom: 2.5pt; text-align: left">&#160;</td><td style="padding-bottom: 2.5pt">&#160;</td>
    <td style="border-bottom: Black 2.5pt double; text-align: left">$</td><td id="xdx_98F_eus-gaap--UnrealizedGainLossOnInvestments_pn3n3_c20220501__20220731_zETDZCRAGEye" style="border-bottom: Black 2.5pt double; text-align: right" title="Unrealized Gains (Losses)">(76</td><td style="padding-bottom: 2.5pt; text-align: left">)</td><td style="padding-bottom: 2.5pt">&#160;</td>
    <td style="border-bottom: Black 2.5pt double; text-align: left">$</td><td id="xdx_986_eus-gaap--InvestmentOwnedAtCost_iI_pn3n3_c20220731_zV6uJbdPQM6i" style="border-bottom: Black 2.5pt double; text-align: right" title="Total Cost">42,724</td><td style="padding-bottom: 2.5pt; text-align: left">&#160;</td></tr>
  </table>

<p id="xdx_8A0_z93hOAE3fV8j" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>&#160;</i></b></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="Show.showAR( this, 'defref_us-gaap_ConcentrationRiskCreditRisk', window );">Concentration of Credit Risk</a></td>
<td class="text"><p id="xdx_843_eus-gaap--ConcentrationRiskCreditRisk_zhyngZhx0eec" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>(d)
<span id="xdx_86A_zd4lzaSIJqL5">Concentration of Credit Risk</span></i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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 trade accounts receivable, marketable securities
and cash. The Company believes that its credit risk is limited because the Company&#8217;s current contracts are with companies with
a reliable payment history. The Company invests its excess cash in a money market fund and short term held-to maturity investment and
does not believe that it is exposed to any significant risks related to its cash accounts, money market fund, or held-to maturity investments.
Cash is also maintained at foreign financial institutions. Cash in foreign financial institutions as of July 31, 2022 was approximately
$<span id="xdx_901_eus-gaap--CashAndCashEquivalentsAtCarryingValue_iI_c20220731__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--ForeignFinancialInstitutionsMember_zSrmd6XLlCah" title="Cash and cash equivalents">24,000</span>.</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">&#160;</span></p>




<p style="font: 10pt Times New Roman, Times, Serif; text-align: center; 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">For the three months ended July 31, 2022 and 2021, the Company had three
and two customers whose revenues accounted for at least 10% of the Company&#8217;s consolidated revenues, respectively. These revenue
accounted for approximately <span id="xdx_90A_eus-gaap--ConcentrationRiskPercentage1_pid_dp_uPure_c20220501__20220731__us-gaap--ConcentrationRiskByBenchmarkAxis__us-gaap--SalesRevenueNetMember__us-gaap--ConcentrationRiskByTypeAxis__us-gaap--CustomerConcentrationRiskMember__srt--MajorCustomersAxis__custom--ThreeAndTwoCustomersMember_zZULkty2L83i" title="Concentration risk percentage">69%</span> and <span id="xdx_90E_eus-gaap--ConcentrationRiskPercentage1_pid_dp_uPure_c20210501__20210731__us-gaap--ConcentrationRiskByBenchmarkAxis__us-gaap--SalesRevenueNetMember__us-gaap--ConcentrationRiskByTypeAxis__us-gaap--CustomerConcentrationRiskMember__srt--MajorCustomersAxis__custom--ThreeAndTwoCustomersMember_zWyNdRNlwj2d" title="Concentration risk percentage">88%</span> of the Company&#8217;s total revenue for the respective periods.</span></p>

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


<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>&#160;</i></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="Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy', window );">Share-Based Compensation</a></td>
<td class="text"><p id="xdx_844_eus-gaap--ShareBasedCompensationOptionAndIncentivePlansPolicy_zOFgg3OGWX34" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>(e)
<span id="xdx_861_zuRz3CqFkZa6">Share-Based Compensation</span></i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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
aggregate share-based compensation expense recorded in the Consolidated Statements of Operations for the three months ended July 31,
2022 and 2021 was approximately $<span id="xdx_904_eus-gaap--EmployeeBenefitsAndShareBasedCompensation_pn5n6_c20220501__20220731_zYP0Yjn2N4De" title="Share based compensation">0.3</span> million and $<span id="xdx_90C_eus-gaap--EmployeeBenefitsAndShareBasedCompensation_pn5n6_c20210501__20210731_zcJcrwZiD7m3" title="Share based compensation">0.4</span> million, respectively.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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="Show.showAR( this, 'defref_us-gaap_RevenueFromContractWithCustomerPolicyTextBlock', window );">Revenue Recognition</a></td>
<td class="text"><p id="xdx_84C_eus-gaap--RevenueFromContractWithCustomerPolicyTextBlock_zmUPHVYHhezi" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(f)
<i><span id="xdx_867_zjoHurDamM4d">Revenue Recognition</span></i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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 July 31, 2022 and 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 in costs of goods sold, and regular shipping and handling activities charged to operating
expenses.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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 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 labor hours 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-top: 0pt; margin-bottom: 0pt; 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; text-align: center; 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-top: 0pt; margin-bottom: 0pt; margin-left: 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, fixed-price contracts, time and material agreements, or lease agreements. 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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 three-month periods ended July 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Time
and materials agreements are billed based solely on the cost of time spent working on the contract and the material used.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">As
of July 31, 2022, the Company&#8217;s total remaining performance obligations, also referred to as backlog, totaled $<span id="xdx_902_eus-gaap--RevenueRemainingPerformanceObligation_iI_pn5n6_c20220731_zKAvsRrnxtCe" title="Revenue remaining performance obligation">0.3</span> million. The
Company expects to recognize <span id="xdx_90E_ecustom--RevenueRemainingPerformancesObligationPercentage_pid_dp_uPure_c20220501__20220731_zTXiNH9SEdVg" title="Revenue remaining performance obligation, percentage">100</span>%, or $<span id="xdx_907_eus-gaap--RevenueRemainingPerformanceObligation_iI_pn5n6_c20220731_zZI2Z4Rjj0u" title="Revenue remaining performance obligation">0.3</span> million, of the remaining performance obligations as revenue over the next twelve months.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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&#174;&#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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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 operating leases.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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 Statement of Operations.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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="Show.showAR( this, 'defref_us-gaap_EarningsPerSharePolicyTextBlock', window );">Net Loss per Common Share</a></td>
<td class="text"><p id="xdx_84F_eus-gaap--EarningsPerSharePolicyTextBlock_znJF9QQGkLy5" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>(g)
<span id="xdx_866_zf9WVT2MM7E9">Net Loss per Common Share</span></i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Basic
and diluted net loss per 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 period. 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 the basic earnings per share number. Due
to the Company&#8217;s net losses, potentially dilutive securities, consisting of options to purchase shares of common stock, potential
exercises of warrants on common stock and unvested restricted stock issued to employees and non-employee directors, were excluded from
the diluted loss per share calculation due to their anti-dilutive effect.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">In
computing diluted net loss per share on the Consolidated Statement of Operations, potential exercises of warrants on 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_pid_c20220501__20220731_zlWXvMhyVAb1" title="Antidilutive securities earnings per share">6,378,218</span>
and <span id="xdx_90C_eus-gaap--AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_pid_c20210501__20210731_zG7Kn0DuRnTa">5,243,647</span> for the three months ended July 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-top: 0pt; margin-bottom: 0pt; margin-left: 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="Show.showAR( this, 'defref_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock', window );">Recently Issued Accounting Standards</a></td>
<td class="text"><p id="xdx_84A_eus-gaap--NewAccountingPronouncementsPolicyPolicyTextBlock_zLTdh0sXipBf" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b><i>(h)
<span id="xdx_861_zCViT2nSy448">Recently Issued Accounting Standards</span></i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span 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; margin-left: 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 the adoption of ASU 2016-13 will have on its consolidated financial statements.</span></p>

<span></span>
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<a href="javascript:void(0);" onclick="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>
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<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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>
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<a href="javascript:void(0);" onclick="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="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="Show.toggleNext( this );">- Definition</a><div><p>Disclosure of accounting policy for revenue from contract with customer.</p></div>
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<a href="javascript:void(0);" onclick="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="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="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 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (f)(2)(ii)<br> -URI https://asc.fasb.org/extlink&amp;oid=128089324&amp;loc=d3e5070-113901<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 50<br> -Paragraph 2<br> -Subparagraph (f)(1)<br> -URI https://asc.fasb.org/extlink&amp;oid=128089324&amp;loc=d3e5070-113901<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 50<br> -Paragraph 2<br> -Subparagraph (b)<br> -URI https://asc.fasb.org/extlink&amp;oid=128089324&amp;loc=d3e5070-113901<br><br>Reference 4: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (f)(2)(v)<br> -URI https://asc.fasb.org/extlink&amp;oid=128089324&amp;loc=d3e5070-113901<br><br>Reference 5: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -URI https://asc.fasb.org/topic&amp;trid=2228938<br><br>Reference 6: http://www.xbrl.org/2003/role/disclosureRef<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.Q6)<br> -URI https://asc.fasb.org/extlink&amp;oid=122041274&amp;loc=d3e301413-122809<br><br>Reference 7: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (f)(2)<br> -URI https://asc.fasb.org/extlink&amp;oid=128089324&amp;loc=d3e5070-113901<br><br>Reference 8: http://www.xbrl.org/2003/role/disclosureRef<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 https://asc.fasb.org/extlink&amp;oid=128089324&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_ShareBasedCompensationOptionAndIncentivePlansPolicy</td>
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<a href="javascript:void(0);" onclick="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>
<a href="javascript:void(0);" onclick="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 12<br> -URI https://asc.fasb.org/extlink&amp;oid=99393423&amp;loc=d3e6191-108592<br><br>Reference 2: 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 11<br> -URI https://asc.fasb.org/extlink&amp;oid=99393423&amp;loc=d3e6161-108592<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 275<br> -SubTopic 10<br> -Section 50<br> -Paragraph 9<br> -URI https://asc.fasb.org/extlink&amp;oid=99393423&amp;loc=d3e6143-108592<br><br>Reference 4: 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 (b)<br> -URI https://asc.fasb.org/extlink&amp;oid=99393423&amp;loc=d3e5967-108592<br><br>Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 275<br> -SubTopic 10<br> -Section 50<br> -Paragraph 4<br> -URI https://asc.fasb.org/extlink&amp;oid=99393423&amp;loc=d3e6061-108592<br><br>Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 275<br> -SubTopic 10<br> -Section 50<br> -Paragraph 8<br> -URI https://asc.fasb.org/extlink&amp;oid=99393423&amp;loc=d3e6132-108592<br><br>Reference 7: 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 (c)<br> -URI https://asc.fasb.org/extlink&amp;oid=99393423&amp;loc=d3e5967-108592<br></p></div>
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<tr>
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<span style="display: none;">v3.22.2.2</span><table class="report" border="0" cellspacing="2" id="idm140132826774240">
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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">3 Months Ended</th>
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<tr><th class="th"><div>Jul. 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="Show.showAR( this, 'defref_us-gaap_AccountingPoliciesAbstract', window );"><strong>Accounting Policies [Abstract]</strong></a></td>
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    <td style="border-bottom: Black 1.5pt solid; text-align: left">&#160;</td><td id="xdx_980_eus-gaap--CashAndCashEquivalentsAtCarryingValue_iI_pn3n3_c20220430__us-gaap--CashAndCashEquivalentsAxis__us-gaap--MoneyMarketFundsMember_zfhRJOMZL0Kf" style="border-bottom: Black 1.5pt solid; text-align: right" title="Cash and cash equivalents">6,070</td><td style="padding-bottom: 1.5pt; text-align: left">&#160;</td></tr>
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    <td style="border-bottom: Black 2.5pt double; text-align: left">$</td><td id="xdx_98E_eus-gaap--CashAndCashEquivalentsAtCarryingValue_iI_pn3n3_c20220430_zlkkwhY2mE2i" style="border-bottom: Black 2.5pt double; text-align: right" title="Cash and cash equivalents">7,885</td><td style="padding-bottom: 2.5pt; text-align: left">&#160;</td></tr>
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<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_ScheduleOfRestrictedCashAndCashEquivalentsTextBlock', window );">Schedule of Cash and Cash Equivalents and Restricted Cash</a></td>
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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>

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<td class="text"><p id="xdx_89C_eus-gaap--UnrealizedGainLossOnInvestmentsTableTextBlock_zy0USolL0Yg8" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify">&#160;</p>

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<span style="display: none;">v3.22.2.2</span><table class="report" border="0" cellspacing="2" id="idm140132827219968">
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<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Account Receivable, Contract Assets and Contract Liabilities (Tables)<br></strong></div></th>
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<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">&#160;</span></p>




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<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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="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="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_ScheduleOfAccountsReceivableContractAssetsAndContractLiabilitiesTableTextBlock</td>
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<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability.</p></div>
<a href="javascript:void(0);" onclick="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 606<br> -SubTopic 10<br> -Section 50<br> -Paragraph 10<br> -URI https://asc.fasb.org/extlink&amp;oid=126920106&amp;loc=SL49130551-203045<br></p></div>
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<tr>
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<span style="display: none;">v3.22.2.2</span><table class="report" border="0" cellspacing="2" id="idm140132827285792">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Inventory (Tables)<br></strong></div></th>
<th class="th" colspan="1">3 Months Ended</th>
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<tr><th class="th"><div>Jul. 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="Show.showAR( this, 'defref_us-gaap_InventoryDisclosureAbstract', window );"><strong>Inventory Disclosure [Abstract]</strong></a></td>
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<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_ScheduleOfInventoryCurrentTableTextBlock', window );">Schedule of Inventory</a></td>
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Company holds inventory related to the production of its WAM-V&#174; and PowerBuoy&#174; products.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span id="xdx_8B1_zOqubA4p26kb" style="display: none">Schedule of Inventory</span></p>

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<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Tabular disclosure of the carrying amount as of the balance sheet date of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process.</p></div>
<a href="javascript:void(0);" onclick="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(6)(c))<br> -URI https://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 S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(6)(b))<br> -URI https://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 S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(6)(a))<br> -URI https://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 50<br> -Paragraph 1<br> -URI https://asc.fasb.org/extlink&amp;oid=6361739&amp;loc=d3e7789-107766<br></p></div>
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<span style="display: none;">v3.22.2.2</span><table class="report" border="0" cellspacing="2" id="idm140132827434800">
<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">3 Months Ended</th>
</tr>
<tr><th class="th"><div>Jul. 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="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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<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_ScheduleOfOtherCurrentAssetsTableTextBlock', window );">Schedule of Other Current Assets</a></td>
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<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span id="xdx_8B8_ztn9j7Q0lks1" style="display: none">Schedule of Other Current Assets</span></p>

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<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="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="Show.toggleNext( this );">- Definition</a><div><p>Tabular disclosure of the carrying amounts of other current assets.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
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<span style="display: none;">v3.22.2.2</span><table class="report" border="0" cellspacing="2" id="idm140132827440672">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Property and Equipment, net (Tables)<br></strong></div></th>
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<tr><th class="th"><div>Jul. 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="Show.showAR( this, 'defref_us-gaap_PropertyPlantAndEquipmentAbstract', window );"><strong>Property, Plant and Equipment [Abstract]</strong></a></td>
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<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_PropertyPlantAndEquipmentTextBlock', window );">Schedule of Components of Property and Equipment</a></td>
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<a href="javascript:void(0);" onclick="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>
<td style="white-space:nowrap;">us-gaap_PropertyPlantAndEquipmentAbstract</td>
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<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation.</p></div>
<a href="javascript:void(0);" onclick="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> -URI https://asc.fasb.org/extlink&amp;oid=6391035&amp;loc=d3e2868-110229<br></p></div>
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<td style="white-space:nowrap;">us-gaap_PropertyPlantAndEquipmentTextBlock</td>
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<span style="display: none;">v3.22.2.2</span><table class="report" border="0" cellspacing="2" id="idm140132826932528">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Leases (Tables)<br></strong></div></th>
<th class="th" colspan="1">3 Months Ended</th>
</tr>
<tr><th class="th"><div>Jul. 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="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="Show.showAR( this, 'defref_us-gaap_LeaseCostTableTextBlock', window );">Schedule of Operating Lease Costs</a></td>
<td class="text"><p id="xdx_89B_eus-gaap--LeaseCostTableTextBlock_zT71OthNK1j3" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
components of lease expense in the Consolidated Statement of Operations for the three months ended July 31, 2022 and 2021 were as follows:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_8BD_znWq8iTPtaB8" 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%">
  <tr style="display: none; vertical-align: bottom; background-color: White">
    <td style="text-align: left; padding-bottom: 1.5pt">&#160;</td><td style="padding-bottom: 1.5pt">&#160;</td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left">&#160;</td><td id="xdx_49C_20220501__20220731_zCcPtfLOLTn7" style="border-bottom: Black 1.5pt solid; text-align: right">&#160;</td><td style="padding-bottom: 1.5pt; text-align: left">&#160;</td><td style="padding-bottom: 1.5pt">&#160;</td>
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<tr style="vertical-align: bottom">
    <td>&#160;</td><td style="font-weight: bold; padding-bottom: 1.5pt">&#160;</td>
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  <tr style="vertical-align: bottom">
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  <tr style="vertical-align: bottom">
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    <td style="width: 60%; text-align: left">Operating lease cost</td><td style="width: 2%">&#160;</td>
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    <td style="text-align: left; padding-bottom: 2.5pt">Total lease cost</td><td style="padding-bottom: 2.5pt">&#160;</td>
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<span></span>
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<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_OPTT_ScheduleOfRightofUseAssetsAndLeaseLiabilitiesTableTextBlock', window );">Schedule of Right-of Use Assets and Lease Liabilities</a></td>
<td class="text"><p id="xdx_89D_ecustom--ScheduleOfRightofUseAssetsAndLeaseLiabilitiesTableTextBlock_z1ouH9rNEz5i" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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 July 31, 2022 was as follows:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_8B7_zSm0ZGkHyu48" 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="display: none; vertical-align: bottom; background-color: White">
    <td style="padding-left: 10pt; text-align: left">&#160;</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td id="xdx_490_20220731_zb300GULtnU8" style="text-align: right">&#160;</td><td style="text-align: left">&#160;</td></tr>
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    <td>&#160;</td><td style="font-weight: bold; padding-bottom: 1.5pt">&#160;</td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center">July 31, 2022</td><td style="padding-bottom: 1.5pt; font-weight: bold">&#160;</td></tr>
  <tr style="vertical-align: bottom">
    <td>&#160;</td><td>&#160;</td>
    <td colspan="2" style="text-align: center">(in thousands)</td><td>&#160;</td></tr>
  <tr style="vertical-align: bottom">
    <td>&#160;</td><td>&#160;</td>
    <td colspan="2" style="text-align: right">&#160;</td><td>&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-decoration: underline; text-align: left">Operating lease:</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 id="xdx_40C_eus-gaap--OperatingLeaseRightOfUseAsset_iI_pn3n3" style="vertical-align: bottom; background-color: White">
    <td style="width: 78%; text-align: left; padding-bottom: 2.5pt">Operating right-of-use asset, net</td><td style="width: 2%; padding-bottom: 2.5pt">&#160;</td>
    <td style="border-bottom: Black 2.5pt double; width: 1%; text-align: left">$</td><td style="border-bottom: Black 2.5pt double; width: 18%; text-align: right">677</td><td style="width: 1%; padding-bottom: 2.5pt; text-align: left">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td>&#160;</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td style="text-align: right">&#160;</td><td style="text-align: left">&#160;</td></tr>
  <tr id="xdx_40F_eus-gaap--OperatingLeaseLiabilityCurrent_iI_pn3n3_maOLLzIil_zXIAAQEHCHte" style="vertical-align: bottom; background-color: White">
    <td style="padding-left: 10pt; text-align: left">Right-of-use liability- current</td><td>&#160;</td>
    <td style="text-align: left">$</td><td style="text-align: right">328</td><td style="text-align: left">&#160;</td></tr>
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  <tr id="xdx_402_eus-gaap--OperatingLeaseLiability_iTI_pn3n3_mtOLLzIil_zw9I5Mw2Jsnh" style="vertical-align: bottom; background-color: White">
    <td style="text-align: left; padding-bottom: 2.5pt">Total lease liability</td><td style="padding-bottom: 2.5pt">&#160;</td>
    <td style="border-bottom: Black 2.5pt double; text-align: left">$</td><td style="border-bottom: Black 2.5pt double; text-align: right">774</td><td style="padding-bottom: 2.5pt; text-align: left">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td>&#160;</td><td>&#160;</td>
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  <tr style="vertical-align: bottom; background-color: White">
    <td style="text-align: left">Weighted average remaining lease term- operating leases</td><td>&#160;</td>
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  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left">Weighted average discount rate- operating leases</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td style="text-align: right"><span id="xdx_909_eus-gaap--OperatingLeaseWeightedAverageDiscountRatePercent_iI_pid_dp_uPure_c20220731_z0x168XEjxH4" title="Weighted average discount rate- operating leases">8.3</span></td><td style="text-align: left">%</td></tr>
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<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="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_z5pFD9dQYgbi" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_8B9_zmD5Qf1s51Ua" 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="display: none; vertical-align: bottom; background-color: White">
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    <td style="text-align: left">&#160;</td><td id="xdx_493_20220731_zVrudzp6PSl5" style="text-align: right">&#160;</td><td style="text-align: left">&#160;</td></tr>
<tr style="vertical-align: bottom">
    <td style="text-align: left">&#160;</td><td style="font-weight: bold; padding-bottom: 1.5pt">&#160;</td>
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  <tr style="vertical-align: bottom">
    <td style="text-align: left">&#160;</td><td>&#160;</td>
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  <tr style="vertical-align: bottom">
    <td style="text-align: left">&#160;</td><td>&#160;</td>
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    <td style="width: 78%; text-align: left">Remainder of fiscal year 2023</td><td style="width: 2%">&#160;</td>
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  <tr id="xdx_401_eus-gaap--LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_iI_pn3n3_maLOLLPzbOq_ziYJm2x4JMMi" style="vertical-align: bottom; background-color: White">
    <td style="text-align: left">2024</td><td>&#160;</td>
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  <tr id="xdx_403_eus-gaap--LesseeOperatingLeaseLiabilityPaymentsDueYearThree_iI_pn3n3_maLOLLPzbOq_zRPkEiCD2Deh" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left">2025</td><td>&#160;</td>
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    <td style="text-align: left">$</td><td style="text-align: right">841</td><td style="text-align: left">&#160;</td></tr>
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    <td style="text-align: left; padding-bottom: 2.5pt">Total</td><td style="padding-bottom: 2.5pt">&#160;</td>
    <td style="border-bottom: Black 2.5pt double; text-align: left">$</td><td style="border-bottom: Black 2.5pt double; text-align: right">774</td><td style="padding-bottom: 2.5pt; text-align: left">&#160;</td></tr>
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<p style="font: 10pt Times New Roman, Times, Serif; text-align: center; 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; text-align: center; margin-top: 0pt; margin-bottom: 0pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>&#160;</b></span></p>

<span></span>
</td>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_DisclosureLeasesAbstract">
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<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_ScheduleOfRightofUseAssetsAndLeaseLiabilitiesTableTextBlock">
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<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Schedule Of Right of Use Assets And Lease Liabilities [Table Text Block]</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="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="Show.toggleNext( this );">- Definition</a><div><p>Tabular disclosure of lessee's lease cost. Includes, but is not limited to, interest expense for finance lease, amortization of right-of-use asset for finance lease, operating lease cost, short-term lease cost, variable lease cost and sublease income.</p></div>
<a href="javascript:void(0);" onclick="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 https://asc.fasb.org/extlink&amp;oid=128292326&amp;loc=SL77918686-209980<br></p></div>
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<td><strong> Name:</strong></td>
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<a href="javascript:void(0);" onclick="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>
<a href="javascript:void(0);" onclick="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 https://asc.fasb.org/extlink&amp;oid=128292326&amp;loc=SL77918701-209980<br></p></div>
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<tr>
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<span style="display: none;">v3.22.2.2</span><table class="report" border="0" cellspacing="2" id="idm140132827348016">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Accrued Expenses (Tables)<br></strong></div></th>
<th class="th" colspan="1">3 Months Ended</th>
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<tr><th class="th"><div>Jul. 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="Show.showAR( this, 'defref_us-gaap_PayablesAndAccrualsAbstract', window );"><strong>Payables and Accruals [Abstract]</strong></a></td>
<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="Show.showAR( this, 'defref_us-gaap_ScheduleOfAccruedLiabilitiesTableTextBlock', window );">Schedule of Accrued Expenses</a></td>
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<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#160;<span id="xdx_8B2_zN41mf7hFlB" style="display: none">Schedule of Accrued Expenses</span></span></p>

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<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
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<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Tabular disclosure of the components of accrued liabilities.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
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<span style="display: none;">v3.22.2.2</span><table class="report" border="0" cellspacing="2" id="idm140132826677168">
<tr>
<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">3 Months Ended</th>
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<tr><th class="th"><div>Jul. 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="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>
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  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Exercised</span></td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td id="xdx_982_eus-gaap--StockIssuedDuringPeriodSharesStockOptionsExercised_iN_pid_di_c20220501__20220731_z6nBa1ZZjQjk" style="text-align: right" title="Shares Underlying Options Outstanding, Exercised"><span style="-sec-ix-hidden: xdx2ixbrl0791">&#8212;</span></td><td style="text-align: left"/><td>&#160;</td>
    <td style="text-align: left">$</td><td id="xdx_98D_eus-gaap--ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_pid_c20220501__20220731_zQ5jD7AZKA45" style="text-align: right" title="Weighted Average Exercise Price, Exercised"><span style="-sec-ix-hidden: xdx2ixbrl0793">&#8212;</span></td><td style="text-align: left">&#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: White">
    <td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Cancelled/forfeited</span></td><td style="padding-bottom: 1.5pt">&#160;</td>
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    <td style="padding-bottom: 1.5pt; text-align: left">&#160;</td><td style="padding-bottom: 1.5pt; text-align: right">&#160;</td><td style="padding-bottom: 1.5pt; 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"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Outstanding as of July 31, 2022</span></td><td style="padding-bottom: 2.5pt">&#160;</td>
    <td style="border-bottom: Black 2.5pt double; text-align: left">&#160;</td><td id="xdx_989_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_iE_pid_c20220501__20220731_zJYs99hW4h3g" style="border-bottom: Black 2.5pt double; text-align: right" title="Shares underlying options outstanding, ending">1,110,319</td><td style="padding-bottom: 2.5pt; text-align: left">&#160;</td><td style="padding-bottom: 2.5pt">&#160;</td>
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  <tr style="vertical-align: bottom; background-color: White">
    <td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Exercisable as of July 31, 2022</span></td><td style="padding-bottom: 2.5pt">&#160;</td>
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    <td style="padding-bottom: 2.5pt; text-align: left">$</td><td id="xdx_98F_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_iI_pid_c20220731_zj9vLRHLH7hf" style="padding-bottom: 2.5pt; text-align: right" title="Weighted average exercise price, exercisable at ending">4.60</td><td style="padding-bottom: 2.5pt; text-align: left">&#160;</td><td style="padding-bottom: 2.5pt">&#160;</td>
    <td style="padding-bottom: 2.5pt; text-align: left">&#160;</td><td style="padding-bottom: 2.5pt; text-align: right"><span id="xdx_909_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_dtY_c20220501__20220731_zjsx83VeahO6" title="Weighted average remaining contractual term (in years), exercisable at ending">7.6</span></td><td style="padding-bottom: 2.5pt; text-align: left">&#160;</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="Show.showAR( this, 'defref_us-gaap_ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityTableTextBlock', window );">Schedule of Non-vested Restricted Stock Activity</a></td>
<td class="text"><p id="xdx_894_eus-gaap--ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityTableTextBlock_zXhzV3QLufq" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_8BA_zfnAiHlVJ1N8" 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="vertical-align: bottom">
    <td>&#160;</td><td style="padding-bottom: 1.5pt">&#160;</td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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="padding-bottom: 1.5pt">&#160;</td><td style="padding-bottom: 1.5pt">&#160;</td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Average
Price <br/>
per</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Share</b></span></p></td><td style="padding-bottom: 1.5pt">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="width: 60%; text-align: left">Unvested at April 30, 2022</td><td style="width: 2%">&#160;</td>
    <td style="width: 1%; text-align: left">&#160;</td><td id="xdx_988_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_iS_pid_c20220501__20220731__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_z8F9ER2s8fV" style="width: 16%; text-align: right" title="Number of Shares, Unvested, Beginning">827,764</td><td style="width: 1%; text-align: left">&#160;</td><td style="width: 2%">&#160;</td>
    <td style="width: 1%; text-align: left">$</td><td id="xdx_981_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_iS_pid_c20220501__20220731__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_zeS3otUL2eO6" style="width: 16%; text-align: right" title="Weighted Average Price per Share, Unvested, Beginning">1.41</td><td style="width: 1%; text-align: left">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td>Granted</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td id="xdx_983_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_pid_c20220501__20220731__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_zXrQarTRni9" style="text-align: right" title="Number of Shares, Unvested, Granted">51,500</td><td style="text-align: left">&#160;</td><td>&#160;</td>
    <td style="text-align: left">$</td><td id="xdx_984_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_pid_c20220501__20220731__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_zwKiFmztzVO3" style="text-align: right" title="Weighted Average Price per Share, Unvested, Granted">1.12</td><td style="text-align: left">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td>Vested and issued</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td id="xdx_987_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_iN_pid_di_c20220501__20220731__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_zF1erS6FPacd" style="text-align: right" title="Number of Shares, Unvested, Vested and issued">(16,667</td><td style="text-align: left">)</td><td>&#160;</td>
    <td style="text-align: left">$</td><td id="xdx_989_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_pid_c20220501__20220731__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_z0lyVGHJ7yll" style="text-align: right" title="Weighted Average Price per Share, Unvested, Vested">2.37</td><td style="text-align: left">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td style="padding-bottom: 1.5pt">Cancelled/forfeited</td><td style="padding-bottom: 1.5pt">&#160;</td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left">&#160;</td><td id="xdx_984_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_iN_pid_di_c20220501__20220731__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_zjXGo2Lej04l" style="border-bottom: Black 1.5pt solid; text-align: right" title="Number of Shares, Unvested, Cancelled/forfeited"><span style="-sec-ix-hidden: xdx2ixbrl0889">&#8212;</span></td><td style="padding-bottom: 1.5pt; text-align: left">&#160;</td><td style="padding-bottom: 1.5pt">&#160;</td>
    <td style="padding-bottom: 1.5pt; text-align: left">&#160;</td><td style="padding-bottom: 1.5pt; text-align: right">&#160;</td><td style="padding-bottom: 1.5pt; text-align: left">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left; padding-bottom: 2.5pt">Unvested at July 31, 2022</td><td style="padding-bottom: 2.5pt">&#160;</td>
    <td style="border-bottom: Black 2.5pt double; text-align: left">&#160;</td><td id="xdx_981_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_iE_pid_c20220501__20220731__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_zDrOwWfdI1I7" style="border-bottom: Black 2.5pt double; text-align: right" title="Number of Shares, Unvested, Ending">862,597</td><td style="padding-bottom: 2.5pt; text-align: left">&#160;</td><td style="padding-bottom: 2.5pt">&#160;</td>
    <td style="padding-bottom: 2.5pt; text-align: left">$</td><td id="xdx_98D_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_iE_pid_c20220501__20220731__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_zgHvsBu9eRO5" style="padding-bottom: 2.5pt; text-align: right" title="Weighted Average Price per Share, Unvested, Ending">1.38</td><td style="padding-bottom: 2.5pt; text-align: left">&#160;</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="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="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="Show.showAR( this, 'defref_us-gaap_ScheduleOfShareBasedCompensationActivityTableTextBlock', window );">Schedule of Stock Option Activity</a></td>
<td class="text"><p id="xdx_89D_eus-gaap--ScheduleOfShareBasedCompensationActivityTableTextBlock_hus-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zX3QvoeujmSl" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">A
summary of performance 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><span id="xdx_8BB_zBu4oBuwBouc" 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="vertical-align: bottom">
    <td style="text-align: left">&#160;</td><td style="padding-bottom: 1.5pt">&#160;</td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Options </b></span></p></td><td style="padding-bottom: 1.5pt">&#160;</td><td style="padding-bottom: 1.5pt">&#160;</td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Price</b></span></p></td><td style="padding-bottom: 1.5pt">&#160;</td><td style="padding-bottom: 1.5pt">&#160;</td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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="padding-bottom: 1.5pt">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="width: 46%; text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Outstanding as of April 30, 2022</span></td><td style="width: 2%">&#160;</td>
    <td style="width: 1%; text-align: left">&#160;</td><td id="xdx_98A_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_iS_pid_c20220501__20220731__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_z9dd8cYa9wVb" style="width: 14%; text-align: right" title="Shares underlying options outstanding, beginning">210,122</td><td style="width: 1%; text-align: left">&#160;</td><td style="width: 2%">&#160;</td>
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    <td style="width: 1%; text-align: left">&#160;</td><td style="width: 14%; text-align: right"><span id="xdx_90A_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_dtY_c20220501__20220731__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zpqMv7wyx0Hk" title="Weighted Average Remaining Contractual Term (In Years), Beginning">8.8</span></td><td style="width: 1%; text-align: left">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Granted</span></td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td id="xdx_987_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_pid_c20220501__20220731__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_z6q0StxPMAj7" style="text-align: right" title="Shares underlying options outstanding, granted"><span style="-sec-ix-hidden: xdx2ixbrl0835">&#8212;</span></td><td style="text-align: left">&#160;</td><td>&#160;</td>
    <td style="text-align: left">$</td><td id="xdx_98B_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_pid_c20220501__20220731__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_z4BHaOnXmyfl" style="text-align: right" title="Shares underlying options outstanding, granted"><span style="-sec-ix-hidden: xdx2ixbrl0837">&#8212;</span></td><td style="text-align: left">&#160;</td><td>&#160;</td>
    <td style="text-align: left">&#160;</td><td style="text-align: right">&#160;</td><td style="text-align: left">&#160;</td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
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<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
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<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Schedule of Cash and Cash Equivalents (Details) - USD ($)<br> $ in Thousands</strong></div></th>
<th class="th"><div>Jul. 31, 2022</div></th>
<th class="th"><div>Apr. 30, 2022</div></th>
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<td class="text">&#160;<span></span>
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<a href="javascript:void(0);" onclick="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>
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<a href="javascript:void(0);" onclick="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="Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
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<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_CashAndCashEquivalentsAxis=us-gaap_MoneyMarketFundsMember</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>
<TYPE>XML
<SEQUENCE>43
<FILENAME>R33.htm
<DESCRIPTION>IDEA: XBRL DOCUMENT
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<span style="display: none;">v3.22.2.2</span><table class="report" border="0" cellspacing="2" id="idm140132825603344">
<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="2">3 Months Ended</th>
<th class="th" colspan="1">8 Months Ended</th>
<th class="th" colspan="1"></th>
<th class="th" colspan="1"></th>
</tr>
<tr>
<th class="th"><div>Jan. 10, 2022</div></th>
<th class="th"><div>Dec. 23, 2020</div></th>
<th class="th"><div>Dec. 04, 2020</div></th>
<th class="th"><div>Sep. 18, 2020</div></th>
<th class="th"><div>Apr. 08, 2019</div></th>
<th class="th"><div>Jul. 31, 2022</div></th>
<th class="th"><div>Jul. 31, 2021</div></th>
<th class="th"><div>Jul. 31, 2021</div></th>
<th class="th"><div>Apr. 30, 2022</div></th>
<th class="th"><div>Nov. 20, 2020</div></th>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="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>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<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="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="nump">$ 5,852<span></span>
</td>
<td class="nump">$ 3,079<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="Show.showAR( this, 'defref_us-gaap_NetCashProvidedByUsedInOperatingActivities', window );">Cash in operations</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">5,092<span></span>
</td>
<td class="nump">$ 5,287<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="Show.showAR( this, 'defref_us-gaap_RetainedEarningsAccumulatedDeficit', window );">Accumulated deficit</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">259,622<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 253,770<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="Show.showAR( this, 'defref_us-gaap_Cash', window );">Cash</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">9,400<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>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_ShortTermInvestments', window );">Short-term investments</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">$ 42,700<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>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="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="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>
</tr>
<tr class="rh">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="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>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="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>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<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="Show.showAR( this, 'defref_us-gaap_ProceedsFromIssuanceOfCommonStock', window );">Proceeds from initial public offering</a></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>
<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="Show.showAR( this, 'defref_us-gaap_SaleOfStockConsiderationReceivedPerTransaction', window );">Proceeds from issuance or sale of equity, net of issuance costs</a></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>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<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="Show.showAR( this, 'defref_us-gaap_TypeOfArrangementAxis=OPTT_TwoThousandTwentyATMFacilityMember', window );">2020 ATM Facility [Member] | 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>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="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>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<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="Show.showAR( this, 'defref_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity', window );">Offering amount capacity</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">$ 100,000<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_ProceedsFromIssuanceOfCommonStock', window );">Proceeds from initial public offering</a></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>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="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">17,179,883<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="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">$ 50,000<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="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="nump">$ 2.91<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>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="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">$ 1,600<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="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>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="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>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<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="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="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>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="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="nump">$ 11,800<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>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="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="nump">$ 3.17<span></span>
</td>
<td class="text">&#160;<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="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="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>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_OPTT_PercentageOfOutstandingCommonStockLimitForShareholderApproval', window );">Percentage of outstanding common stock</a></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>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="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="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>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="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="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>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_OPTT_SaleOfStockConsiderationReceivedPerTransactionRemaining', 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="nump">$ 1,000<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>
</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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Payment of sales commission.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Percentage of outstanding common stock limit for shareholder approval.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_SaleOfStockConsiderationReceivedPerTransactionRemaining">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Sale Of Stock Consideration Received Per Transaction Remaining.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_SaleOfStockConsiderationReceivedPerTransactionRemaining</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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Aggregate purchase of common stock.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://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 https://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 946<br> -SubTopic 210<br> -Section 45<br> -Paragraph 21<br> -URI https://asc.fasb.org/extlink&amp;oid=118262064&amp;loc=SL116631419-115840<br><br>Reference 4: 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 https://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_LineOfCreditFacilityMaximumBorrowingCapacity">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.</p></div>
<a href="javascript:void(0);" onclick="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(b),22(b))<br> -URI https://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_LineOfCreditFacilityMaximumBorrowingCapacity</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_NetCashProvidedByUsedInOperatingActivities">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=126954810&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 https://asc.fasb.org/extlink&amp;oid=126954810&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 https://asc.fasb.org/extlink&amp;oid=126954810&amp;loc=d3e3602-108585<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://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 https://asc.fasb.org/extlink&amp;oid=126901519&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="Show.toggleNext( this );">+ 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_ProceedsFromIssuanceOfCommonStock">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=126954810&amp;loc=d3e3255-108585<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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>
</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_RetainedEarningsAccumulatedDeficit">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://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 https://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 944<br> -SubTopic 210<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.7-03(a)(23)(a)(4))<br> -URI https://asc.fasb.org/extlink&amp;oid=126734703&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 944<br> -SubTopic 40<br> -Section 65<br> -Paragraph 2<br> -Subparagraph (h)(2)<br> -URI https://asc.fasb.org/extlink&amp;oid=124501264&amp;loc=SL117420844-207641<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 S99<br> -Paragraph 1<br> -Subparagraph (SX 210.3-04)<br> -URI https://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 944<br> -SubTopic 40<br> -Section 65<br> -Paragraph 2<br> -Subparagraph (g)(2)(i)<br> -URI https://asc.fasb.org/extlink&amp;oid=124501264&amp;loc=SL117420844-207641<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_SaleOfStockConsiderationReceivedPerTransaction">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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>
</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_SaleOfStockNumberOfSharesIssuedInTransaction">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_SaleOfStockPricePerShare">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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>
</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_ShortTermInvestments">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Amount of investments including trading securities, available-for-sale securities, held-to-maturity securities, and short-term investments classified as other and current.</p></div>
<a href="javascript:void(0);" onclick="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(4))<br> -URI https://asc.fasb.org/extlink&amp;oid=126897435&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 942<br> -SubTopic 210<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.9-03(5))<br> -URI https://asc.fasb.org/extlink&amp;oid=126897435&amp;loc=d3e534808-122878<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 S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(8))<br> -URI https://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 944<br> -SubTopic 210<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.7-03(a)(1)(g))<br> -URI https://asc.fasb.org/extlink&amp;oid=126734703&amp;loc=d3e572229-122910<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_ShortTermInvestments</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>
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<tr>
<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>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_TypeOfArrangementAxis=OPTT_TwoThousandTwentyATMFacilityMember">
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<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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_TwoThousandTwentyATMFacilityMember</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>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
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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_dei_LegalEntityAxis=OPTT_AGPAllianceGlobalPartnersMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_LegalEntityAxis=OPTT_AGPAllianceGlobalPartnersMember</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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<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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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_StockPurchaseAgreementMember</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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<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
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<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
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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_dei_LegalEntityAxis=OPTT_AspireCapitalFundLLCMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_LegalEntityAxis=OPTT_AspireCapitalFundLLCMember</td>
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<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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<html>
<head>
<title></title>
<link rel="stylesheet" type="text/css" href="include/report.css">
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<body>
<span style="display: none;">v3.22.2.2</span><table class="report" border="0" cellspacing="2" id="idm140132824878048">
<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>Jul. 31, 2022</div></th>
<th class="th"><div>Apr. 30, 2022</div></th>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_AccountingPoliciesAbstract', window );"><strong>Accounting Policies [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="Show.showAR( this, 'defref_us-gaap_CashAndCashEquivalentsAtCarryingValue', window );">Cash and cash equivalents</a></td>
<td class="nump">$ 9,176<span></span>
</td>
<td class="nump">$ 7,885<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_RestrictedCashCurrent', window );">Restricted cash- short term</a></td>
<td class="nump">258<span></span>
</td>
<td class="nump">258<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_RestrictedCashNoncurrent', window );">Restricted cash- long term</a></td>
<td class="nump">219<span></span>
</td>
<td class="nump">219<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents', window );">Cash, cash equivalents, restricted cash and restricted cash equivalents</a></td>
<td class="nump">$ 9,653<span></span>
</td>
<td class="nump">$ 8,362<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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_AccountingPoliciesAbstract</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>
<td>duration</td>
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</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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=126954810&amp;loc=d3e3044-108585<br><br>Reference 2: 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 (a)<br> -URI https://asc.fasb.org/extlink&amp;oid=124098289&amp;loc=d3e6676-107765<br><br>Reference 3: 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(1))<br> -URI https://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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>
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<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=126954810&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 https://asc.fasb.org/extlink&amp;oid=126954810&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 https://asc.fasb.org/extlink&amp;oid=126999549&amp;loc=SL98516268-108586<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents</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>
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<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
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<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_RestrictedCashCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=126999549&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 https://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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>
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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>xbrli:monetaryItemType</td>
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<td><strong> Balance Type:</strong></td>
<td>debit</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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(17))<br> -URI https://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 230<br> -SubTopic 10<br> -Section 50<br> -Paragraph 8<br> -URI https://asc.fasb.org/extlink&amp;oid=126999549&amp;loc=SL98516268-108586<br><br>Reference 3: 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 https://asc.fasb.org/extlink&amp;oid=120413173&amp;loc=SL116631458-115580<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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>
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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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<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
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<tr>
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<td>instant</td>
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<DOCUMENT>
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<TEXT>
<html>
<head>
<title></title>
<link rel="stylesheet" type="text/css" href="include/report.css">
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<span style="display: none;">v3.22.2.2</span><table class="report" border="0" cellspacing="2" id="idm140132825539952">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Schedule of Investments and Unrealized Gains/Losses (Details)<br> $ in Thousands</strong></div></th>
<th class="th" colspan="1">3 Months Ended</th>
</tr>
<tr><th class="th">
<div>Jul. 31, 2022 </div>
<div>USD ($)</div>
</th></tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems', window );"><strong>Net Investment Income [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_MoneyMarketFundsAtCarryingValue', window );">Market Value</a></td>
<td class="nump">$ 42,648<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_UnrealizedGainLossOnInvestments', window );">Unrealized Gains (Losses)</a></td>
<td class="num">(76)<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_InvestmentOwnedAtCost', window );">Total Cost</a></td>
<td class="nump">42,724<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_InvestmentTypeAxis=OPTT_CorporateBondsMember', window );">Corporate Bonds [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="Show.showAR( this, 'defref_us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems', window );"><strong>Net Investment Income [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="Show.showAR( this, 'defref_us-gaap_MoneyMarketFundsAtCarryingValue', window );">Market Value</a></td>
<td class="nump">31,853<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_UnrealizedGainLossOnInvestments', window );">Unrealized Gains (Losses)</a></td>
<td class="nump">151<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_InvestmentOwnedAtCost', window );">Total Cost</a></td>
<td class="nump">32,004<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_InvestmentTypeAxis=OPTT_GovernmentBondsandNotesMember', window );">Government Bonds and Notes [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="Show.showAR( this, 'defref_us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems', window );"><strong>Net Investment Income [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="Show.showAR( this, 'defref_us-gaap_MoneyMarketFundsAtCarryingValue', window );">Market Value</a></td>
<td class="nump">7,986<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_UnrealizedGainLossOnInvestments', window );">Unrealized Gains (Losses)</a></td>
<td class="nump">15<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_InvestmentOwnedAtCost', window );">Total Cost</a></td>
<td class="nump">8,001<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_InvestmentTypeAxis=OPTT_GovernmentAgencyMember', window );">Government Agency [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="Show.showAR( this, 'defref_us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems', window );"><strong>Net Investment Income [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="Show.showAR( this, 'defref_us-gaap_MoneyMarketFundsAtCarryingValue', window );">Market Value</a></td>
<td class="nump">2,498<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_UnrealizedGainLossOnInvestments', window );">Unrealized Gains (Losses)</a></td>
<td class="nump">11<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_InvestmentOwnedAtCost', window );">Total Cost</a></td>
<td class="nump">2,509<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_InvestmentTypeAxis=OPTT_AccuredInterestMember', window );">Accured Interest [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="Show.showAR( this, 'defref_us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems', window );"><strong>Net Investment Income [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="Show.showAR( this, 'defref_us-gaap_MoneyMarketFundsAtCarryingValue', window );">Market Value</a></td>
<td class="nump">311<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_UnrealizedGainLossOnInvestments', window );">Unrealized Gains (Losses)</a></td>
<td class="num">(101)<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_InvestmentOwnedAtCost', window );">Total Cost</a></td>
<td class="nump">$ 210<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_InvestmentOwnedAtCost">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Cost of the investment.</p></div>
<a href="javascript:void(0);" onclick="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 946<br> -SubTopic 210<br> -Section 50<br> -Paragraph 6<br> -Subparagraph (b)<br> -URI https://asc.fasb.org/extlink&amp;oid=99383244&amp;loc=d3e12121-115841<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_InvestmentOwnedAtCost</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_MoneyMarketFundsAtCarryingValue">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Investment in short-term money-market instruments (such as commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and so forth) which are highly liquid (that is, readily convertible to known amounts of cash) and so near their maturity that they present an insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify as cash equivalents by definition. Original maturity means an original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_MoneyMarketFundsAtCarryingValue</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_ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems</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>
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<tr>
<td><strong> Period Type:</strong></td>
<td>duration</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_UnrealizedGainLossOnInvestments">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Amount of unrealized gain (loss) on investment.</p></div>
<a href="javascript:void(0);" onclick="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 https://asc.fasb.org/extlink&amp;oid=126954810&amp;loc=d3e3602-108585<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_UnrealizedGainLossOnInvestments</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_InvestmentTypeAxis=OPTT_CorporateBondsMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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_InvestmentTypeAxis=OPTT_CorporateBondsMember</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>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_InvestmentTypeAxis=OPTT_GovernmentBondsandNotesMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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_InvestmentTypeAxis=OPTT_GovernmentBondsandNotesMember</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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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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_InvestmentTypeAxis=OPTT_GovernmentAgencyMember</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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<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
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<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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_InvestmentTypeAxis=OPTT_AccuredInterestMember</td>
</tr>
<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>
</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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<html>
<head>
<title></title>
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<span style="display: none;">v3.22.2.2</span><table class="report" border="0" cellspacing="2" id="idm140132825629136">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Summary of Significant Accounting Policies (Details Narrative) - USD ($)<br></strong></div></th>
<th class="th" colspan="2">3 Months Ended</th>
<th class="th" colspan="1"></th>
<th class="th" colspan="1"></th>
</tr>
<tr>
<th class="th"><div>Jul. 31, 2022</div></th>
<th class="th"><div>Jul. 31, 2021</div></th>
<th class="th"><div>Apr. 30, 2022</div></th>
<th class="th"><div>Aug. 31, 2020</div></th>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_ProductInformationLineItems', window );"><strong>Product Information [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_AlternativeInvestment', window );">Investment securities</a></td>
<td class="nump">$ 42,700,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 49,400,000<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="Show.showAR( this, 'defref_us-gaap_InvestmentIncomeNetAmortizationOfDiscountAndPremium', window );">Discount and premium</a></td>
<td class="nump">100,000<span></span>
</td>
<td class="nump">$ 0<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="Show.showAR( this, 'defref_us-gaap_TradingSecuritiesDebtAmortizedCost', window );">Investment owned at cost</a></td>
<td class="nump">300,000<span></span>
</td>
<td class="nump">0<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="Show.showAR( this, 'defref_us-gaap_CashAndCashEquivalentsAtCarryingValue', window );">Cash and cash equivalents</a></td>
<td class="nump">9,176,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 7,885,000<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="Show.showAR( this, 'defref_us-gaap_EmployeeBenefitsAndShareBasedCompensation', window );">Share based compensation</a></td>
<td class="nump">300,000<span></span>
</td>
<td class="nump">$ 400,000<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="Show.showAR( this, 'defref_us-gaap_RevenueRemainingPerformanceObligation', window );">Revenue remaining performance obligation</a></td>
<td class="nump">$ 300,000<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="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="Show.showAR( this, 'defref_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount', window );">Antidilutive securities earnings per share</a></td>
<td class="nump">6,378,218<span></span>
</td>
<td class="nump">5,243,647<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="Show.showAR( this, 'defref_us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_SalesRevenueNetMember', window );">Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Three and Two Customers [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="Show.showAR( this, 'defref_us-gaap_ProductInformationLineItems', window );"><strong>Product Information [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="Show.showAR( this, 'defref_us-gaap_ConcentrationRiskPercentage1', window );">Concentration risk percentage</a></td>
<td class="nump">69.00%<span></span>
</td>
<td class="nump">88.00%<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="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="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_ProductInformationLineItems', window );"><strong>Product Information [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="Show.showAR( this, 'defref_OPTT_LettersOfCreditIssuedAmount', window );">Letters of credit issued amount</a></td>
<td class="nump">$ 65,000<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="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="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_ProductInformationLineItems', window );"><strong>Product Information [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="Show.showAR( this, 'defref_OPTT_LettersOfCreditIssuedAmount', window );">Letters of credit issued amount</a></td>
<td class="nump">258,000<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="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="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_ProductInformationLineItems', window );"><strong>Product Information [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="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="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="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_ProductInformationLineItems', window );"><strong>Product Information [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="Show.showAR( this, 'defref_us-gaap_CashAndCashEquivalentsAtCarryingValue', window );">Cash and cash equivalents</a></td>
<td class="nump">24,000<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="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="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_ProductInformationLineItems', window );"><strong>Product Information [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="Show.showAR( this, 'defref_us-gaap_Deposits', window );">Deposits</a></td>
<td class="nump">$ 154,000<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="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="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_ProductInformationLineItems', window );"><strong>Product Information [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="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">$ 645,000<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_LettersOfCreditIssuedAmount">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Letters of credit issued, amount.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_AlternativeInvestment">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Fair value of investment other than investment in equity security, investment in debt security and equity method investment. Includes, but is not limited to, investment in certain entities that calculate net asset value per share. Example includes, but is not limited to, investment in hedge fund, venture capital fund, private equity fund, and real estate partnership or fund.</p></div>
<a href="javascript:void(0);" onclick="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 6A<br> -Subparagraph (a)<br> -URI https://asc.fasb.org/extlink&amp;oid=126976982&amp;loc=SL6742756-110258<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 820<br> -SubTopic 10<br> -Section 35<br> -Paragraph 54B<br> -URI https://asc.fasb.org/extlink&amp;oid=126972413&amp;loc=SL7495116-110257<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_AlternativeInvestment</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_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=124432515&amp;loc=d3e3550-109257<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=126954810&amp;loc=d3e3044-108585<br><br>Reference 2: 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 (a)<br> -URI https://asc.fasb.org/extlink&amp;oid=124098289&amp;loc=d3e6676-107765<br><br>Reference 3: 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(1))<br> -URI https://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_ConcentrationRiskPercentage1">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.</p></div>
<a href="javascript:void(0);" onclick="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 42<br> -URI https://asc.fasb.org/extlink&amp;oid=126901519&amp;loc=d3e9054-108599<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 275<br> -SubTopic 10<br> -Section 50<br> -Paragraph 18<br> -URI https://asc.fasb.org/extlink&amp;oid=99393423&amp;loc=d3e6351-108592<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 825<br> -SubTopic 10<br> -Section 50<br> -Paragraph 20<br> -URI https://asc.fasb.org/extlink&amp;oid=123594938&amp;loc=d3e13531-108611<br><br>Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 825<br> -SubTopic 10<br> -Section 50<br> -Paragraph 21<br> -Subparagraph (a)<br> -URI https://asc.fasb.org/extlink&amp;oid=123594938&amp;loc=d3e13537-108611<br><br>Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 275<br> -SubTopic 10<br> -Section 50<br> -Paragraph 20<br> -URI https://asc.fasb.org/extlink&amp;oid=99393423&amp;loc=d3e6404-108592<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_ConcentrationRiskPercentage1</td>
</tr>
<tr>
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<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=126897435&amp;loc=d3e534808-122878<br></p></div>
<a href="javascript:void(0);" onclick="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="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="Show.toggleNext( this );">- Definition</a><div><p>Amount of accretion (amortization) of purchase discount (premium) on nonoperating securities.</p></div>
<a href="javascript:void(0);" onclick="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 210.5-03.8)<br> -URI https://asc.fasb.org/extlink&amp;oid=126953954&amp;loc=SL114868664-224227<br></p></div>
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<a href="javascript:void(0);" onclick="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="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="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="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="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="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="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="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 https://asc.fasb.org/extlink&amp;oid=126920106&amp;loc=SL49130556-203045<br></p></div>
<a href="javascript:void(0);" onclick="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_RevenueRemainingPerformanceObligation</td>
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<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Amortized cost of investments in debt securities classified as trading.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="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;">v3.22.2.2</span><table class="report" border="0" cellspacing="2" id="idm140132826519232">
<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>Jul. 31, 2022</div></th>
<th class="th"><div>Apr. 30, 2022</div></th>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_OPTT_DisclosureAccountReceivableContractAssetsAndContractLiabilitiesAbstract', window );"><strong>Account Receivable Contract Assets And Contract 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="Show.showAR( this, 'defref_us-gaap_AccountsReceivableNetCurrent', window );">Accounts receivable</a></td>
<td class="nump">$ 119<span></span>
</td>
<td class="nump">$ 482<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_ContractWithCustomerAssetNetCurrent', window );">Contract assets</a></td>
<td class="nump">666<span></span>
</td>
<td class="nump">386<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_ContractWithCustomerLiabilityCurrent', window );">Contract liabilities</a></td>
<td class="nump">$ 101<span></span>
</td>
<td class="nump">$ 129<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_DisclosureAccountReceivableContractAssetsAndContractLiabilitiesAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_DisclosureAccountReceivableContractAssetsAndContractLiabilitiesAbstract</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_AccountsReceivableNetCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://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 310<br> -SubTopic 10<br> -Section 45<br> -Paragraph 9<br> -URI https://asc.fasb.org/extlink&amp;oid=124259787&amp;loc=d3e4531-111522<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_ContractWithCustomerAssetNetCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=126919976&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 https://asc.fasb.org/extlink&amp;oid=126919976&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 https://asc.fasb.org/extlink&amp;oid=126920106&amp;loc=SL49130549-203045<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=126919976&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 https://asc.fasb.org/extlink&amp;oid=126919976&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 https://asc.fasb.org/extlink&amp;oid=126920106&amp;loc=SL49130549-203045<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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>
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<span style="display: none;">v3.22.2.2</span><table class="report" border="0" cellspacing="2" id="idm140132821705760">
<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">3 Months Ended</th>
</tr>
<tr>
<th class="th"><div>Jul. 31, 2022</div></th>
<th class="th"><div>Jul. 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="Show.showAR( this, 'defref_OPTT_DisclosureAccountReceivableContractAssetsAndContractLiabilitiesAbstract', window );"><strong>Account Receivable Contract Assets And Contract 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="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">$ (434)<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="Show.showAR( this, 'defref_OPTT_RevenueRecognizedAndNotBilledAsOfEndOfPeriod', window );">Revenue recognized and not billed as of the end of the period</a></td>
<td class="nump">714<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rou">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_OPTT_IncreaseDecreaseInContractWithCustomerAssets', window );">Net change in contract assets</a></td>
<td class="nump">280<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="Show.showAR( this, 'defref_us-gaap_ContractWithCustomerLiability', window );">Revenue recognized that was included in the contract liabilities balance as of the beginning of the period</a></td>
<td class="num">(91)<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="Show.showAR( this, 'defref_OPTT_PaymentsCollectedForWhichRevenueHasNotBeenRecognized', window );">Payments collected for which revenue has not been recognized</a></td>
<td class="nump">63<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="reu">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_IncreaseDecreaseInContractWithCustomerLiability', window );">Net change in contract liabilities</a></td>
<td class="num">$ (28)<span></span>
</td>
<td class="text"> <span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_DisclosureAccountReceivableContractAssetsAndContractLiabilitiesAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_DisclosureAccountReceivableContractAssetsAndContractLiabilitiesAbstract</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_OPTT_IncreaseDecreaseInContractWithCustomerAssets">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Increase decrease in contract with customer assets.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_IncreaseDecreaseInContractWithCustomerAssets</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: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_PaymentsCollectedForWhichRevenueHasNotBeenRecognized">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Revenue recognized and not billed as of the end of the period.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_PaymentsCollectedForWhichRevenueHasNotBeenRecognized</td>
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<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:monetaryItemType</td>
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<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
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<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
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<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Revenue recognized and not billed as of the end of the period.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_RevenueRecognizedAndNotBilledAsOfEndOfPeriod</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_ContractWithCustomerAssetNet">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=126920106&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 https://asc.fasb.org/extlink&amp;oid=126919976&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 https://asc.fasb.org/extlink&amp;oid=126919976&amp;loc=SL49130533-203044<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_ContractWithCustomerLiability">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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.</p></div>
<a href="javascript:void(0);" onclick="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 https://asc.fasb.org/extlink&amp;oid=126919976&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 50<br> -Paragraph 8<br> -Subparagraph (a)<br> -URI https://asc.fasb.org/extlink&amp;oid=126920106&amp;loc=SL49130549-203045<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 45<br> -Paragraph 2<br> -URI https://asc.fasb.org/extlink&amp;oid=126919976&amp;loc=SL49130532-203044<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_ContractWithCustomerLiability</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_IncreaseDecreaseInContractWithCustomerLiability">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=126954810&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 https://asc.fasb.org/extlink&amp;oid=126938201&amp;loc=d3e55415-109406<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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>
</div>
</body>
</html>
</TEXT>
</DOCUMENT>
<DOCUMENT>
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<SEQUENCE>49
<FILENAME>R39.htm
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<TEXT>
<html>
<head>
<title></title>
<link rel="stylesheet" type="text/css" href="include/report.css">
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<body>
<span style="display: none;">v3.22.2.2</span><table class="report" border="0" cellspacing="2" id="idm140132826825968">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Schedule of Inventory (Details) - USD ($)<br> $ in Thousands</strong></div></th>
<th class="th"><div>Jul. 31, 2022</div></th>
<th class="th"><div>Apr. 30, 2022</div></th>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_InventoryDisclosureAbstract', window );"><strong>Inventory 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="Show.showAR( this, 'defref_us-gaap_InventoryRawMaterials', window );">Raw Materials</a></td>
<td class="nump">$ 343<span></span>
</td>
<td class="nump">$ 198<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_InventoryWorkInProcess', window );">Work in Process</a></td>
<td class="nump">245<span></span>
</td>
<td class="nump">244<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_InventoryNet', window );">Inventory, net</a></td>
<td class="nump">$ 588<span></span>
</td>
<td class="nump">$ 442<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_InventoryDisclosureAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_InventoryDisclosureAbstract</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_InventoryNet">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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(6))<br> -URI https://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 210<br> -SubTopic 10<br> -Section 45<br> -Paragraph 1<br> -Subparagraph (b)<br> -URI https://asc.fasb.org/extlink&amp;oid=124098289&amp;loc=d3e6676-107765<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 https://asc.fasb.org/extlink&amp;oid=84165509&amp;loc=d3e56426-112766<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_InventoryRawMaterials">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Amount before valuation and LIFO reserves of raw materials expected to be sold, or consumed within one year or operating cycle, if longer.</p></div>
<a href="javascript:void(0);" onclick="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 S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(6)(a)(4))<br> -URI https://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_InventoryRawMaterials</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_InventoryWorkInProcess">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Amount before valuation and LIFO reserves of merchandise or goods in the production process expected to be completed within one year or operating cycle, if longer.</p></div>
<a href="javascript:void(0);" onclick="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 S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(6)(a)(3))<br> -URI https://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_InventoryWorkInProcess</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>
</div>
</body>
</html>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>XML
<SEQUENCE>50
<FILENAME>R40.htm
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
<html>
<head>
<title></title>
<link rel="stylesheet" type="text/css" href="include/report.css">
<script type="text/javascript" src="Show.js">/* Do Not Remove This Comment */</script><script type="text/javascript">
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</head>
<body>
<span style="display: none;">v3.22.2.2</span><table class="report" border="0" cellspacing="2" id="idm140132821809600">
<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>Jul. 31, 2022</div></th>
<th class="th"><div>Apr. 30, 2022</div></th>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="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="Show.showAR( this, 'defref_us-gaap_PrepaidInsurance', window );">Prepaid insurance</a></td>
<td class="nump">$ 97<span></span>
</td>
<td class="nump">$ 182<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="Show.showAR( this, 'defref_OPTT_PrepaidSoftwareAndLicenses', window );">Prepaid software &amp; licenses</a></td>
<td class="nump">101<span></span>
</td>
<td class="nump">127<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="Show.showAR( this, 'defref_OPTT_PrepaidSalesAndMarketing', window );">Prepaid sales &amp; marketing</a></td>
<td class="nump">91<span></span>
</td>
<td class="nump">50<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_OtherReceivablesNetCurrent', window );">Other receivables</a></td>
<td class="nump">91<span></span>
</td>
<td class="nump">24<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_OtherPrepaidExpenseCurrent', window );">Prepaid expenses- other</a></td>
<td class="nump">100<span></span>
</td>
<td class="nump">84<span></span>
</td>
</tr>
<tr class="reu">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_OtherAssetsCurrent', window );">Total other current assets</a></td>
<td class="nump">$ 480<span></span>
</td>
<td class="nump">$ 467<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Prepaid sales and marketing.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Prepaid software and licenses.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_OtherAssetsCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Amount of current assets classified as other.</p></div>
<a href="javascript:void(0);" onclick="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(8))<br> -URI https://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 https://asc.fasb.org/extlink&amp;oid=84165509&amp;loc=d3e56426-112766<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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>
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<tr>
<td><strong> Period Type:</strong></td>
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<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=6387103&amp;loc=d3e6435-108320<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(7))<br> -URI https://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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>
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<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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>
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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_us-gaap_PrepaidInsurance">
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<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://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 210<br> -SubTopic 10<br> -Section 45<br> -Paragraph 1<br> -Subparagraph (g)(1)<br> -URI https://asc.fasb.org/extlink&amp;oid=124098289&amp;loc=d3e6676-107765<br><br>Reference 3: 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 https://asc.fasb.org/extlink&amp;oid=126905020&amp;loc=d3e5879-108316<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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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<td>us-gaap_</td>
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<td>xbrli:monetaryItemType</td>
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<span style="display: none;">v3.22.2.2</span><table class="report" border="0" cellspacing="2" id="idm140132820911424">
<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>Jul. 31, 2022</div></th>
<th class="th"><div>Apr. 30, 2022</div></th>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="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="Show.showAR( this, 'defref_us-gaap_PropertyPlantAndEquipmentGross', window );">Property and equipment, gross</a></td>
<td class="nump">$ 2,086<span></span>
</td>
<td class="nump">$ 2,030<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment', window );">Less: accumulated depreciation</a></td>
<td class="num">(1,628)<span></span>
</td>
<td class="num">(1,585)<span></span>
</td>
</tr>
<tr class="rou">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_PropertyPlantAndEquipmentNet', window );">Property and equipment, net</a></td>
<td class="nump">458<span></span>
</td>
<td class="nump">445<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="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="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="Show.showAR( this, 'defref_us-gaap_PropertyPlantAndEquipmentGross', window );">Property and equipment, gross</a></td>
<td class="nump">626<span></span>
</td>
<td class="nump">615<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="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="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="Show.showAR( this, 'defref_us-gaap_PropertyPlantAndEquipmentGross', window );">Property and equipment, gross</a></td>
<td class="nump">590<span></span>
</td>
<td class="nump">571<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="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="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="Show.showAR( this, 'defref_us-gaap_PropertyPlantAndEquipmentGross', window );">Property and equipment, gross</a></td>
<td class="nump">352<span></span>
</td>
<td class="nump">352<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="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="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="Show.showAR( this, 'defref_us-gaap_PropertyPlantAndEquipmentGross', window );">Property and equipment, gross</a></td>
<td class="nump">503<span></span>
</td>
<td class="nump">477<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="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="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="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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=6391035&amp;loc=d3e2868-110229<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(14))<br> -URI https://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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>
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<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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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(13))<br> -URI https://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> -Subparagraph (b)<br> -URI https://asc.fasb.org/extlink&amp;oid=6391035&amp;loc=d3e2868-110229<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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>
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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> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
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<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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>
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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:stringItemType</td>
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<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_PropertyPlantAndEquipmentNet">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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> -URI https://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 944<br> -SubTopic 210<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.7-03(a)(8))<br> -URI https://asc.fasb.org/extlink&amp;oid=126734703&amp;loc=d3e572229-122910<br><br>Reference 3: 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 https://asc.fasb.org/extlink&amp;oid=124429447&amp;loc=SL124453093-239630<br><br>Reference 4: 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 https://asc.fasb.org/extlink&amp;oid=84165509&amp;loc=d3e56426-112766<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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>
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<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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
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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="include/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;">v3.22.2.2</span><table class="report" border="0" cellspacing="2" id="idm140132821848304">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Property and Equipment, net (Details Narrative) - USD ($)<br></strong></div></th>
<th class="th" colspan="2">3 Months Ended</th>
</tr>
<tr>
<th class="th"><div>Jul. 31, 2022</div></th>
<th class="th"><div>Jul. 31, 2021</div></th>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_PropertyPlantAndEquipmentAbstract', window );"><strong>Property, Plant and Equipment [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_Depreciation', window );">Depreciation expense</a></td>
<td class="nump">$ 43,000<span></span>
</td>
<td class="nump">$ 40,000<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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://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 https://asc.fasb.org/extlink&amp;oid=126954810&amp;loc=d3e3602-108585<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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>
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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>
</div>
</body>
</html>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>XML
<SEQUENCE>53
<FILENAME>R43.htm
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
<html>
<head>
<title></title>
<link rel="stylesheet" type="text/css" href="include/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;">v3.22.2.2</span><table class="report" border="0" cellspacing="2" id="idm140132827480352">
<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>
</tr>
<tr>
<th class="th"><div>Jul. 31, 2022</div></th>
<th class="th"><div>Jul. 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="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="Show.showAR( this, 'defref_us-gaap_OperatingLeaseCost', window );">Operating lease cost</a></td>
<td class="nump">$ 92<span></span>
</td>
<td class="nump">$ 92<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_ShortTermLeaseCost', window );">Short-term lease cost</a></td>
<td class="nump">8<span></span>
</td>
<td class="nump">5<span></span>
</td>
</tr>
<tr class="rou">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_LeaseCost', window );">Total lease cost</a></td>
<td class="nump">$ 100<span></span>
</td>
<td class="nump">$ 97<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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=128292326&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 https://asc.fasb.org/extlink&amp;oid=123414884&amp;loc=SL77918982-209971<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://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 https://asc.fasb.org/extlink&amp;oid=128292326&amp;loc=SL77918686-209980<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=128292326&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 https://asc.fasb.org/extlink&amp;oid=123414884&amp;loc=SL77918982-209971<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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>54
<FILENAME>R44.htm
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
<html>
<head>
<title></title>
<link rel="stylesheet" type="text/css" href="include/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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</head>
<body>
<span style="display: none;">v3.22.2.2</span><table class="report" border="0" cellspacing="2" id="idm140132825532464">
<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>Jul. 31, 2022</div></th>
<th class="th"><div>Apr. 30, 2022</div></th>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="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="Show.showAR( this, 'defref_us-gaap_OperatingLeaseRightOfUseAsset', window );">Operating right-of-use asset, net</a></td>
<td class="nump">$ 677<span></span>
</td>
<td class="nump">$ 752<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_OperatingLeaseLiabilityCurrent', window );">Right-of-use liability- current</a></td>
<td class="nump">328<span></span>
</td>
<td class="nump">319<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_OperatingLeaseLiabilityNoncurrent', window );">Right-of-use liability- long term</a></td>
<td class="nump">446<span></span>
</td>
<td class="nump">$ 538<span></span>
</td>
</tr>
<tr class="reu">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_OperatingLeaseLiability', window );">Total lease liability</a></td>
<td class="nump">$ 774<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="Show.showAR( this, 'defref_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1', window );">Weighted average remaining lease term- operating leases</a></td>
<td class="text">2 years 1 month 24 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="Show.showAR( this, 'defref_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent', window );">Weighted average discount rate- operating leases</a></td>
<td class="nump">8.30%<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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=123391704&amp;loc=SL77918627-209977<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=123391704&amp;loc=SL77918627-209977<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=123391704&amp;loc=SL77918627-209977<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=123391704&amp;loc=SL77918627-209977<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=128292326&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 https://asc.fasb.org/extlink&amp;oid=123414884&amp;loc=SL77918982-209971<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://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 https://asc.fasb.org/extlink&amp;oid=128292326&amp;loc=SL77918686-209980<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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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<span style="display: none;">v3.22.2.2</span><table class="report" border="0" cellspacing="2" id="idm140132826762752">
<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>Jul. 31, 2022 </div>
<div>USD ($)</div>
</th>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_OPTT_DisclosureLeasesAbstract', window );"><strong>Leases</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths', window );">Remainder of fiscal year 2023</a></td>
<td class="nump">$ 295<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo', window );">2024</a></td>
<td class="nump">362<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree', window );">2025</a></td>
<td class="nump">184<span></span>
</td>
</tr>
<tr class="reu">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue', window );">Total future minimum lease payments</a></td>
<td class="nump">841<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount', window );">Less imputed interest</a></td>
<td class="num">(67)<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_OperatingLeaseLiability', window );">Total</a></td>
<td class="nump">$ 774<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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=128292326&amp;loc=SL77918701-209980<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=128292326&amp;loc=SL77918701-209980<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=128292326&amp;loc=SL77918701-209980<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=128292326&amp;loc=SL77918701-209980<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=128292326&amp;loc=SL77918701-209980<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=123391704&amp;loc=SL77918627-209977<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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>
</div>
</body>
</html>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>XML
<SEQUENCE>56
<FILENAME>R46.htm
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
<html>
<head>
<title></title>
<link rel="stylesheet" type="text/css" href="include/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;">v3.22.2.2</span><table class="report" border="0" cellspacing="2" id="idm140132824769904">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Leases (Details Narrative) - USD ($)<br></strong></div></th>
<th class="th" colspan="2">3 Months Ended</th>
</tr>
<tr>
<th class="th"><div>Jul. 31, 2022</div></th>
<th class="th"><div>Jul. 31, 2021</div></th>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_OperatingLeasePayments', window );">Operating Lease, Payments</a></td>
<td class="nump">$ 100,000<span></span>
</td>
<td class="nump">$ 102,000<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="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>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_LesseeOperatingLeaseOptionToExtend', window );">Lessee, operating lease, option to extend</a></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="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>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_LeaseExpirationDate1', window );">Lease expiration date</a></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="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>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_LesseeOperatingLeaseOptionToExtend', window );">Lessee, operating lease, option to extend</a></td>
<td class="text">The
initial lease term is for seven years which is set to expire 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="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>
</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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=128292326&amp;loc=SL77918673-209980<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=128292326&amp;loc=SL77918673-209980<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://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 https://asc.fasb.org/extlink&amp;oid=128292326&amp;loc=SL77918686-209980<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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>
</html>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>XML
<SEQUENCE>57
<FILENAME>R47.htm
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
<html>
<head>
<title></title>
<link rel="stylesheet" type="text/css" href="include/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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</head>
<body>
<span style="display: none;">v3.22.2.2</span><table class="report" border="0" cellspacing="2" id="idm140132826709632">
<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>Jul. 31, 2022</div></th>
<th class="th"><div>Apr. 30, 2022</div></th>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="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="Show.showAR( this, 'defref_us-gaap_ConstructionPayableCurrent', window );">Project costs</a></td>
<td class="nump">$ 100<span></span>
</td>
<td class="nump">$ 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="Show.showAR( this, 'defref_us-gaap_LossContingencyAccrualCarryingValueCurrent', window );">Contract loss reserve</a></td>
<td class="nump">435<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="Show.showAR( this, 'defref_us-gaap_OtherEmployeeRelatedLiabilitiesCurrent', window );">Employee incentive payments</a></td>
<td class="nump">355<span></span>
</td>
<td class="nump">266<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_AccruedSalariesCurrent', window );">Accrued salary and benefits</a></td>
<td class="nump">31<span></span>
</td>
<td class="nump">60<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_AccruedProfessionalFeesCurrent', window );">Legal and accounting fees</a></td>
<td class="nump">24<span></span>
</td>
<td class="nump">30<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_OtherAccruedLiabilitiesCurrent', window );">Other</a></td>
<td class="nump">145<span></span>
</td>
<td class="nump">134<span></span>
</td>
</tr>
<tr class="rou">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_AccruedLiabilitiesCurrent', window );">Accrued expenses total</a></td>
<td class="nump">$ 1,090<span></span>
</td>
<td class="nump">$ 877<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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_AccruedProfessionalFeesCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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>
</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_AccruedSalariesCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://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 210<br> -SubTopic 10<br> -Section 45<br> -Paragraph 8<br> -Subparagraph (c)<br> -URI https://asc.fasb.org/extlink&amp;oid=124098289&amp;loc=d3e6935-107765<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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>
</table>
<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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 450<br> -SubTopic 20<br> -Section 50<br> -Paragraph 1<br> -URI https://asc.fasb.org/extlink&amp;oid=121557415&amp;loc=d3e14326-108349<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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>
</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_OtherAccruedLiabilitiesCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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>
<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_OtherEmployeeRelatedLiabilitiesCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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>
</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_PayablesAndAccrualsAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
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<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>
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<span style="display: none;">v3.22.2.2</span><table class="report" border="0" cellspacing="2" id="idm140132825552016">
<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. 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="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>
</tr>
<tr class="rh">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="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>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="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>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="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>
</tr>
<tr class="rh">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="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>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights', window );">Purchase of warrants</a></td>
<td class="nump">4,927,680<span></span>
</td>
<td class="nump">732,500<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="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>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="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>
</tr>
</table>
<div style="display: none;">
<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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=126973232&amp;loc=d3e21475-112644<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=126973232&amp;loc=d3e21475-112644<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_SaleOfStockNumberOfSharesIssuedInTransaction">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_WarrantsAndRightsOutstandingTerm">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=126976982&amp;loc=d3e19207-110258<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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>
</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_StatementEquityComponentsAxis=OPTT_PreFundedWarrantsMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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>
<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_StatementEquityComponentsAxis=OPTT_CommonWarrantsMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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>
</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>
<TYPE>XML
<SEQUENCE>59
<FILENAME>R49.htm
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
<html>
<head>
<title></title>
<link rel="stylesheet" type="text/css" href="include/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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<body>
<span style="display: none;">v3.22.2.2</span><table class="report" border="0" cellspacing="2" id="idm140132826592768">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Paycheck Protection Program Loan (Details Narrative) - Paycheck Protection Program [Member] - USD ($)<br></strong></div></th>
<th class="th" colspan="1"></th>
<th class="th" colspan="1">12 Months Ended</th>
</tr>
<tr>
<th class="th"><div>May 03, 2020</div></th>
<th class="th"><div>Apr. 30, 2022</div></th>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems', window );"><strong>Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_ProceedsFromLoanOriginations1', window );">Proceeds from loan originations</a></td>
<td class="nump">$ 891,000<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="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 has now been fully forgiven. The Company recognized a gain
on forgiveness of PPP loan of approximately $891,000 during the three months ended July 31, 2021.<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_DebtInstrumentInterestRateStatedPercentage', window );">Debt interest rate</a></td>
<td class="nump">100.00%<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_RepaymentsOfLongTermDebt', window );">Repayments of long-term debt</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 891,000<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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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>
</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_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://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 https://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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>
<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_ProceedsFromLoanOriginations1">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=126954810&amp;loc=d3e3179-108585<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=126954810&amp;loc=d3e3291-108585<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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>
</table>
</div>
</body>
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</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>XML
<SEQUENCE>60
<FILENAME>R50.htm
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
<html>
<head>
<title></title>
<link rel="stylesheet" type="text/css" href="include/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;">v3.22.2.2</span><table class="report" border="0" cellspacing="2" id="idm140132820804592">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Schedule of Stock Option Activity (Details)<br></strong></div></th>
<th class="th" colspan="1">3 Months Ended</th>
</tr>
<tr><th class="th">
<div>Jul. 31, 2022 </div>
<div>$ / shares </div>
<div>shares</div>
</th></tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="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="Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber', window );">Shares underlying options outstanding, beginning</a></td>
<td class="nump">1,110,356<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice', window );">Weighted average exercise price, beginning balance | $ / shares</a></td>
<td class="nump">$ 2.34<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2', window );">Weighted Average Remaining Contractual Term (In Years), Beginning</a></td>
<td class="text">9 years 2 months 12 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="Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross', window );">Shares underlying options outstanding, granted</a></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="Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice', window );">Weighted Average Exercise Price, Granted | $ / shares</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="Show.showAR( this, 'defref_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised', window );">Shares Underlying Options Outstanding, Exercised</a></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="Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice', window );">Weighted Average Exercise Price, Exercised | $ / shares</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="Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod', window );">Shares Underlying Options Outstanding, Cancelled/forfeited</a></td>
<td class="num">(37)<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice', window );">Weighted Average Exercise Price, Cancelled/forfeited | $ / shares</a></td>
<td class="nump">$ 400.00<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber', window );">Shares underlying options outstanding, ending</a></td>
<td class="nump">1,110,319<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice', window );">Weighted average exercise price, ending balance | $ / shares</a></td>
<td class="nump">$ 2.33<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="Show.showAR( this, 'defref_OPTT_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm', window );">Weighted Average Remaining Contractual Term (In Years), Ending</a></td>
<td class="text">8 years 10 months 24 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="Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber', window );">Shares Underlying Options Outstanding, Exercisable at Ending</a></td>
<td class="nump">297,467<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice', window );">Weighted average exercise price, exercisable at ending | $ / shares</a></td>
<td class="nump">$ 4.60<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1', window );">Weighted average remaining contractual term (in years), exercisable at ending</a></td>
<td class="text">7 years 7 months 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="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="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="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="Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber', window );">Shares underlying options outstanding, beginning</a></td>
<td class="nump">210,122<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice', window );">Weighted average exercise price, beginning balance | $ / shares</a></td>
<td class="nump">$ 2.20<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2', window );">Weighted Average Remaining Contractual Term (In Years), Beginning</a></td>
<td class="text">8 years 9 months 18 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="Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross', window );">Shares underlying options outstanding, granted</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="Show.showAR( this, 'defref_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised', window );">Shares Underlying Options Outstanding, Exercised</a></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="Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice', window );">Weighted Average Exercise Price, Exercised | $ / shares</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="Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod', window );">Shares Underlying Options Outstanding, Cancelled/forfeited</a></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="Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice', window );">Weighted Average Exercise Price, Cancelled/forfeited | $ / shares</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="Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber', window );">Shares underlying options outstanding, ending</a></td>
<td class="nump">210,122<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice', window );">Weighted average exercise price, ending balance | $ / shares</a></td>
<td class="nump">$ 2.20<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="Show.showAR( this, 'defref_OPTT_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm', window );">Weighted Average Remaining Contractual Term (In Years), Ending</a></td>
<td class="text">8 years 7 months 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="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="Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice', window );">Weighted average exercise price, exercisable at ending | $ / shares</a></td>
<td class="text"> <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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Weighted Average Remaining Contractual Term (In Years), Ending.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(1)(iii)<br> -URI https://asc.fasb.org/extlink&amp;oid=128089324&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(1)(iii)<br> -URI https://asc.fasb.org/extlink&amp;oid=128089324&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(1)(iv)<br> -URI https://asc.fasb.org/extlink&amp;oid=128089324&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(1)(iv)<br> -URI https://asc.fasb.org/extlink&amp;oid=128089324&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(1)(iv)(01)<br> -URI https://asc.fasb.org/extlink&amp;oid=128089324&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(1)(ii)<br> -URI https://asc.fasb.org/extlink&amp;oid=128089324&amp;loc=d3e5070-113901<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 50<br> -Paragraph 2<br> -Subparagraph (c)(1)(i)<br> -URI https://asc.fasb.org/extlink&amp;oid=128089324&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(1)(ii)<br> -URI https://asc.fasb.org/extlink&amp;oid=128089324&amp;loc=d3e5070-113901<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 50<br> -Paragraph 2<br> -Subparagraph (c)(1)(i)<br> -URI https://asc.fasb.org/extlink&amp;oid=128089324&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(1)(iv)(02)<br> -URI https://asc.fasb.org/extlink&amp;oid=128089324&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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>
</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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(1)(iv)(01)<br> -URI https://asc.fasb.org/extlink&amp;oid=128089324&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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>
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<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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=128089324&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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>
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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>xbrli:durationItemType</td>
</tr>
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<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 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=128089324&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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>
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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>xbrli:durationItemType</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>
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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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(1)(iv)(02)<br> -URI https://asc.fasb.org/extlink&amp;oid=128089324&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 https://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 https://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 https://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 https://asc.fasb.org/extlink&amp;oid=126973232&amp;loc=d3e21463-112644<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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><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>duration</td>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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>
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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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<span style="display: none;">v3.22.2.2</span><table class="report" border="0" cellspacing="2" id="idm140132825614720">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Schedule of Non-vested Restricted Stock Activity (Details) - $ / shares<br></strong></div></th>
<th class="th" colspan="2">3 Months Ended</th>
</tr>
<tr>
<th class="th"><div>Jul. 31, 2022</div></th>
<th class="th"><div>Jul. 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="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="Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod', window );">Number of Shares, Unvested, Granted</a></td>
<td class="nump">51,500<span></span>
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<td class="nump">0<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="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>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="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="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber', window );">Number of Shares, Unvested, Beginning</a></td>
<td class="nump">827,764<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="Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue', window );">Weighted Average Price per Share, Unvested, Beginning</a></td>
<td class="nump">$ 1.41<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="Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod', window );">Number of Shares, Unvested, Granted</a></td>
<td class="nump">51,500<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="Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue', window );">Weighted Average Price per Share, Unvested, Granted</a></td>
<td class="nump">$ 1.12<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="Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod', window );">Number of Shares, Unvested, Vested and issued</a></td>
<td class="num">(16,667)<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="Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue', window );">Weighted Average Price per Share, Unvested, Vested</a></td>
<td class="nump">$ 2.37<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="Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod', window );">Number of Shares, Unvested, Cancelled/forfeited</a></td>
<td class="text"> <span></span>
</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="Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber', window );">Number of Shares, Unvested, Ending</a></td>
<td class="nump">862,597<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="Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue', window );">Weighted Average Price per Share, Unvested, Ending</a></td>
<td class="nump">$ 1.38<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
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<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(2)(iii)(03)<br> -URI https://asc.fasb.org/extlink&amp;oid=128089324&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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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<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>
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<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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(2)(iii)(01)<br> -URI https://asc.fasb.org/extlink&amp;oid=128089324&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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>
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<tr>
<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>duration</td>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(2)(iii)(01)<br> -URI https://asc.fasb.org/extlink&amp;oid=128089324&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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>
</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_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(2)(ii)<br> -URI https://asc.fasb.org/extlink&amp;oid=128089324&amp;loc=d3e5070-113901<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 50<br> -Paragraph 2<br> -Subparagraph (c)(2)(i)<br> -URI https://asc.fasb.org/extlink&amp;oid=128089324&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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>
</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_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(2)(i)<br> -URI https://asc.fasb.org/extlink&amp;oid=128089324&amp;loc=d3e5070-113901<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 50<br> -Paragraph 2<br> -Subparagraph (c)(2)(ii)<br> -URI https://asc.fasb.org/extlink&amp;oid=128089324&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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>
</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_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(2)(iii)(02)<br> -URI https://asc.fasb.org/extlink&amp;oid=128089324&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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>
</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_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(2)(iii)(02)<br> -URI https://asc.fasb.org/extlink&amp;oid=128089324&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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>
</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_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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>
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<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_AwardTypeAxis=OPTT_NonVestedRestrictedStockMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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>
</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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<span style="display: none;">v3.22.2.2</span><table class="report" border="0" cellspacing="2" id="idm140132825255888">
<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="2">3 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>
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<tr>
<th class="th"><div>Jul. 31, 2022</div></th>
<th class="th"><div>Jul. 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>
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<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="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>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod', window );">Number of restricted shares, granted</a></td>
<td class="nump">51,500<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>
</tr>
<tr class="rh">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="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>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="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>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="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="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="Show.showAR( this, 'defref_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares', window );">Options, number of shares unvested</a></td>
<td class="nump">813,000<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="Show.showAR( this, 'defref_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1', window );">Weighted average remaining contractual term</a></td>
<td class="text">9 years 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="Show.showAR( this, 'defref_us-gaap_AllocatedShareBasedCompensationExpense', window );">Share-based payment arrangement, expense</a></td>
<td class="nump">$ 96,000<span></span>
</td>
<td class="nump">$ 110,000<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="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>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="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>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions', window );">Unrecognized compensation cost</a></td>
<td class="nump">$ 700,000<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="Show.showAR( this, 'defref_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1', window );">Share-based compensation of weighted-average period</a></td>
<td class="text">2 years 3 months 18 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="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>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="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>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares', window );">Options, number of shares unvested</a></td>
<td class="nump">210,000<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="Show.showAR( this, 'defref_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1', window );">Weighted average remaining contractual term</a></td>
<td class="text">8 years 7 months 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="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_AllocatedShareBasedCompensationExpense', window );">Share-based payment arrangement, expense</a></td>
<td class="nump">$ 52,500<span></span>
</td>
<td class="nump">95,000<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="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions', window );">Unrecognized compensation cost</a></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>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1', window );">Share-based compensation of weighted-average period</a></td>
<td class="text">7 months 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 custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_OPTT_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsUnvestedOutstandingIntrinsicValue', window );">Options, outstanding, intrinsic value</a></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="rh">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="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>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="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>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_AllocatedShareBasedCompensationExpense', window );">Share-based payment arrangement, expense</a></td>
<td class="nump">$ 184,000<span></span>
</td>
<td class="nump">$ 14,000<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="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1', window );">Share-based compensation of weighted-average period</a></td>
<td class="text">1 year 9 months 18 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="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions', window );">Unrecognized compensation cost</a></td>
<td class="nump">$ 821,067<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<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="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>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="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>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="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="nump">1,332,036<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_PlanNameAxis=OPTT_TwoThousandAndFifteenOmnibusIncentivePlanMember', window );">2015 Omnibus Incentive Plan [Member] | Chief Executive Officer [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>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="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>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance', window );">Capital shares reserved for future issuance</a></td>
<td class="nump">695,127<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<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="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>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="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>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="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="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="Show.showAR( this, 'defref_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance', window );">Capital shares reserved for future issuance</a></td>
<td class="nump">211,487<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_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsUnvestedOutstandingIntrinsicValue">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Unvested intrinsic value.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsUnvestedOutstandingIntrinsicValue</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_AllocatedShareBasedCompensationExpense">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (h)(1)(i)<br> -URI https://asc.fasb.org/extlink&amp;oid=128089324&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_CommonStockCapitalSharesReservedForFutureIssuance">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Aggregate number of common shares reserved for future issuance.</p></div>
<a href="javascript:void(0);" onclick="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 https://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (i)<br> -URI https://asc.fasb.org/extlink&amp;oid=128089324&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (i)<br> -URI https://asc.fasb.org/extlink&amp;oid=128089324&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (i)<br> -URI https://asc.fasb.org/extlink&amp;oid=128089324&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(2)(iii)(01)<br> -URI https://asc.fasb.org/extlink&amp;oid=128089324&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (a)(3)<br> -URI https://asc.fasb.org/extlink&amp;oid=128089324&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=128089324&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Number of non-vested options outstanding.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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>
</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_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (e)(2)<br> -URI https://asc.fasb.org/extlink&amp;oid=128089324&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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>
</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:durationItemType</td>
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<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>
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<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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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>
<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>
</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=OPTT_NonVestedStockMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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>
</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>
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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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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>
</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_AwardTypeAxis=us-gaap_RestrictedStockMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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>
</tr>
<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>
</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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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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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<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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<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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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=srt_ChiefExecutiveOfficerMember</td>
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<td></td>
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<td>na</td>
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<td></td>
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<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="Show.hideAR();">X</a></td></tr>
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<a href="javascript:void(0);" onclick="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_TwoThousandAndEighteenInducementPlanMember</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>na</td>
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<td><strong> Balance Type:</strong></td>
<td></td>
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<td><strong> Period Type:</strong></td>
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<span style="display: none;">v3.22.2.2</span><table class="report" border="0" cellspacing="2" id="idm140132825604464">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Fair Value Measurements (Details Narrative) - USD ($)<br> $ in Millions</strong></div></th>
<th class="th" colspan="1">3 Months Ended</th>
<th class="th" colspan="1"></th>
</tr>
<tr>
<th class="th"><div>Jul. 31, 2022</div></th>
<th class="th"><div>Apr. 30, 2022</div></th>
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<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems', window );"><strong>Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [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="nump">$ 42.7<span></span>
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<td class="nump">$ 49.4<span></span>
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<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member', window );">Fair Value, Inputs, Level 3 [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="Show.showAR( this, 'defref_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems', window );"><strong>Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<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="Show.showAR( this, 'defref_us-gaap_BusinessCombinationContingentConsiderationLiability', window );">Contingent liability MAR acquisition amount</a></td>
<td class="nump">1.5<span></span>
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<td class="text">&#160;<span></span>
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<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_OPTT_IncreaseDecreaseInContingentLiability', window );">Decrease in contingent liability</a></td>
<td class="nump">0.1<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="Show.showAR( this, 'defref_us-gaap_ContingentConsiderationClassifiedAsEquityFairValueDisclosure', window );">Fair value of contingent consideration</a></td>
<td class="nump">$ 1.6<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_IncreaseDecreaseInContingentLiability">
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<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>The increase (decrease) in contingent liability.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_IncreaseDecreaseInContingentLiability</td>
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</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_BusinessCombinationContingentConsiderationLiability">
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<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Amount of liability recognized arising from contingent consideration in a business combination.</p></div>
<a href="javascript:void(0);" onclick="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 (c)(1)<br> -URI https://asc.fasb.org/extlink&amp;oid=126975305&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 805<br> -SubTopic 30<br> -Section 35<br> -Paragraph 1<br> -Subparagraph (b)<br> -URI https://asc.fasb.org/extlink&amp;oid=126966325&amp;loc=d3e6819-128478<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 25<br> -Paragraph 6<br> -URI https://asc.fasb.org/extlink&amp;oid=6911189&amp;loc=d3e6408-128476<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_BusinessCombinationContingentConsiderationLiability</td>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ContingentConsiderationClassifiedAsEquityFairValueDisclosure">
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<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Fair value of contingent consideration in a business combination that is classified in shareholders' equity.</p></div>
<a href="javascript:void(0);" onclick="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 820<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (a)<br> -URI https://asc.fasb.org/extlink&amp;oid=126976982&amp;loc=d3e19207-110258<br></p></div>
<a href="javascript:void(0);" onclick="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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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems</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_InvestmentsFairValueDisclosure">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.</p></div>
<a href="javascript:void(0);" onclick="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> -Subparagraph (a)<br> -URI https://asc.fasb.org/extlink&amp;oid=126976982&amp;loc=d3e19207-110258<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_InvestmentsFairValueDisclosure</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:monetaryItemType</td>
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<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
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<td>instant</td>
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</table></div>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
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<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Details</a><div><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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<td></td>
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<td><strong> Period Type:</strong></td>
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<head>
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<span style="display: none;">v3.22.2.2</span><table class="report" border="0" cellspacing="2" id="idm140132831871296">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Commitments and Contingencies (Details Narrative) - Tax Authority, Spain [Member]<br></strong></div></th>
<th class="th">
<div>Jan. 25, 2021 </div>
<div>EUR (&#8364;)</div>
</th>
<th class="th">
<div>Jul. 31, 2022 </div>
<div>USD ($)</div>
</th>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_LossContingenciesLineItems', window );"><strong>Loss Contingencies [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_LossContingencyDamagesPaidValue', window );">Payment of tax on damages</a></td>
<td class="nump">&#8364; 279,870<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_IncomeStatementLocationAxis=us-gaap_SellingGeneralAndAdministrativeExpensesMember', window );">Selling, General and Administrative Expenses [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_LossContingenciesLineItems', window );"><strong>Loss Contingencies [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued', window );">Income tax penalties</a></td>
<td class="nump">&#8364; 279,870<span></span>
</td>
<td class="nump">$ 331,000<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_IncomeTaxExaminationPenaltiesAndInterestAccrued">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://asc.fasb.org/extlink&amp;oid=121826272&amp;loc=d3e32718-109319<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_IncomeTaxExaminationPenaltiesAndInterestAccrued</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>
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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>
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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_LossContingenciesLineItems">
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<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_LossContingenciesLineItems</td>
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<td>xbrli:stringItemType</td>
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<td>duration</td>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Amount of damages paid to the plaintiff in the legal matter.</p></div>
<a href="javascript:void(0);" onclick="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 450<br> -SubTopic 20<br> -Section 50<br> -Paragraph 1<br> -URI https://asc.fasb.org/extlink&amp;oid=121557415&amp;loc=d3e14326-108349<br><br>Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef<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 https://asc.fasb.org/extlink&amp;oid=121557415&amp;loc=d3e14557-108349<br><br>Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef<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 https://asc.fasb.org/extlink&amp;oid=121557415&amp;loc=d3e14435-108349<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ 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_LossContingencyDamagesPaidValue</td>
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<td>xbrli:monetaryItemType</td>
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<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_IncomeTaxAuthorityNameAxis=us-gaap_TaxAuthoritySpainMember</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>
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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>
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<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
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<title></title>
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<span style="display: none;">v3.22.2.2</span><table class="report" border="0" cellspacing="2" id="idm140132826484352">
<tr>
<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="1">1 Months Ended</th>
<th class="th" colspan="2">3 Months Ended</th>
<th class="th" colspan="1"></th>
</tr>
<tr>
<th class="th"><div>May 31, 2021</div></th>
<th class="th"><div>Jul. 31, 2022</div></th>
<th class="th"><div>Jul. 31, 2021</div></th>
<th class="th"><div>Apr. 30, 2021</div></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="Show.showAR( this, 'defref_us-gaap_OperatingLossCarryforwardsLineItems', window );"><strong>Operating Loss Carryforwards [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="Show.showAR( this, 'defref_OPTT_ProceedFromSaleOfLossCarryforwardsAndTaxCredits', window );">Proceed from sale of loss carryforwards and tax credits</a></td>
<td class="nump">$ 1,000<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">
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<td class="text">&#160;<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="num">$ (1,041)<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
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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>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_OperatingLossCarryforwardsLineItems', window );"><strong>Operating Loss Carryforwards [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">
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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="nump">$ 12,000<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_IncomeTaxExpenseBenefit', window );">Income tax benefit</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 0<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
</table>
<div style="display: none;">
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<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Amount received from sale of net operating loss carryforwards and other tax credits.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="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><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
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<tr>
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<tr>
<td><strong> Period Type:</strong></td>
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</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="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="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 https://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 https://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 https://asc.fasb.org/extlink&amp;oid=126901519&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 https://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 https://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 https://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 https://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 https://asc.fasb.org/extlink&amp;oid=124431687&amp;loc=d3e22658-107794<br></p></div>
<a href="javascript:void(0);" onclick="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="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>
<a href="javascript:void(0);" onclick="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 740<br> -SubTopic 10<br> -Section 50<br> -Paragraph 3<br> -Subparagraph (a)<br> -URI https://asc.fasb.org/extlink&amp;oid=121826272&amp;loc=d3e32559-109319<br></p></div>
<a href="javascript:void(0);" onclick="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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<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="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="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="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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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
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<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
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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">3 Months Ended</th>
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<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.</p></div>
<a href="javascript:void(0);" onclick="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 https://asc.fasb.org/extlink&amp;oid=126901519&amp;loc=d3e8672-108599<br></p></div>
<a href="javascript:void(0);" onclick="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="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
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    <us-gaap:BusinessDescriptionAndBasisOfPresentationTextBlock contextRef="From2022-05-01to2022-07-31">&lt;p id="xdx_806_eus-gaap--BusinessDescriptionAndBasisOfPresentationTextBlock_zwjjcXi76R6g" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;(1)
&lt;span id="xdx_82B_zQLSahbtkDE7"&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-top: 0pt; margin-bottom: 0pt; margin-left: 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)&lt;/i&gt;&lt;/b&gt;&lt;/span&gt; &lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;&lt;i&gt;Background&lt;/i&gt;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;



&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-indent: 0"&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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Ocean Power Technologies, Inc. (&#x201c;OPTI&#x201d;) was founded in 1984
in New Jersey, commenced business operations in 1994 and re-incorporated in Delaware in 2007. Ocean Power Technologies, Inc. acquired
3dent Technology, LLC (&#x201c;3Dent&#x201d;), in February 2021 and Marine Advanced Robotics, Inc. (&#x201c;MAR&#x201d;) in November 2021
which are now included as part of the OPTI. OPTI, along with its subsidiaries, (the &#x201c;Company&#x201d;) is a complete solutions provider,
controlling the design, manufacturing, sales, installation, operations and maintenance of its products and services. The Company&#x2019;s
solutions provide distributed offshore power and data 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 the Company&#x2019;s goal is to generate the majority of its revenues
from the sale or lease of its products and solutions, and sales of services to support business operations.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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)&lt;/i&gt;&lt;/b&gt;&lt;/span&gt; &lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;&lt;i&gt;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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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 8 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, 2022,
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-top: 0pt; margin-bottom: 0pt; margin-left: 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)&lt;/i&gt;&lt;/b&gt;&lt;/span&gt; &lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;&lt;i&gt;Liquidity&lt;/i&gt;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;



&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;For
the three months ended July 31, 2022, the Company incurred net losses of approximately $&lt;span id="xdx_90F_eus-gaap--NetIncomeLoss_iN_pn5n6_di_c20220501__20220731_zllaE0mWMFse" title="Net loss"&gt;5.9&lt;/span&gt;
million, used cash in operations of approximately $&lt;span id="xdx_90F_eus-gaap--NetCashProvidedByUsedInOperatingActivities_iN_pn5n6_di_c20220501__20220731_zWgehvsOgiYf" title="Cash in operations"&gt;5.1&lt;/span&gt;
million and has an accumulated deficit of approximately $&lt;span id="xdx_90D_eus-gaap--RetainedEarningsAccumulatedDeficit_iNI_pn5n6_di_c20220731_z1lZzigeENFe" title="Accumulated deficit"&gt;259.6&lt;/span&gt;
million. The Company has continued to make investments in ongoing product development efforts in anticipation of future growth, as
evidenced by its acquisition of MAR 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, 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. Management believes the
Company&#x2019;s current cash balance at July 31, 2022 of $&lt;span id="xdx_909_eus-gaap--Cash_iI_pn5n6_c20220731_zgq1svZKLed7" title="Cash"&gt;9.4&lt;/span&gt;
million and marketable securities balance of $&lt;span id="xdx_901_eus-gaap--ShortTermInvestments_iI_pn5n6_c20220731_zYUpjcQON6Ik" title="Short-term investments"&gt;42.7&lt;/span&gt;
million is sufficient to fund its planned expenditures through at least September 2023.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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 an At the Market Offering Agreement with AGP (the &#x201c;2020 ATM Facility&#x201d;), having
capacity up to $&lt;span id="xdx_907_eus-gaap--LineOfCreditFacilityMaximumBorrowingCapacity_iI_pn5n6_c20201120__us-gaap--TypeOfArrangementAxis__custom--TwoThousandTwentyATMFacilityMember__dei--LegalEntityAxis__custom--AGPAllianceGlobalPartnersMember_zlBwiVnAQbQi" title="Offering amount capacity"&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_90A_eus-gaap--ProceedsFromIssuanceOfCommonStock_pn5n6_c20201203__20201204__us-gaap--TypeOfArrangementAxis__custom--TwoThousandTwentyATMFacilityMember__dei--LegalEntityAxis__custom--AGPAllianceGlobalPartnersMember_zMPzA3r1WGB6" title="Proceeds from initial public offering"&gt;50.0&lt;/span&gt; million. From inception of the 2020 ATM Facility through July 31, 2021, the Company had sold
and issued an aggregate of &lt;span id="xdx_90C_eus-gaap--SaleOfStockNumberOfSharesIssuedInTransaction_c20201120__20210731__us-gaap--TypeOfArrangementAxis__custom--TwoThousandTwentyATMFacilityMember__dei--LegalEntityAxis__custom--AGPAllianceGlobalPartnersMember_zKRr4JJL81v1" 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_c20201120__20210731__us-gaap--TypeOfArrangementAxis__custom--TwoThousandTwentyATMFacilityMember__dei--LegalEntityAxis__custom--AGPAllianceGlobalPartnersMember_z5U6IZelsDI7" 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_c20210731__us-gaap--TypeOfArrangementAxis__custom--TwoThousandTwentyATMFacilityMember__dei--LegalEntityAxis__custom--AGPAllianceGlobalPartnersMember_zixF8yZtjF8k" 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_90C_ecustom--PaymentOfSalesCommission_pn5n6_c20201120__20210731__us-gaap--TypeOfArrangementAxis__custom--TwoThousandTwentyATMFacilityMember__dei--LegalEntityAxis__custom--AGPAllianceGlobalPartnersMember_zfuCnYo9XF2k" 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_90B_eus-gaap--ProceedsFromIssuanceOfCommonStock_pn5n6_c20220109__20220110__us-gaap--TypeOfArrangementAxis__custom--TwoThousandTwentyATMFacilityMember_zj9zIP5mH8A9"&gt;25.0&lt;/span&gt; million (or an aggregate of $&lt;span id="xdx_900_eus-gaap--SaleOfStockConsiderationReceivedPerTransaction_pn5n6_c20220109__20220110__us-gaap--TypeOfArrangementAxis__custom--TwoThousandTwentyATMFacilityMember_zhj5p8ukrZY5" title="Proceeds from issuance or sale of equity, net of issuance costs"&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-top: 0pt; margin-bottom: 0pt; text-align: center"&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; text-align: center; margin-top: 0pt; margin-bottom: 0pt"&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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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 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_900_ecustom--StockIssuedDuringPeriodValueIssuedForCommitmentFee_c20200914__20200918__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_pn5n6" 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_90A_ecustom--PercentageOfOutstandingCommonStockLimitForShareholderApproval_pid_c20200914__20200918__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_ztKAHqxE0y91" 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 &lt;span id="xdx_90F_ecustom--PercentageOfOutstandingCommonStockLimitForShareholderApproval_pid_c20200914__20200918__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_zPa8PIyPSq39" title="Percentage of outstanding common stock"&gt;19.99%&lt;/span&gt; limit was &lt;span id="xdx_90C_ecustom--StockIssuedDuringPeriodSharesCanBeIssuedBasedUponOutstandingPercentage_pid_c20200914__20200918__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_zluDrNHL1co7" 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_906_ecustom--NumberOfAdditionalSharesThatCanBeIssuedUponShareholderApproval_pid_c20201222__20201223__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_zr5rnf3WR5Sg" title="Additional sales of common stock shares sold"&gt;9,864,706&lt;/span&gt; additional shares of common stock which exceeds the &lt;span id="xdx_901_ecustom--PercentageOfOutstandingCommonStockLimitForShareholderApproval_pid_c20201222__20201223__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_zSoDmSyj3Za7" 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 July 31, 2022, the Company had sold an aggregate of &lt;span id="xdx_90D_eus-gaap--SaleOfStockNumberOfSharesIssuedInTransaction_c20220501__20220731__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_zZ0vNTGG2Enh" 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_90C_eus-gaap--SaleOfStockConsiderationReceivedPerTransaction_pn5n6_c20220501__20220731__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_zrVcGjMij673" 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_908_eus-gaap--SaleOfStockPricePerShare_iI_c20220731__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_zEl1EohcoVla" 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_ecustom--SaleOfStockConsiderationReceivedPerTransactionRemaining_pn5n6_c20220501__20220731__us-gaap--TypeOfArrangementAxis__custom--StockPurchaseAgreementMember__dei--LegalEntityAxis__custom--AspireCapitalFundLLCMember_zvGYHaQByGIj" 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 July 31, 2022.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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
      contextRef="From2022-05-01to2022-07-31"
      decimals="-5"
      unitRef="USD">-5900000</us-gaap:NetIncomeLoss>
    <us-gaap:NetCashProvidedByUsedInOperatingActivities
      contextRef="From2022-05-01to2022-07-31"
      decimals="-5"
      unitRef="USD">-5100000</us-gaap:NetCashProvidedByUsedInOperatingActivities>
    <us-gaap:RetainedEarningsAccumulatedDeficit contextRef="AsOf2022-07-31" decimals="-5" unitRef="USD">-259600000</us-gaap:RetainedEarningsAccumulatedDeficit>
    <us-gaap:Cash contextRef="AsOf2022-07-31" decimals="-5" unitRef="USD">9400000</us-gaap:Cash>
    <us-gaap:ShortTermInvestments contextRef="AsOf2022-07-31" decimals="-5" unitRef="USD">42700000</us-gaap:ShortTermInvestments>
    <us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity
      contextRef="AsOf2020-11-20_custom_TwoThousandTwentyATMFacilityMember_custom_AGPAllianceGlobalPartnersMember"
      decimals="-5"
      unitRef="USD">100000000.0</us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity>
    <us-gaap:ProceedsFromIssuanceOfCommonStock
      contextRef="From2020-12-032020-12-04_custom_TwoThousandTwentyATMFacilityMember_custom_AGPAllianceGlobalPartnersMember"
      decimals="-5"
      unitRef="USD">50000000.0</us-gaap:ProceedsFromIssuanceOfCommonStock>
    <us-gaap:SaleOfStockNumberOfSharesIssuedInTransaction
      contextRef="From2020-11-202021-07-31_custom_TwoThousandTwentyATMFacilityMember_custom_AGPAllianceGlobalPartnersMember"
      decimals="INF"
      unitRef="Shares">17179883</us-gaap:SaleOfStockNumberOfSharesIssuedInTransaction>
    <us-gaap:SaleOfStockConsiderationReceivedPerTransaction
      contextRef="From2020-11-202021-07-31_custom_TwoThousandTwentyATMFacilityMember_custom_AGPAllianceGlobalPartnersMember"
      decimals="-5"
      unitRef="USD">50000000.0</us-gaap:SaleOfStockConsiderationReceivedPerTransaction>
    <us-gaap:SaleOfStockPricePerShare
      contextRef="AsOf2021-07-31_custom_TwoThousandTwentyATMFacilityMember_custom_AGPAllianceGlobalPartnersMember"
      decimals="INF"
      unitRef="USDPShares">2.91</us-gaap:SaleOfStockPricePerShare>
    <OPTT:PaymentOfSalesCommission
      contextRef="From2020-11-202021-07-31_custom_TwoThousandTwentyATMFacilityMember_custom_AGPAllianceGlobalPartnersMember"
      decimals="-5"
      unitRef="USD">1600000</OPTT:PaymentOfSalesCommission>
    <us-gaap:ProceedsFromIssuanceOfCommonStock
      contextRef="From2022-01-092022-01-10_custom_TwoThousandTwentyATMFacilityMember"
      decimals="-5"
      unitRef="USD">25000000.0</us-gaap:ProceedsFromIssuanceOfCommonStock>
    <us-gaap:SaleOfStockConsiderationReceivedPerTransaction
      contextRef="From2022-01-092022-01-10_custom_TwoThousandTwentyATMFacilityMember"
      decimals="-5"
      unitRef="USD">75000000.0</us-gaap:SaleOfStockConsiderationReceivedPerTransaction>
    <OPTT:StockIssuedDuringPeriodValueIssuedForCommitmentFee
      contextRef="From2020-09-142020-09-18_custom_StockPurchaseAgreementMember_custom_AspireCapitalFundLLCMember"
      decimals="-5"
      unitRef="USD">12500000</OPTT:StockIssuedDuringPeriodValueIssuedForCommitmentFee>
    <OPTT:PercentageOfOutstandingCommonStockLimitForShareholderApproval
      contextRef="From2020-09-142020-09-18_custom_StockPurchaseAgreementMember_custom_AspireCapitalFundLLCMember"
      decimals="INF"
      unitRef="Pure">0.1999</OPTT:PercentageOfOutstandingCommonStockLimitForShareholderApproval>
    <OPTT:PercentageOfOutstandingCommonStockLimitForShareholderApproval
      contextRef="From2020-09-142020-09-18_custom_StockPurchaseAgreementMember_custom_AspireCapitalFundLLCMember"
      decimals="INF"
      unitRef="Pure">0.1999</OPTT:PercentageOfOutstandingCommonStockLimitForShareholderApproval>
    <OPTT:StockIssuedDuringPeriodSharesCanBeIssuedBasedUponOutstandingPercentage
      contextRef="From2020-09-142020-09-18_custom_StockPurchaseAgreementMember_custom_AspireCapitalFundLLCMember"
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      unitRef="Shares">3722251</OPTT:StockIssuedDuringPeriodSharesCanBeIssuedBasedUponOutstandingPercentage>
    <OPTT:NumberOfAdditionalSharesThatCanBeIssuedUponShareholderApproval
      contextRef="From2020-12-222020-12-23_custom_StockPurchaseAgreementMember_custom_AspireCapitalFundLLCMember"
      decimals="INF"
      unitRef="Shares">9864706</OPTT:NumberOfAdditionalSharesThatCanBeIssuedUponShareholderApproval>
    <OPTT:PercentageOfOutstandingCommonStockLimitForShareholderApproval
      contextRef="From2020-12-222020-12-23_custom_StockPurchaseAgreementMember_custom_AspireCapitalFundLLCMember"
      decimals="INF"
      unitRef="Pure">0.1999</OPTT:PercentageOfOutstandingCommonStockLimitForShareholderApproval>
    <us-gaap:SaleOfStockNumberOfSharesIssuedInTransaction
      contextRef="From2022-05-012022-07-31_custom_StockPurchaseAgreementMember_custom_AspireCapitalFundLLCMember"
      decimals="INF"
      unitRef="Shares">3722251</us-gaap:SaleOfStockNumberOfSharesIssuedInTransaction>
    <us-gaap:SaleOfStockConsiderationReceivedPerTransaction
      contextRef="From2022-05-012022-07-31_custom_StockPurchaseAgreementMember_custom_AspireCapitalFundLLCMember"
      decimals="-5"
      unitRef="USD">11800000</us-gaap:SaleOfStockConsiderationReceivedPerTransaction>
    <us-gaap:SaleOfStockPricePerShare
      contextRef="AsOf2022-07-31_custom_StockPurchaseAgreementMember_custom_AspireCapitalFundLLCMember"
      decimals="INF"
      unitRef="USDPShares">3.17</us-gaap:SaleOfStockPricePerShare>
    <OPTT:SaleOfStockConsiderationReceivedPerTransactionRemaining
      contextRef="From2022-05-012022-07-31_custom_StockPurchaseAgreementMember_custom_AspireCapitalFundLLCMember"
      decimals="-5"
      unitRef="USD">1000000.0</OPTT:SaleOfStockConsiderationReceivedPerTransactionRemaining>
    <us-gaap:SignificantAccountingPoliciesTextBlock contextRef="From2022-05-01to2022-07-31">&lt;p id="xdx_802_eus-gaap--SignificantAccountingPoliciesTextBlock_zUcK4VwVpzTi" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;(2)
&lt;span id="xdx_82A_zBU4H5rCVvF4"&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-top: 0pt; margin-bottom: 0pt; margin-left: 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_84D_eus-gaap--ConsolidationPolicyTextBlock_zy0U9TtxwgZ6" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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_862_zOOXfzGk1VWc"&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-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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, Ocean Power Technologies
Ltd. in the United Kingdom, and Ocean Power Technologies (Australasia) Pty Ltd. in Australia (&#x201c;OPT-A&#x201d;). OPT-A is in the process
of being liquidated. All documents have been filed with the Australian Tax Organization and the Company expects this to be completed
in the second quarter of the current fiscal year. All significant intercompany accounts and transactions have been eliminated in consolidation.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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_844_eus-gaap--UseOfEstimates_zg0FcSINI2wa" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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_86E_zliy00geaJul"&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-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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, stock-based
compensation, 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 hours and costs
to complete projects 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-top: 0pt; margin-bottom: 0pt; margin-left: 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--CashAndCashEquivalentsRestrictedCashAndCashEquivalentsPolicy_zaxnFNkuk5ba" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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_86C_zoAE1d1Nc6Wf"&gt;Cash, Cash Equivalents, Restricted, Security Agreements and Marketable Securities&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-top: 0pt; margin-bottom: 0pt; margin-left: 0"&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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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 or in marketable securities. The following table summarizes cash and cash equivalents
as of July 31, 2022 and April 30, 2022:&lt;/span&gt;&lt;/p&gt;

&lt;p id="xdx_899_eus-gaap--ScheduleOfCashAndCashEquivalentsTableTextBlock_z2mEzmhIBMT7" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span id="xdx_8B4_zeno9R6Dqtwd" 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="vertical-align: bottom"&gt;
    &lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;July 31, 2022&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;April 30, 2022&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td colspan="6" style="text-align: center"&gt;(in thousands)&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2"&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2"&gt;&#160;&lt;/td&gt;&lt;td&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: 60%; text-align: left"&gt;Checking and savings accounts&lt;/td&gt;&lt;td style="width: 2%"&gt;&#160;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;$&lt;/td&gt;&lt;td id="xdx_98A_eus-gaap--CashAndCashEquivalentsAtCarryingValue_iI_pn3n3_c20220731__us-gaap--CashAndCashEquivalentsAxis__custom--CheckingAndSavingsAccountsMember_zgvAdKuStM47" style="width: 16%; text-align: right" title="Cash and cash equivalents"&gt;2,029&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="width: 2%"&gt;&#160;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;$&lt;/td&gt;&lt;td id="xdx_98A_eus-gaap--CashAndCashEquivalentsAtCarryingValue_iI_pn3n3_c20220430__us-gaap--CashAndCashEquivalentsAxis__custom--CheckingAndSavingsAccountsMember_zhIqmUCtNui9" style="width: 16%; text-align: right" title="Cash and cash equivalents"&gt;1,815&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; padding-bottom: 1.5pt"&gt;Money market account&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td id="xdx_982_eus-gaap--CashAndCashEquivalentsAtCarryingValue_iI_pn3n3_c20220731__us-gaap--CashAndCashEquivalentsAxis__us-gaap--MoneyMarketFundsMember_zxC9aaEj0T74" style="border-bottom: Black 1.5pt solid; text-align: right" title="Cash and cash equivalents"&gt;7,147&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td id="xdx_980_eus-gaap--CashAndCashEquivalentsAtCarryingValue_iI_pn3n3_c20220430__us-gaap--CashAndCashEquivalentsAxis__us-gaap--MoneyMarketFundsMember_zfhRJOMZL0Kf" style="border-bottom: Black 1.5pt solid; text-align: right" title="Cash and cash equivalents"&gt;6,070&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; 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"&gt;&#160;&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;$&lt;/td&gt;&lt;td id="xdx_985_eus-gaap--CashAndCashEquivalentsAtCarryingValue_iI_pn3n3_c20220731_zk7z4N27ervh" style="border-bottom: Black 2.5pt double; text-align: right" title="Cash and cash equivalents"&gt;9,176&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;$&lt;/td&gt;&lt;td id="xdx_98E_eus-gaap--CashAndCashEquivalentsAtCarryingValue_iI_pn3n3_c20220430_zlkkwhY2mE2i" style="border-bottom: Black 2.5pt double; text-align: right" title="Cash and cash equivalents"&gt;7,885&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_8AE_zpOVZJDTs09h" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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_906_eus-gaap--Deposits_iI_c20220731__us-gaap--TypeOfArrangementAxis__custom--RestrictedCashAndSecurityAgreementsMember__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--SantanderBankMember__us-gaap--ShortTermDebtTypeAxis__us-gaap--LetterOfCreditMember_zmjus2Yp2fMc" title="Deposits"&gt;154,000&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 the bank.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"&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; text-align: center; margin-top: 0pt; margin-bottom: 0pt"&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; margin-left: 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Santander
also issued a letter of credit to subsidiaries of Enel Green Power (&#x201c;EGP&#x201d;) pursuant to the Company&#x2019;s contracts with
EGP. This letter of credit was originally issued in the amount of $&lt;span id="xdx_904_eus-gaap--LettersOfCreditOutstandingAmount_iI_c20200831__us-gaap--TypeOfArrangementAxis__custom--RestrictedCashAndSecurityAgreementsMember__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--SantanderBankMember__us-gaap--ShortTermDebtTypeAxis__custom--LetterOneMember_zITRrjl16il7" title="Letters of credit outstanding, Amount"&gt;645,000&lt;/span&gt; and was reduced to $&lt;span id="xdx_908_eus-gaap--LettersOfCreditOutstandingAmount_iI_pp0p0_c20200831__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--SantanderBankMember__us-gaap--ShortTermDebtTypeAxis__custom--LetterTwoMember__us-gaap--AwardDateAxis__custom--AugustTwentyTwentyMember_zPryBf3RlNqg"&gt;323,000&lt;/span&gt; in August 2020. The letter of
credit will be reduced by an additional $&lt;span id="xdx_909_ecustom--LettersOfCreditIssuedAmount_iI_pp0p0_c20220731__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--SantanderBankMember__us-gaap--ShortTermDebtTypeAxis__custom--LetterTwoMember_zfWIdANCv4H7"&gt;258,000&lt;/span&gt; once the PowerBuoy&#xae; (&#x201c;PB3&#x201d;) and its accompanying systems pass final
acceptance testing. The remaining restricted amount of $&lt;span id="xdx_90F_ecustom--LettersOfCreditIssuedAmount_iI_c20220731__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--SantanderBankMember_zEt4FZkuNJFk" title="Letters of credit issued amount"&gt;65,000&lt;/span&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-top: 0pt; margin-bottom: 0pt; margin-left: 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_894_eus-gaap--ScheduleOfRestrictedCashAndCashEquivalentsTextBlock_zK4GorEL60m1" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span id="xdx_8BD_zxublpbXDUyi" 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="display: none; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left"&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 id="xdx_493_20220731_zh4GFdLidXm8" style="text-align: right"&gt;&#160;&lt;/td&gt;&lt;td style="text-align: left"&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 id="xdx_496_20220430" 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"&gt;
    &lt;td&gt;&#160;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;July 31, 2022&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&#160;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;April 30, 2022&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td colspan="6" style="text-align: center"&gt;(in thousands)&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40E_eus-gaap--CashAndCashEquivalentsAtCarryingValue_iI_pn3n3" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="width: 60%; text-align: left"&gt;Cash and cash equivalents&lt;/td&gt;&lt;td style="width: 2%"&gt;&#160;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;$&lt;/td&gt;&lt;td style="width: 16%; text-align: right"&gt;9,176&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="width: 2%"&gt;&#160;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;$&lt;/td&gt;&lt;td style="width: 16%; text-align: right"&gt;7,885&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_401_eus-gaap--RestrictedCashCurrent_iI_pn3n3" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left"&gt;Restricted cash- short term&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;258&lt;/td&gt;&lt;td style="text-align: left"&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;258&lt;/td&gt;&lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40F_eus-gaap--RestrictedCashNoncurrent_iI_pn3n3" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left; padding-bottom: 1.5pt"&gt;Restricted cash- long term&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; text-align: right"&gt;219&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; text-align: right"&gt;219&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40B_eus-gaap--CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_iI_pn3n3_zPoAY8k6bTKg" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="display: none; font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Cash, cash equivalents,
    restricted cash and restricted cash equivalents&lt;/span&gt;&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;$&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; text-align: right"&gt;9,653&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;$&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; text-align: right"&gt;8,362&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_8AF_zb501wK86kH2" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"&gt;&lt;i&gt;Marketable
Securities&lt;/i&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;During
fiscal 2022, the Company acquired investment securities through Charles Schwab Bank. As of July 31, 2022 and April 30, 2022, their
value was approximately $&lt;span id="xdx_90B_eus-gaap--AlternativeInvestment_iI_pn5n6_c20220731_zK7gerDVwuha" title="Investment securities"&gt;42.7&lt;/span&gt;
million and $&lt;span id="xdx_901_eus-gaap--AlternativeInvestment_iI_pn5n6_c20220430_zvnTCS0Curmf"&gt;49.4&lt;/span&gt; million, respectively.
All marketable securities consist of corporate bonds, government agency bonds, or U.S. Treasury Notes and Bonds, are investment
grade rated or better, and mature within 12 months. The Company has the means and intends to hold all investments to maturity, and
as such are classified as held-to-maturity investments and carried at amortized cost. The total recognized interest expense on the
premium we paid for the securities as of July 31, 2022 and 2021 is approximately &lt;span&gt;$&lt;span id="xdx_903_eus-gaap--InvestmentIncomeNetAmortizationOfDiscountAndPremium_pn5n6_c20220501__20220731_z8CzZCnSUQcd" title="Discount and premium"&gt;0.1&lt;/span&gt;
million and &lt;span id="xdx_908_eus-gaap--InvestmentIncomeNetAmortizationOfDiscountAndPremium_dc_c20210501__20210731_zdPYMZcgV65l"&gt;zero&lt;/span&gt;&lt;/span&gt;,
respectively, on an amortized cost basis of approximately $&lt;span id="xdx_907_eus-gaap--TradingSecuritiesDebtAmortizedCost_iI_pn5n6_c20220731_zPQbCWbzjE0i" title="Investment owned at cost"&gt;0.3&lt;/span&gt;
million and &lt;span id="xdx_90E_eus-gaap--TradingSecuritiesDebtAmortizedCost_iI_dc_c20210731_zkobbCmIcW3"&gt;zero&lt;/span&gt;, respectively.
Additionally, there has been no impairment on these investments.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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_89C_eus-gaap--UnrealizedGainLossOnInvestmentsTableTextBlock_zy0USolL0Yg8" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;The
following table summarizes the Company&#x2019;s marketable securities as of July 31, 2022:&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"&gt;&#160;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span id="xdx_8B5_z9L3fZ3W0lYc" style="display: none"&gt;Schedule of Investments and Unrealized Gains/Losses&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="border-bottom: Black 1.5pt solid; font-weight: bold"&gt;Category (in thousands)&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;Market Value&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;Unrealized &lt;br/&gt;
Gains (Losses)&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;Adjusted Cost&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&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: 40%; text-align: left"&gt;Corporate Bonds&lt;/td&gt;&lt;td style="width: 2%"&gt;&#160;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;$&lt;/td&gt;&lt;td id="xdx_983_eus-gaap--MoneyMarketFundsAtCarryingValue_iI_pn3n3_c20220731__us-gaap--InvestmentTypeAxis__custom--CorporateBondsMember_zbVEsGcwCJ3e" style="width: 16%; text-align: right"&gt;31,853&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="width: 2%"&gt;&#160;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;$&lt;/td&gt;&lt;td id="xdx_989_eus-gaap--UnrealizedGainLossOnInvestments_pn3n3_c20220501__20220731__us-gaap--InvestmentTypeAxis__custom--CorporateBondsMember_zMPadx01Tevd" style="width: 16%; text-align: right" title="Unrealized Gains (Losses)"&gt;151&lt;/td&gt;&lt;td style="width: 1%; text-align: left"/&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_98D_eus-gaap--InvestmentOwnedAtCost_iI_pn3n3_c20220731__us-gaap--InvestmentTypeAxis__custom--CorporateBondsMember_ztHmMv2Rflw8" style="width: 16%; text-align: right" title="Total Cost"&gt;32,004&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;Government Bonds &amp;amp; Notes&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_987_eus-gaap--MoneyMarketFundsAtCarryingValue_iI_pn3n3_c20220731__us-gaap--InvestmentTypeAxis__custom--GovernmentBondsandNotesMember_zfwFI7aojBy7" style="text-align: right"&gt;7,986&lt;/td&gt;&lt;td style="text-align: left"&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 id="xdx_984_eus-gaap--UnrealizedGainLossOnInvestments_pn3n3_c20220501__20220731__us-gaap--InvestmentTypeAxis__custom--GovernmentBondsandNotesMember_z5g7p8zQmrRh" style="text-align: right"&gt;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0"&gt;15&lt;/p&gt;&lt;/td&gt;&lt;td style="text-align: left"/&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;td id="xdx_989_eus-gaap--InvestmentOwnedAtCost_iI_pn3n3_c20220731__us-gaap--InvestmentTypeAxis__custom--GovernmentBondsandNotesMember_zF5pwijoQtUi" style="text-align: right"&gt;8,001&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;Government Agency&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_98E_eus-gaap--MoneyMarketFundsAtCarryingValue_iI_pn3n3_c20220731__us-gaap--InvestmentTypeAxis__custom--GovernmentAgencyMember_zWw5N1mEYX6h" style="text-align: right"&gt;2,498&lt;/td&gt;&lt;td style="text-align: left"&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 id="xdx_989_eus-gaap--UnrealizedGainLossOnInvestments_pn3n3_c20220501__20220731__us-gaap--InvestmentTypeAxis__custom--GovernmentAgencyMember_zeDcORknoR4l" style="text-align: right"&gt;11&lt;/td&gt;&lt;td style="text-align: left"/&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;td id="xdx_98B_eus-gaap--InvestmentOwnedAtCost_iI_pn3n3_c20220731__us-gaap--InvestmentTypeAxis__custom--GovernmentAgencyMember_zO4lZrYtZWm9" style="text-align: right"&gt;2,509&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: 1.5pt; text-align: left"&gt;Accrued Interest&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td id="xdx_987_eus-gaap--MoneyMarketFundsAtCarryingValue_iI_pn3n3_c20220731__us-gaap--InvestmentTypeAxis__custom--AccuredInterestMember_z47q2mQiLDw" style="border-bottom: Black 1.5pt solid; text-align: right"&gt;311&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td id="xdx_982_eus-gaap--UnrealizedGainLossOnInvestments_pn3n3_c20220501__20220731__us-gaap--InvestmentTypeAxis__custom--AccuredInterestMember_zT3RaadU94yi" style="border-bottom: Black 1.5pt solid; text-align: right"&gt;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0"&gt;(101&lt;/p&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;)&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td id="xdx_987_eus-gaap--InvestmentOwnedAtCost_iI_pn3n3_c20220731__us-gaap--InvestmentTypeAxis__custom--AccuredInterestMember_zdvAi8j3uMvc" style="border-bottom: Black 1.5pt solid; text-align: right"&gt;210&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; 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; padding-bottom: 2.5pt"&gt;Total Marketable Securities&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_98C_eus-gaap--MoneyMarketFundsAtCarryingValue_iI_pn3n3_c20220731_zakQom9mo99e" style="border-bottom: Black 2.5pt double; text-align: right" title="Market Value"&gt;42,648&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&#160;&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;$&lt;/td&gt;&lt;td id="xdx_98F_eus-gaap--UnrealizedGainLossOnInvestments_pn3n3_c20220501__20220731_zETDZCRAGEye" style="border-bottom: Black 2.5pt double; text-align: right" title="Unrealized Gains (Losses)"&gt;(76&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;)&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;$&lt;/td&gt;&lt;td id="xdx_986_eus-gaap--InvestmentOwnedAtCost_iI_pn3n3_c20220731_zV6uJbdPQM6i" style="border-bottom: Black 2.5pt double; text-align: right" title="Total Cost"&gt;42,724&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_8A0_z93hOAE3fV8j" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0"&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 id="xdx_843_eus-gaap--ConcentrationRiskCreditRisk_zhyngZhx0eec" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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_86A_zd4lzaSIJqL5"&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-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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 trade accounts receivable, marketable securities
and cash. The Company believes that its credit risk is limited because the Company&#x2019;s current contracts are with companies with
a reliable payment history. The Company invests its excess cash in a money market fund and short term held-to maturity investment and
does not believe that it is exposed to any significant risks related to its cash accounts, money market fund, or held-to maturity investments.
Cash is also maintained at foreign financial institutions. Cash in foreign financial institutions as of July 31, 2022 was approximately
$&lt;span id="xdx_901_eus-gaap--CashAndCashEquivalentsAtCarryingValue_iI_c20220731__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--ForeignFinancialInstitutionsMember_zSrmd6XLlCah" title="Cash and cash equivalents"&gt;24,000&lt;/span&gt;.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"&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; text-align: center; margin-top: 0pt; margin-bottom: 0pt"&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; margin-left: 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;For the three months ended July 31, 2022 and 2021, the Company had three
and two customers whose revenues accounted for at least 10% of the Company&#x2019;s consolidated revenues, respectively. These revenue
accounted for approximately &lt;span id="xdx_90A_eus-gaap--ConcentrationRiskPercentage1_pid_dp_uPure_c20220501__20220731__us-gaap--ConcentrationRiskByBenchmarkAxis__us-gaap--SalesRevenueNetMember__us-gaap--ConcentrationRiskByTypeAxis__us-gaap--CustomerConcentrationRiskMember__srt--MajorCustomersAxis__custom--ThreeAndTwoCustomersMember_zZULkty2L83i" title="Concentration risk percentage"&gt;69%&lt;/span&gt; and &lt;span id="xdx_90E_eus-gaap--ConcentrationRiskPercentage1_pid_dp_uPure_c20210501__20210731__us-gaap--ConcentrationRiskByBenchmarkAxis__us-gaap--SalesRevenueNetMember__us-gaap--ConcentrationRiskByTypeAxis__us-gaap--CustomerConcentrationRiskMember__srt--MajorCustomersAxis__custom--ThreeAndTwoCustomersMember_zWyNdRNlwj2d" title="Concentration risk percentage"&gt;88%&lt;/span&gt; of the Company&#x2019;s total revenue for the respective periods.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span/&gt;&lt;/span&gt;&lt;/p&gt;


&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0"&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 id="xdx_844_eus-gaap--ShareBasedCompensationOptionAndIncentivePlansPolicy_zOFgg3OGWX34" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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_861_zuRz3CqFkZa6"&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-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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
aggregate share-based compensation expense recorded in the Consolidated Statements of Operations for the three months ended July 31,
2022 and 2021 was approximately $&lt;span id="xdx_904_eus-gaap--EmployeeBenefitsAndShareBasedCompensation_pn5n6_c20220501__20220731_zYP0Yjn2N4De" title="Share based compensation"&gt;0.3&lt;/span&gt; million and $&lt;span id="xdx_90C_eus-gaap--EmployeeBenefitsAndShareBasedCompensation_pn5n6_c20210501__20210731_zcJcrwZiD7m3" title="Share based compensation"&gt;0.4&lt;/span&gt; million, respectively.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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_84C_eus-gaap--RevenueFromContractWithCustomerPolicyTextBlock_zmUPHVYHhezi" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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_867_zjoHurDamM4d"&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-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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 July 31, 2022 and 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 in costs of goods sold, and regular shipping and handling activities charged to operating
expenses.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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 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 labor hours 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-top: 0pt; margin-bottom: 0pt; text-align: center"&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; text-align: center; margin-top: 0pt; margin-bottom: 0pt"&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; margin-left: 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, fixed-price contracts, time and material agreements, or lease agreements. 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-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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 three-month periods ended July 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-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Time
and materials agreements are billed based solely on the cost of time spent working on the contract and the material used.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;As
of July 31, 2022, the Company&#x2019;s total remaining performance obligations, also referred to as backlog, totaled $&lt;span id="xdx_902_eus-gaap--RevenueRemainingPerformanceObligation_iI_pn5n6_c20220731_zKAvsRrnxtCe" title="Revenue remaining performance obligation"&gt;0.3&lt;/span&gt; million. The
Company expects to recognize &lt;span id="xdx_90E_ecustom--RevenueRemainingPerformancesObligationPercentage_pid_dp_uPure_c20220501__20220731_zTXiNH9SEdVg" title="Revenue remaining performance obligation, percentage"&gt;100&lt;/span&gt;%, or $&lt;span id="xdx_907_eus-gaap--RevenueRemainingPerformanceObligation_iI_pn5n6_c20220731_zZI2Z4Rjj0u" title="Revenue remaining performance obligation"&gt;0.3&lt;/span&gt; million, 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-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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&#xae;&#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-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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 others are treated as operating leases.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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 Statement of Operations.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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_84F_eus-gaap--EarningsPerSharePolicyTextBlock_znJF9QQGkLy5" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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;(g)
&lt;span id="xdx_866_zf9WVT2MM7E9"&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-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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 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 period. 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 the basic earnings per share number. Due
to the Company&#x2019;s net losses, potentially dilutive securities, consisting of options to purchase shares of common stock, potential
exercises of warrants on common stock and unvested restricted stock issued to employees and non-employee directors, were excluded from
the diluted loss per 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-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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 share on the Consolidated Statement of Operations, potential exercises of warrants on 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_pid_c20220501__20220731_zlWXvMhyVAb1" title="Antidilutive securities earnings per share"&gt;6,378,218&lt;/span&gt;
and &lt;span id="xdx_90C_eus-gaap--AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_pid_c20210501__20210731_zG7Kn0DuRnTa"&gt;5,243,647&lt;/span&gt; for the three months ended July 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-top: 0pt; margin-bottom: 0pt; margin-left: 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--NewAccountingPronouncementsPolicyPolicyTextBlock_zLTdh0sXipBf" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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_861_zCViT2nSy448"&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-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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 the adoption of ASU 2016-13 will have on its consolidated financial statements.&lt;/span&gt;&lt;/p&gt;

&lt;p id="xdx_852_zPAI04rnbet5" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"&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; text-align: center; margin-top: 0pt; margin-bottom: 0pt"&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:SignificantAccountingPoliciesTextBlock>
    <us-gaap:ConsolidationPolicyTextBlock contextRef="From2022-05-01to2022-07-31">&lt;p id="xdx_84D_eus-gaap--ConsolidationPolicyTextBlock_zy0U9TtxwgZ6" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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_862_zOOXfzGk1VWc"&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-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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, Ocean Power Technologies
Ltd. in the United Kingdom, and Ocean Power Technologies (Australasia) Pty Ltd. in Australia (&#x201c;OPT-A&#x201d;). OPT-A is in the process
of being liquidated. All documents have been filed with the Australian Tax Organization and the Company expects this to be completed
in the second quarter of the current fiscal year. All significant intercompany accounts and transactions have been eliminated in consolidation.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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="From2022-05-01to2022-07-31">&lt;p id="xdx_844_eus-gaap--UseOfEstimates_zg0FcSINI2wa" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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_86E_zliy00geaJul"&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-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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, stock-based
compensation, 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 hours and costs
to complete projects 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-top: 0pt; margin-bottom: 0pt; margin-left: 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="From2022-05-01to2022-07-31">&lt;p id="xdx_84E_eus-gaap--CashAndCashEquivalentsRestrictedCashAndCashEquivalentsPolicy_zaxnFNkuk5ba" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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_86C_zoAE1d1Nc6Wf"&gt;Cash, Cash Equivalents, Restricted, Security Agreements and Marketable Securities&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-top: 0pt; margin-bottom: 0pt; margin-left: 0"&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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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 or in marketable securities. The following table summarizes cash and cash equivalents
as of July 31, 2022 and April 30, 2022:&lt;/span&gt;&lt;/p&gt;

&lt;p id="xdx_899_eus-gaap--ScheduleOfCashAndCashEquivalentsTableTextBlock_z2mEzmhIBMT7" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span id="xdx_8B4_zeno9R6Dqtwd" 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="vertical-align: bottom"&gt;
    &lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;July 31, 2022&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;April 30, 2022&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td colspan="6" style="text-align: center"&gt;(in thousands)&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2"&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2"&gt;&#160;&lt;/td&gt;&lt;td&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: 60%; text-align: left"&gt;Checking and savings accounts&lt;/td&gt;&lt;td style="width: 2%"&gt;&#160;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;$&lt;/td&gt;&lt;td id="xdx_98A_eus-gaap--CashAndCashEquivalentsAtCarryingValue_iI_pn3n3_c20220731__us-gaap--CashAndCashEquivalentsAxis__custom--CheckingAndSavingsAccountsMember_zgvAdKuStM47" style="width: 16%; text-align: right" title="Cash and cash equivalents"&gt;2,029&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="width: 2%"&gt;&#160;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;$&lt;/td&gt;&lt;td id="xdx_98A_eus-gaap--CashAndCashEquivalentsAtCarryingValue_iI_pn3n3_c20220430__us-gaap--CashAndCashEquivalentsAxis__custom--CheckingAndSavingsAccountsMember_zhIqmUCtNui9" style="width: 16%; text-align: right" title="Cash and cash equivalents"&gt;1,815&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; padding-bottom: 1.5pt"&gt;Money market account&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td id="xdx_982_eus-gaap--CashAndCashEquivalentsAtCarryingValue_iI_pn3n3_c20220731__us-gaap--CashAndCashEquivalentsAxis__us-gaap--MoneyMarketFundsMember_zxC9aaEj0T74" style="border-bottom: Black 1.5pt solid; text-align: right" title="Cash and cash equivalents"&gt;7,147&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td id="xdx_980_eus-gaap--CashAndCashEquivalentsAtCarryingValue_iI_pn3n3_c20220430__us-gaap--CashAndCashEquivalentsAxis__us-gaap--MoneyMarketFundsMember_zfhRJOMZL0Kf" style="border-bottom: Black 1.5pt solid; text-align: right" title="Cash and cash equivalents"&gt;6,070&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; 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"&gt;&#160;&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;$&lt;/td&gt;&lt;td id="xdx_985_eus-gaap--CashAndCashEquivalentsAtCarryingValue_iI_pn3n3_c20220731_zk7z4N27ervh" style="border-bottom: Black 2.5pt double; text-align: right" title="Cash and cash equivalents"&gt;9,176&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;$&lt;/td&gt;&lt;td id="xdx_98E_eus-gaap--CashAndCashEquivalentsAtCarryingValue_iI_pn3n3_c20220430_zlkkwhY2mE2i" style="border-bottom: Black 2.5pt double; text-align: right" title="Cash and cash equivalents"&gt;7,885&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_8AE_zpOVZJDTs09h" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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_906_eus-gaap--Deposits_iI_c20220731__us-gaap--TypeOfArrangementAxis__custom--RestrictedCashAndSecurityAgreementsMember__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--SantanderBankMember__us-gaap--ShortTermDebtTypeAxis__us-gaap--LetterOfCreditMember_zmjus2Yp2fMc" title="Deposits"&gt;154,000&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 the bank.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"&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; text-align: center; margin-top: 0pt; margin-bottom: 0pt"&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; margin-left: 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Santander
also issued a letter of credit to subsidiaries of Enel Green Power (&#x201c;EGP&#x201d;) pursuant to the Company&#x2019;s contracts with
EGP. This letter of credit was originally issued in the amount of $&lt;span id="xdx_904_eus-gaap--LettersOfCreditOutstandingAmount_iI_c20200831__us-gaap--TypeOfArrangementAxis__custom--RestrictedCashAndSecurityAgreementsMember__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--SantanderBankMember__us-gaap--ShortTermDebtTypeAxis__custom--LetterOneMember_zITRrjl16il7" title="Letters of credit outstanding, Amount"&gt;645,000&lt;/span&gt; and was reduced to $&lt;span id="xdx_908_eus-gaap--LettersOfCreditOutstandingAmount_iI_pp0p0_c20200831__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--SantanderBankMember__us-gaap--ShortTermDebtTypeAxis__custom--LetterTwoMember__us-gaap--AwardDateAxis__custom--AugustTwentyTwentyMember_zPryBf3RlNqg"&gt;323,000&lt;/span&gt; in August 2020. The letter of
credit will be reduced by an additional $&lt;span id="xdx_909_ecustom--LettersOfCreditIssuedAmount_iI_pp0p0_c20220731__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--SantanderBankMember__us-gaap--ShortTermDebtTypeAxis__custom--LetterTwoMember_zfWIdANCv4H7"&gt;258,000&lt;/span&gt; once the PowerBuoy&#xae; (&#x201c;PB3&#x201d;) and its accompanying systems pass final
acceptance testing. The remaining restricted amount of $&lt;span id="xdx_90F_ecustom--LettersOfCreditIssuedAmount_iI_c20220731__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--SantanderBankMember_zEt4FZkuNJFk" title="Letters of credit issued amount"&gt;65,000&lt;/span&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-top: 0pt; margin-bottom: 0pt; margin-left: 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_894_eus-gaap--ScheduleOfRestrictedCashAndCashEquivalentsTextBlock_zK4GorEL60m1" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span id="xdx_8BD_zxublpbXDUyi" 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="display: none; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left"&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 id="xdx_493_20220731_zh4GFdLidXm8" style="text-align: right"&gt;&#160;&lt;/td&gt;&lt;td style="text-align: left"&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 id="xdx_496_20220430" 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"&gt;
    &lt;td&gt;&#160;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;July 31, 2022&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&#160;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;April 30, 2022&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td colspan="6" style="text-align: center"&gt;(in thousands)&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40E_eus-gaap--CashAndCashEquivalentsAtCarryingValue_iI_pn3n3" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="width: 60%; text-align: left"&gt;Cash and cash equivalents&lt;/td&gt;&lt;td style="width: 2%"&gt;&#160;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;$&lt;/td&gt;&lt;td style="width: 16%; text-align: right"&gt;9,176&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="width: 2%"&gt;&#160;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;$&lt;/td&gt;&lt;td style="width: 16%; text-align: right"&gt;7,885&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_401_eus-gaap--RestrictedCashCurrent_iI_pn3n3" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left"&gt;Restricted cash- short term&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;258&lt;/td&gt;&lt;td style="text-align: left"&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;258&lt;/td&gt;&lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40F_eus-gaap--RestrictedCashNoncurrent_iI_pn3n3" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left; padding-bottom: 1.5pt"&gt;Restricted cash- long term&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; text-align: right"&gt;219&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; text-align: right"&gt;219&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40B_eus-gaap--CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_iI_pn3n3_zPoAY8k6bTKg" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="display: none; font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Cash, cash equivalents,
    restricted cash and restricted cash equivalents&lt;/span&gt;&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;$&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; text-align: right"&gt;9,653&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;$&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; text-align: right"&gt;8,362&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_8AF_zb501wK86kH2" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"&gt;&lt;i&gt;Marketable
Securities&lt;/i&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;During
fiscal 2022, the Company acquired investment securities through Charles Schwab Bank. As of July 31, 2022 and April 30, 2022, their
value was approximately $&lt;span id="xdx_90B_eus-gaap--AlternativeInvestment_iI_pn5n6_c20220731_zK7gerDVwuha" title="Investment securities"&gt;42.7&lt;/span&gt;
million and $&lt;span id="xdx_901_eus-gaap--AlternativeInvestment_iI_pn5n6_c20220430_zvnTCS0Curmf"&gt;49.4&lt;/span&gt; million, respectively.
All marketable securities consist of corporate bonds, government agency bonds, or U.S. Treasury Notes and Bonds, are investment
grade rated or better, and mature within 12 months. The Company has the means and intends to hold all investments to maturity, and
as such are classified as held-to-maturity investments and carried at amortized cost. The total recognized interest expense on the
premium we paid for the securities as of July 31, 2022 and 2021 is approximately &lt;span&gt;$&lt;span id="xdx_903_eus-gaap--InvestmentIncomeNetAmortizationOfDiscountAndPremium_pn5n6_c20220501__20220731_z8CzZCnSUQcd" title="Discount and premium"&gt;0.1&lt;/span&gt;
million and &lt;span id="xdx_908_eus-gaap--InvestmentIncomeNetAmortizationOfDiscountAndPremium_dc_c20210501__20210731_zdPYMZcgV65l"&gt;zero&lt;/span&gt;&lt;/span&gt;,
respectively, on an amortized cost basis of approximately $&lt;span id="xdx_907_eus-gaap--TradingSecuritiesDebtAmortizedCost_iI_pn5n6_c20220731_zPQbCWbzjE0i" title="Investment owned at cost"&gt;0.3&lt;/span&gt;
million and &lt;span id="xdx_90E_eus-gaap--TradingSecuritiesDebtAmortizedCost_iI_dc_c20210731_zkobbCmIcW3"&gt;zero&lt;/span&gt;, respectively.
Additionally, there has been no impairment on these investments.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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_89C_eus-gaap--UnrealizedGainLossOnInvestmentsTableTextBlock_zy0USolL0Yg8" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;The
following table summarizes the Company&#x2019;s marketable securities as of July 31, 2022:&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"&gt;&#160;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span id="xdx_8B5_z9L3fZ3W0lYc" style="display: none"&gt;Schedule of Investments and Unrealized Gains/Losses&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="border-bottom: Black 1.5pt solid; font-weight: bold"&gt;Category (in thousands)&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;Market Value&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;Unrealized &lt;br/&gt;
Gains (Losses)&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;Adjusted Cost&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&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: 40%; text-align: left"&gt;Corporate Bonds&lt;/td&gt;&lt;td style="width: 2%"&gt;&#160;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;$&lt;/td&gt;&lt;td id="xdx_983_eus-gaap--MoneyMarketFundsAtCarryingValue_iI_pn3n3_c20220731__us-gaap--InvestmentTypeAxis__custom--CorporateBondsMember_zbVEsGcwCJ3e" style="width: 16%; text-align: right"&gt;31,853&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="width: 2%"&gt;&#160;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;$&lt;/td&gt;&lt;td id="xdx_989_eus-gaap--UnrealizedGainLossOnInvestments_pn3n3_c20220501__20220731__us-gaap--InvestmentTypeAxis__custom--CorporateBondsMember_zMPadx01Tevd" style="width: 16%; text-align: right" title="Unrealized Gains (Losses)"&gt;151&lt;/td&gt;&lt;td style="width: 1%; text-align: left"/&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_98D_eus-gaap--InvestmentOwnedAtCost_iI_pn3n3_c20220731__us-gaap--InvestmentTypeAxis__custom--CorporateBondsMember_ztHmMv2Rflw8" style="width: 16%; text-align: right" title="Total Cost"&gt;32,004&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;Government Bonds &amp;amp; Notes&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_987_eus-gaap--MoneyMarketFundsAtCarryingValue_iI_pn3n3_c20220731__us-gaap--InvestmentTypeAxis__custom--GovernmentBondsandNotesMember_zfwFI7aojBy7" style="text-align: right"&gt;7,986&lt;/td&gt;&lt;td style="text-align: left"&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 id="xdx_984_eus-gaap--UnrealizedGainLossOnInvestments_pn3n3_c20220501__20220731__us-gaap--InvestmentTypeAxis__custom--GovernmentBondsandNotesMember_z5g7p8zQmrRh" style="text-align: right"&gt;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0"&gt;15&lt;/p&gt;&lt;/td&gt;&lt;td style="text-align: left"/&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;td id="xdx_989_eus-gaap--InvestmentOwnedAtCost_iI_pn3n3_c20220731__us-gaap--InvestmentTypeAxis__custom--GovernmentBondsandNotesMember_zF5pwijoQtUi" style="text-align: right"&gt;8,001&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;Government Agency&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_98E_eus-gaap--MoneyMarketFundsAtCarryingValue_iI_pn3n3_c20220731__us-gaap--InvestmentTypeAxis__custom--GovernmentAgencyMember_zWw5N1mEYX6h" style="text-align: right"&gt;2,498&lt;/td&gt;&lt;td style="text-align: left"&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 id="xdx_989_eus-gaap--UnrealizedGainLossOnInvestments_pn3n3_c20220501__20220731__us-gaap--InvestmentTypeAxis__custom--GovernmentAgencyMember_zeDcORknoR4l" style="text-align: right"&gt;11&lt;/td&gt;&lt;td style="text-align: left"/&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;td id="xdx_98B_eus-gaap--InvestmentOwnedAtCost_iI_pn3n3_c20220731__us-gaap--InvestmentTypeAxis__custom--GovernmentAgencyMember_zO4lZrYtZWm9" style="text-align: right"&gt;2,509&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: 1.5pt; text-align: left"&gt;Accrued Interest&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td id="xdx_987_eus-gaap--MoneyMarketFundsAtCarryingValue_iI_pn3n3_c20220731__us-gaap--InvestmentTypeAxis__custom--AccuredInterestMember_z47q2mQiLDw" style="border-bottom: Black 1.5pt solid; text-align: right"&gt;311&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td id="xdx_982_eus-gaap--UnrealizedGainLossOnInvestments_pn3n3_c20220501__20220731__us-gaap--InvestmentTypeAxis__custom--AccuredInterestMember_zT3RaadU94yi" style="border-bottom: Black 1.5pt solid; text-align: right"&gt;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0"&gt;(101&lt;/p&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;)&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td id="xdx_987_eus-gaap--InvestmentOwnedAtCost_iI_pn3n3_c20220731__us-gaap--InvestmentTypeAxis__custom--AccuredInterestMember_zdvAi8j3uMvc" style="border-bottom: Black 1.5pt solid; text-align: right"&gt;210&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; 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; padding-bottom: 2.5pt"&gt;Total Marketable Securities&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_98C_eus-gaap--MoneyMarketFundsAtCarryingValue_iI_pn3n3_c20220731_zakQom9mo99e" style="border-bottom: Black 2.5pt double; text-align: right" title="Market Value"&gt;42,648&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&#160;&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;$&lt;/td&gt;&lt;td id="xdx_98F_eus-gaap--UnrealizedGainLossOnInvestments_pn3n3_c20220501__20220731_zETDZCRAGEye" style="border-bottom: Black 2.5pt double; text-align: right" title="Unrealized Gains (Losses)"&gt;(76&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;)&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;$&lt;/td&gt;&lt;td id="xdx_986_eus-gaap--InvestmentOwnedAtCost_iI_pn3n3_c20220731_zV6uJbdPQM6i" style="border-bottom: Black 2.5pt double; text-align: right" title="Total Cost"&gt;42,724&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_8A0_z93hOAE3fV8j" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0"&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;

</us-gaap:CashAndCashEquivalentsRestrictedCashAndCashEquivalentsPolicy>
    <us-gaap:ScheduleOfCashAndCashEquivalentsTableTextBlock contextRef="From2022-05-01to2022-07-31">&lt;p id="xdx_899_eus-gaap--ScheduleOfCashAndCashEquivalentsTableTextBlock_z2mEzmhIBMT7" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span id="xdx_8B4_zeno9R6Dqtwd" 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="vertical-align: bottom"&gt;
    &lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;July 31, 2022&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;April 30, 2022&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td colspan="6" style="text-align: center"&gt;(in thousands)&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2"&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2"&gt;&#160;&lt;/td&gt;&lt;td&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: 60%; text-align: left"&gt;Checking and savings accounts&lt;/td&gt;&lt;td style="width: 2%"&gt;&#160;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;$&lt;/td&gt;&lt;td id="xdx_98A_eus-gaap--CashAndCashEquivalentsAtCarryingValue_iI_pn3n3_c20220731__us-gaap--CashAndCashEquivalentsAxis__custom--CheckingAndSavingsAccountsMember_zgvAdKuStM47" style="width: 16%; text-align: right" title="Cash and cash equivalents"&gt;2,029&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="width: 2%"&gt;&#160;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;$&lt;/td&gt;&lt;td id="xdx_98A_eus-gaap--CashAndCashEquivalentsAtCarryingValue_iI_pn3n3_c20220430__us-gaap--CashAndCashEquivalentsAxis__custom--CheckingAndSavingsAccountsMember_zhIqmUCtNui9" style="width: 16%; text-align: right" title="Cash and cash equivalents"&gt;1,815&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; padding-bottom: 1.5pt"&gt;Money market account&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td id="xdx_982_eus-gaap--CashAndCashEquivalentsAtCarryingValue_iI_pn3n3_c20220731__us-gaap--CashAndCashEquivalentsAxis__us-gaap--MoneyMarketFundsMember_zxC9aaEj0T74" style="border-bottom: Black 1.5pt solid; text-align: right" title="Cash and cash equivalents"&gt;7,147&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td id="xdx_980_eus-gaap--CashAndCashEquivalentsAtCarryingValue_iI_pn3n3_c20220430__us-gaap--CashAndCashEquivalentsAxis__us-gaap--MoneyMarketFundsMember_zfhRJOMZL0Kf" style="border-bottom: Black 1.5pt solid; text-align: right" title="Cash and cash equivalents"&gt;6,070&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; 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"&gt;&#160;&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;$&lt;/td&gt;&lt;td id="xdx_985_eus-gaap--CashAndCashEquivalentsAtCarryingValue_iI_pn3n3_c20220731_zk7z4N27ervh" style="border-bottom: Black 2.5pt double; text-align: right" title="Cash and cash equivalents"&gt;9,176&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;$&lt;/td&gt;&lt;td id="xdx_98E_eus-gaap--CashAndCashEquivalentsAtCarryingValue_iI_pn3n3_c20220430_zlkkwhY2mE2i" style="border-bottom: Black 2.5pt double; text-align: right" title="Cash and cash equivalents"&gt;7,885&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:ScheduleOfCashAndCashEquivalentsTableTextBlock>
    <us-gaap:CashAndCashEquivalentsAtCarryingValue
      contextRef="AsOf2022-07-31_custom_CheckingAndSavingsAccountsMember"
      decimals="-3"
      unitRef="USD">2029000</us-gaap:CashAndCashEquivalentsAtCarryingValue>
    <us-gaap:CashAndCashEquivalentsAtCarryingValue
      contextRef="AsOf2022-04-30_custom_CheckingAndSavingsAccountsMember"
      decimals="-3"
      unitRef="USD">1815000</us-gaap:CashAndCashEquivalentsAtCarryingValue>
    <us-gaap:CashAndCashEquivalentsAtCarryingValue
      contextRef="AsOf2022-07-31_us-gaap_MoneyMarketFundsMember"
      decimals="-3"
      unitRef="USD">7147000</us-gaap:CashAndCashEquivalentsAtCarryingValue>
    <us-gaap:CashAndCashEquivalentsAtCarryingValue
      contextRef="AsOf2022-04-30_us-gaap_MoneyMarketFundsMember"
      decimals="-3"
      unitRef="USD">6070000</us-gaap:CashAndCashEquivalentsAtCarryingValue>
    <us-gaap:CashAndCashEquivalentsAtCarryingValue contextRef="AsOf2022-07-31" decimals="-3" unitRef="USD">9176000</us-gaap:CashAndCashEquivalentsAtCarryingValue>
    <us-gaap:CashAndCashEquivalentsAtCarryingValue contextRef="AsOf2022-04-30" decimals="-3" unitRef="USD">7885000</us-gaap:CashAndCashEquivalentsAtCarryingValue>
    <us-gaap:Deposits
      contextRef="AsOf2022-07-31_custom_RestrictedCashAndSecurityAgreementsMember_custom_SantanderBankMember_us-gaap_LetterOfCreditMember"
      decimals="0"
      unitRef="USD">154000</us-gaap:Deposits>
    <us-gaap:LettersOfCreditOutstandingAmount
      contextRef="AsOf2020-08-31_custom_RestrictedCashAndSecurityAgreementsMember_custom_SantanderBankMember_custom_LetterOneMember"
      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="AsOf2022-07-31_custom_SantanderBankMember_custom_LetterTwoMember"
      decimals="0"
      unitRef="USD">258000</OPTT:LettersOfCreditIssuedAmount>
    <OPTT:LettersOfCreditIssuedAmount
      contextRef="AsOf2022-07-31_custom_SantanderBankMember"
      decimals="0"
      unitRef="USD">65000</OPTT:LettersOfCreditIssuedAmount>
    <us-gaap:ScheduleOfRestrictedCashAndCashEquivalentsTextBlock contextRef="From2022-05-01to2022-07-31">&lt;p id="xdx_894_eus-gaap--ScheduleOfRestrictedCashAndCashEquivalentsTextBlock_zK4GorEL60m1" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span id="xdx_8BD_zxublpbXDUyi" 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="display: none; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left"&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 id="xdx_493_20220731_zh4GFdLidXm8" style="text-align: right"&gt;&#160;&lt;/td&gt;&lt;td style="text-align: left"&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 id="xdx_496_20220430" 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"&gt;
    &lt;td&gt;&#160;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;July 31, 2022&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&#160;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;April 30, 2022&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td colspan="6" style="text-align: center"&gt;(in thousands)&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40E_eus-gaap--CashAndCashEquivalentsAtCarryingValue_iI_pn3n3" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="width: 60%; text-align: left"&gt;Cash and cash equivalents&lt;/td&gt;&lt;td style="width: 2%"&gt;&#160;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;$&lt;/td&gt;&lt;td style="width: 16%; text-align: right"&gt;9,176&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="width: 2%"&gt;&#160;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;$&lt;/td&gt;&lt;td style="width: 16%; text-align: right"&gt;7,885&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_401_eus-gaap--RestrictedCashCurrent_iI_pn3n3" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left"&gt;Restricted cash- short term&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;258&lt;/td&gt;&lt;td style="text-align: left"&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;258&lt;/td&gt;&lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40F_eus-gaap--RestrictedCashNoncurrent_iI_pn3n3" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left; padding-bottom: 1.5pt"&gt;Restricted cash- long term&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; text-align: right"&gt;219&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; text-align: right"&gt;219&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40B_eus-gaap--CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_iI_pn3n3_zPoAY8k6bTKg" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="display: none; font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Cash, cash equivalents,
    restricted cash and restricted cash equivalents&lt;/span&gt;&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;$&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; text-align: right"&gt;9,653&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;$&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; text-align: right"&gt;8,362&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:ScheduleOfRestrictedCashAndCashEquivalentsTextBlock>
    <us-gaap:CashAndCashEquivalentsAtCarryingValue contextRef="AsOf2022-07-31" decimals="-3" unitRef="USD">9176000</us-gaap:CashAndCashEquivalentsAtCarryingValue>
    <us-gaap:CashAndCashEquivalentsAtCarryingValue contextRef="AsOf2022-04-30" decimals="-3" unitRef="USD">7885000</us-gaap:CashAndCashEquivalentsAtCarryingValue>
    <us-gaap:RestrictedCashCurrent contextRef="AsOf2022-07-31" decimals="-3" unitRef="USD">258000</us-gaap:RestrictedCashCurrent>
    <us-gaap:RestrictedCashCurrent contextRef="AsOf2022-04-30" decimals="-3" unitRef="USD">258000</us-gaap:RestrictedCashCurrent>
    <us-gaap:RestrictedCashNoncurrent contextRef="AsOf2022-07-31" decimals="-3" unitRef="USD">219000</us-gaap:RestrictedCashNoncurrent>
    <us-gaap:RestrictedCashNoncurrent contextRef="AsOf2022-04-30" decimals="-3" unitRef="USD">219000</us-gaap:RestrictedCashNoncurrent>
    <us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents contextRef="AsOf2022-07-31" decimals="-3" unitRef="USD">9653000</us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents>
    <us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents contextRef="AsOf2022-04-30" decimals="-3" unitRef="USD">8362000</us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents>
    <us-gaap:AlternativeInvestment contextRef="AsOf2022-07-31" decimals="-5" unitRef="USD">42700000</us-gaap:AlternativeInvestment>
    <us-gaap:AlternativeInvestment contextRef="AsOf2022-04-30" decimals="-5" unitRef="USD">49400000</us-gaap:AlternativeInvestment>
    <us-gaap:InvestmentIncomeNetAmortizationOfDiscountAndPremium
      contextRef="From2022-05-01to2022-07-31"
      decimals="-5"
      unitRef="USD">100000</us-gaap:InvestmentIncomeNetAmortizationOfDiscountAndPremium>
    <us-gaap:InvestmentIncomeNetAmortizationOfDiscountAndPremium
      contextRef="From2021-05-012021-07-31"
      decimals="0"
      unitRef="USD">0</us-gaap:InvestmentIncomeNetAmortizationOfDiscountAndPremium>
    <us-gaap:TradingSecuritiesDebtAmortizedCost contextRef="AsOf2022-07-31" decimals="-5" unitRef="USD">300000</us-gaap:TradingSecuritiesDebtAmortizedCost>
    <us-gaap:TradingSecuritiesDebtAmortizedCost contextRef="AsOf2021-07-31" decimals="0" unitRef="USD">0</us-gaap:TradingSecuritiesDebtAmortizedCost>
    <us-gaap:UnrealizedGainLossOnInvestmentsTableTextBlock contextRef="From2022-05-01to2022-07-31">&lt;p id="xdx_89C_eus-gaap--UnrealizedGainLossOnInvestmentsTableTextBlock_zy0USolL0Yg8" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;The
following table summarizes the Company&#x2019;s marketable securities as of July 31, 2022:&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"&gt;&#160;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span id="xdx_8B5_z9L3fZ3W0lYc" style="display: none"&gt;Schedule of Investments and Unrealized Gains/Losses&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="border-bottom: Black 1.5pt solid; font-weight: bold"&gt;Category (in thousands)&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;Market Value&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;Unrealized &lt;br/&gt;
Gains (Losses)&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;Adjusted Cost&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&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: 40%; text-align: left"&gt;Corporate Bonds&lt;/td&gt;&lt;td style="width: 2%"&gt;&#160;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;$&lt;/td&gt;&lt;td id="xdx_983_eus-gaap--MoneyMarketFundsAtCarryingValue_iI_pn3n3_c20220731__us-gaap--InvestmentTypeAxis__custom--CorporateBondsMember_zbVEsGcwCJ3e" style="width: 16%; text-align: right"&gt;31,853&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="width: 2%"&gt;&#160;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;$&lt;/td&gt;&lt;td id="xdx_989_eus-gaap--UnrealizedGainLossOnInvestments_pn3n3_c20220501__20220731__us-gaap--InvestmentTypeAxis__custom--CorporateBondsMember_zMPadx01Tevd" style="width: 16%; text-align: right" title="Unrealized Gains (Losses)"&gt;151&lt;/td&gt;&lt;td style="width: 1%; text-align: left"/&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_98D_eus-gaap--InvestmentOwnedAtCost_iI_pn3n3_c20220731__us-gaap--InvestmentTypeAxis__custom--CorporateBondsMember_ztHmMv2Rflw8" style="width: 16%; text-align: right" title="Total Cost"&gt;32,004&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;Government Bonds &amp;amp; Notes&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_987_eus-gaap--MoneyMarketFundsAtCarryingValue_iI_pn3n3_c20220731__us-gaap--InvestmentTypeAxis__custom--GovernmentBondsandNotesMember_zfwFI7aojBy7" style="text-align: right"&gt;7,986&lt;/td&gt;&lt;td style="text-align: left"&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 id="xdx_984_eus-gaap--UnrealizedGainLossOnInvestments_pn3n3_c20220501__20220731__us-gaap--InvestmentTypeAxis__custom--GovernmentBondsandNotesMember_z5g7p8zQmrRh" style="text-align: right"&gt;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0"&gt;15&lt;/p&gt;&lt;/td&gt;&lt;td style="text-align: left"/&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;td id="xdx_989_eus-gaap--InvestmentOwnedAtCost_iI_pn3n3_c20220731__us-gaap--InvestmentTypeAxis__custom--GovernmentBondsandNotesMember_zF5pwijoQtUi" style="text-align: right"&gt;8,001&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;Government Agency&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_98E_eus-gaap--MoneyMarketFundsAtCarryingValue_iI_pn3n3_c20220731__us-gaap--InvestmentTypeAxis__custom--GovernmentAgencyMember_zWw5N1mEYX6h" style="text-align: right"&gt;2,498&lt;/td&gt;&lt;td style="text-align: left"&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 id="xdx_989_eus-gaap--UnrealizedGainLossOnInvestments_pn3n3_c20220501__20220731__us-gaap--InvestmentTypeAxis__custom--GovernmentAgencyMember_zeDcORknoR4l" style="text-align: right"&gt;11&lt;/td&gt;&lt;td style="text-align: left"/&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;td id="xdx_98B_eus-gaap--InvestmentOwnedAtCost_iI_pn3n3_c20220731__us-gaap--InvestmentTypeAxis__custom--GovernmentAgencyMember_zO4lZrYtZWm9" style="text-align: right"&gt;2,509&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: 1.5pt; text-align: left"&gt;Accrued Interest&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td id="xdx_987_eus-gaap--MoneyMarketFundsAtCarryingValue_iI_pn3n3_c20220731__us-gaap--InvestmentTypeAxis__custom--AccuredInterestMember_z47q2mQiLDw" style="border-bottom: Black 1.5pt solid; text-align: right"&gt;311&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td id="xdx_982_eus-gaap--UnrealizedGainLossOnInvestments_pn3n3_c20220501__20220731__us-gaap--InvestmentTypeAxis__custom--AccuredInterestMember_zT3RaadU94yi" style="border-bottom: Black 1.5pt solid; text-align: right"&gt;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0"&gt;(101&lt;/p&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;)&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td id="xdx_987_eus-gaap--InvestmentOwnedAtCost_iI_pn3n3_c20220731__us-gaap--InvestmentTypeAxis__custom--AccuredInterestMember_zdvAi8j3uMvc" style="border-bottom: Black 1.5pt solid; text-align: right"&gt;210&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; 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; padding-bottom: 2.5pt"&gt;Total Marketable Securities&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_98C_eus-gaap--MoneyMarketFundsAtCarryingValue_iI_pn3n3_c20220731_zakQom9mo99e" style="border-bottom: Black 2.5pt double; text-align: right" title="Market Value"&gt;42,648&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&#160;&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;$&lt;/td&gt;&lt;td id="xdx_98F_eus-gaap--UnrealizedGainLossOnInvestments_pn3n3_c20220501__20220731_zETDZCRAGEye" style="border-bottom: Black 2.5pt double; text-align: right" title="Unrealized Gains (Losses)"&gt;(76&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;)&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;$&lt;/td&gt;&lt;td id="xdx_986_eus-gaap--InvestmentOwnedAtCost_iI_pn3n3_c20220731_zV6uJbdPQM6i" style="border-bottom: Black 2.5pt double; text-align: right" title="Total Cost"&gt;42,724&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:UnrealizedGainLossOnInvestmentsTableTextBlock>
    <us-gaap:MoneyMarketFundsAtCarryingValue
      contextRef="AsOf2022-07-31_custom_CorporateBondsMember"
      decimals="-3"
      unitRef="USD">31853000</us-gaap:MoneyMarketFundsAtCarryingValue>
    <us-gaap:UnrealizedGainLossOnInvestments
      contextRef="From2022-05-012022-07-31_custom_CorporateBondsMember"
      decimals="-3"
      unitRef="USD">151000</us-gaap:UnrealizedGainLossOnInvestments>
    <us-gaap:InvestmentOwnedAtCost
      contextRef="AsOf2022-07-31_custom_CorporateBondsMember"
      decimals="-3"
      unitRef="USD">32004000</us-gaap:InvestmentOwnedAtCost>
    <us-gaap:MoneyMarketFundsAtCarryingValue
      contextRef="AsOf2022-07-31_custom_GovernmentBondsandNotesMember"
      decimals="-3"
      unitRef="USD">7986000</us-gaap:MoneyMarketFundsAtCarryingValue>
    <us-gaap:UnrealizedGainLossOnInvestments
      contextRef="From2022-05-012022-07-31_custom_GovernmentBondsandNotesMember"
      decimals="-3"
      unitRef="USD">15000</us-gaap:UnrealizedGainLossOnInvestments>
    <us-gaap:InvestmentOwnedAtCost
      contextRef="AsOf2022-07-31_custom_GovernmentBondsandNotesMember"
      decimals="-3"
      unitRef="USD">8001000</us-gaap:InvestmentOwnedAtCost>
    <us-gaap:MoneyMarketFundsAtCarryingValue
      contextRef="AsOf2022-07-31_custom_GovernmentAgencyMember"
      decimals="-3"
      unitRef="USD">2498000</us-gaap:MoneyMarketFundsAtCarryingValue>
    <us-gaap:UnrealizedGainLossOnInvestments
      contextRef="From2022-05-012022-07-31_custom_GovernmentAgencyMember"
      decimals="-3"
      unitRef="USD">11000</us-gaap:UnrealizedGainLossOnInvestments>
    <us-gaap:InvestmentOwnedAtCost
      contextRef="AsOf2022-07-31_custom_GovernmentAgencyMember"
      decimals="-3"
      unitRef="USD">2509000</us-gaap:InvestmentOwnedAtCost>
    <us-gaap:MoneyMarketFundsAtCarryingValue
      contextRef="AsOf2022-07-31_custom_AccuredInterestMember"
      decimals="-3"
      unitRef="USD">311000</us-gaap:MoneyMarketFundsAtCarryingValue>
    <us-gaap:UnrealizedGainLossOnInvestments
      contextRef="From2022-05-012022-07-31_custom_AccuredInterestMember"
      decimals="-3"
      unitRef="USD">-101000</us-gaap:UnrealizedGainLossOnInvestments>
    <us-gaap:InvestmentOwnedAtCost
      contextRef="AsOf2022-07-31_custom_AccuredInterestMember"
      decimals="-3"
      unitRef="USD">210000</us-gaap:InvestmentOwnedAtCost>
    <us-gaap:MoneyMarketFundsAtCarryingValue contextRef="AsOf2022-07-31" decimals="-3" unitRef="USD">42648000</us-gaap:MoneyMarketFundsAtCarryingValue>
    <us-gaap:UnrealizedGainLossOnInvestments
      contextRef="From2022-05-01to2022-07-31"
      decimals="-3"
      unitRef="USD">-76000</us-gaap:UnrealizedGainLossOnInvestments>
    <us-gaap:InvestmentOwnedAtCost contextRef="AsOf2022-07-31" decimals="-3" unitRef="USD">42724000</us-gaap:InvestmentOwnedAtCost>
    <us-gaap:ConcentrationRiskCreditRisk contextRef="From2022-05-01to2022-07-31">&lt;p id="xdx_843_eus-gaap--ConcentrationRiskCreditRisk_zhyngZhx0eec" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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_86A_zd4lzaSIJqL5"&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-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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 trade accounts receivable, marketable securities
and cash. The Company believes that its credit risk is limited because the Company&#x2019;s current contracts are with companies with
a reliable payment history. The Company invests its excess cash in a money market fund and short term held-to maturity investment and
does not believe that it is exposed to any significant risks related to its cash accounts, money market fund, or held-to maturity investments.
Cash is also maintained at foreign financial institutions. Cash in foreign financial institutions as of July 31, 2022 was approximately
$&lt;span id="xdx_901_eus-gaap--CashAndCashEquivalentsAtCarryingValue_iI_c20220731__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--ForeignFinancialInstitutionsMember_zSrmd6XLlCah" title="Cash and cash equivalents"&gt;24,000&lt;/span&gt;.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"&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; text-align: center; margin-top: 0pt; margin-bottom: 0pt"&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; margin-left: 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;For the three months ended July 31, 2022 and 2021, the Company had three
and two customers whose revenues accounted for at least 10% of the Company&#x2019;s consolidated revenues, respectively. These revenue
accounted for approximately &lt;span id="xdx_90A_eus-gaap--ConcentrationRiskPercentage1_pid_dp_uPure_c20220501__20220731__us-gaap--ConcentrationRiskByBenchmarkAxis__us-gaap--SalesRevenueNetMember__us-gaap--ConcentrationRiskByTypeAxis__us-gaap--CustomerConcentrationRiskMember__srt--MajorCustomersAxis__custom--ThreeAndTwoCustomersMember_zZULkty2L83i" title="Concentration risk percentage"&gt;69%&lt;/span&gt; and &lt;span id="xdx_90E_eus-gaap--ConcentrationRiskPercentage1_pid_dp_uPure_c20210501__20210731__us-gaap--ConcentrationRiskByBenchmarkAxis__us-gaap--SalesRevenueNetMember__us-gaap--ConcentrationRiskByTypeAxis__us-gaap--CustomerConcentrationRiskMember__srt--MajorCustomersAxis__custom--ThreeAndTwoCustomersMember_zWyNdRNlwj2d" title="Concentration risk percentage"&gt;88%&lt;/span&gt; of the Company&#x2019;s total revenue for the respective periods.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span/&gt;&lt;/span&gt;&lt;/p&gt;


&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0"&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;

</us-gaap:ConcentrationRiskCreditRisk>
    <us-gaap:CashAndCashEquivalentsAtCarryingValue
      contextRef="AsOf2022-07-31_custom_ForeignFinancialInstitutionsMember"
      decimals="0"
      unitRef="USD">24000</us-gaap:CashAndCashEquivalentsAtCarryingValue>
    <us-gaap:ConcentrationRiskPercentage1
      contextRef="From2022-05-012022-07-31_us-gaap_SalesRevenueNetMember_us-gaap_CustomerConcentrationRiskMember_custom_ThreeAndTwoCustomersMember"
      decimals="INF"
      unitRef="Pure">0.69</us-gaap:ConcentrationRiskPercentage1>
    <us-gaap:ConcentrationRiskPercentage1
      contextRef="From2021-05-012021-07-31_us-gaap_SalesRevenueNetMember_us-gaap_CustomerConcentrationRiskMember_custom_ThreeAndTwoCustomersMember"
      decimals="INF"
      unitRef="Pure">0.88</us-gaap:ConcentrationRiskPercentage1>
    <us-gaap:ShareBasedCompensationOptionAndIncentivePlansPolicy contextRef="From2022-05-01to2022-07-31">&lt;p id="xdx_844_eus-gaap--ShareBasedCompensationOptionAndIncentivePlansPolicy_zOFgg3OGWX34" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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_861_zuRz3CqFkZa6"&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-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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
aggregate share-based compensation expense recorded in the Consolidated Statements of Operations for the three months ended July 31,
2022 and 2021 was approximately $&lt;span id="xdx_904_eus-gaap--EmployeeBenefitsAndShareBasedCompensation_pn5n6_c20220501__20220731_zYP0Yjn2N4De" title="Share based compensation"&gt;0.3&lt;/span&gt; million and $&lt;span id="xdx_90C_eus-gaap--EmployeeBenefitsAndShareBasedCompensation_pn5n6_c20210501__20210731_zcJcrwZiD7m3" title="Share based compensation"&gt;0.4&lt;/span&gt; million, respectively.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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:ShareBasedCompensationOptionAndIncentivePlansPolicy>
    <us-gaap:EmployeeBenefitsAndShareBasedCompensation
      contextRef="From2022-05-01to2022-07-31"
      decimals="-5"
      unitRef="USD">300000</us-gaap:EmployeeBenefitsAndShareBasedCompensation>
    <us-gaap:EmployeeBenefitsAndShareBasedCompensation
      contextRef="From2021-05-012021-07-31"
      decimals="-5"
      unitRef="USD">400000</us-gaap:EmployeeBenefitsAndShareBasedCompensation>
    <us-gaap:RevenueFromContractWithCustomerPolicyTextBlock contextRef="From2022-05-01to2022-07-31">&lt;p id="xdx_84C_eus-gaap--RevenueFromContractWithCustomerPolicyTextBlock_zmUPHVYHhezi" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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_867_zjoHurDamM4d"&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-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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 July 31, 2022 and 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 in costs of goods sold, and regular shipping and handling activities charged to operating
expenses.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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 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 labor hours 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-top: 0pt; margin-bottom: 0pt; text-align: center"&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; text-align: center; margin-top: 0pt; margin-bottom: 0pt"&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; margin-left: 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, fixed-price contracts, time and material agreements, or lease agreements. 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-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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 three-month periods ended July 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-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Time
and materials agreements are billed based solely on the cost of time spent working on the contract and the material used.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;As
of July 31, 2022, the Company&#x2019;s total remaining performance obligations, also referred to as backlog, totaled $&lt;span id="xdx_902_eus-gaap--RevenueRemainingPerformanceObligation_iI_pn5n6_c20220731_zKAvsRrnxtCe" title="Revenue remaining performance obligation"&gt;0.3&lt;/span&gt; million. The
Company expects to recognize &lt;span id="xdx_90E_ecustom--RevenueRemainingPerformancesObligationPercentage_pid_dp_uPure_c20220501__20220731_zTXiNH9SEdVg" title="Revenue remaining performance obligation, percentage"&gt;100&lt;/span&gt;%, or $&lt;span id="xdx_907_eus-gaap--RevenueRemainingPerformanceObligation_iI_pn5n6_c20220731_zZI2Z4Rjj0u" title="Revenue remaining performance obligation"&gt;0.3&lt;/span&gt; million, 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-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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&#xae;&#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-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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 others are treated as operating leases.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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 Statement of Operations.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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="AsOf2022-07-31" decimals="-5" unitRef="USD">300000</us-gaap:RevenueRemainingPerformanceObligation>
    <OPTT:RevenueRemainingPerformancesObligationPercentage
      contextRef="From2022-05-01to2022-07-31"
      decimals="INF"
      unitRef="Pure">1</OPTT:RevenueRemainingPerformancesObligationPercentage>
    <us-gaap:RevenueRemainingPerformanceObligation contextRef="AsOf2022-07-31" decimals="-5" unitRef="USD">300000</us-gaap:RevenueRemainingPerformanceObligation>
    <us-gaap:EarningsPerSharePolicyTextBlock contextRef="From2022-05-01to2022-07-31">&lt;p id="xdx_84F_eus-gaap--EarningsPerSharePolicyTextBlock_znJF9QQGkLy5" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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;(g)
&lt;span id="xdx_866_zf9WVT2MM7E9"&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-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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 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 period. 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 the basic earnings per share number. Due
to the Company&#x2019;s net losses, potentially dilutive securities, consisting of options to purchase shares of common stock, potential
exercises of warrants on common stock and unvested restricted stock issued to employees and non-employee directors, were excluded from
the diluted loss per 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-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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 share on the Consolidated Statement of Operations, potential exercises of warrants on 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_pid_c20220501__20220731_zlWXvMhyVAb1" title="Antidilutive securities earnings per share"&gt;6,378,218&lt;/span&gt;
and &lt;span id="xdx_90C_eus-gaap--AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_pid_c20210501__20210731_zG7Kn0DuRnTa"&gt;5,243,647&lt;/span&gt; for the three months ended July 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-top: 0pt; margin-bottom: 0pt; margin-left: 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="From2022-05-01to2022-07-31"
      decimals="INF"
      unitRef="Shares">6378218</us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount>
    <us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
      contextRef="From2021-05-012021-07-31"
      decimals="INF"
      unitRef="Shares">5243647</us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount>
    <us-gaap:NewAccountingPronouncementsPolicyPolicyTextBlock contextRef="From2022-05-01to2022-07-31">&lt;p id="xdx_84A_eus-gaap--NewAccountingPronouncementsPolicyPolicyTextBlock_zLTdh0sXipBf" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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_861_zCViT2nSy448"&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-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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 the adoption of ASU 2016-13 will have on its consolidated financial statements.&lt;/span&gt;&lt;/p&gt;

</us-gaap:NewAccountingPronouncementsPolicyPolicyTextBlock>
    <OPTT:AccountReceivableContractAssetsAndContractLiabilitiesTextBlock contextRef="From2022-05-01to2022-07-31">&lt;p id="xdx_809_ecustom--AccountReceivableContractAssetsAndContractLiabilitiesTextBlock_zyNJuQPXHy37" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;(3)
&lt;span id="xdx_825_zkZQhiADfjKi"&gt;Account Receivable, Contract Assets and Contract Liabilities&lt;/span&gt;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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_897_ecustom--ScheduleOfAccountsReceivableContractAssetsAndContractLiabilitiesTableTextBlock_zShJTKBeI9bd" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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, contract assets and contract liabilities from
contracts with customers:&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span id="xdx_8B9_zrUmZ0Lcunb2" 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="display: none; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left"&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 id="xdx_497_20220731_z5ZaDyACGXWb" style="text-align: right"&gt;&#160;&lt;/td&gt;&lt;td style="text-align: left"&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 id="xdx_49F_20220430_zdDRSoeKIsag" 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"&gt;
    &lt;td&gt;&#160;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;July 31, 2022&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&#160;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;April 30, 2022&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td colspan="6" style="text-align: center"&gt;(in thousands)&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_401_eus-gaap--AccountsReceivableNetCurrent_iI_pn3n3" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="width: 60%; text-align: left"&gt;Accounts receivable&lt;/td&gt;&lt;td style="width: 2%"&gt;&#160;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;$&lt;/td&gt;&lt;td style="width: 16%; text-align: right"&gt;119&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="width: 2%"&gt;&#160;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;$&lt;/td&gt;&lt;td style="width: 16%; text-align: right"&gt;482&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_404_eus-gaap--ContractWithCustomerAssetNetCurrent_iI_pn3n3" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left"&gt;Contract assets&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;666&lt;/td&gt;&lt;td style="text-align: left"&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;386&lt;/td&gt;&lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40F_eus-gaap--ContractWithCustomerLiabilityCurrent_iI_pn3n3" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left"&gt;Contract liabilities&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;101&lt;/td&gt;&lt;td style="text-align: left"&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;129&lt;/td&gt;&lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

&lt;p id="xdx_8AE_zV58CCurFZo5" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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 conditional on completing additional
tasks or services for a performance obligation. The increase in contract assets is primarily a result of services performed relating
to MAR projects for which revenue was recognized but not billed during the three months ended July 31, 2022.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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_89C_eus-gaap--ContractWithCustomerAssetAndLiabilityTableTextBlock_zwU5axYIOOHa" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Significant
changes in the contract assets balances during the period were as follows:&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span id="xdx_8B0_zpqBHf41XgX6" 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="display: none; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left; padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td id="xdx_497_20220501__20220731_zTAh4pcPdt65" style="border-bottom: Black 1.5pt solid; text-align: right"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom"&gt;
    &lt;td&gt;&#160;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;Three months ended&lt;br/&gt;
 July 31, 2022&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"&gt;(in thousands)&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_408_eus-gaap--ContractWithCustomerAssetNet_iNE_pn3n3_di_z9UGZipIuIoi" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="width: 78%; text-align: left"&gt;Transferred to receivables from contract assets recognized at the beginning of the period&lt;/td&gt;&lt;td style="width: 2%"&gt;&#160;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;$&lt;/td&gt;&lt;td style="width: 18%; text-align: right"&gt;(434&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;)&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40B_ecustom--RevenueRecognizedAndNotBilledAsOfEndOfPeriod_pn3n3_zwGWDLzWlDv3" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left; padding-bottom: 1.5pt"&gt;Revenue recognized and not billed as of the end of the period&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; text-align: right"&gt;714&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_405_ecustom--IncreaseDecreaseInContractWithCustomerAssets_iT_pn3n3_zr4dZmf5FGIk" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left; padding-bottom: 2.5pt"&gt;Net change in contract assets&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;$&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; text-align: right"&gt;280&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 style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"&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; text-align: center; margin-top: 0pt; margin-bottom: 0pt"&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-top: 0pt; margin-bottom: 0pt; margin-left: 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;i&gt;Contract
Liabilities&lt;/i&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Contract
liabilities consist of amounts invoiced to customers in excess of revenue recognized. The decrease in contract liabilities is primarily
due to payment for MAR projects during the three months ended July 31, 2022 for which we have not recognized revenue.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Significant
changes in the contract liabilities balances during the period are as follows:&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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; border-collapse: collapse; width: 100%"&gt;
  &lt;tr style="display: none; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left; padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td id="xdx_493_20220501__20220731_zKRA53S5Vu71" style="border-bottom: Black 1.5pt solid; text-align: right"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom"&gt;
    &lt;td&gt;&#160;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;Three months ended &lt;br/&gt;
July 31, 2022&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="text-align: center"&gt;(in thousands)&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="text-align: right"&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_401_eus-gaap--ContractWithCustomerLiability_iNE_pn3n3_di_zFWRjaSiqv3" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="width: 78%; text-align: left"&gt;Revenue recognized that was included in the contract liabilities balance as of the beginning of the period&lt;/td&gt;&lt;td style="width: 2%"&gt;&#160;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;$&lt;/td&gt;&lt;td style="width: 18%; text-align: right"&gt;(91&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;)&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_400_ecustom--PaymentsCollectedForWhichRevenueHasNotBeenRecognized_pn3n3_zbm3Bj8xL912" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left; padding-bottom: 1.5pt"&gt;Payments collected for which revenue has not been recognized&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; text-align: right"&gt;63&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40E_eus-gaap--IncreaseDecreaseInContractWithCustomerLiability_iT_pn3n3_z3CZYwu3vCo2" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left; padding-bottom: 2.5pt"&gt;Net change in contract liabilities&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;$&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; text-align: right"&gt;(28&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;)&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

&lt;p id="xdx_8A8_zPTRiSWbKBvi" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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="From2022-05-01to2022-07-31">&lt;p id="xdx_897_ecustom--ScheduleOfAccountsReceivableContractAssetsAndContractLiabilitiesTableTextBlock_zShJTKBeI9bd" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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, contract assets and contract liabilities from
contracts with customers:&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span id="xdx_8B9_zrUmZ0Lcunb2" 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="display: none; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left"&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 id="xdx_497_20220731_z5ZaDyACGXWb" style="text-align: right"&gt;&#160;&lt;/td&gt;&lt;td style="text-align: left"&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 id="xdx_49F_20220430_zdDRSoeKIsag" 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"&gt;
    &lt;td&gt;&#160;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;July 31, 2022&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&#160;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;April 30, 2022&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td colspan="6" style="text-align: center"&gt;(in thousands)&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_401_eus-gaap--AccountsReceivableNetCurrent_iI_pn3n3" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="width: 60%; text-align: left"&gt;Accounts receivable&lt;/td&gt;&lt;td style="width: 2%"&gt;&#160;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;$&lt;/td&gt;&lt;td style="width: 16%; text-align: right"&gt;119&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="width: 2%"&gt;&#160;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;$&lt;/td&gt;&lt;td style="width: 16%; text-align: right"&gt;482&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_404_eus-gaap--ContractWithCustomerAssetNetCurrent_iI_pn3n3" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left"&gt;Contract assets&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;666&lt;/td&gt;&lt;td style="text-align: left"&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;386&lt;/td&gt;&lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40F_eus-gaap--ContractWithCustomerLiabilityCurrent_iI_pn3n3" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left"&gt;Contract liabilities&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;101&lt;/td&gt;&lt;td style="text-align: left"&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;129&lt;/td&gt;&lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

</OPTT:ScheduleOfAccountsReceivableContractAssetsAndContractLiabilitiesTableTextBlock>
    <us-gaap:AccountsReceivableNetCurrent contextRef="AsOf2022-07-31" decimals="-3" unitRef="USD">119000</us-gaap:AccountsReceivableNetCurrent>
    <us-gaap:AccountsReceivableNetCurrent contextRef="AsOf2022-04-30" decimals="-3" unitRef="USD">482000</us-gaap:AccountsReceivableNetCurrent>
    <us-gaap:ContractWithCustomerAssetNetCurrent contextRef="AsOf2022-07-31" decimals="-3" unitRef="USD">666000</us-gaap:ContractWithCustomerAssetNetCurrent>
    <us-gaap:ContractWithCustomerAssetNetCurrent contextRef="AsOf2022-04-30" decimals="-3" unitRef="USD">386000</us-gaap:ContractWithCustomerAssetNetCurrent>
    <us-gaap:ContractWithCustomerLiabilityCurrent contextRef="AsOf2022-07-31" decimals="-3" unitRef="USD">101000</us-gaap:ContractWithCustomerLiabilityCurrent>
    <us-gaap:ContractWithCustomerLiabilityCurrent contextRef="AsOf2022-04-30" decimals="-3" unitRef="USD">129000</us-gaap:ContractWithCustomerLiabilityCurrent>
    <us-gaap:ContractWithCustomerAssetAndLiabilityTableTextBlock contextRef="From2022-05-01to2022-07-31">&lt;p id="xdx_89C_eus-gaap--ContractWithCustomerAssetAndLiabilityTableTextBlock_zwU5axYIOOHa" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Significant
changes in the contract assets balances during the period were as follows:&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span id="xdx_8B0_zpqBHf41XgX6" 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="display: none; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left; padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td id="xdx_497_20220501__20220731_zTAh4pcPdt65" style="border-bottom: Black 1.5pt solid; text-align: right"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom"&gt;
    &lt;td&gt;&#160;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;Three months ended&lt;br/&gt;
 July 31, 2022&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"&gt;(in thousands)&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_408_eus-gaap--ContractWithCustomerAssetNet_iNE_pn3n3_di_z9UGZipIuIoi" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="width: 78%; text-align: left"&gt;Transferred to receivables from contract assets recognized at the beginning of the period&lt;/td&gt;&lt;td style="width: 2%"&gt;&#160;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;$&lt;/td&gt;&lt;td style="width: 18%; text-align: right"&gt;(434&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;)&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40B_ecustom--RevenueRecognizedAndNotBilledAsOfEndOfPeriod_pn3n3_zwGWDLzWlDv3" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left; padding-bottom: 1.5pt"&gt;Revenue recognized and not billed as of the end of the period&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; text-align: right"&gt;714&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_405_ecustom--IncreaseDecreaseInContractWithCustomerAssets_iT_pn3n3_zr4dZmf5FGIk" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left; padding-bottom: 2.5pt"&gt;Net change in contract assets&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;$&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; text-align: right"&gt;280&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 style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"&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; text-align: center; margin-top: 0pt; margin-bottom: 0pt"&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-top: 0pt; margin-bottom: 0pt; margin-left: 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;i&gt;Contract
Liabilities&lt;/i&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Contract
liabilities consist of amounts invoiced to customers in excess of revenue recognized. The decrease in contract liabilities is primarily
due to payment for MAR projects during the three months ended July 31, 2022 for which we have not recognized revenue.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Significant
changes in the contract liabilities balances during the period are as follows:&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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; border-collapse: collapse; width: 100%"&gt;
  &lt;tr style="display: none; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left; padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td id="xdx_493_20220501__20220731_zKRA53S5Vu71" style="border-bottom: Black 1.5pt solid; text-align: right"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom"&gt;
    &lt;td&gt;&#160;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;Three months ended &lt;br/&gt;
July 31, 2022&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="text-align: center"&gt;(in thousands)&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="text-align: right"&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_401_eus-gaap--ContractWithCustomerLiability_iNE_pn3n3_di_zFWRjaSiqv3" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="width: 78%; text-align: left"&gt;Revenue recognized that was included in the contract liabilities balance as of the beginning of the period&lt;/td&gt;&lt;td style="width: 2%"&gt;&#160;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;$&lt;/td&gt;&lt;td style="width: 18%; text-align: right"&gt;(91&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;)&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_400_ecustom--PaymentsCollectedForWhichRevenueHasNotBeenRecognized_pn3n3_zbm3Bj8xL912" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left; padding-bottom: 1.5pt"&gt;Payments collected for which revenue has not been recognized&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; text-align: right"&gt;63&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40E_eus-gaap--IncreaseDecreaseInContractWithCustomerLiability_iT_pn3n3_z3CZYwu3vCo2" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left; padding-bottom: 2.5pt"&gt;Net change in contract liabilities&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;$&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; text-align: right"&gt;(28&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;)&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

</us-gaap:ContractWithCustomerAssetAndLiabilityTableTextBlock>
    <us-gaap:ContractWithCustomerAssetNet contextRef="AsOf2022-07-31" decimals="-3" unitRef="USD">434000</us-gaap:ContractWithCustomerAssetNet>
    <OPTT:RevenueRecognizedAndNotBilledAsOfEndOfPeriod
      contextRef="From2022-05-01to2022-07-31"
      decimals="-3"
      unitRef="USD">714000</OPTT:RevenueRecognizedAndNotBilledAsOfEndOfPeriod>
    <OPTT:IncreaseDecreaseInContractWithCustomerAssets
      contextRef="From2022-05-01to2022-07-31"
      decimals="-3"
      unitRef="USD">280000</OPTT:IncreaseDecreaseInContractWithCustomerAssets>
    <us-gaap:ContractWithCustomerLiability contextRef="AsOf2022-07-31" decimals="-3" unitRef="USD">91000</us-gaap:ContractWithCustomerLiability>
    <OPTT:PaymentsCollectedForWhichRevenueHasNotBeenRecognized
      contextRef="From2022-05-01to2022-07-31"
      decimals="-3"
      unitRef="USD">63000</OPTT:PaymentsCollectedForWhichRevenueHasNotBeenRecognized>
    <us-gaap:IncreaseDecreaseInContractWithCustomerLiability
      contextRef="From2022-05-01to2022-07-31"
      decimals="-3"
      unitRef="USD">-28000</us-gaap:IncreaseDecreaseInContractWithCustomerLiability>
    <us-gaap:InventoryDisclosureTextBlock contextRef="From2022-05-01to2022-07-31">&lt;p id="xdx_804_eus-gaap--InventoryDisclosureTextBlock_z0YtUOzOSBy4" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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_822_zW9Kh4f7mV7h"&gt;Inventory&lt;/span&gt;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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_899_eus-gaap--ScheduleOfInventoryCurrentTableTextBlock_zQIsDWhTKvGc" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;The
Company holds inventory related to the production of its WAM-V&#xae; and PowerBuoy&#xae; products.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"&gt;&lt;span id="xdx_8B1_zOqubA4p26kb" style="display: none"&gt;Schedule of Inventory&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="display: none; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left; padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td id="xdx_492_20220731_z78Mo00wa70b" style="border-bottom: Black 1.5pt solid; text-align: right"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td id="xdx_49C_20220430_zHWZD0U8YmHh" style="border-bottom: Black 1.5pt solid; text-align: right"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom"&gt;
    &lt;td&gt;&#160;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;July 31, 2022&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&#160;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;April 30, 2022&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td colspan="6" style="text-align: center"&gt;(in thousands)&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40E_eus-gaap--InventoryRawMaterials_iI_pn3n3_zljOVoIV41f" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="width: 60%; text-align: left"&gt;Raw Materials&lt;/td&gt;&lt;td style="width: 2%"&gt;&#160;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;$&lt;/td&gt;&lt;td style="width: 16%; text-align: right"&gt;343&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="width: 2%"&gt;&#160;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;$&lt;/td&gt;&lt;td style="width: 16%; text-align: right"&gt;198&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_403_eus-gaap--InventoryWorkInProcess_iI_pn3n3_zCyFzgWRc2o4" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left; padding-bottom: 1.5pt"&gt;Work in Process&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; text-align: right"&gt;245&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; text-align: right"&gt;244&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_400_eus-gaap--InventoryNet_iI_pn3n3_zs9qmpRx1Alj" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="display: none; font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Inventory, net&lt;/span&gt;&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;$&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; text-align: right"&gt;588&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;$&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; text-align: right"&gt;442&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_8A5_zY10rLRcNe48" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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:InventoryDisclosureTextBlock>
    <us-gaap:ScheduleOfInventoryCurrentTableTextBlock contextRef="From2022-05-01to2022-07-31">&lt;p id="xdx_899_eus-gaap--ScheduleOfInventoryCurrentTableTextBlock_zQIsDWhTKvGc" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;The
Company holds inventory related to the production of its WAM-V&#xae; and PowerBuoy&#xae; products.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"&gt;&lt;span id="xdx_8B1_zOqubA4p26kb" style="display: none"&gt;Schedule of Inventory&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="display: none; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left; padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td id="xdx_492_20220731_z78Mo00wa70b" style="border-bottom: Black 1.5pt solid; text-align: right"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td id="xdx_49C_20220430_zHWZD0U8YmHh" style="border-bottom: Black 1.5pt solid; text-align: right"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom"&gt;
    &lt;td&gt;&#160;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;July 31, 2022&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&#160;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;April 30, 2022&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td colspan="6" style="text-align: center"&gt;(in thousands)&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40E_eus-gaap--InventoryRawMaterials_iI_pn3n3_zljOVoIV41f" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="width: 60%; text-align: left"&gt;Raw Materials&lt;/td&gt;&lt;td style="width: 2%"&gt;&#160;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;$&lt;/td&gt;&lt;td style="width: 16%; text-align: right"&gt;343&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="width: 2%"&gt;&#160;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;$&lt;/td&gt;&lt;td style="width: 16%; text-align: right"&gt;198&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_403_eus-gaap--InventoryWorkInProcess_iI_pn3n3_zCyFzgWRc2o4" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left; padding-bottom: 1.5pt"&gt;Work in Process&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; text-align: right"&gt;245&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; text-align: right"&gt;244&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_400_eus-gaap--InventoryNet_iI_pn3n3_zs9qmpRx1Alj" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="display: none; font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Inventory, net&lt;/span&gt;&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;$&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; text-align: right"&gt;588&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;$&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; text-align: right"&gt;442&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:ScheduleOfInventoryCurrentTableTextBlock>
    <us-gaap:InventoryRawMaterials contextRef="AsOf2022-07-31" decimals="-3" unitRef="USD">343000</us-gaap:InventoryRawMaterials>
    <us-gaap:InventoryRawMaterials contextRef="AsOf2022-04-30" decimals="-3" unitRef="USD">198000</us-gaap:InventoryRawMaterials>
    <us-gaap:InventoryWorkInProcess contextRef="AsOf2022-07-31" decimals="-3" unitRef="USD">245000</us-gaap:InventoryWorkInProcess>
    <us-gaap:InventoryWorkInProcess contextRef="AsOf2022-04-30" decimals="-3" unitRef="USD">244000</us-gaap:InventoryWorkInProcess>
    <us-gaap:InventoryNet contextRef="AsOf2022-07-31" decimals="-3" unitRef="USD">588000</us-gaap:InventoryNet>
    <us-gaap:InventoryNet contextRef="AsOf2022-04-30" decimals="-3" unitRef="USD">442000</us-gaap:InventoryNet>
    <us-gaap:OtherCurrentAssetsTextBlock contextRef="From2022-05-01to2022-07-31">&lt;p id="xdx_801_eus-gaap--OtherCurrentAssetsTextBlock_zbO8TevmB3f8" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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_822_zwei4eI66xs5"&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-top: 0pt; margin-bottom: 0pt; margin-left: 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_89C_eus-gaap--ScheduleOfOtherCurrentAssetsTableTextBlock_z4UEzqgKoUqh" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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 July 31, 2022 and April 30, 2022:&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"&gt;&lt;span id="xdx_8B8_ztn9j7Q0lks1" style="display: none"&gt;Schedule of Other Current Assets&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="display: none; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left"&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 id="xdx_493_20220731_zdzPESDBkpG5" style="text-align: right"&gt;&#160;&lt;/td&gt;&lt;td style="text-align: left"&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 id="xdx_49C_20220430_zj0CFcmg5lS6" 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"&gt;
    &lt;td&gt;&#160;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;July 31, 2022&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&#160;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;April 30, 2022&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td colspan="6" style="text-align: center"&gt;(in thousands)&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_407_eus-gaap--PrepaidInsurance_iI_pn3n3_maOACz300_zDrVvpRWbECk" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="width: 60%; text-align: left"&gt;Prepaid insurance&lt;/td&gt;&lt;td style="width: 2%"&gt;&#160;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;$&lt;/td&gt;&lt;td style="width: 16%; text-align: right"&gt;97&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="width: 2%"&gt;&#160;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;$&lt;/td&gt;&lt;td style="width: 16%; text-align: right"&gt;182&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40A_ecustom--PrepaidSoftwareAndLicenses_pn3n3_maOACz300_z9sSDuFzQABf" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left"&gt;Prepaid software &amp;amp; licenses&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;101&lt;/td&gt;&lt;td style="text-align: left"&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;127&lt;/td&gt;&lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40B_ecustom--PrepaidSalesAndMarketing_pn3n3_maOACz300_zTrhvl8U9eHi" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left"&gt;Prepaid sales &amp;amp; marketing&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;91&lt;/td&gt;&lt;td style="text-align: left"&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;50&lt;/td&gt;&lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40B_eus-gaap--OtherReceivablesNetCurrent_iI_pn3n3_maOACz300_zT6uNKJfIedi" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left"&gt;Other receivables&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;91&lt;/td&gt;&lt;td style="text-align: left"&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;24&lt;/td&gt;&lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40B_eus-gaap--OtherPrepaidExpenseCurrent_iI_pn3n3_maOACz300_zY4W9blhZfM8" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left; padding-bottom: 1.5pt"&gt;Prepaid expenses- other&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; text-align: right"&gt;100&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; text-align: right"&gt;84&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40C_eus-gaap--OtherAssetsCurrent_iTI_pn3n3_mtOACz300_zYQ1rpN21yAe" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="display: none; font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Total other current assets&lt;/span&gt;&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;$&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; text-align: right"&gt;480&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;$&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; text-align: right"&gt;467&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_z2a6QvC7IKoh" style="font: 10pt Times New Roman, Times, Serif; text-align: center; margin-top: 0pt; margin-bottom: 0pt"&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; text-align: center; margin-top: 0pt; margin-bottom: 0pt"&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:OtherCurrentAssetsTextBlock>
    <us-gaap:ScheduleOfOtherCurrentAssetsTableTextBlock contextRef="From2022-05-01to2022-07-31">&lt;p id="xdx_89C_eus-gaap--ScheduleOfOtherCurrentAssetsTableTextBlock_z4UEzqgKoUqh" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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 July 31, 2022 and April 30, 2022:&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"&gt;&lt;span id="xdx_8B8_ztn9j7Q0lks1" style="display: none"&gt;Schedule of Other Current Assets&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="display: none; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left"&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 id="xdx_493_20220731_zdzPESDBkpG5" style="text-align: right"&gt;&#160;&lt;/td&gt;&lt;td style="text-align: left"&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 id="xdx_49C_20220430_zj0CFcmg5lS6" 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"&gt;
    &lt;td&gt;&#160;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;July 31, 2022&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&#160;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;April 30, 2022&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td colspan="6" style="text-align: center"&gt;(in thousands)&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_407_eus-gaap--PrepaidInsurance_iI_pn3n3_maOACz300_zDrVvpRWbECk" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="width: 60%; text-align: left"&gt;Prepaid insurance&lt;/td&gt;&lt;td style="width: 2%"&gt;&#160;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;$&lt;/td&gt;&lt;td style="width: 16%; text-align: right"&gt;97&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="width: 2%"&gt;&#160;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;$&lt;/td&gt;&lt;td style="width: 16%; text-align: right"&gt;182&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40A_ecustom--PrepaidSoftwareAndLicenses_pn3n3_maOACz300_z9sSDuFzQABf" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left"&gt;Prepaid software &amp;amp; licenses&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;101&lt;/td&gt;&lt;td style="text-align: left"&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;127&lt;/td&gt;&lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40B_ecustom--PrepaidSalesAndMarketing_pn3n3_maOACz300_zTrhvl8U9eHi" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left"&gt;Prepaid sales &amp;amp; marketing&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;91&lt;/td&gt;&lt;td style="text-align: left"&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;50&lt;/td&gt;&lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40B_eus-gaap--OtherReceivablesNetCurrent_iI_pn3n3_maOACz300_zT6uNKJfIedi" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left"&gt;Other receivables&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;91&lt;/td&gt;&lt;td style="text-align: left"&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;24&lt;/td&gt;&lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40B_eus-gaap--OtherPrepaidExpenseCurrent_iI_pn3n3_maOACz300_zY4W9blhZfM8" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left; padding-bottom: 1.5pt"&gt;Prepaid expenses- other&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; text-align: right"&gt;100&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; text-align: right"&gt;84&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40C_eus-gaap--OtherAssetsCurrent_iTI_pn3n3_mtOACz300_zYQ1rpN21yAe" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="display: none; font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Total other current assets&lt;/span&gt;&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;$&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; text-align: right"&gt;480&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;$&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; text-align: right"&gt;467&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:ScheduleOfOtherCurrentAssetsTableTextBlock>
    <us-gaap:PrepaidInsurance contextRef="AsOf2022-07-31" decimals="-3" unitRef="USD">97000</us-gaap:PrepaidInsurance>
    <us-gaap:PrepaidInsurance contextRef="AsOf2022-04-30" decimals="-3" unitRef="USD">182000</us-gaap:PrepaidInsurance>
    <OPTT:PrepaidSoftwareAndLicenses contextRef="AsOf2022-07-31" decimals="-3" unitRef="USD">101000</OPTT:PrepaidSoftwareAndLicenses>
    <OPTT:PrepaidSoftwareAndLicenses contextRef="AsOf2022-04-30" decimals="-3" unitRef="USD">127000</OPTT:PrepaidSoftwareAndLicenses>
    <OPTT:PrepaidSalesAndMarketing contextRef="AsOf2022-07-31" decimals="-3" unitRef="USD">91000</OPTT:PrepaidSalesAndMarketing>
    <OPTT:PrepaidSalesAndMarketing contextRef="AsOf2022-04-30" decimals="-3" unitRef="USD">50000</OPTT:PrepaidSalesAndMarketing>
    <us-gaap:OtherReceivablesNetCurrent contextRef="AsOf2022-07-31" decimals="-3" unitRef="USD">91000</us-gaap:OtherReceivablesNetCurrent>
    <us-gaap:OtherReceivablesNetCurrent contextRef="AsOf2022-04-30" decimals="-3" unitRef="USD">24000</us-gaap:OtherReceivablesNetCurrent>
    <us-gaap:OtherPrepaidExpenseCurrent contextRef="AsOf2022-07-31" decimals="-3" unitRef="USD">100000</us-gaap:OtherPrepaidExpenseCurrent>
    <us-gaap:OtherPrepaidExpenseCurrent contextRef="AsOf2022-04-30" decimals="-3" unitRef="USD">84000</us-gaap:OtherPrepaidExpenseCurrent>
    <us-gaap:OtherAssetsCurrent contextRef="AsOf2022-07-31" decimals="-3" unitRef="USD">480000</us-gaap:OtherAssetsCurrent>
    <us-gaap:OtherAssetsCurrent contextRef="AsOf2022-04-30" decimals="-3" unitRef="USD">467000</us-gaap:OtherAssetsCurrent>
    <us-gaap:PropertyPlantAndEquipmentDisclosureTextBlock contextRef="From2022-05-01to2022-07-31">&lt;p id="xdx_803_eus-gaap--PropertyPlantAndEquipmentDisclosureTextBlock_zOyb4TTPICj1" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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_820_z8r0xGu0VFWb"&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-top: 0pt; margin-bottom: 0pt; margin-left: 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_894_eus-gaap--PropertyPlantAndEquipmentTextBlock_zxlhGehTRLG1" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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 July 31, 2022 and April 30, 2022 consisted of the following:&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"&gt;&lt;span id="xdx_8BB_zJcUP3T9ROFf" style="display: none"&gt;Schedule of Components of Property and Equipment&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="display: none; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left"&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 id="xdx_495_20220731_zucZSzWzrs26" style="text-align: right"&gt;&#160;&lt;/td&gt;&lt;td style="text-align: left"&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 id="xdx_498_20220430_zjSo9MLnuozb" 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"&gt;
    &lt;td&gt;&#160;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;July 31, 2022&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&#160;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;April 30, 2022&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td colspan="6" style="text-align: center"&gt;(in thousands)&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40D_eus-gaap--PropertyPlantAndEquipmentGross_iI_pn3n3_hus-gaap--PropertyPlantAndEquipmentByTypeAxis__us-gaap--EquipmentMember_zp6GfnfGKGel" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="width: 60%"&gt;Equipment&lt;/td&gt;&lt;td style="width: 2%"&gt;&#160;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;$&lt;/td&gt;&lt;td style="width: 16%; text-align: right"&gt;626&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="width: 2%"&gt;&#160;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;$&lt;/td&gt;&lt;td style="width: 16%; text-align: right"&gt;615&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_402_eus-gaap--PropertyPlantAndEquipmentGross_iI_pn3n3_hus-gaap--PropertyPlantAndEquipmentByTypeAxis__custom--ComputerEquipmentAndSoftwareMember_zYF0b9ahphlg" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left"&gt;Computer equipment &amp;amp; software&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;590&lt;/td&gt;&lt;td style="text-align: left"&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;571&lt;/td&gt;&lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40A_eus-gaap--PropertyPlantAndEquipmentGross_iI_pn3n3_hus-gaap--PropertyPlantAndEquipmentByTypeAxis__custom--OfficeFurnitureAndEquipmentMember_zGdRlMxds6Pk" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left"&gt;Office furniture &amp;amp; equipment&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;352&lt;/td&gt;&lt;td style="text-align: left"&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;352&lt;/td&gt;&lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_400_eus-gaap--PropertyPlantAndEquipmentGross_iI_pn3n3_hus-gaap--PropertyPlantAndEquipmentByTypeAxis__us-gaap--LeaseholdImprovementsMember_zDKuVQhHy9Z3" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left"&gt;Leasehold improvements&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;503&lt;/td&gt;&lt;td style="text-align: left"&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;477&lt;/td&gt;&lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_404_eus-gaap--PropertyPlantAndEquipmentGross_iI_pn3n3_hus-gaap--PropertyPlantAndEquipmentByTypeAxis__us-gaap--ConstructionInProgressMember_zuJv4wPFuIka" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left; padding-bottom: 1.5pt"&gt;Construction in process&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; text-align: right"&gt;15&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; text-align: right"&gt;15&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_407_eus-gaap--PropertyPlantAndEquipmentGross_iI_pn3n3_maPPAENzI8F_zk2rQdmiaA99" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td&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&gt;&#160;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="text-align: right"&gt;2,086&lt;/td&gt;&lt;td style="text-align: left"&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;2,030&lt;/td&gt;&lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_401_eus-gaap--AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_iNI_pn3n3_di_msPPAENzI8F_z5z154W8fi1l" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left; padding-bottom: 1.5pt"&gt;Less: accumulated depreciation&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; text-align: right"&gt;(1,628&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;)&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; text-align: right"&gt;(1,585&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;)&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_406_eus-gaap--PropertyPlantAndEquipmentNet_iTI_pn3n3_mtPPAENzI8F_z1i3CgC1Y2fa" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="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="padding-bottom: 2.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;$&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; text-align: right"&gt;458&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;$&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; text-align: right"&gt;445&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_z01grGmxzCuk" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"&gt;&#160;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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_901_eus-gaap--Depreciation_c20220501__20220731_zNPtLqpVt4R1" title="Depreciation expense"&gt;43,000&lt;/span&gt; and $&lt;span id="xdx_90A_eus-gaap--Depreciation_c20210501__20210731_z3eoV8Xa39Yi" title="Depreciation expense"&gt;40,000&lt;/span&gt; for the three-month periods ended July 31, 2022 and 2021, respectively.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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="From2022-05-01to2022-07-31">&lt;p id="xdx_894_eus-gaap--PropertyPlantAndEquipmentTextBlock_zxlhGehTRLG1" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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 July 31, 2022 and April 30, 2022 consisted of the following:&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"&gt;&lt;span id="xdx_8BB_zJcUP3T9ROFf" style="display: none"&gt;Schedule of Components of Property and Equipment&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="display: none; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left"&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 id="xdx_495_20220731_zucZSzWzrs26" style="text-align: right"&gt;&#160;&lt;/td&gt;&lt;td style="text-align: left"&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 id="xdx_498_20220430_zjSo9MLnuozb" 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"&gt;
    &lt;td&gt;&#160;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;July 31, 2022&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&#160;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;April 30, 2022&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td colspan="6" style="text-align: center"&gt;(in thousands)&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40D_eus-gaap--PropertyPlantAndEquipmentGross_iI_pn3n3_hus-gaap--PropertyPlantAndEquipmentByTypeAxis__us-gaap--EquipmentMember_zp6GfnfGKGel" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="width: 60%"&gt;Equipment&lt;/td&gt;&lt;td style="width: 2%"&gt;&#160;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;$&lt;/td&gt;&lt;td style="width: 16%; text-align: right"&gt;626&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="width: 2%"&gt;&#160;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;$&lt;/td&gt;&lt;td style="width: 16%; text-align: right"&gt;615&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_402_eus-gaap--PropertyPlantAndEquipmentGross_iI_pn3n3_hus-gaap--PropertyPlantAndEquipmentByTypeAxis__custom--ComputerEquipmentAndSoftwareMember_zYF0b9ahphlg" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left"&gt;Computer equipment &amp;amp; software&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;590&lt;/td&gt;&lt;td style="text-align: left"&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;571&lt;/td&gt;&lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40A_eus-gaap--PropertyPlantAndEquipmentGross_iI_pn3n3_hus-gaap--PropertyPlantAndEquipmentByTypeAxis__custom--OfficeFurnitureAndEquipmentMember_zGdRlMxds6Pk" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left"&gt;Office furniture &amp;amp; equipment&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;352&lt;/td&gt;&lt;td style="text-align: left"&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;352&lt;/td&gt;&lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_400_eus-gaap--PropertyPlantAndEquipmentGross_iI_pn3n3_hus-gaap--PropertyPlantAndEquipmentByTypeAxis__us-gaap--LeaseholdImprovementsMember_zDKuVQhHy9Z3" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left"&gt;Leasehold improvements&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;503&lt;/td&gt;&lt;td style="text-align: left"&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;477&lt;/td&gt;&lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_404_eus-gaap--PropertyPlantAndEquipmentGross_iI_pn3n3_hus-gaap--PropertyPlantAndEquipmentByTypeAxis__us-gaap--ConstructionInProgressMember_zuJv4wPFuIka" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left; padding-bottom: 1.5pt"&gt;Construction in process&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; text-align: right"&gt;15&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; text-align: right"&gt;15&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_407_eus-gaap--PropertyPlantAndEquipmentGross_iI_pn3n3_maPPAENzI8F_zk2rQdmiaA99" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td&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&gt;&#160;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="text-align: right"&gt;2,086&lt;/td&gt;&lt;td style="text-align: left"&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;2,030&lt;/td&gt;&lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_401_eus-gaap--AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_iNI_pn3n3_di_msPPAENzI8F_z5z154W8fi1l" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left; padding-bottom: 1.5pt"&gt;Less: accumulated depreciation&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; text-align: right"&gt;(1,628&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;)&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; text-align: right"&gt;(1,585&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;)&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_406_eus-gaap--PropertyPlantAndEquipmentNet_iTI_pn3n3_mtPPAENzI8F_z1i3CgC1Y2fa" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="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="padding-bottom: 2.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;$&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; text-align: right"&gt;458&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;$&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; text-align: right"&gt;445&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:PropertyPlantAndEquipmentTextBlock>
    <us-gaap:PropertyPlantAndEquipmentGross
      contextRef="AsOf2022-07-31_us-gaap_EquipmentMember"
      decimals="-3"
      unitRef="USD">626000</us-gaap:PropertyPlantAndEquipmentGross>
    <us-gaap:PropertyPlantAndEquipmentGross
      contextRef="AsOf2022-04-30_us-gaap_EquipmentMember"
      decimals="-3"
      unitRef="USD">615000</us-gaap:PropertyPlantAndEquipmentGross>
    <us-gaap:PropertyPlantAndEquipmentGross
      contextRef="AsOf2022-07-31_custom_ComputerEquipmentAndSoftwareMember"
      decimals="-3"
      unitRef="USD">590000</us-gaap:PropertyPlantAndEquipmentGross>
    <us-gaap:PropertyPlantAndEquipmentGross
      contextRef="AsOf2022-04-30_custom_ComputerEquipmentAndSoftwareMember"
      decimals="-3"
      unitRef="USD">571000</us-gaap:PropertyPlantAndEquipmentGross>
    <us-gaap:PropertyPlantAndEquipmentGross
      contextRef="AsOf2022-07-31_custom_OfficeFurnitureAndEquipmentMember"
      decimals="-3"
      unitRef="USD">352000</us-gaap:PropertyPlantAndEquipmentGross>
    <us-gaap:PropertyPlantAndEquipmentGross
      contextRef="AsOf2022-04-30_custom_OfficeFurnitureAndEquipmentMember"
      decimals="-3"
      unitRef="USD">352000</us-gaap:PropertyPlantAndEquipmentGross>
    <us-gaap:PropertyPlantAndEquipmentGross
      contextRef="AsOf2022-07-31_us-gaap_LeaseholdImprovementsMember"
      decimals="-3"
      unitRef="USD">503000</us-gaap:PropertyPlantAndEquipmentGross>
    <us-gaap:PropertyPlantAndEquipmentGross
      contextRef="AsOf2022-04-30_us-gaap_LeaseholdImprovementsMember"
      decimals="-3"
      unitRef="USD">477000</us-gaap:PropertyPlantAndEquipmentGross>
    <us-gaap:PropertyPlantAndEquipmentGross
      contextRef="AsOf2022-07-31_us-gaap_ConstructionInProgressMember"
      decimals="-3"
      unitRef="USD">15000</us-gaap:PropertyPlantAndEquipmentGross>
    <us-gaap:PropertyPlantAndEquipmentGross
      contextRef="AsOf2022-04-30_us-gaap_ConstructionInProgressMember"
      decimals="-3"
      unitRef="USD">15000</us-gaap:PropertyPlantAndEquipmentGross>
    <us-gaap:PropertyPlantAndEquipmentGross contextRef="AsOf2022-07-31" decimals="-3" unitRef="USD">2086000</us-gaap:PropertyPlantAndEquipmentGross>
    <us-gaap:PropertyPlantAndEquipmentGross contextRef="AsOf2022-04-30" decimals="-3" unitRef="USD">2030000</us-gaap:PropertyPlantAndEquipmentGross>
    <us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment contextRef="AsOf2022-07-31" decimals="-3" unitRef="USD">1628000</us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment>
    <us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment contextRef="AsOf2022-04-30" decimals="-3" unitRef="USD">1585000</us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment>
    <us-gaap:PropertyPlantAndEquipmentNet contextRef="AsOf2022-07-31" decimals="-3" unitRef="USD">458000</us-gaap:PropertyPlantAndEquipmentNet>
    <us-gaap:PropertyPlantAndEquipmentNet contextRef="AsOf2022-04-30" decimals="-3" unitRef="USD">445000</us-gaap:PropertyPlantAndEquipmentNet>
    <us-gaap:Depreciation
      contextRef="From2022-05-01to2022-07-31"
      decimals="0"
      unitRef="USD">43000</us-gaap:Depreciation>
    <us-gaap:Depreciation
      contextRef="From2021-05-012021-07-31"
      decimals="0"
      unitRef="USD">40000</us-gaap:Depreciation>
    <us-gaap:LesseeOperatingLeasesTextBlock contextRef="From2022-05-01to2022-07-31">&lt;p id="xdx_805_eus-gaap--LesseeOperatingLeasesTextBlock_z7KGcPhmCYbh" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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_828_ziq1h4P1HFS8"&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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"/&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Right-of-use
asset and operating lease liabilities are recognized based on the present value of future 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. The Company only has operating leases for office
facilities and warehouse space. 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.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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_905_eus-gaap--LesseeOperatingLeaseOptionToExtend_c20220501__20220731__srt--StatementGeographicalAxis__custom--MonroeTownshipMember_z56SaAqPZNh3" title="Lessee, operating lease, option to extend"&gt; The
initial lease term is for &lt;span id="xdx_903_eus-gaap--LesseeOperatingLeaseTermOfContract_iI_dc_c20220731__srt--StatementGeographicalAxis__custom--MonroeTownshipMember_zdFmyXRvxZ4h" title="Lessee, operating lease, term of contract"&gt;seven years&lt;/span&gt; which is set to expire 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-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;The
Company also has a lease located in Houston, Texas that was acquired as part of the 3Dent acquisition that is used as office space.
The lease term is for &lt;span id="xdx_907_eus-gaap--LesseeOperatingLeaseTermOfContract_iI_dtY_c20220731__us-gaap--BusinessAcquisitionAxis__custom--ThreeDentAcquisitionMember_zTREMG54V215" title="Lessee, operating lease, term of contract"&gt;3&lt;/span&gt;
years and is set to &lt;span id="xdx_902_eus-gaap--LesseeOperatingLeaseOptionToExtend_c20220501__20220731__us-gaap--BusinessAcquisitionAxis__custom--ThreeDentAcquisitionMember_zAMcsUwkpLXj" title="Lessee, operating lease, option to extend"&gt;expire
in January of 2023&lt;/span&gt;. The lease is classified as an operating lease and included in the right-of-use assets and lease
liabilities- current 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-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;The
Company also has a lease with the University of California Berkeley in Richmond, California that was acquired as part of the MAR acquisition.
The lease expired on &lt;span id="xdx_906_eus-gaap--LeaseExpirationDate1_dd_c20220501__20220731__us-gaap--BusinessAcquisitionAxis__custom--ThreeDentAcquisitionMember_z8QTzY16fAGf" title="Lease expiration date"&gt;June 30, 2022&lt;/span&gt; and the Company is in discussions to renew this lease. As the lease expired prior to renewal, it has
become a month-to-month lease in accordance with the agreement. 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 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-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 0; text-align: justify"&gt;The operating
lease cash flow payments for the three months ended July 31, 2022 and 2021 were $&lt;span id="xdx_90E_eus-gaap--OperatingLeasePayments_c20220501__20220731_ztMWfpOR0Evd"&gt;100,000
&lt;/span&gt;and $&lt;span id="xdx_90B_eus-gaap--OperatingLeasePayments_c20210501__20210731_zf9vy5cV9hwg"&gt;102,000&lt;/span&gt;, respectively.&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"&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; text-align: center; margin-top: 0pt; margin-bottom: 0pt"&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--LeaseCostTableTextBlock_zT71OthNK1j3" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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 Statement of Operations for the three months ended July 31, 2022 and 2021 were as follows:&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span id="xdx_8BD_znWq8iTPtaB8" 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="display: none; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left; padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td id="xdx_49C_20220501__20220731_zCcPtfLOLTn7" style="border-bottom: Black 1.5pt solid; text-align: right"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td id="xdx_495_20210501__20210731_zq9ERG6xerYd" style="border-bottom: Black 1.5pt solid; text-align: right"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom"&gt;
    &lt;td&gt;&#160;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="6" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;Three months ended July 31,&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td&gt;&#160;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;2022&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&#160;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;2021&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td colspan="6" style="text-align: center"&gt;(in thousands)&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_407_eus-gaap--OperatingLeaseCost_pn3n3_maLCzBwM_z51nFWFPhXR" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="width: 60%; text-align: left"&gt;Operating lease cost&lt;/td&gt;&lt;td style="width: 2%"&gt;&#160;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;$&lt;/td&gt;&lt;td style="width: 16%; text-align: right"&gt;92&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="width: 2%"&gt;&#160;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;$&lt;/td&gt;&lt;td style="width: 16%; text-align: right"&gt;92&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_405_eus-gaap--ShortTermLeaseCost_pn3n3_maLCzBwM_z99KvpSHBnZk" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left; padding-bottom: 1.5pt"&gt;Short-term lease cost&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; text-align: right"&gt;8&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; text-align: right"&gt;5&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_401_eus-gaap--LeaseCost_iT_pn3n3_mtLCzBwM_zrbBBu52w8da" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left; padding-bottom: 2.5pt"&gt;Total lease cost&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;$&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; text-align: right"&gt;100&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;$&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; text-align: right"&gt;97&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_8AC_zmizJSU8e0Db" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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_89D_ecustom--ScheduleOfRightofUseAssetsAndLeaseLiabilitiesTableTextBlock_z1ouH9rNEz5i" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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 July 31, 2022 was as follows:&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span id="xdx_8B7_zSm0ZGkHyu48" 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="display: none; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="padding-left: 10pt; text-align: left"&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 id="xdx_490_20220731_zb300GULtnU8" 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"&gt;
    &lt;td&gt;&#160;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;July 31, 2022&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="text-align: center"&gt;(in thousands)&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="text-align: right"&gt;&#160;&lt;/td&gt;&lt;td&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-decoration: underline; text-align: left"&gt;Operating lease:&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 id="xdx_40C_eus-gaap--OperatingLeaseRightOfUseAsset_iI_pn3n3" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="width: 78%; text-align: left; padding-bottom: 2.5pt"&gt;Operating right-of-use asset, net&lt;/td&gt;&lt;td style="width: 2%; padding-bottom: 2.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; width: 1%; text-align: left"&gt;$&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; width: 18%; text-align: right"&gt;677&lt;/td&gt;&lt;td style="width: 1%; padding-bottom: 2.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="text-align: right"&gt;&#160;&lt;/td&gt;&lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40F_eus-gaap--OperatingLeaseLiabilityCurrent_iI_pn3n3_maOLLzIil_zXIAAQEHCHte" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="padding-left: 10pt; text-align: left"&gt;Right-of-use liability- current&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;$&lt;/td&gt;&lt;td style="text-align: right"&gt;328&lt;/td&gt;&lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_403_eus-gaap--OperatingLeaseLiabilityNoncurrent_iI_pn3n3_maOLLzIil_zM19jaTHbubb" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="padding-left: 10pt; text-align: left; padding-bottom: 1.5pt"&gt;Right-of-use liability- long term&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; text-align: right"&gt;446&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_402_eus-gaap--OperatingLeaseLiability_iTI_pn3n3_mtOLLzIil_zw9I5Mw2Jsnh" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left; padding-bottom: 2.5pt"&gt;Total lease liability&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 style="border-bottom: Black 2.5pt double; text-align: right"&gt;774&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; 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;&#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: White"&gt;
    &lt;td style="text-align: left"&gt;Weighted average remaining lease term- operating leases&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;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span id="xdx_905_eus-gaap--OperatingLeaseWeightedAverageRemainingLeaseTerm1_iI_dtY_c20220731_zi0JEV7ibLv1" title="Weighted average remaining lease term- operating leases"&gt;2.15&lt;/span&gt; years&lt;/span&gt;&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;Weighted average discount rate- operating leases&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;&lt;span id="xdx_909_eus-gaap--OperatingLeaseWeightedAverageDiscountRatePercent_iI_pid_dp_uPure_c20220731_z0x168XEjxH4" title="Weighted average discount rate- operating leases"&gt;8.3&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;%&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

&lt;p id="xdx_8AF_z5zPd2xeynj9" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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_z5pFD9dQYgbi" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span id="xdx_8B9_zmD5Qf1s51Ua" 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="display: none; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left"&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 id="xdx_493_20220731_zVrudzp6PSl5" 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"&gt;
    &lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;July 31, 2022&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="text-align: center"&gt;(in thousands)&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="text-align: right"&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40B_eus-gaap--LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_iI_pn3n3_maLOLLPzbOq_zMY9b2Jg3oh1" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="width: 78%; text-align: left"&gt;Remainder of fiscal year 2023&lt;/td&gt;&lt;td style="width: 2%"&gt;&#160;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;$&lt;/td&gt;&lt;td style="width: 18%; text-align: right"&gt;295&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_401_eus-gaap--LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_iI_pn3n3_maLOLLPzbOq_ziYJm2x4JMMi" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left"&gt;2024&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="text-align: right"&gt;362&lt;/td&gt;&lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_403_eus-gaap--LesseeOperatingLeaseLiabilityPaymentsDueYearThree_iI_pn3n3_maLOLLPzbOq_zRPkEiCD2Deh" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left"&gt;2025&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="text-align: right"&gt;184&lt;/td&gt;&lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40C_eus-gaap--LesseeOperatingLeaseLiabilityPaymentsDue_iTI_pn3n3_mtLOLLPzbOq_z07EFdaaN95f" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left"&gt;Total future minimum lease payments&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;$&lt;/td&gt;&lt;td style="text-align: right"&gt;841&lt;/td&gt;&lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_408_eus-gaap--LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_iNI_pn3n3_di_zOAKgVhCCpec" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left; padding-bottom: 1.5pt"&gt;Less imputed interest&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; text-align: right"&gt;(67&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;)&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_401_eus-gaap--OperatingLeaseLiability_iI_pn3n3" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left; padding-bottom: 2.5pt"&gt;Total&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 style="border-bottom: Black 2.5pt double; text-align: right"&gt;774&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 style="font: 10pt Times New Roman, Times, Serif; text-align: center; margin-top: 0pt; margin-bottom: 0pt"&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; text-align: center; margin-top: 0pt; margin-bottom: 0pt"&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:LesseeOperatingLeasesTextBlock>
    <us-gaap:LesseeOperatingLeaseOptionToExtend contextRef="From2022-05-012022-07-31_custom_MonroeTownshipMember">The
initial lease term is for seven years which is set to expire in November of 2024 with
an option to extend the lease for another five years</us-gaap:LesseeOperatingLeaseOptionToExtend>
    <us-gaap:LesseeOperatingLeaseTermOfContract contextRef="AsOf2022-07-31_custom_MonroeTownshipMember">P7Y</us-gaap:LesseeOperatingLeaseTermOfContract>
    <us-gaap:LesseeOperatingLeaseTermOfContract contextRef="AsOf2022-07-31_custom_ThreeDentAcquisitionMember">P3Y</us-gaap:LesseeOperatingLeaseTermOfContract>
    <us-gaap:LesseeOperatingLeaseOptionToExtend contextRef="From2022-05-012022-07-31_custom_ThreeDentAcquisitionMember">expire
in January of 2023</us-gaap:LesseeOperatingLeaseOptionToExtend>
    <us-gaap:LeaseExpirationDate1 contextRef="From2022-05-012022-07-31_custom_ThreeDentAcquisitionMember">2022-06-30</us-gaap:LeaseExpirationDate1>
    <us-gaap:OperatingLeasePayments
      contextRef="From2022-05-01to2022-07-31"
      decimals="0"
      unitRef="USD">100000</us-gaap:OperatingLeasePayments>
    <us-gaap:OperatingLeasePayments
      contextRef="From2021-05-012021-07-31"
      decimals="0"
      unitRef="USD">102000</us-gaap:OperatingLeasePayments>
    <us-gaap:LeaseCostTableTextBlock contextRef="From2022-05-01to2022-07-31">&lt;p id="xdx_89B_eus-gaap--LeaseCostTableTextBlock_zT71OthNK1j3" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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 Statement of Operations for the three months ended July 31, 2022 and 2021 were as follows:&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span id="xdx_8BD_znWq8iTPtaB8" 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="display: none; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left; padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td id="xdx_49C_20220501__20220731_zCcPtfLOLTn7" style="border-bottom: Black 1.5pt solid; text-align: right"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td id="xdx_495_20210501__20210731_zq9ERG6xerYd" style="border-bottom: Black 1.5pt solid; text-align: right"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom"&gt;
    &lt;td&gt;&#160;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="6" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;Three months ended July 31,&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td&gt;&#160;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;2022&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&#160;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;2021&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td colspan="6" style="text-align: center"&gt;(in thousands)&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_407_eus-gaap--OperatingLeaseCost_pn3n3_maLCzBwM_z51nFWFPhXR" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="width: 60%; text-align: left"&gt;Operating lease cost&lt;/td&gt;&lt;td style="width: 2%"&gt;&#160;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;$&lt;/td&gt;&lt;td style="width: 16%; text-align: right"&gt;92&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="width: 2%"&gt;&#160;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;$&lt;/td&gt;&lt;td style="width: 16%; text-align: right"&gt;92&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_405_eus-gaap--ShortTermLeaseCost_pn3n3_maLCzBwM_z99KvpSHBnZk" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left; padding-bottom: 1.5pt"&gt;Short-term lease cost&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; text-align: right"&gt;8&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; text-align: right"&gt;5&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_401_eus-gaap--LeaseCost_iT_pn3n3_mtLCzBwM_zrbBBu52w8da" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left; padding-bottom: 2.5pt"&gt;Total lease cost&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;$&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; text-align: right"&gt;100&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;$&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; text-align: right"&gt;97&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:LeaseCostTableTextBlock>
    <us-gaap:OperatingLeaseCost
      contextRef="From2022-05-01to2022-07-31"
      decimals="-3"
      unitRef="USD">92000</us-gaap:OperatingLeaseCost>
    <us-gaap:OperatingLeaseCost
      contextRef="From2021-05-012021-07-31"
      decimals="-3"
      unitRef="USD">92000</us-gaap:OperatingLeaseCost>
    <us-gaap:ShortTermLeaseCost
      contextRef="From2022-05-01to2022-07-31"
      decimals="-3"
      unitRef="USD">8000</us-gaap:ShortTermLeaseCost>
    <us-gaap:ShortTermLeaseCost
      contextRef="From2021-05-012021-07-31"
      decimals="-3"
      unitRef="USD">5000</us-gaap:ShortTermLeaseCost>
    <us-gaap:LeaseCost
      contextRef="From2022-05-01to2022-07-31"
      decimals="-3"
      unitRef="USD">100000</us-gaap:LeaseCost>
    <us-gaap:LeaseCost
      contextRef="From2021-05-012021-07-31"
      decimals="-3"
      unitRef="USD">97000</us-gaap:LeaseCost>
    <OPTT:ScheduleOfRightofUseAssetsAndLeaseLiabilitiesTableTextBlock contextRef="From2022-05-01to2022-07-31">&lt;p id="xdx_89D_ecustom--ScheduleOfRightofUseAssetsAndLeaseLiabilitiesTableTextBlock_z1ouH9rNEz5i" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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 July 31, 2022 was as follows:&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span id="xdx_8B7_zSm0ZGkHyu48" 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="display: none; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="padding-left: 10pt; text-align: left"&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 id="xdx_490_20220731_zb300GULtnU8" 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"&gt;
    &lt;td&gt;&#160;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;July 31, 2022&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="text-align: center"&gt;(in thousands)&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="text-align: right"&gt;&#160;&lt;/td&gt;&lt;td&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-decoration: underline; text-align: left"&gt;Operating lease:&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 id="xdx_40C_eus-gaap--OperatingLeaseRightOfUseAsset_iI_pn3n3" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="width: 78%; text-align: left; padding-bottom: 2.5pt"&gt;Operating right-of-use asset, net&lt;/td&gt;&lt;td style="width: 2%; padding-bottom: 2.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; width: 1%; text-align: left"&gt;$&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; width: 18%; text-align: right"&gt;677&lt;/td&gt;&lt;td style="width: 1%; padding-bottom: 2.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="text-align: right"&gt;&#160;&lt;/td&gt;&lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40F_eus-gaap--OperatingLeaseLiabilityCurrent_iI_pn3n3_maOLLzIil_zXIAAQEHCHte" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="padding-left: 10pt; text-align: left"&gt;Right-of-use liability- current&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;$&lt;/td&gt;&lt;td style="text-align: right"&gt;328&lt;/td&gt;&lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_403_eus-gaap--OperatingLeaseLiabilityNoncurrent_iI_pn3n3_maOLLzIil_zM19jaTHbubb" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="padding-left: 10pt; text-align: left; padding-bottom: 1.5pt"&gt;Right-of-use liability- long term&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; text-align: right"&gt;446&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_402_eus-gaap--OperatingLeaseLiability_iTI_pn3n3_mtOLLzIil_zw9I5Mw2Jsnh" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left; padding-bottom: 2.5pt"&gt;Total lease liability&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 style="border-bottom: Black 2.5pt double; text-align: right"&gt;774&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; 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;&#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: White"&gt;
    &lt;td style="text-align: left"&gt;Weighted average remaining lease term- operating leases&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;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span id="xdx_905_eus-gaap--OperatingLeaseWeightedAverageRemainingLeaseTerm1_iI_dtY_c20220731_zi0JEV7ibLv1" title="Weighted average remaining lease term- operating leases"&gt;2.15&lt;/span&gt; years&lt;/span&gt;&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;Weighted average discount rate- operating leases&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;&lt;span id="xdx_909_eus-gaap--OperatingLeaseWeightedAverageDiscountRatePercent_iI_pid_dp_uPure_c20220731_z0x168XEjxH4" title="Weighted average discount rate- operating leases"&gt;8.3&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;%&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

</OPTT:ScheduleOfRightofUseAssetsAndLeaseLiabilitiesTableTextBlock>
    <us-gaap:OperatingLeaseRightOfUseAsset contextRef="AsOf2022-07-31" decimals="-3" unitRef="USD">677000</us-gaap:OperatingLeaseRightOfUseAsset>
    <us-gaap:OperatingLeaseLiabilityCurrent contextRef="AsOf2022-07-31" decimals="-3" unitRef="USD">328000</us-gaap:OperatingLeaseLiabilityCurrent>
    <us-gaap:OperatingLeaseLiabilityNoncurrent contextRef="AsOf2022-07-31" decimals="-3" unitRef="USD">446000</us-gaap:OperatingLeaseLiabilityNoncurrent>
    <us-gaap:OperatingLeaseLiability contextRef="AsOf2022-07-31" decimals="-3" unitRef="USD">774000</us-gaap:OperatingLeaseLiability>
    <us-gaap:OperatingLeaseWeightedAverageRemainingLeaseTerm1 contextRef="AsOf2022-07-31">P2Y1M24D</us-gaap:OperatingLeaseWeightedAverageRemainingLeaseTerm1>
    <us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent contextRef="AsOf2022-07-31" decimals="INF" unitRef="Pure">0.083</us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent>
    <us-gaap:LesseeOperatingLeaseLiabilityMaturityTableTextBlock contextRef="From2022-05-01to2022-07-31">&lt;p id="xdx_89F_eus-gaap--LesseeOperatingLeaseLiabilityMaturityTableTextBlock_z5pFD9dQYgbi" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span id="xdx_8B9_zmD5Qf1s51Ua" 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="display: none; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left"&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 id="xdx_493_20220731_zVrudzp6PSl5" 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"&gt;
    &lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;July 31, 2022&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="text-align: center"&gt;(in thousands)&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="text-align: right"&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40B_eus-gaap--LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_iI_pn3n3_maLOLLPzbOq_zMY9b2Jg3oh1" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="width: 78%; text-align: left"&gt;Remainder of fiscal year 2023&lt;/td&gt;&lt;td style="width: 2%"&gt;&#160;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;$&lt;/td&gt;&lt;td style="width: 18%; text-align: right"&gt;295&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_401_eus-gaap--LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_iI_pn3n3_maLOLLPzbOq_ziYJm2x4JMMi" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left"&gt;2024&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="text-align: right"&gt;362&lt;/td&gt;&lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_403_eus-gaap--LesseeOperatingLeaseLiabilityPaymentsDueYearThree_iI_pn3n3_maLOLLPzbOq_zRPkEiCD2Deh" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left"&gt;2025&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="text-align: right"&gt;184&lt;/td&gt;&lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40C_eus-gaap--LesseeOperatingLeaseLiabilityPaymentsDue_iTI_pn3n3_mtLOLLPzbOq_z07EFdaaN95f" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left"&gt;Total future minimum lease payments&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;$&lt;/td&gt;&lt;td style="text-align: right"&gt;841&lt;/td&gt;&lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_408_eus-gaap--LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_iNI_pn3n3_di_zOAKgVhCCpec" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left; padding-bottom: 1.5pt"&gt;Less imputed interest&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; text-align: right"&gt;(67&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;)&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_401_eus-gaap--OperatingLeaseLiability_iI_pn3n3" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left; padding-bottom: 2.5pt"&gt;Total&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 style="border-bottom: Black 2.5pt double; text-align: right"&gt;774&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 style="font: 10pt Times New Roman, Times, Serif; text-align: center; margin-top: 0pt; margin-bottom: 0pt"&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; text-align: center; margin-top: 0pt; margin-bottom: 0pt"&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;

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    <us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths contextRef="AsOf2022-07-31" decimals="-3" unitRef="USD">295000</us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths>
    <us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo contextRef="AsOf2022-07-31" decimals="-3" unitRef="USD">362000</us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo>
    <us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree contextRef="AsOf2022-07-31" decimals="-3" unitRef="USD">184000</us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree>
    <us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue contextRef="AsOf2022-07-31" decimals="-3" unitRef="USD">841000</us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue>
    <us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount contextRef="AsOf2022-07-31" decimals="-3" unitRef="USD">67000</us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount>
    <us-gaap:OperatingLeaseLiability contextRef="AsOf2022-07-31" decimals="-3" unitRef="USD">774000</us-gaap:OperatingLeaseLiability>
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&lt;span id="xdx_823_zrv1PlAq6GTk"&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-top: 0pt; margin-bottom: 0pt; margin-left: 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_893_eus-gaap--ScheduleOfAccruedLiabilitiesTableTextBlock_zN7qwdIhZfdk" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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 July 31, 2022 and April 30, 2022:&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;span id="xdx_8B2_zN41mf7hFlB" 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="vertical-align: bottom"&gt;
    &lt;td&gt;&#160;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_49D_20220731_zatzsPjeesRg" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;July 31, 2022&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&#160;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_490_20220430_z8v6QilMtOjf" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;April 30, 2022&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="text-align: center"&gt;(in thousands)&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2"&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40C_eus-gaap--ConstructionPayableCurrent_iI_maCzsTG_zrNzSSbGojxk" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="width: 60%; text-align: left"&gt;Project costs&lt;/td&gt;&lt;td style="width: 2%"&gt;&#160;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;$&lt;/td&gt;&lt;td style="width: 16%; text-align: right"&gt;100&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="width: 2%"&gt;&#160;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;$&lt;/td&gt;&lt;td style="width: 16%; text-align: right"&gt;59&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_408_eus-gaap--LossContingencyAccrualCarryingValueCurrent_iI_maCzsTG_zPqwiyBqqhKc" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left"&gt;Contract loss reserve&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;435&lt;/td&gt;&lt;td style="text-align: left"&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;328&lt;/td&gt;&lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40B_eus-gaap--OtherEmployeeRelatedLiabilitiesCurrent_iI_maCzsTG_zeq5OlRfPSd8" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left"&gt;Employee incentive payments&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;355&lt;/td&gt;&lt;td style="text-align: left"&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;266&lt;/td&gt;&lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40B_eus-gaap--AccruedSalariesCurrent_iI_maCzsTG_zwk3UrLrwvO9" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left"&gt;Accrued salary and benefits&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;31&lt;/td&gt;&lt;td style="text-align: left"&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;60&lt;/td&gt;&lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40F_eus-gaap--AccruedProfessionalFeesCurrent_iI_maCzsTG_z1XdS6IctZDa" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left"&gt;Legal and accounting fees&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;24&lt;/td&gt;&lt;td style="text-align: left"&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;30&lt;/td&gt;&lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40E_eus-gaap--OtherAccruedLiabilitiesCurrent_iI_maCzsTG_zgERaGugdVLe" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="padding-bottom: 1.5pt"&gt;Other&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; text-align: right"&gt;145&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; text-align: right"&gt;134&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40C_eus-gaap--AccruedLiabilitiesCurrent_iTI_mtCzsTG_zpnVl2VqddKd" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="display: none; font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Accrued expenses total&lt;/span&gt;&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;$&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; text-align: right"&gt;1,090&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;$&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; text-align: right"&gt;877&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_8A0_zcr7cDBVl7xi" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0"&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:ScheduleOfAccruedLiabilitiesTableTextBlock contextRef="From2022-05-01to2022-07-31">&lt;p id="xdx_893_eus-gaap--ScheduleOfAccruedLiabilitiesTableTextBlock_zN7qwdIhZfdk" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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 July 31, 2022 and April 30, 2022:&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;span id="xdx_8B2_zN41mf7hFlB" 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="vertical-align: bottom"&gt;
    &lt;td&gt;&#160;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_49D_20220731_zatzsPjeesRg" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;July 31, 2022&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&#160;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_490_20220430_z8v6QilMtOjf" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;April 30, 2022&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="text-align: center"&gt;(in thousands)&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2"&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40C_eus-gaap--ConstructionPayableCurrent_iI_maCzsTG_zrNzSSbGojxk" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="width: 60%; text-align: left"&gt;Project costs&lt;/td&gt;&lt;td style="width: 2%"&gt;&#160;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;$&lt;/td&gt;&lt;td style="width: 16%; text-align: right"&gt;100&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="width: 2%"&gt;&#160;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;$&lt;/td&gt;&lt;td style="width: 16%; text-align: right"&gt;59&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_408_eus-gaap--LossContingencyAccrualCarryingValueCurrent_iI_maCzsTG_zPqwiyBqqhKc" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left"&gt;Contract loss reserve&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;435&lt;/td&gt;&lt;td style="text-align: left"&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;328&lt;/td&gt;&lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40B_eus-gaap--OtherEmployeeRelatedLiabilitiesCurrent_iI_maCzsTG_zeq5OlRfPSd8" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left"&gt;Employee incentive payments&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;355&lt;/td&gt;&lt;td style="text-align: left"&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;266&lt;/td&gt;&lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40B_eus-gaap--AccruedSalariesCurrent_iI_maCzsTG_zwk3UrLrwvO9" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left"&gt;Accrued salary and benefits&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;31&lt;/td&gt;&lt;td style="text-align: left"&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;60&lt;/td&gt;&lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40F_eus-gaap--AccruedProfessionalFeesCurrent_iI_maCzsTG_z1XdS6IctZDa" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left"&gt;Legal and accounting fees&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;24&lt;/td&gt;&lt;td style="text-align: left"&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;30&lt;/td&gt;&lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40E_eus-gaap--OtherAccruedLiabilitiesCurrent_iI_maCzsTG_zgERaGugdVLe" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="padding-bottom: 1.5pt"&gt;Other&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; text-align: right"&gt;145&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; text-align: right"&gt;134&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40C_eus-gaap--AccruedLiabilitiesCurrent_iTI_mtCzsTG_zpnVl2VqddKd" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="display: none; font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Accrued expenses total&lt;/span&gt;&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;$&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; text-align: right"&gt;1,090&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;$&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; text-align: right"&gt;877&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:ScheduleOfAccruedLiabilitiesTableTextBlock>
    <us-gaap:ConstructionPayableCurrent contextRef="AsOf2022-07-31" decimals="-3" unitRef="USD">100000</us-gaap:ConstructionPayableCurrent>
    <us-gaap:ConstructionPayableCurrent contextRef="AsOf2022-04-30" decimals="-3" unitRef="USD">59000</us-gaap:ConstructionPayableCurrent>
    <us-gaap:LossContingencyAccrualCarryingValueCurrent contextRef="AsOf2022-07-31" decimals="-3" unitRef="USD">435000</us-gaap:LossContingencyAccrualCarryingValueCurrent>
    <us-gaap:LossContingencyAccrualCarryingValueCurrent contextRef="AsOf2022-04-30" decimals="-3" unitRef="USD">328000</us-gaap:LossContingencyAccrualCarryingValueCurrent>
    <us-gaap:OtherEmployeeRelatedLiabilitiesCurrent contextRef="AsOf2022-07-31" decimals="-3" unitRef="USD">355000</us-gaap:OtherEmployeeRelatedLiabilitiesCurrent>
    <us-gaap:OtherEmployeeRelatedLiabilitiesCurrent contextRef="AsOf2022-04-30" decimals="-3" unitRef="USD">266000</us-gaap:OtherEmployeeRelatedLiabilitiesCurrent>
    <us-gaap:AccruedSalariesCurrent contextRef="AsOf2022-07-31" decimals="-3" unitRef="USD">31000</us-gaap:AccruedSalariesCurrent>
    <us-gaap:AccruedSalariesCurrent contextRef="AsOf2022-04-30" decimals="-3" unitRef="USD">60000</us-gaap:AccruedSalariesCurrent>
    <us-gaap:AccruedProfessionalFeesCurrent contextRef="AsOf2022-07-31" decimals="-3" unitRef="USD">24000</us-gaap:AccruedProfessionalFeesCurrent>
    <us-gaap:AccruedProfessionalFeesCurrent contextRef="AsOf2022-04-30" decimals="-3" unitRef="USD">30000</us-gaap:AccruedProfessionalFeesCurrent>
    <us-gaap:OtherAccruedLiabilitiesCurrent contextRef="AsOf2022-07-31" decimals="-3" unitRef="USD">145000</us-gaap:OtherAccruedLiabilitiesCurrent>
    <us-gaap:OtherAccruedLiabilitiesCurrent contextRef="AsOf2022-04-30" decimals="-3" unitRef="USD">134000</us-gaap:OtherAccruedLiabilitiesCurrent>
    <us-gaap:AccruedLiabilitiesCurrent contextRef="AsOf2022-07-31" decimals="-3" unitRef="USD">1090000</us-gaap:AccruedLiabilitiesCurrent>
    <us-gaap:AccruedLiabilitiesCurrent contextRef="AsOf2022-04-30" decimals="-3" unitRef="USD">877000</us-gaap:AccruedLiabilitiesCurrent>
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&lt;span id="xdx_82F_zTlbHCi1kbMf"&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-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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_90F_eus-gaap--SaleOfStockNumberOfSharesIssuedInTransaction_pid_c20190407__20190408_zl4XB9pV7eHe" 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_90B_eus-gaap--ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights_iI_pid_c20190408__us-gaap--StatementEquityComponentsAxis__custom--PreFundedWarrantsMember_z30hbdcIPzv" 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_908_eus-gaap--ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights_iI_pid_c20190408__us-gaap--StatementEquityComponentsAxis__custom--CommonWarrantsMember_z4m3hwjCUQQ8" title="Purchase of warrants"&gt;4,927,680&lt;/span&gt; shares of 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_90D_eus-gaap--ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_iI_pid_c20190408__us-gaap--StatementEquityComponentsAxis__custom--PreFundedWarrantsMember_ztgidyQEIcS3"&gt;0.01&lt;/span&gt; per share exercise
price of each warrant. The pre-funded warrants have no expiration date. As of July 31, 2022, all of the pre-funded warrants had been
exercised. The common stock warrants have an exercise price of $&lt;span id="xdx_90D_eus-gaap--ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_iI_pid_c20190408__us-gaap--StatementEquityComponentsAxis__custom--CommonWarrantsMember_zUUNigMvMtph" title="Exercise price of warrants"&gt;3.85&lt;/span&gt; per share and expire &lt;span id="xdx_90F_eus-gaap--WarrantsAndRightsOutstandingTerm_iI_dc_c20190408__us-gaap--StatementEquityComponentsAxis__custom--CommonWarrantsMember_zPjOlQJRMGXk" title="Warrants and rights outstanding, term"&gt;five years&lt;/span&gt; from the issuance date. As of July
31, 2022, warrants to purchase &lt;span id="xdx_908_eus-gaap--ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights_iI_pid_c20220731__us-gaap--StatementEquityComponentsAxis__custom--CommonWarrantsMember_zJMeP3b8xGzf"&gt;732,500&lt;/span&gt; shares of the common stock had been exercised.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;The
Company accounts for warrants 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 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-top: 0pt; margin-bottom: 0pt; margin-left: 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="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:ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
      contextRef="AsOf2022-07-31_custom_CommonWarrantsMember"
      decimals="INF"
      unitRef="Shares">732500</us-gaap:ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights>
    <us-gaap:DebtDisclosureTextBlock contextRef="From2022-05-01to2022-07-31">&lt;p id="xdx_80D_eus-gaap--DebtDisclosureTextBlock_zVzxpQLxZ8Lk" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;(10)
&lt;span id="xdx_82C_zwYtnUH6cHQ"&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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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 $&lt;span id="xdx_90A_eus-gaap--ProceedsFromLoanOriginations1_pp0p0_c20200501__20200503__us-gaap--TypeOfArrangementAxis__custom--PaycheckProtectionProgramMember_zzi6hZl16OZj" title="Proceeds from loan originations"&gt;891,000&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 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-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span id="xdx_903_ecustom--DebtForgivenessDescription_c20200501__20200503__us-gaap--TypeOfArrangementAxis__custom--PaycheckProtectionProgramMember_zEVvDWZWly45" title="Debt forgiveness, description"&gt;The
Company filed its loan forgiveness application at the end of February 2021 asking for &lt;span id="xdx_909_eus-gaap--DebtInstrumentInterestRateStatedPercentage_iI_pid_dp_c20200503__us-gaap--TypeOfArrangementAxis__custom--PaycheckProtectionProgramMember_zhFkAJg8IETa" 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 has now been fully forgiven. The Company recognized a gain
on forgiveness of PPP loan of approximately $&lt;span id="xdx_90F_eus-gaap--RepaymentsOfLongTermDebt_pp0p0_c20210501__20220430__us-gaap--TypeOfArrangementAxis__custom--PaycheckProtectionProgramMember_zb2ahVqIwqwf" title="Repayments of long-term debt"&gt;891,000&lt;/span&gt; during the three months ended July 31, 2021.&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 0"/&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"/&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"&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; text-align: center; margin-top: 0pt; margin-bottom: 0pt"&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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"/&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"/&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"/&gt;&lt;/p&gt;

</us-gaap:DebtDisclosureTextBlock>
    <us-gaap:ProceedsFromLoanOriginations1
      contextRef="From2020-05-012020-05-03_custom_PaycheckProtectionProgramMember"
      decimals="0"
      unitRef="USD">891000</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 has now been fully forgiven. The Company recognized a gain
on forgiveness of PPP loan of approximately $891,000 during the three months ended July 31, 2021.</OPTT:DebtForgivenessDescription>
    <us-gaap:DebtInstrumentInterestRateStatedPercentage
      contextRef="AsOf2020-05-03_custom_PaycheckProtectionProgramMember"
      decimals="INF"
      unitRef="Pure">1</us-gaap:DebtInstrumentInterestRateStatedPercentage>
    <us-gaap:RepaymentsOfLongTermDebt
      contextRef="From2021-05-012022-04-30_custom_PaycheckProtectionProgramMember"
      decimals="0"
      unitRef="USD">891000</us-gaap:RepaymentsOfLongTermDebt>
    <us-gaap:DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock contextRef="From2022-05-01to2022-07-31">&lt;p id="xdx_806_eus-gaap--DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_z3jmsE3bZLC8" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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_828_zprnbRfTQhBi"&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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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_906_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_iI_c20151231__us-gaap--PlanNameAxis__custom--TwoThousandAndFifteenOmnibusIncentivePlanMember_zT4pZ1nj1znl" 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 July 31, 2022, the Company had &lt;span id="xdx_906_eus-gaap--CommonStockCapitalSharesReservedForFutureIssuance_iI_c20220731__us-gaap--PlanNameAxis__custom--TwoThousandAndFifteenOmnibusIncentivePlanMember__srt--TitleOfIndividualAxis__srt--ChiefExecutiveOfficerMember_zKexwLUIALGh" title="Capital shares reserved for future issuance"&gt;695,127&lt;/span&gt; shares available for future issuance under the
2015 Plan.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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_90B_eus-gaap--CommonStockCapitalSharesReservedForFutureIssuance_iI_c20180118__us-gaap--PlanNameAxis__custom--TwoThousandAndEighteenInducementPlanMember_zKNbJHhZO6gh" 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 employees of 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. On
February 9, 2022, the 2018 Inducement Plan was amended to increase the authorized shares by &lt;span id="xdx_907_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_iI_pid_c20220208__us-gaap--PlanNameAxis__custom--TwoThousandAndEighteenInducementPlanMember_zhQpXUkUweo3" title="Share-based compensation arrangement shares authorized"&gt;250,000&lt;/span&gt;
to &lt;span id="xdx_90E_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_iI_pid_c20220209__us-gaap--PlanNameAxis__custom--TwoThousandAndEighteenInducementPlanMember_zXWXom2AxDO2" title="Share-based compensation arrangement shares authorized"&gt;275,000&lt;/span&gt;.
As of July 31, 2022, there were &lt;span id="xdx_90B_eus-gaap--CommonStockCapitalSharesReservedForFutureIssuance_iI_c20220731__us-gaap--PlanNameAxis__custom--TwoThousandAndEighteenInducementPlanMember_zY3BfNow1AL5" title="Capital shares reserved for future issuance"&gt;211,487&lt;/span&gt;
shares available for grant under the 2018 Inducement Plan. The 2015 Plan and the 2018 Inducement Plan together comprise the &#x201c;Stock Incentive Plans&#x201d;.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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 commensurate with the expected life of the award. The expected
life (estimated period of time outstanding) of the stock options granted was 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 did not grant any stock options during the three
months ended July 31, 2022 and 2021.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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_898_eus-gaap--ScheduleOfShareBasedCompensationActivityTableTextBlock_zXERJNdHJhBb" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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_zazJOwN3zBXe" 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="vertical-align: bottom"&gt;
    &lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"&gt;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"&gt;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"&gt;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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="padding-bottom: 1.5pt"&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: 46%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Outstanding as of April 30, 2022&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&#160;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td id="xdx_983_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_iS_pid_c20220501__20220731_z6zdnneCXmd2" style="width: 14%; text-align: right" title="Shares underlying options outstanding, beginning"&gt;1,110,356&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="width: 2%"&gt;&#160;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;$&lt;/td&gt;&lt;td id="xdx_983_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_iS_pid_c20220501__20220731_zsZIQaZx7Wa5" style="width: 14%; text-align: right" title="Weighted average exercise price, beginning balance"&gt;2.34&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="width: 2%"&gt;&#160;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="width: 14%; text-align: right"&gt;&lt;span id="xdx_906_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_dtY_c20220501__20220731_zSPHgAGnRNwg" title="Weighted Average Remaining Contractual Term (In Years), Beginning"&gt;9.2&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Granted&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;td id="xdx_98D_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_pid_c20220501__20220731_z8XSpMDYH7a1" style="text-align: right" title="Shares underlying options outstanding, granted"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0787"&gt;&#x2014;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;$&lt;/td&gt;&lt;td id="xdx_98A_eus-gaap--ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_pid_c20220501__20220731_z3vfmFZPhLpf" style="text-align: right" title="Weighted Average Exercise Price, Granted"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0789"&gt;&#x2014;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&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 style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Exercised&lt;/span&gt;&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_982_eus-gaap--StockIssuedDuringPeriodSharesStockOptionsExercised_iN_pid_di_c20220501__20220731_z6nBa1ZZjQjk" style="text-align: right" title="Shares Underlying Options Outstanding, Exercised"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0791"&gt;&#x2014;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"/&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;$&lt;/td&gt;&lt;td id="xdx_98D_eus-gaap--ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_pid_c20220501__20220731_zQ5jD7AZKA45" style="text-align: right" title="Weighted Average Exercise Price, Exercised"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0793"&gt;&#x2014;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="text-align: right"&gt;&#160;&lt;/td&gt;&lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Cancelled/forfeited&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td id="xdx_984_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod_iN_pid_di_c20220501__20220731_z0HuIxu5h9u2" style="border-bottom: Black 1.5pt solid; text-align: right" title="Shares Underlying Options Outstanding, Cancelled/forfeited"&gt;(37&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;)&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;$&lt;/td&gt;&lt;td id="xdx_98E_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice_pid_c20220501__20220731_z0MfMqqrCUr9" style="padding-bottom: 1.5pt; text-align: right" title="Weighted Average Exercise Price, Cancelled/forfeited"&gt;400.00&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: right"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; 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;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Outstanding as of July 31, 2022&lt;/span&gt;&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;&#160;&lt;/td&gt;&lt;td id="xdx_989_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_iE_pid_c20220501__20220731_zJYs99hW4h3g" style="border-bottom: Black 2.5pt double; text-align: right" title="Shares underlying options outstanding, ending"&gt;1,110,319&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;$&lt;/td&gt;&lt;td id="xdx_98C_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_iE_pid_c20220501__20220731_ztWvIYAN0J" style="padding-bottom: 2.5pt; text-align: right" title="Weighted average exercise price, ending balance"&gt;2.33&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: right"&gt;&lt;span id="xdx_906_ecustom--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm_dtY_c20220501__20220731_zkNmZNRXW6Ka" title="Weighted average remaining contractual term (in years), ending"&gt;8.9&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Exercisable as of July 31, 2022&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td id="xdx_983_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_iI_pid_c20220731_zHth9SNAhVIk" style="border-bottom: Black 2.5pt double; text-align: right" title="Shares underlying options outstanding, exercisable at ending"&gt;297,467&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;$&lt;/td&gt;&lt;td id="xdx_98F_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_iI_pid_c20220731_zj9vLRHLH7hf" style="padding-bottom: 2.5pt; text-align: right" title="Weighted average exercise price, exercisable at ending"&gt;4.60&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: right"&gt;&lt;span id="xdx_909_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_dtY_c20220501__20220731_zjsx83VeahO6" title="Weighted average remaining contractual term (in years), exercisable at ending"&gt;7.6&lt;/span&gt;&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_8AA_zWsymkxdRJo" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"&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; text-align: center; margin-top: 0pt; margin-bottom: 0pt"&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; margin-left: 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;As
of July 31, 2022, the total intrinsic value of outstanding and exercisable options was approximately &lt;span id="xdx_90E_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_iI_pp0p0_do_c20220731__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zPo2NvFQPHz9" title="Intrinsic value of outstanding and exercisable options"&gt;zero&lt;/span&gt;. As of July 31, 2022, approximately
&lt;span id="xdx_905_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares_iI_pid_c20220731__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zsK2op8nLJ8c" title="Options unvested"&gt;813,000&lt;/span&gt; options were unvested, which had an intrinsic value of &lt;span id="xdx_90E_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_iI_pp0p0_do_c20220731__us-gaap--AwardTypeAxis__custom--EmployeeStockOptionOneMember_zB90Xy4P6Yad" 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_90B_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1_dtY_c20220501__20220731__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zfM3oBOF4i2d" title="Weighted average remaining contractual term"&gt;9.4&lt;/span&gt; years. There
was approximately $&lt;span id="xdx_90A_eus-gaap--AllocatedShareBasedCompensationExpense_c20220501__20220731__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zkvfaGzdEjl4" title="Share-based payment arrangement, expense"&gt;96,000 &lt;/span&gt;and $&lt;span id="xdx_90A_eus-gaap--AllocatedShareBasedCompensationExpense_c20210501__20210731__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zXoztFpY7L4" title="Share-based payment arrangement, expense"&gt;110,000&lt;/span&gt; of total recognized compensation cost related to stock options during each of the three months
ended July 31, 2022 and 2021, respectively. As of July 31, 2022, there was approximately $&lt;span id="xdx_902_eus-gaap--EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions_iI_pn5n6_c20220731__us-gaap--AwardTypeAxis__custom--NonVestedStockMember_z7WSfTJNGdN8" title="Unrecognized compensation cost related to non-vested stock"&gt;0.7&lt;/span&gt; million 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_901_eus-gaap--EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_dtY_c20220501__20220731__us-gaap--AwardTypeAxis__custom--NonVestedStockMember_zGjfvs2WUGSd" title="Share-based compensation of weighted-average period"&gt;2.3&lt;/span&gt; years.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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_89D_eus-gaap--ScheduleOfShareBasedCompensationActivityTableTextBlock_hus-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zX3QvoeujmSl" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;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 style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span id="xdx_8BB_zBu4oBuwBouc" 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="vertical-align: bottom"&gt;
    &lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"&gt;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"&gt;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"&gt;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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="padding-bottom: 1.5pt"&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: 46%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Outstanding as of April 30, 2022&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&#160;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td id="xdx_98A_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_iS_pid_c20220501__20220731__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_z9dd8cYa9wVb" style="width: 14%; text-align: right" title="Shares underlying options outstanding, beginning"&gt;210,122&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="width: 2%"&gt;&#160;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;$&lt;/td&gt;&lt;td id="xdx_988_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_iS_pid_c20220501__20220731__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zlcNMioHQsB9" style="width: 14%; text-align: right" title="Weighted average exercise price, beginning balance"&gt;2.20&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="width: 2%"&gt;&#160;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="width: 14%; text-align: right"&gt;&lt;span id="xdx_90A_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_dtY_c20220501__20220731__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zpqMv7wyx0Hk" title="Weighted Average Remaining Contractual Term (In Years), Beginning"&gt;8.8&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Granted&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;td id="xdx_987_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_pid_c20220501__20220731__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_z6q0StxPMAj7" style="text-align: right" title="Shares underlying options outstanding, granted"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0835"&gt;&#x2014;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;$&lt;/td&gt;&lt;td id="xdx_98B_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_pid_c20220501__20220731__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_z4BHaOnXmyfl" style="text-align: right" title="Shares underlying options outstanding, granted"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0837"&gt;&#x2014;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&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 style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Exercised&lt;/span&gt;&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_985_eus-gaap--StockIssuedDuringPeriodSharesStockOptionsExercised_iN_pid_di_c20220501__20220731__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zR5mwSojMHc7" style="text-align: right" title="Shares Underlying Options Outstanding, Exercised"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0839"&gt;&#x2014;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;$&lt;/td&gt;&lt;td id="xdx_984_eus-gaap--ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_pid_c20220501__20220731__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zGhE28bOSKil" style="text-align: right" title="Weighted Average Exercise Price, Exercised"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0841"&gt;&#x2014;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="text-align: right"&gt;&#160;&lt;/td&gt;&lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Cancelled/forfeited&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td id="xdx_987_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod_iN_pid_di_c20220501__20220731__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zSO09qRx9BE4" style="border-bottom: Black 1.5pt solid; text-align: right" title="Shares Underlying Options Outstanding, Cancelled/forfeited"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0843"&gt;&#x2014;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;$&lt;/td&gt;&lt;td id="xdx_98A_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice_pid_c20220501__20220731__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_z3n7cI6hkUki" style="padding-bottom: 1.5pt; text-align: right" title="Weighted Average Exercise Price, Cancelled/forfeited"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0845"&gt;&#x2014;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: right"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; 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;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Outstanding as of July 31, 2022&lt;/span&gt;&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;&#160;&lt;/td&gt;&lt;td id="xdx_982_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_iE_pid_c20220501__20220731__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zu8fb1O5Ixd8" style="border-bottom: Black 2.5pt double; text-align: right" title="Shares underlying options outstanding, ending"&gt;210,122&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;$&lt;/td&gt;&lt;td id="xdx_982_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_iE_pid_c20220501__20220731__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zoOYJSmdK3vh" style="padding-bottom: 2.5pt; text-align: right" title="Weighted average exercise price, ending balance"&gt;2.20&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: right"&gt;&lt;span id="xdx_90C_ecustom--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm_dtY_c20220501__20220731__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zblURCj3N4Ff" title="Weighted Average Remaining Contractual Term (In Years), Ending"&gt;8.6&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; 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: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Exercisable as of July 31, 2022&lt;/span&gt;&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;&#160;&lt;/td&gt;&lt;td id="xdx_982_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_iI_pid_c20220731__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zD7QwVOzyGjh" style="border-bottom: Black 2.5pt double; text-align: right" title="Shares Underlying Options Outstanding, Exercisable at Ending"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0853"&gt;&#x2014;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;$&lt;/td&gt;&lt;td id="xdx_986_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_iI_pid_c20220731__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zvJWpECxI9Ik" style="padding-bottom: 2.5pt; text-align: right" title="Weighted average exercise price, exercisable at ending"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0855"&gt;&#x2014;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: right"&gt;&#160;&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_zh837vUntyq" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 0; text-align: justify"&gt;As of July
31, 2022, approximately &lt;span id="xdx_90D_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares_iI_pid_c20220731__us-gaap--AwardTypeAxis__us-gaap--PerformanceSharesMember_zli5jn4Hl6n5" title="Options, number of shares unvested"&gt;210,000&lt;/span&gt;
options were unvested, which had an intrinsic value of &lt;span id="xdx_90B_ecustom--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsUnvestedOutstandingIntrinsicValue_iI_dc_c20220731__us-gaap--AwardTypeAxis__us-gaap--PerformanceSharesMember_zxqI2FiKrccb" title="Options, outstanding, intrinsic value"&gt;zero&lt;/span&gt;
and
a weighted average remaining contractual term of &lt;span id="xdx_901_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1_dtY_c20220501__20220731__us-gaap--AwardTypeAxis__us-gaap--PerformanceSharesMember_zK8j58puyq1l" title="Weighted average remaining contractual term"&gt;8.6&lt;/span&gt;
years.
There was approximately $&lt;span id="xdx_90B_eus-gaap--AllocatedShareBasedCompensationExpense_c20220501__20220731__us-gaap--AwardTypeAxis__us-gaap--PerformanceSharesMember_zdR34MdaB2v4" title="Recognized compensation cost"&gt;52,500&lt;/span&gt;
and
$&lt;span id="xdx_908_eus-gaap--AllocatedShareBasedCompensationExpense_c20210501__20210731__us-gaap--AwardTypeAxis__us-gaap--PerformanceSharesMember_zdPh7IaAz939" title="Recognized compensation cost"&gt;95,000&lt;/span&gt;
of
total recognized compensation cost related to stock options during the three months ended July 31, 2022 and 2021, respectively. As of
July 31, 2022, there was approximately $&lt;span id="xdx_90C_eus-gaap--EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions_iI_pn5n6_c20220731__us-gaap--AwardTypeAxis__us-gaap--PerformanceSharesMember_zjAqys2MPlCk" title="Unrecognized compensation cost"&gt;0.1
&lt;/span&gt;million
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_90C_eus-gaap--EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_dtY_c20220501__20220731__us-gaap--AwardTypeAxis__us-gaap--PerformanceSharesMember_z5ddSpHVPaw3" title="Share-based compensation of weighted-average period"&gt;0.6
&lt;/span&gt;years.&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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 three months ended July 31, 2022 and 2021, the Company granted &lt;span&gt;&lt;span id="xdx_90E_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_c20220501__20220731_z8nbloO5eat7" title="Number of restricted shares, granted"&gt;51,500&lt;/span&gt; and &lt;span&gt;&lt;span id="xdx_90C_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_dc_c20210501__20210731_zHxhwHgqkMR6" title="Number of restricted shares, granted"&gt;zero&lt;/span&gt;&lt;/span&gt;&lt;/span&gt; shares, 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-top: 0pt; margin-bottom: 0pt; text-align: center"&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; text-align: center; margin-top: 0pt; margin-bottom: 0pt"&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_894_eus-gaap--ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityTableTextBlock_zXhzV3QLufq" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span id="xdx_8BA_zfnAiHlVJ1N8" 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="vertical-align: bottom"&gt;
    &lt;td&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"&gt;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"&gt;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;Average
Price &lt;br/&gt;
per&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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="padding-bottom: 1.5pt"&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: 60%; text-align: left"&gt;Unvested at April 30, 2022&lt;/td&gt;&lt;td style="width: 2%"&gt;&#160;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td id="xdx_988_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_iS_pid_c20220501__20220731__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_z8F9ER2s8fV" style="width: 16%; text-align: right" title="Number of Shares, Unvested, Beginning"&gt;827,764&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="width: 2%"&gt;&#160;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;$&lt;/td&gt;&lt;td id="xdx_981_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_iS_pid_c20220501__20220731__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_zeS3otUL2eO6" style="width: 16%; text-align: right" title="Weighted Average Price per Share, Unvested, Beginning"&gt;1.41&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td&gt;Granted&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;td id="xdx_983_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_pid_c20220501__20220731__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_zXrQarTRni9" style="text-align: right" title="Number of Shares, Unvested, Granted"&gt;51,500&lt;/td&gt;&lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;$&lt;/td&gt;&lt;td id="xdx_984_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_pid_c20220501__20220731__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_zwKiFmztzVO3" style="text-align: right" title="Weighted Average Price per Share, Unvested, Granted"&gt;1.12&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: rgb(204,238,255)"&gt;
    &lt;td&gt;Vested and issued&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_987_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_iN_pid_di_c20220501__20220731__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_zF1erS6FPacd" style="text-align: right" title="Number of Shares, Unvested, Vested and issued"&gt;(16,667&lt;/td&gt;&lt;td style="text-align: left"&gt;)&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;$&lt;/td&gt;&lt;td id="xdx_989_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_pid_c20220501__20220731__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_z0lyVGHJ7yll" style="text-align: right" title="Weighted Average Price per Share, Unvested, Vested"&gt;2.37&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: 1.5pt"&gt;Cancelled/forfeited&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td id="xdx_984_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_iN_pid_di_c20220501__20220731__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_zjXGo2Lej04l" style="border-bottom: Black 1.5pt solid; text-align: right" title="Number of Shares, Unvested, Cancelled/forfeited"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0889"&gt;&#x2014;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: right"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; 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; padding-bottom: 2.5pt"&gt;Unvested at July 31, 2022&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;&#160;&lt;/td&gt;&lt;td id="xdx_981_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_iE_pid_c20220501__20220731__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_zDrOwWfdI1I7" style="border-bottom: Black 2.5pt double; text-align: right" title="Number of Shares, Unvested, Ending"&gt;862,597&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;$&lt;/td&gt;&lt;td id="xdx_98D_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_iE_pid_c20220501__20220731__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_zgHvsBu9eRO5" style="padding-bottom: 2.5pt; text-align: right" title="Weighted Average Price per Share, Unvested, Ending"&gt;1.38&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_8A6_z9yoWlUSdoc1" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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_90C_eus-gaap--AllocatedShareBasedCompensationExpense_pp0p0_c20220501__20220731__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_z7Z7rmvjodid" title="Share-based payment arrangement, expense"&gt;184,000&lt;/span&gt; and $&lt;span id="xdx_907_eus-gaap--AllocatedShareBasedCompensationExpense_pp0p0_c20210501__20210731__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_zgFk8NwjLQzh"&gt;14,000&lt;/span&gt; of total recognized compensation cost related to restricted stock for the three months ended July
31, 2022 and 2021, respectively. As of July 31, 2022, there is approximately $&lt;span id="xdx_90C_eus-gaap--EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_iI_c20220731__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_z8hzhqqf6Bu6" title="Unrecognized compensation cost"&gt;821,067&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 &lt;span id="xdx_90E_eus-gaap--EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_dtY_c20220501__20220731__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_zX3KEAttj48l" title="Share-based compensation of weighted-average period"&gt;1.8&lt;/span&gt; years.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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="AsOf2022-07-31_custom_TwoThousandAndFifteenOmnibusIncentivePlanMember_srt_ChiefExecutiveOfficerMember"
      decimals="INF"
      unitRef="Shares">695127</us-gaap:CommonStockCapitalSharesReservedForFutureIssuance>
    <us-gaap:CommonStockCapitalSharesReservedForFutureIssuance
      contextRef="AsOf2018-01-18_custom_TwoThousandAndEighteenInducementPlanMember"
      decimals="INF"
      unitRef="Shares">25000</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:CommonStockCapitalSharesReservedForFutureIssuance
      contextRef="AsOf2022-07-31_custom_TwoThousandAndEighteenInducementPlanMember"
      decimals="INF"
      unitRef="Shares">211487</us-gaap:CommonStockCapitalSharesReservedForFutureIssuance>
    <us-gaap:ScheduleOfShareBasedCompensationActivityTableTextBlock contextRef="From2022-05-01to2022-07-31">&lt;p id="xdx_898_eus-gaap--ScheduleOfShareBasedCompensationActivityTableTextBlock_zXERJNdHJhBb" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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_zazJOwN3zBXe" 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="vertical-align: bottom"&gt;
    &lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"&gt;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"&gt;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"&gt;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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="padding-bottom: 1.5pt"&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: 46%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Outstanding as of April 30, 2022&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&#160;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td id="xdx_983_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_iS_pid_c20220501__20220731_z6zdnneCXmd2" style="width: 14%; text-align: right" title="Shares underlying options outstanding, beginning"&gt;1,110,356&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="width: 2%"&gt;&#160;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;$&lt;/td&gt;&lt;td id="xdx_983_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_iS_pid_c20220501__20220731_zsZIQaZx7Wa5" style="width: 14%; text-align: right" title="Weighted average exercise price, beginning balance"&gt;2.34&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="width: 2%"&gt;&#160;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="width: 14%; text-align: right"&gt;&lt;span id="xdx_906_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_dtY_c20220501__20220731_zSPHgAGnRNwg" title="Weighted Average Remaining Contractual Term (In Years), Beginning"&gt;9.2&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Granted&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;td id="xdx_98D_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_pid_c20220501__20220731_z8XSpMDYH7a1" style="text-align: right" title="Shares underlying options outstanding, granted"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0787"&gt;&#x2014;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;$&lt;/td&gt;&lt;td id="xdx_98A_eus-gaap--ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_pid_c20220501__20220731_z3vfmFZPhLpf" style="text-align: right" title="Weighted Average Exercise Price, Granted"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0789"&gt;&#x2014;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&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 style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Exercised&lt;/span&gt;&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_982_eus-gaap--StockIssuedDuringPeriodSharesStockOptionsExercised_iN_pid_di_c20220501__20220731_z6nBa1ZZjQjk" style="text-align: right" title="Shares Underlying Options Outstanding, Exercised"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0791"&gt;&#x2014;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"/&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;$&lt;/td&gt;&lt;td id="xdx_98D_eus-gaap--ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_pid_c20220501__20220731_zQ5jD7AZKA45" style="text-align: right" title="Weighted Average Exercise Price, Exercised"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0793"&gt;&#x2014;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="text-align: right"&gt;&#160;&lt;/td&gt;&lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Cancelled/forfeited&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td id="xdx_984_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod_iN_pid_di_c20220501__20220731_z0HuIxu5h9u2" style="border-bottom: Black 1.5pt solid; text-align: right" title="Shares Underlying Options Outstanding, Cancelled/forfeited"&gt;(37&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;)&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;$&lt;/td&gt;&lt;td id="xdx_98E_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice_pid_c20220501__20220731_z0MfMqqrCUr9" style="padding-bottom: 1.5pt; text-align: right" title="Weighted Average Exercise Price, Cancelled/forfeited"&gt;400.00&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: right"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; 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;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Outstanding as of July 31, 2022&lt;/span&gt;&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;&#160;&lt;/td&gt;&lt;td id="xdx_989_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_iE_pid_c20220501__20220731_zJYs99hW4h3g" style="border-bottom: Black 2.5pt double; text-align: right" title="Shares underlying options outstanding, ending"&gt;1,110,319&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;$&lt;/td&gt;&lt;td id="xdx_98C_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_iE_pid_c20220501__20220731_ztWvIYAN0J" style="padding-bottom: 2.5pt; text-align: right" title="Weighted average exercise price, ending balance"&gt;2.33&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: right"&gt;&lt;span id="xdx_906_ecustom--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm_dtY_c20220501__20220731_zkNmZNRXW6Ka" title="Weighted average remaining contractual term (in years), ending"&gt;8.9&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Exercisable as of July 31, 2022&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td id="xdx_983_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_iI_pid_c20220731_zHth9SNAhVIk" style="border-bottom: Black 2.5pt double; text-align: right" title="Shares underlying options outstanding, exercisable at ending"&gt;297,467&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;$&lt;/td&gt;&lt;td id="xdx_98F_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_iI_pid_c20220731_zj9vLRHLH7hf" style="padding-bottom: 2.5pt; text-align: right" title="Weighted average exercise price, exercisable at ending"&gt;4.60&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: right"&gt;&lt;span id="xdx_909_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_dtY_c20220501__20220731_zjsx83VeahO6" title="Weighted average remaining contractual term (in years), exercisable at ending"&gt;7.6&lt;/span&gt;&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:ScheduleOfShareBasedCompensationActivityTableTextBlock>
    <us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber contextRef="AsOf2022-04-30" decimals="INF" unitRef="Shares">1110356</us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber>
    <us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
      contextRef="AsOf2022-04-30"
      decimals="INF"
      unitRef="USDPShares">2.34</us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice>
    <us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2 contextRef="From2022-05-01to2022-07-31">P9Y2M12D</us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2>
    <us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod
      contextRef="From2022-05-01to2022-07-31"
      decimals="INF"
      unitRef="Shares">37</us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod>
    <us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice
      contextRef="From2022-05-01to2022-07-31"
      decimals="INF"
      unitRef="USDPShares">400.00</us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice>
    <us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber contextRef="AsOf2022-07-31" decimals="INF" unitRef="Shares">1110319</us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber>
    <us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
      contextRef="AsOf2022-07-31"
      decimals="INF"
      unitRef="USDPShares">2.33</us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice>
    <OPTT:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm contextRef="From2022-05-01to2022-07-31">P8Y10M24D</OPTT:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm>
    <us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber contextRef="AsOf2022-07-31" decimals="INF" unitRef="Shares">297467</us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber>
    <us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
      contextRef="AsOf2022-07-31"
      decimals="INF"
      unitRef="USDPShares">4.60</us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice>
    <us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1 contextRef="From2022-05-01to2022-07-31">P7Y7M6D</us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1>
    <us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
      contextRef="AsOf2022-07-31_us-gaap_EmployeeStockOptionMember"
      decimals="0"
      unitRef="USD">0</us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue>
    <us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares
      contextRef="AsOf2022-07-31_us-gaap_EmployeeStockOptionMember"
      decimals="INF"
      unitRef="Shares">813000</us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares>
    <us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1 contextRef="From2022-05-012022-07-31_us-gaap_EmployeeStockOptionMember">P9Y4M24D</us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1>
    <us-gaap:AllocatedShareBasedCompensationExpense
      contextRef="From2022-05-012022-07-31_us-gaap_EmployeeStockOptionMember"
      decimals="0"
      unitRef="USD">96000</us-gaap:AllocatedShareBasedCompensationExpense>
    <us-gaap:AllocatedShareBasedCompensationExpense
      contextRef="From2021-05-012021-07-31_us-gaap_EmployeeStockOptionMember"
      decimals="0"
      unitRef="USD">110000</us-gaap:AllocatedShareBasedCompensationExpense>
    <us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
      contextRef="AsOf2022-07-31_custom_NonVestedStockMember"
      decimals="-5"
      unitRef="USD">700000</us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions>
    <us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1 contextRef="From2022-05-012022-07-31_custom_NonVestedStockMember">P2Y3M18D</us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1>
    <us-gaap:ScheduleOfShareBasedCompensationActivityTableTextBlock contextRef="From2022-05-012022-07-31_custom_PerformanceStockOptionsMember">&lt;p id="xdx_89D_eus-gaap--ScheduleOfShareBasedCompensationActivityTableTextBlock_hus-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zX3QvoeujmSl" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;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 style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span id="xdx_8BB_zBu4oBuwBouc" 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="vertical-align: bottom"&gt;
    &lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"&gt;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"&gt;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"&gt;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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="padding-bottom: 1.5pt"&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: 46%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Outstanding as of April 30, 2022&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&#160;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td id="xdx_98A_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_iS_pid_c20220501__20220731__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_z9dd8cYa9wVb" style="width: 14%; text-align: right" title="Shares underlying options outstanding, beginning"&gt;210,122&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="width: 2%"&gt;&#160;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;$&lt;/td&gt;&lt;td id="xdx_988_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_iS_pid_c20220501__20220731__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zlcNMioHQsB9" style="width: 14%; text-align: right" title="Weighted average exercise price, beginning balance"&gt;2.20&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="width: 2%"&gt;&#160;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="width: 14%; text-align: right"&gt;&lt;span id="xdx_90A_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_dtY_c20220501__20220731__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zpqMv7wyx0Hk" title="Weighted Average Remaining Contractual Term (In Years), Beginning"&gt;8.8&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Granted&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;td id="xdx_987_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_pid_c20220501__20220731__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_z6q0StxPMAj7" style="text-align: right" title="Shares underlying options outstanding, granted"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0835"&gt;&#x2014;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;$&lt;/td&gt;&lt;td id="xdx_98B_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_pid_c20220501__20220731__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_z4BHaOnXmyfl" style="text-align: right" title="Shares underlying options outstanding, granted"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0837"&gt;&#x2014;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&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 style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Exercised&lt;/span&gt;&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_985_eus-gaap--StockIssuedDuringPeriodSharesStockOptionsExercised_iN_pid_di_c20220501__20220731__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zR5mwSojMHc7" style="text-align: right" title="Shares Underlying Options Outstanding, Exercised"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0839"&gt;&#x2014;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;$&lt;/td&gt;&lt;td id="xdx_984_eus-gaap--ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_pid_c20220501__20220731__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zGhE28bOSKil" style="text-align: right" title="Weighted Average Exercise Price, Exercised"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0841"&gt;&#x2014;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="text-align: right"&gt;&#160;&lt;/td&gt;&lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Cancelled/forfeited&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td id="xdx_987_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod_iN_pid_di_c20220501__20220731__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zSO09qRx9BE4" style="border-bottom: Black 1.5pt solid; text-align: right" title="Shares Underlying Options Outstanding, Cancelled/forfeited"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0843"&gt;&#x2014;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;$&lt;/td&gt;&lt;td id="xdx_98A_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice_pid_c20220501__20220731__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_z3n7cI6hkUki" style="padding-bottom: 1.5pt; text-align: right" title="Weighted Average Exercise Price, Cancelled/forfeited"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0845"&gt;&#x2014;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: right"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; 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;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Outstanding as of July 31, 2022&lt;/span&gt;&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;&#160;&lt;/td&gt;&lt;td id="xdx_982_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_iE_pid_c20220501__20220731__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zu8fb1O5Ixd8" style="border-bottom: Black 2.5pt double; text-align: right" title="Shares underlying options outstanding, ending"&gt;210,122&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;$&lt;/td&gt;&lt;td id="xdx_982_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_iE_pid_c20220501__20220731__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zoOYJSmdK3vh" style="padding-bottom: 2.5pt; text-align: right" title="Weighted average exercise price, ending balance"&gt;2.20&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: right"&gt;&lt;span id="xdx_90C_ecustom--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm_dtY_c20220501__20220731__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zblURCj3N4Ff" title="Weighted Average Remaining Contractual Term (In Years), Ending"&gt;8.6&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; 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: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Exercisable as of July 31, 2022&lt;/span&gt;&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;&#160;&lt;/td&gt;&lt;td id="xdx_982_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_iI_pid_c20220731__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zD7QwVOzyGjh" style="border-bottom: Black 2.5pt double; text-align: right" title="Shares Underlying Options Outstanding, Exercisable at Ending"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0853"&gt;&#x2014;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;$&lt;/td&gt;&lt;td id="xdx_986_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_iI_pid_c20220731__us-gaap--AwardTypeAxis__custom--PerformanceStockOptionsMember_zvJWpECxI9Ik" style="padding-bottom: 2.5pt; text-align: right" title="Weighted average exercise price, exercisable at ending"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0855"&gt;&#x2014;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: right"&gt;&#160;&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:ScheduleOfShareBasedCompensationActivityTableTextBlock>
    <us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
      contextRef="AsOf2022-04-30_custom_PerformanceStockOptionsMember"
      decimals="INF"
      unitRef="Shares">210122</us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber>
    <us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
      contextRef="AsOf2022-04-30_custom_PerformanceStockOptionsMember"
      decimals="INF"
      unitRef="USDPShares">2.20</us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice>
    <us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2 contextRef="From2022-05-012022-07-31_custom_PerformanceStockOptionsMember">P8Y9M18D</us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2>
    <us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
      contextRef="AsOf2022-07-31_custom_PerformanceStockOptionsMember"
      decimals="INF"
      unitRef="Shares">210122</us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber>
    <us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
      contextRef="AsOf2022-07-31_custom_PerformanceStockOptionsMember"
      decimals="INF"
      unitRef="USDPShares">2.20</us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice>
    <OPTT:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm contextRef="From2022-05-012022-07-31_custom_PerformanceStockOptionsMember">P8Y7M6D</OPTT:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm>
    <us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares
      contextRef="AsOf2022-07-31_us-gaap_PerformanceSharesMember"
      decimals="INF"
      unitRef="Shares">210000</us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares>
    <OPTT:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsUnvestedOutstandingIntrinsicValue
      contextRef="AsOf2022-07-31_us-gaap_PerformanceSharesMember"
      decimals="0"
      unitRef="USD">0</OPTT:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsUnvestedOutstandingIntrinsicValue>
    <us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1 contextRef="From2022-05-012022-07-31_us-gaap_PerformanceSharesMember">P8Y7M6D</us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1>
    <us-gaap:AllocatedShareBasedCompensationExpense
      contextRef="From2022-05-012022-07-31_us-gaap_PerformanceSharesMember"
      decimals="0"
      unitRef="USD">52500</us-gaap:AllocatedShareBasedCompensationExpense>
    <us-gaap:AllocatedShareBasedCompensationExpense
      contextRef="From2021-05-012021-07-31_us-gaap_PerformanceSharesMember"
      decimals="0"
      unitRef="USD">95000</us-gaap:AllocatedShareBasedCompensationExpense>
    <us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
      contextRef="AsOf2022-07-31_us-gaap_PerformanceSharesMember"
      decimals="-5"
      unitRef="USD">100000</us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions>
    <us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1 contextRef="From2022-05-012022-07-31_us-gaap_PerformanceSharesMember">P0Y7M6D</us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1>
    <us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
      contextRef="From2022-05-01to2022-07-31"
      decimals="INF"
      unitRef="Shares">51500</us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod>
    <us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
      contextRef="From2021-05-012021-07-31"
      decimals="INF"
      unitRef="Shares">0</us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod>
    <us-gaap:ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityTableTextBlock contextRef="From2022-05-01to2022-07-31">&lt;p id="xdx_894_eus-gaap--ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityTableTextBlock_zXhzV3QLufq" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;span id="xdx_8BA_zfnAiHlVJ1N8" 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="vertical-align: bottom"&gt;
    &lt;td&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"&gt;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"&gt;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;Average
Price &lt;br/&gt;
per&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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="padding-bottom: 1.5pt"&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: 60%; text-align: left"&gt;Unvested at April 30, 2022&lt;/td&gt;&lt;td style="width: 2%"&gt;&#160;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td id="xdx_988_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_iS_pid_c20220501__20220731__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_z8F9ER2s8fV" style="width: 16%; text-align: right" title="Number of Shares, Unvested, Beginning"&gt;827,764&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="width: 2%"&gt;&#160;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;$&lt;/td&gt;&lt;td id="xdx_981_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_iS_pid_c20220501__20220731__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_zeS3otUL2eO6" style="width: 16%; text-align: right" title="Weighted Average Price per Share, Unvested, Beginning"&gt;1.41&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td&gt;Granted&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;td id="xdx_983_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_pid_c20220501__20220731__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_zXrQarTRni9" style="text-align: right" title="Number of Shares, Unvested, Granted"&gt;51,500&lt;/td&gt;&lt;td style="text-align: left"&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;$&lt;/td&gt;&lt;td id="xdx_984_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_pid_c20220501__20220731__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_zwKiFmztzVO3" style="text-align: right" title="Weighted Average Price per Share, Unvested, Granted"&gt;1.12&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: rgb(204,238,255)"&gt;
    &lt;td&gt;Vested and issued&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_987_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_iN_pid_di_c20220501__20220731__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_zF1erS6FPacd" style="text-align: right" title="Number of Shares, Unvested, Vested and issued"&gt;(16,667&lt;/td&gt;&lt;td style="text-align: left"&gt;)&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;$&lt;/td&gt;&lt;td id="xdx_989_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_pid_c20220501__20220731__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_z0lyVGHJ7yll" style="text-align: right" title="Weighted Average Price per Share, Unvested, Vested"&gt;2.37&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: 1.5pt"&gt;Cancelled/forfeited&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td id="xdx_984_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_iN_pid_di_c20220501__20220731__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_zjXGo2Lej04l" style="border-bottom: Black 1.5pt solid; text-align: right" title="Number of Shares, Unvested, Cancelled/forfeited"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0889"&gt;&#x2014;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: right"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; 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; padding-bottom: 2.5pt"&gt;Unvested at July 31, 2022&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;&#160;&lt;/td&gt;&lt;td id="xdx_981_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_iE_pid_c20220501__20220731__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_zDrOwWfdI1I7" style="border-bottom: Black 2.5pt double; text-align: right" title="Number of Shares, Unvested, Ending"&gt;862,597&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&#160;&lt;/td&gt;
    &lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;$&lt;/td&gt;&lt;td id="xdx_98D_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_iE_pid_c20220501__20220731__us-gaap--AwardTypeAxis__custom--NonVestedRestrictedStockMember_zgHvsBu9eRO5" style="padding-bottom: 2.5pt; text-align: right" title="Weighted Average Price per Share, Unvested, Ending"&gt;1.38&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:ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityTableTextBlock>
    <us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
      contextRef="AsOf2022-04-30_custom_NonVestedRestrictedStockMember"
      decimals="INF"
      unitRef="Shares">827764</us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber>
    <us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
      contextRef="AsOf2022-04-30_custom_NonVestedRestrictedStockMember"
      decimals="INF"
      unitRef="USDPShares">1.41</us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue>
    <us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
      contextRef="From2022-05-012022-07-31_custom_NonVestedRestrictedStockMember"
      decimals="INF"
      unitRef="Shares">51500</us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod>
    <us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
      contextRef="From2022-05-012022-07-31_custom_NonVestedRestrictedStockMember"
      decimals="INF"
      unitRef="USDPShares">1.12</us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue>
    <us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
      contextRef="From2022-05-012022-07-31_custom_NonVestedRestrictedStockMember"
      decimals="INF"
      unitRef="Shares">16667</us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod>
    <us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
      contextRef="From2022-05-012022-07-31_custom_NonVestedRestrictedStockMember"
      decimals="INF"
      unitRef="USDPShares">2.37</us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue>
    <us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
      contextRef="AsOf2022-07-31_custom_NonVestedRestrictedStockMember"
      decimals="INF"
      unitRef="Shares">862597</us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber>
    <us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
      contextRef="AsOf2022-07-31_custom_NonVestedRestrictedStockMember"
      decimals="INF"
      unitRef="USDPShares">1.38</us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue>
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      contextRef="From2022-05-012022-07-31_us-gaap_RestrictedStockMember"
      decimals="0"
      unitRef="USD">184000</us-gaap:AllocatedShareBasedCompensationExpense>
    <us-gaap:AllocatedShareBasedCompensationExpense
      contextRef="From2021-05-012021-07-31_us-gaap_RestrictedStockMember"
      decimals="0"
      unitRef="USD">14000</us-gaap:AllocatedShareBasedCompensationExpense>
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      contextRef="AsOf2022-07-31_us-gaap_RestrictedStockMember"
      decimals="0"
      unitRef="USD">821067</us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions>
    <us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1 contextRef="From2022-05-012022-07-31_us-gaap_RestrictedStockMember">P1Y9M18D</us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1>
    <us-gaap:FairValueDisclosuresTextBlock contextRef="From2022-05-01to2022-07-31">&lt;p id="xdx_807_eus-gaap--FairValueDisclosuresTextBlock_zc7BCZRdtE86" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;(12)
&lt;span id="xdx_82A_z0FbtkvJMJW4"&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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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; width: 0.6in"&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"&gt;&lt;span style="font-family: Times New Roman, Times, 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"&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"&gt;&lt;span style="font-family: Times New Roman, Times, 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"&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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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: 0; text-align: justify"&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 Company&#x2019;s contingent consideration liability represent the only asset or liability classified
financial instrument that is measured at fair value on a recurring basis.&lt;/p&gt;
&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;The
total carrying value of our marketable securities approximates fair value due to the short term nature of these investments. As of
July 31, 2022 and April 30, 2022, the carrying values were $&lt;span id="xdx_909_eus-gaap--InvestmentsFairValueDisclosure_iI_pn5n6_c20220731_zdQsP3Zc3h9l" title="Fair value of investments"&gt;42.7&lt;/span&gt;
million and $&lt;span id="xdx_90F_eus-gaap--InvestmentsFairValueDisclosure_iI_pn5n6_c20220430_zJwlsS6u58G2" title="Fair value of investments"&gt;49.4&lt;/span&gt;
million, respectively.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Additionally,
there is a Level 3 contingent liability related to earnouts as part of the MAR acquisition in the amount of $&lt;span id="xdx_90C_eus-gaap--BusinessCombinationContingentConsiderationLiability_iI_pn5n6_c20220731__us-gaap--FairValueByFairValueHierarchyLevelAxis__us-gaap--FairValueInputsLevel3Member_zKPBnFnp68A6" title="Contingent liability MAR acquisition amount"&gt;1.5&lt;/span&gt; million as the inputs
are currently unobservable to determine this fair value. As of July 31, 2022, the fair value of this contingent liability from
the time that it was acquired has decreased by $&lt;span id="xdx_90B_ecustom--IncreaseDecreaseInContingentLiability_pn5n6_c20220501__20220731__us-gaap--FairValueByFairValueHierarchyLevelAxis__us-gaap--FairValueInputsLevel3Member_zSMQzgVw7xV6" title="Decrease in contingent liability"&gt;0.1&lt;/span&gt; million from $&lt;span id="xdx_907_eus-gaap--ContingentConsiderationClassifiedAsEquityFairValueDisclosure_iI_pn5n6_c20220731__us-gaap--FairValueByFairValueHierarchyLevelAxis__us-gaap--FairValueInputsLevel3Member_z49tClFdyBWe" title="Fair value of contingent consideration"&gt;1.6&lt;/span&gt; million.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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 months ended July 31, 2022 and 2021.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"&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; text-align: center; margin-top: 0pt; margin-bottom: 0pt"&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:FairValueDisclosuresTextBlock>
    <us-gaap:InvestmentsFairValueDisclosure contextRef="AsOf2022-07-31" decimals="-5" unitRef="USD">42700000</us-gaap:InvestmentsFairValueDisclosure>
    <us-gaap:InvestmentsFairValueDisclosure contextRef="AsOf2022-04-30" decimals="-5" unitRef="USD">49400000</us-gaap:InvestmentsFairValueDisclosure>
    <us-gaap:BusinessCombinationContingentConsiderationLiability
      contextRef="AsOf2022-07-31_us-gaap_FairValueInputsLevel3Member"
      decimals="-5"
      unitRef="USD">1500000</us-gaap:BusinessCombinationContingentConsiderationLiability>
    <OPTT:IncreaseDecreaseInContingentLiability
      contextRef="From2022-05-012022-07-31_us-gaap_FairValueInputsLevel3Member"
      decimals="-5"
      unitRef="USD">100000</OPTT:IncreaseDecreaseInContingentLiability>
    <us-gaap:ContingentConsiderationClassifiedAsEquityFairValueDisclosure
      contextRef="AsOf2022-07-31_us-gaap_FairValueInputsLevel3Member"
      decimals="-5"
      unitRef="USD">1600000</us-gaap:ContingentConsiderationClassifiedAsEquityFairValueDisclosure>
    <us-gaap:CommitmentsAndContingenciesDisclosureTextBlock contextRef="From2022-05-01to2022-07-31">&lt;p id="xdx_804_eus-gaap--CommitmentsAndContingenciesDisclosureTextBlock_zJHR4dFHGwg5" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;(13)
&lt;span id="xdx_827_zy6bjfeyxt6f"&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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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 its 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 year ended April 30, 2022,
the Company received notice from the Spanish Central Economic and Administrative Tribunal (&#x201c;Spanish Tax Administration&#x201d;)
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_903_eus-gaap--IncomeTaxExaminationPenaltiesAndInterestAccrued_iI_pp0p0_uEuro_c20210125__us-gaap--IncomeStatementLocationAxis__us-gaap--SellingGeneralAndAdministrativeExpensesMember__us-gaap--IncomeTaxAuthorityNameAxis__us-gaap--TaxAuthoritySpainMember_zBPaAqeNM2f8" title="Income tax penalties"&gt;279,870&lt;/span&gt; or approximately
$&lt;span id="xdx_90B_eus-gaap--IncomeTaxExaminationPenaltiesAndInterestAccrued_iI_pp0p0_c20220731__us-gaap--IncomeStatementLocationAxis__us-gaap--SellingGeneralAndAdministrativeExpensesMember__us-gaap--IncomeTaxAuthorityNameAxis__us-gaap--TaxAuthoritySpainMember_zzsBD0GV26o2" 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_90F_eus-gaap--LossContingencyDamagesPaidValue_pp0p0_uEuro_c20210124__20210125__us-gaap--IncomeTaxAuthorityNameAxis__us-gaap--TaxAuthoritySpainMember_zKtrUPGqHvv7" title="Payment of tax on damages"&gt;279,870&lt;/span&gt;. Notwithstanding that payment, on April
30, 2022, the Company filed its appeal of the decision of the Central Court to the Spanish National Court. The Company expects a ruling
on the appeal prior to the end of fiscal 2023.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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:IncomeTaxExaminationPenaltiesAndInterestAccrued
      contextRef="AsOf2021-01-25_us-gaap_SellingGeneralAndAdministrativeExpensesMember_us-gaap_TaxAuthoritySpainMember"
      decimals="0"
      unitRef="Euro">279870</us-gaap:IncomeTaxExaminationPenaltiesAndInterestAccrued>
    <us-gaap:IncomeTaxExaminationPenaltiesAndInterestAccrued
      contextRef="AsOf2022-07-31_us-gaap_SellingGeneralAndAdministrativeExpensesMember_us-gaap_TaxAuthoritySpainMember"
      decimals="0"
      unitRef="USD">331000</us-gaap:IncomeTaxExaminationPenaltiesAndInterestAccrued>
    <us-gaap:LossContingencyDamagesPaidValue
      contextRef="From2021-01-242021-01-25_us-gaap_TaxAuthoritySpainMember"
      decimals="0"
      unitRef="Euro">279870</us-gaap:LossContingencyDamagesPaidValue>
    <us-gaap:IncomeTaxDisclosureTextBlock contextRef="From2022-05-01to2022-07-31">&lt;p id="xdx_80B_eus-gaap--IncomeTaxDisclosureTextBlock_zyqBPy7S5dYd" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&lt;b&gt;(14)
&lt;span id="xdx_82B_zlYmv30CE0z2"&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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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. The Company is currently undergoing an income tax audit
in Spain for the period from 2011 to 2014, when the Company&#x2019;s Spanish branch was closed. At July 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. 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-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;The
Company does not have any interest or penalties accrued related to uncertain tax positions as it does not have any unrecognized tax benefits.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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; margin-left: 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 New Jersey Economic Development Authority
Tax Transfer program in the amount of approximately $&lt;span id="xdx_902_eus-gaap--OperatingLossCarryforwards_iI_pn5n6_c20210430__us-gaap--IncomeTaxAuthorityNameAxis__us-gaap--NewJerseyDivisionOfTaxationMember_zoBipJCGVqb8" title="Operating loss"&gt;12.0&lt;/span&gt; million for the year ended April 30, 2021, for net proceeds of approximately
$&lt;span id="xdx_90D_ecustom--ProceedFromSaleOfLossCarryforwardsAndTaxCredits_pn5n6_c20210501__20210531_z2IjjvzVOs1b"&gt;1.0 &lt;/span&gt;million which was received in May 2021 and recorded in the Company&#x2019;s Statement of Operations in fiscal year 2022. There was
&lt;span id="xdx_909_eus-gaap--IncomeTaxExpenseBenefit_pn5n6_do_c20220501__20220731__us-gaap--IncomeTaxAuthorityNameAxis__us-gaap--NewJerseyDivisionOfTaxationMember_zrFAg9CVuDCi" title="Income tax benefit"&gt;no&lt;/span&gt; income tax benefit related to the three months ended July 31, 2022.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; margin-left: 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:OperatingLossCarryforwards
      contextRef="AsOf2021-04-30_us-gaap_NewJerseyDivisionOfTaxationMember"
      decimals="-5"
      unitRef="USD">12000000.0</us-gaap:OperatingLossCarryforwards>
    <OPTT:ProceedFromSaleOfLossCarryforwardsAndTaxCredits
      contextRef="From2021-05-012021-05-31"
      decimals="-5"
      unitRef="USD">1000000.0</OPTT:ProceedFromSaleOfLossCarryforwardsAndTaxCredits>
    <us-gaap:IncomeTaxExpenseBenefit
      contextRef="From2022-05-012022-07-31_us-gaap_NewJerseyDivisionOfTaxationMember"
      decimals="-5"
      unitRef="USD">0</us-gaap:IncomeTaxExpenseBenefit>
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&lt;span id="xdx_82C_ze4EJ4aU5QB4"&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-top: 0pt; margin-bottom: 0pt; margin-left: 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-top: 0pt; margin-bottom: 0pt; margin-left: 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_90C_eus-gaap--NumberOfOperatingSegments_pid_dc_uSegment_c20220501__20220731_zosv5LDhP2A4" title="Number of operating segments"&gt;one&lt;/span&gt;
reportable segment as the revenues associated with its different business lines are not material enough to justify segment reporting
or to make it meaningful to investors, and our chief operating decision maker does not view the Company&#x2019;s operations on a
segment basis. The Company operates on a worldwide basis with one operating company in the U.S. and one operating subsidiary in the
UK and one operating subsidiary which was discontinued during 2022 in Australia. Revenues and expenses are generally attributed to
the operating unit that bills the customers. During each of the three months ended July 31, 2022 and 2021, the Company&#x2019;s
primary business operations were in North America.&lt;/span&gt;&lt;/p&gt;

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end
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
